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    					Enhanced activation of persulfate using mesoporous silica spheres augmented Cu–Al bimetallic oxide particles for bisphenol A degradation  | 
  					 
  					  										
						Fulong Wang, Liang Sun( ), Ziyu Zhang, Fengkai Yang, Jinlong Yang, Weijian Liu( ) | 
					 
															
						| School of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China | 
					 
										
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													     		                            						                            																	    Abstract  Herein, Cu–Al bimetallic oxide was synthesized and mixed with mesoporous silica spheres via a simple hydrothermal method. The prepared sample was then analyzed and employed to activate potassium peroxydisulfate for bisphenol A removal. Based on the results of X-ray diffraction, scanning electron microscopy, and energy dispersion spectroscopy, Cu–Al bimetallic oxide was determined as CuO-Al2O3, and mesoporous silica spheres were found around the these particles. At 30 min, a bisphenol A degradation level of 90% was achieved, and it remained at over 60% after five consecutive cycles, indicating the catalyst’s superior capacity and stability. In terms of removal performance, the radical pathway (including , OH •, and ) and singlet oxygen () played minor roles, while electron migration between bisphenol A, potassium peroxydisulfate, and the catalyst played a dominant role. The introduction of Al2O3 promoted the formation of surface oxygen vacancies, which improved ligand complex formation between potassium peroxydisulfate and the catalyst, thereby facilitating electron migration. Furthermore, mesoporous silica spheres augment not only enhanced bisphenol A adsorption but also alleviated Cu leaching. Overall, this work is expected to provide significant support for the rational development of catalysts with high catalytic activity for persulfate activation via surface electron migration. 
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															| Keywords 
																																																				Cu–Al bimetallic oxides  
																		  																																				mesoporous silica spheres  
																		  																																				peroxydisulfate  
																		  																																				bisphenol A  
																																			  
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																																Corresponding Author(s):
																Liang Sun,Weijian Liu   
																													     		
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																															Just Accepted Date: 26 May 2023  
																																														Online First Date: 11 July 2023   
																																														Issue Date: 07 October 2023
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															| 1 | 
															 
														      V Cleveland, J P Bingham, E Kan. Heterogeneous Fenton degradation of bisphenol A by carbon nanotube-supported Fe3O4. Separation and Purification Technology, 2014, 133: 388–395 
														     														     	 
														     															     		https://doi.org/10.1016/j.seppur.2014.06.061
														     															     															     															 | 
																  
																														
															| 2 | 
															 
														      P J He, Z Zheng, H Zhang, L M Shao, Q Y Tang. PAEs and BPA removal in landfill leachate with Fenton process and its relationship with leachate DOM composition. Science of the Total Environment, 2009, 407(17): 4928–4933 
														     														     	 
														     															     		https://doi.org/10.1016/j.scitotenv.2009.05.036
														     															     															     															 | 
																  
																														
															| 3 | 
															 
														      L Sun, H Jiang, Y X Zhao, X Y Deng, K Shen, Y Li, M G Tian. Implementation of fluidized-bed Fenton as tertiary treatment of nitro-aromatic industrial wastewater. Process Safety and Environmental Protection, 2021, 146: 490–498 
														     														     	 
														     															     		https://doi.org/10.1016/j.psep.2020.11.046
														     															     															     															 | 
																  
																														
															| 4 | 
															 
														      C Calik, D I Cifci. Comparison of kinetics and costs of Fenton and photo-Fenton processes used for the treatment of a textile industry wastewater. Journal of Environmental Management, 2022, 304: 114234 
														     														     	 
														     															     		https://doi.org/10.1016/j.jenvman.2021.114234
														     															     															     															 | 
																  
																														
															| 5 | 
															 
														      L Sun, Y Li, A M Li. Treatment of actual chemical wastewater by a heterogeneous Fenton process using natural pyrite. International Journal of Environmental Research and Public Health, 2015, 12(11): 13762–13778 
														     														     	 
														     															     		https://doi.org/10.3390/ijerph121113762
														     															     															     															 | 
																  
																														
															| 6 | 
															 
														      E J Behrman. Peroxydisulfate chemistry in the environmental literature: a brief critique. Journal of Hazardous Materials, 2019, 365: 971 
														     														     	 
														     															     		https://doi.org/10.1016/j.jhazmat.2018.11.018
														     															     															     															 | 
																  
