1. School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei 230009, China
In this paper, α-MnO2 micronests composed of nanowires were fabricated via a hydrothermal reaction of MnSO4·H2O and K2S2O8 solutions. The α-MnO2 micronests were demonstrated to have a higher adsorption capacity than γ-MnO2 microspheres due to their large specific surface area. The amount of Congo red adsorbed per unit weight of α-MnO2 micronests increased significantly from 114 to 282 mg·g-1 with concentration of Congo red solution increasing from 50 to 200 mg·L-1, but it had a little change with temperature. Kinetics, isotherms and thermodynamics for the adsorption of Congo red on α-MnO2 micronests were examined. The adsorption process followed the pseudo-second-order kinetics with good correlation. The experimental data were analyzed by Langmuir and Freundlich models, and equilibrium data fitted the Langmuir isotherm very well with maximum monolayer adsorption capacity of 625 mg·g–1 at 22 °C. The adsorption was spontaneous and endothermic according to thermodynamic studies. The experimental results indicate that α-MnO2 micronests possess a high adsorption capacity and could be employed as a replacement of traditional sorbents.
. Facile synthesis of α-MnO2 micronests composed of nanowires and their enhanced adsorption to Congo red[J]. Frontiers of Chemical Science and Engineering, 2014, 8(1): 64-72.
Weixin ZHANG, Wenran ZHAO, Zaoyuan ZHOU, Zeheng YANG. Facile synthesis of α-MnO2 micronests composed of nanowires and their enhanced adsorption to Congo red. Front Chem Sci Eng, 2014, 8(1): 64-72.
Shukla A, Zhang Y H, Dubey P, Margrave J L, Shukla S S. The role of sawdust in the removal of unwanted materials from water. Journal of Hazardous Materials , 2002, B95(1-2): 137-152 doi: 10.1016/S0304-3894(02)00089-4
2
Sandy M V, Kurniawan A, Ayucitra A, Sunarso J, Ismadji S. Removal of copper ions from aqueous solution by adsorption using LABORATORIES-modified bentonite (organo-bentonite). Frontiers of Chemical Science and Engineering , 2012, 6(1): 58-66 doi: 10.1007/s11705-011-1160-6
3
Crini G, Peindy H N, Gimbert F, Robert C. Removal of C.I. Basic Green 4 (Malachite Green) from aqueous solutions by adsorption using cyclodextrin-based adsorbent: Kinetic and equilibrium studies. Separation and Purification Technology , 2007, 53(1): 97-110 doi: 10.1016/j.seppur.2006.06.018
4
Malik P K. Use of activated carbons prepared from sawdust and rice-husk for adsorption of acid dyes: A case study of Acid Yellow 36. Dyes and Pigments , 2003, 56(3): 239-249 doi: 10.1016/S0143-7208(02)00159-6
5
Crini G. Non-conventional low-cost adsorbents for dye removal: A review. Bioresource Technology , 2006, 97(9): 1061-1085 doi: 10.1016/j.biortech.2005.05.001
6
Nga N K, Hong P T T, Lam T D, Huy T Q. A facile synthesis of nanostructured magnesium oxide particles for enhanced adsorption performance in reactive blue 19 removal. Journal of Colloid and Interface Science , 2013, 398: 210-216 doi: 10.1016/j.jcis.2013.02.018
7
Jiang Y H, Luo Y Y, Zhang F M, Guo L Q, Ni L. Equilibrium and kinetic studies of C.I. Basic Blue 41 adsorption onto N,F-codoped flower-like TiO2 microspheres. Applied Surface Science , 2013, 273: 448-456 doi: 10.1016/j.apsusc.2013.02.061
8
Konicki W, Sibera D, Mijowska E, Lendzion-Bieluń Z, Narkiewicz U. Lendzion-Bielun’ Z, Narkiewicz U.Equilibrium and kinetic studies on acid dye Acid Red 88 adsorption by magnetic ZnFe2O4 spinel ferrite nanoparticles. Journal of Colloid and Interface Science , 2013, 398: 152-160 doi: 10.1016/j.jcis.2013.02.021
9
Cheng B, Le Y, Cai W Q, Yu J G. Synthesis of hierarchical Ni(OH)2 and NiO nanosheets and their adsorption kinetics and isotherms to Congo red in water. Journal of Hazardous Materials , 2011, 185(2-3): 889-897 doi: 10.1016/j.jhazmat.2010.09.104
10
Wang L X, Li J C, Wang Y Q, Zhao L J, Jiang Q. Adsorption capability for Congo red on nanocrystalline MFe2O4 (M= Mn, Fe, Co, Ni) spinel ferrites. Chemical Engineering Journal , 2012, 181-182: 72-79 doi: 10.1016/j.cej.2011.10.088
11
Ghosh S, Dey K P, Naskar M K. Synthesis of nanofiber-like mesoporous γ-Al2O3 toward its adsorption efficiency for Congo red. Journal of the American Ceramic Society , 2013, 96(1): 28-31 doi: 10.1111/jace.12084
