Fabrication of recyclable Fe<sup>3+</sup> chelated aminated polypropylene fiber for efficient clean-up of phosphate wastewater

doi:10.1007/s11705-022-2253-0

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (7) : 840-852 https://doi.org/10.1007/s11705-022-2253-0

RESEARCH ARTICLE

Fabrication of recyclable Fe³⁺ chelated aminated polypropylene fiber for efficient clean-up of phosphate wastewater

Shangyuan Zhao^1,², Fangjia Wang³, Rui Zhou^1,², Peisen Liu^1,², Qizhong Xiong^1,², Weifeng Zhang^1,², Chaochun Zhang^1,², Gang Xu^1,²(

), Xinxin Ye^1,², Hongjian Gao^1,²

¹. Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention; Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
². Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
³. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China

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Abstract

Herein, a Fe³⁺-loaded aminated polypropylene fiber has been reported as an efficient phosphate adsorbent. The remarkable phosphate removal ability of the fiber is due to Fe³⁺ immobilization, and it demonstrates a maximum adsorption capacity of 33.94 mg·P·g^–1. Adsorption experiments showed that the fiber is applicable over a wide pH range from 2 to 9. Furthermore, the adsorption kinetics and isotherm data were consistent with the pseudo-second-order and Langmuir adsorption models, respectively. The adsorption equilibrium of the fiber for phosphate was reached within 60 min, indicating an efficient monolayer chemisorption process. Moreover, the adsorbent maintained prominent phosphate removal in the presence of competitive ions such as NO₃^– and Cl^–, exhibiting high selectivity. More importantly, the fiber demonstrated excellent reusability (5 times) and low adsorption limit below 0.02 mg·P·g^–1. In addition, the phosphate removal efficiency of the fiber can exceed 99% under continuous flow conditions. The adsorption mechanism was studied by X-ray photoelectron spectroscopy, showing that the adsorption of phosphate on the fiber mainly depended on the chemical adsorption of the modified Fe³⁺. Overall, this study proves that the fiber possesses many advantages for phosphate removal, including high adsorption efficiency, lower treatment limit, good recyclability, and environmental friendliness.

Keywords phosphate adsorption aminated polypropylene fiber Fe³⁺ ligand exchange reusability

Corresponding Author(s): Gang Xu

About author:

^* These authors contributed equally to this work.

Online First Date: 17 January 2023 Issue Date: 05 July 2023

Cite this article:

Shangyuan Zhao,Fangjia Wang,Rui Zhou, et al. Fabrication of recyclable Fe³⁺ chelated aminated polypropylene fiber for efficient clean-up of phosphate wastewater[J]. Front. Chem. Sci. Eng., 2023, 17(7): 840-852.

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https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2253-0
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I7/840

Fig.1 SEM images of (a) PPF, (b) PP_AMF, (c) PP_AMAF, (d) PP_AMAF-Fe, and (e) PP_AMAF-Fe-P; the image is magnified 200, 2000, and 20000 times.

Fig.2 FTIR spectra of (a) PPF, (b) PP_AMF, (c) PP_AMAF, (d) PP_AMAF-Fe, and (e) PP_AMAF-Fe-P.

Fig.3 XRD images of (a) PPF, (b) PP_AMF, (c) PP_AMAF, (d) PP_AMAF-Fe, and (e) PP_AMAF-Fe-P.

Fig.4 Effect of pH on phosphate adsorption capacity of PP_AMAF-Fe.

Fig.5 (a) Phosphate adsorption kinetics of PP_AMAF-Fe under different temperatures; (b) linear fitting diagram of first-order model; (c) linear fitting diagram of second-order model; (d) the linear equations of lnK_c and 1/T and the linear equations of lnK₂ and 1/T.

Fig.6 (a) Effect of phosphate concentrations on the phosphate removal capacity of PP_AMAF-Fe; (b) linear fitting of the Langmuir isotherm model of PP_AMAF-Fe for phosphate adsorption.

Fig.7 (a) Phosphate removal ability by PP_AMAF-Fe in competitive ions solution; (b) breakthrough curves of phosphate solutions.

Fig.8 (a) EDS spectra of (I–V) PPF, PP_AMF, PP_AMAF, PP_AMAF-Fe, and PP_AMAF-Fe-P; (b) XPS survey of PPF, PP_AMF, PP_AMAF, PP_AMAF-Fe, and PP_AMAF-Fe-P; (c) high resolution spectrum of Cl 2p for PP_AMAF-Fe; (d) high resolution spectrum of P 2p for PP_AMAF-Fe-P; (e) high resolution Fe 2p spectrum of PP_AMAF-Fe and PP_AMAF-Fe-P; (f) high resolution N 1s spectrum of PP_AMAF-Fe and PP_AMAF-Fe-P.

Tab.1 Different iron modified adsorbents for phosphate removal

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