																														
															| 7 | 
															 
														      L Sun, Z Y Zhang, H Jiang, X X Deng. Facile synthesis of magnetic mesoporous silica spheres for efficient removal of methylene blue via catalytic persulfate activation. Separation and Purification Technology, 2021, 256: 117801 
														     														     	 
														     															     		https://doi.org/10.1016/j.seppur.2020.117801
														     															     															     															 | 
																  
																														
															| 8 | 
															 
														      L Sun, D H Hu, Z Y Zhang, X Y Deng. Oxidative degradation of methylene blue via PDS-based advanced oxidation process using natural pyrite. International Journal of Environmental Research and Public Health, 2019, 16(23): 4773 
														     														     	 
														     															     		https://doi.org/10.3390/ijerph16234773
														     															     															     															 | 
																  
																														
															| 9 | 
															 
														      Y Lv, Z Li, X Zhou, S Cheng, L Zheng. Stabilization of source-separated urine by heat-activated peroxydisulfate. Science of the Total Environment, 2020, 749: 142213 
														     														     	 
														     															     		https://doi.org/10.1016/j.scitotenv.2020.142213
														     															     															     															 | 
																  
																														
															| 10 | 
															 
														      F Lou, Z Qiang, X Zou, J Lv, M Li. Organic pollutant degradation by UV/peroxydisulfate process: impacts of UV light source and phosphate buffer. Chemosphere, 2022, 292: 133387 
														     														     	 
														     															     		https://doi.org/10.1016/j.chemosphere.2021.133387
														     															     															     															 | 
																  
																														
															| 11 | 
															 
														      D A House. Kinetics and mechanism of oxidations by peroxydisulfate. Chemical Reviews, 1962, 62(3): 185–203 
														     														     	 
														     															     		https://doi.org/10.1021/cr60217a001
														     															     															     															 | 
																  
																														
															| 12 | 
															 
														      L Sun, Z Y Zhang, F L Wang, M J Bai, X X Deng, L Y Wang. Activation of persulfate by mesoporous silica spheres-doping CuO for bisphenol A removal. Environmental Research, 2022, 205: 112529 
														     														     	 
														     															     		https://doi.org/10.1016/j.envres.2021.112529
														     															     															     															 | 
																  
																														
															| 13 | 
															 
														      Z Dong, C Jiang, J Yang, X Zhang, W Dai, P Cai. Transformation of iodide by Fe(II) activated peroxydisulfate. Journal of Hazardous Materials, 2019, 373: 519–526 
														     														     	 
														     															     		https://doi.org/10.1016/j.jhazmat.2019.03.063
														     															     															     															 | 
																  
																														
															| 14 | 
															 
														      J Huang, H Zhang. Mn-based catalysts for sulfate radical-based advanced oxidation processes: a review. Environment International, 2019, 133: 105141 
														     														     	 
														     															     		https://doi.org/10.1016/j.envint.2019.105141
														     															     															     															 | 
																  
																														
															| 15 | 
															 
														      J Wang, B Li, Y Li, X Fan, F Zhang, G Zhang, Y Zhu, W Peng. Easily regenerated CuO/γ-Al2O3 for persulfate-based catalytic oxidation: insights into the deactivation and regeneration mechanism. ACS Applied Materials & Interfaces, 2021, 13(2): 2630–2641 
														     														     	 
														     															     		https://doi.org/10.1021/acsami.0c19013
														     															     															     															 | 
																  
																														
															| 16 | 
															 
														      W Peng, J Liu, C Li, F Zong, W Xu, X Zhang, Z Fang. A multipath peroxymonosulfate activation process over supported by magnetic CuO-Fe3O4 nanoparticles for efficient degradation of 4-chlorophenol. Korean Journal of Chemical Engineering, 2018, 35(8): 1662–1672 
														     														     	 
														     															     		https://doi.org/10.1007/s11814-018-0074-0
														     															     															     															 | 
																  
																														
															| 17 | 
															 
														      P Sathishkumar, R Sweena, J J Wu, S Anandan. Synthesis of CuO-ZnO nanophotocatalyst for visible light assisted degradation of a textile dye in aqueous solution. Chemical Engineering Journal, 2011, 171(1): 136–140 
														     														     	 
														     															     		https://doi.org/10.1016/j.cej.2011.03.074
														     															     															     															 | 
																  
																														
															| 18 | 
															 
														      L Sun, H Jiang, Y X Zhao, J Wan, L L Li, L Y Wang, Y Zhang. Facile synthesis of copper-based bimetallic oxides for efficient removal of bisphenol a via Fenton-like degradation. Separation and Purification Technology, 2022, 205: 112529
														     															 | 
																  
																														
															| 19 | 
															 
														      K Kim, D K Yi, U Paik. CuO embedded silica nanoparticles for tungsten oxidation via a heterogeneous Fenton-like reaction. Microelectronic Engineering, 2017, 183: 58–63 
														     														     	 
														     															     		https://doi.org/10.1016/j.mee.2017.10.004
														     															     															     															 | 
																  
																														
															| 20 | 
															 
														      H Song, Z Guan, D Xia, H Xu, F Yang, D Li, X Li. Copper-oxygen synergistic electronic reconstruction on g-C3N4 for efficient non-radical catalysis for peroxydisulfate and peroxymonosulfate. Separation and Purification Technology, 2021, 257: 117957 
														     														     	 
														     															     		https://doi.org/10.1016/j.seppur.2020.117957
														     															     															     															 | 
																  
																														
															| 21 | 
															 
														      G Wang, Y Zhang, L Ge, Z Liu, X Zhu, S Yang, P Jin, X Zeng, X Zhang. Monodispersed CuO nanoparticles supported on mineral substrates for groundwater remediation via a nonradical pathway. Journal of Hazardous Materials, 2022, 429: 128282 
														     														     	 
														     															     		https://doi.org/10.1016/j.jhazmat.2022.128282
														     															     															     															 | 
																  
																														
															| 22 | 
															 
														      R Yin, W Guo, H Wang, J Du, X Zhou, Q Wu, H Zheng, J Chang, N Ren. Selective degradation of sulfonamide antibiotics by peroxymonosulfate alone: direct oxidation and nonradical mechanisms. Chemical Engineering Journal, 2018, 334: 2539–2546 
														     														     	 
														     															     		https://doi.org/10.1016/j.cej.2017.11.174
														     															     															     															 | 
																  
																														
															| 23 | 
															 
														      R Luo, M Li, C Wang, M Zhang, M A N Khan, X Sun, J Shen, W Han, L Wang, J Li. Singlet oxygen-dominated non-radical oxidation process for efficient degradation of bisphenol A under high salinity condition. Water Research, 2019, 148: 416–424 
														     														     	 
														     															     		https://doi.org/10.1016/j.watres.2018.10.087
														     															     															     															 | 
																  
																														
															| 24 | 
															 
														      G Wang, L Ge, Z Liu, X Zhu, S Yang, K Wu, P Jin, X Zeng, X Zhang. Activation of peroxydisulfate by defect-rich CuO nanoparticles supported on layered MgO for organic pollutants degradation: an electron transfer mechanism. Chemical Engineering Journal, 2022, 431: 134026 
														     														     	 
														     															     		https://doi.org/10.1016/j.cej.2021.134026
														     															     															     															 | 
																  
																														
															| 25 | 
															 
														      A Khalida, U H Ikram, M Khan. Gas sensing properties of semiconducting copper oxide nanospheroids. Powder Technology, 2015, 283: 505–511 
														     														     	 
														     															     		https://doi.org/10.1016/j.powtec.2015.06.023
														     															     															     															 | 
																  
																														
															| 26 | 
															 
														      S Xu, H Zhu, W Cao, Z Wen, J Wang, C P François-Xavier, T Wintgens. Cu–Al2O3-g-C3N4 and Cu–Al2O3-C-dots with dual-reaction centres for simultaneous enhancement of Fenton-like catalytic activity and selective H2O2 conversion to hydroxyl radicals. Applied Catalysis B: Environmental, 2018, 234: 223–233 
														     														     	 
														     															     		https://doi.org/10.1016/j.apcatb.2018.04.029
														     															     															     															 | 
																  
																														
															| 27 | 
															 
														      J A Botas, J A Melero, F Martínez, M I Pariente. Assessment of Fe2O3/SiO2 catalysts for the continuous treatment of phenol aqueous solutions in a fixed bed reactor. Catalysis Today, 2010, 149(3–4): 334–340 
														     														     	 
														     															     		https://doi.org/10.1016/j.cattod.2009.06.014
														     															     															     															 | 
																  
																														
															| 28 | 
															 
														      J Zong, Y Zhu, X Yang, C Li. Confined growth of CuO, NiO, and Co3O4 nanocrystals in mesoporous silica (MS) spheres. Journal of Alloys and Compounds, 2011, 509(6): 2970–2975 
														     														     	 
														     															     		https://doi.org/10.1016/j.jallcom.2010.11.175
														     															     															     															 | 
																  
																														
															| 29 | 
															 
														      G P Anipsitakis, D D Dionysiou. Radical generation by the interaction of transition metals with common oxidants. Environmental Science & Technology, 2004, 38(13): 3705–3712 
														     														     	 
														     															     		https://doi.org/10.1021/es035121o
														     															     															     															 | 
																  
																														
															| 30 | 
															 
														     R O C NormanP M StoreyP R West. Electron spin resonance studies. Part XXV. Reactions of the sulphate radical anion with organic compounds. Journal of the Chemical Society B: Physical Organic, 1970, 1087–1095
														     															 | 
																  
																														
															| 31 | 
															 
														      H Cai, X Li, D Ma, Q Feng, D Wang, Z Liu, X Wei, K Chen, H Lin, S Qin, F Lu. Stable Fe3O4 submicrospheres with SiO2 coating for heterogeneous Fenton-like reaction at alkaline condition. Science of the Total Environment, 2021, 764: 144200 
														     														     	 
														     															     		https://doi.org/10.1016/j.scitotenv.2020.144200
														     															     															     															 | 
																  
																														
															| 32 | 
															 
														      J Yan, L Zhu, Z Luo, Y Huang, H Tang, M Chen. Oxidative decomposition of organic pollutants by using persulfate with ferrous hydroxide colloids as efficient heterogeneous activator. Separation and Purification Technology, 2013, 106: 8–14 
														     														     	 
														     															     		https://doi.org/10.1016/j.seppur.2012.12.012
														     															     															     															 | 
																  
																														
															| 33 | 
															 
														      Y Guo, H Liang, L Bai, K Huang, B Xie, D Xu, J Wang, G Li, X Tang. Application of heat-activated peroxydisulfate pre-oxidation for degrading contaminants and mitigating ultrafiltration membrane fouling in the natural surface water treatment. Water Research, 2020, 179: 115905 
														     														     	 
														     															     		https://doi.org/10.1016/j.watres.2020.115905
														     															     															     															 | 
																  
																														
															| 34 | 
															 
														      X Zhang, Y Ding, H Tang, X Han, L Zhu, N Wang. Degradation of bisphenol A by hydrogen peroxide activated with CuFeO2 microparticles as a heterogeneous Fenton-like catalyst: efficiency, stability and mechanism. Chemical Engineering Journal, 2014, 236: 251–262 
														     														     	 
														     															     		https://doi.org/10.1016/j.cej.2013.09.051
														     															     															     															 | 
																  
																														
															| 35 | 
															 
														      Y Liu, R Luo, Y Li, J Qi, C Wang, J Li, X Sun, L Wang. Sandwich-like Co3O4/MXene composite with enhanced catalytic performance for bisphenol A degradation. Chemical Engineering Journal, 2018, 347: 731–740 
														     														     	 
														     															     		https://doi.org/10.1016/j.cej.2018.04.155
														     															     															     															 | 
																  
																														
															| 36 | 
															 
														      X Li, Y Zhang, Y Xie, Y Zeng, P Li, T Xie, Y Wang. Ultrasonic enhanced Fenton-like degradation of bisphenol A using a bio-synthesized schwertmannite catalyst. Journal of Hazardous Materials, 2018, 344: 689–697 
														     														     	 
														     															     		https://doi.org/10.1016/j.jhazmat.2017.11.019
														     															     															     															 | 
																  
																														
															| 37 | 
															 
														      L Lyu, L Zhang, Q Wang, Y Nie, C Hu. Enhanced Fenton catalytic efficiency of γ-Cu–Al2O3 by σ-Cu2+–ligand complexes from aromatic pollutant degradation. Environmental Science & Technology, 2015, 49(14): 8639–8647 
														     														     	 
														     															     		https://doi.org/10.1021/acs.est.5b00445
														     															     															     															 | 
																  
																														
															| 38 | 
															 
														      Y G Bu, H C Li, W J Yu, Y F Pan, L J Li, Y F Wang, L T Pu, J Ding, G D Gao, B C Pan. Peroxydisulfate activation and singlet oxygen generation by oxygen vacancy for degradation of contaminants. Environmental Science & Technology, 2021, 55(3): 2110–2120 
														     														     	 
														     															     		https://doi.org/10.1021/acs.est.0c07274
														     															     															     															 | 
																  
																														
															| 39 | 
															 
														      L J Fu, X Y Li, M Z Liu, H M Yang. Insights into the nature of Cu doping in amorphous mesoporous alumina. Journal of Materials Chemistry A, 2013, 1(46): 14592–14605 
														     														     	 
														     															     		https://doi.org/10.1039/c3ta13273k
														     															     															     															 | 
																  
																														
															| 40 | 
															 
														      Y C Cho, R Y Lin, Y P Lin. Degradation of 2,4-dichlorophenol by CuO-activated peroxydisulfate: importance of surface-bound radicals and reaction kinetics. Science of the Total Environment, 2020, 699: 134379 
														     														     	 
														     															     		https://doi.org/10.1016/j.scitotenv.2019.134379
														     															     															     															 | 
																  
																														
															| 41 | 
															 
														      X Zhou, M K Ke, G X Huang, C Chen, W X Chen, K Liang, Y T Qu, J Yang, Y Wang, F T Li, H Q Yu, Y Wu. Identification of Fenton-like active Cu sites by heteroatom modulation of electronic density. Proceedings of the National Academy of Sciences of the United States of America, 2022, 119(8): e2119492119 
														     														     	 
														     															     		https://doi.org/10.1073/pnas.2119492119
														     															     															     															 | 
																  
																														
															| 42 | 
															 
														      B W Li, L Ma, Q H Wu, L Cheng, S Q Zhao, A Khan, X X Li, A H Xu. Mixed nanocomposites of Cu2O and Mn3O4 to activate peroxydisulfate for efficient degradation of tetracycline via Cu(III) species. ACS Applied Nano Materials, 2023, 6(1): 598–606 
														     														     	 
														     															     		https://doi.org/10.1021/acsanm.2c04724
														     															     															     															 | 
																  
																														
															| 43 | 
															 
														      F E López-Suárez, S Parres-Esclapez, A Bueno-López, M J Illán-Gómez, B Ura, J Trawczynski. Role of surface and lattice copper species in copper-containing (Mg/Sr) TiO3 perovskite catalysts for soot combustion. Applied Catalysis B: Environmental, 2009, 93(1-2): 82–89 
														     														     	 
														     															     		https://doi.org/10.1016/j.apcatb.2009.09.015
														     															     															     															 | 
																  
																														
															| 44 | 
															 
														      X Duan, H Sun, Z Shao, S Wang. Nonradical reactions in environmental remediation processes: uncertainty and challenges. Applied Catalysis B: Environmental, 2018, 224: 973–982 
														     														     	 
														     															     		https://doi.org/10.1016/j.apcatb.2017.11.051
														     															     															     															 | 
																  
																														
															| 45 | 
															 
														      K Y Zhao, X H Wang, T Chen, H Wu, J G Li, B X Yang, D Y Li, J F Wei. Bisphenol A adsorption properties of mesoporous CaSiO3@SiO2 grafted nonwoven polypropylene fiber. Industrial & Engineering Chemistry Research, 2017, 56(9): 2549–2556 
														     														     	 
														     															     		https://doi.org/10.1021/acs.iecr.6b03015
														     															     															     															 | 
																  
																														
															| 46 | 
															 
														      S Bucur, A Diacon, I Mangalagiu, A Mocanu, F Rizea, A Dinescu, A Ghebaur, A C Boscornea, G Voicu, E Rusen. Bisphenol A adsorption on silica particles modified with beta-cyclodextrins. Nanomaterials, 2021, 12(1): 39 
														     														     	 
														     															     		https://doi.org/10.3390/nano12010039
														     															     															     															 | 
																  
																														
															| 47 | 
															 
														      J Ali, K Zhan, H Wang, A Shahzad, Z Zeng, J Wang, X Zhou, H Ullah, Z Chen, Z Chen. Tuning of persulfate activation from a free radical to a nonradical pathway through the incorporation of non-redox magnesium oxide. Environmental Science & Technology, 2020, 54(4): 2476–2488 
														     														     	 
														     															     		https://doi.org/10.1021/acs.est.9b04696
														     															     															     															 | 
																  
																														
															| 48 | 
															 
														      H Wang, W Guo, B Liu, Q Wu, H Luo, Q Zhao, Q Si, F Sseguya, N Ren. Edge-nitrogenated biochar for efficient peroxydisulfate activation: an electron transfer mechanism. Water Research, 2019, 160: 405–414 
														     														     	 
														     															     		https://doi.org/10.1016/j.watres.2019.05.059
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