12
Wang L X, Li J C, Wang Y Q, Zhao L J. Preparation of nanocrystalline Fe3-xLaxO4 ferrite and their adsorption capability for Congo red. Journal of Hazardous Materials , 2011, 196: 342-349
13
Zhang Y X, Xu S C, Luo Y Y, Pan S S, Ding H L, Li G H. Synthesis of mesoporous carbon capsules encapsulated with magnetite nanoparticles and their application in wastewater treatment. Journal of Materials Chemistry , 2011, 21(11): 3664-3671 doi: 10.1039/c0jm03727c
14
Wang X H, Ni S B, Zhou G, Sun X L, Yang F, Wang J M, He D Y. Facile synthesis of ultra-long α-MnO2 nanowires and their microwave absorption properties. Materials Letters , 2010, 64(13): 1496-1498 doi: 10.1016/j.matlet.2010.04.002
15
Davranche M, Pourret O, Gruau G, Dia A, Coz-Bouhnik M L. Adsorption of REE(III)-humate complexes onto MnO2: Experimental evidence for cerium anomaly and lanthanide tetrad effect suppression. Geochimica et Cosmochimica Acta , 2005, 69(20): 4825-4835 doi: 10.1016/j.gca.2005.06.005
16
Manning B A, Fendorf S E, Bostick B, Suarez D L. bostick B, Suarez D L. Arsenic(III) oxidation and arsenic(V) adsorption reactions on synthetic birnessite. Environmental Science & Technology , 2002, 36(5): 976-981 doi: 10.1021/es0110170
17
Wang Z M, Lee S W, Catalano J G, Lezama-Pacheco J S, Bargar J R, Tebo B M, Giammar D E. Adsorption of uranium(VI) to manganese oxides: X-ray absorption spectroscopy and surface complexation modeling. Environmental Science & Technology , 2013, 47(2): 850-858 doi: 10.1021/es304454g
18
Kanungo S B, Tripathy S S, Mishra S K, Sahoo B, Rajeev. Rajeev.Adsorption of Co2+, Ni2+, Cu2+, and Zn2+ onto amorphous hydrous manganese dioxide from simple (1-1) electrolyte solutions. Journal of Colloid and Interface Science , 2004, 269(1): 11-21 doi: 10.1016/j.jcis.2003.07.002
19
Fei J B, Cui Y, Yan X H, Qi W, Yang Y, Wang K W, He Q, Li J B. Controlled preparation of MnO2 hierarchical hollow nanostructures and their application in water treatment. Advanced Materials , 2008, 20(3): 452-456 doi: 10.1002/adma.200701231
20
Li J F, Xi B J, Zhu Y C, Li Q W, Yan Y, Qian Y T. A precursor route to synthesize mesoporous γ-MnO2 microcrystals and their applications in lithium battery and water treatment. Journal of Alloys and Compounds , 2011, 509(39): 9542-9548 doi: 10.1016/j.jallcom.2011.07.064
21
Ma H W, Shen J F, Shi M, Yan B, Li N, Ye M X. Facile and template-free preparation of α-MnO2 nanostructures and their enhanced adsorbability. Materials Research Bulletin , 2011, 46(9): 1461-1466 doi: 10.1016/j.materresbull.2011.05.003
22
Lin H Y, Sun Y P, Weng B J, Yang C T, Suen N T, Liao K H, Huang Y C, Ho J Y, Chong N S, Tang H Y. Factors influencing the structure of electrochemically prepared α-MnO2 and γ-MnO2 phases. Electrochimica Acta , 2007, 52(23): 6548-6553 doi: 10.1016/j.electacta.2007.04.095
23
Devaraj S, Munichandraiah N. Effect of crystallographic structure of MnO2 on its electrochemical capacitance properties. Journal of Physical Chemistry C , 2008, 112(11): 4406-4417 doi: 10.1021/jp7108785
24
Brock S L, Duan N, Tian Z R, Giraldo O, Zhou H, Suib S L. A review of porous manganese oxide materials. Chemistry of Materials , 1998, 10(10): 2619-2628 doi: 10.1021/cm980227h
25
Pelekani C, Snoeyink V L. A kinetic and equilibrium study of competitive adsorption between atrazine and Congo red dye on activated carbon: the importance of pore size distribution. Carbon , 2001, 39(1): 25-37 doi: 10.1016/S0008-6223(00)00078-6
26
Sing K S W. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity. International Union of Pure and Applied Chemistry , 1982, 54(11): 2201-2218 doi: 10.1351/pac198254112201
27
Ahmad A A, Hameed B H, Aziz N. Adsorption of direct dye on palm ash: Kinetic and equilibrium modeling. Journal of Hazardous Materials , 2007, 141(1): 70-76 doi: 10.1016/j.jhazmat.2006.06.094
28
Lian L L, Guo L P, Guo C J. Adsorption of Congo red from aqueous solutions onto Ca-bentonite. Journal of Hazardous Materials , 2009, 161(1): 126-131 doi: 10.1016/j.jhazmat.2008.03.063
29
Wong Y C, Szeto Y S, Cheung W H, McKay G. Pseudo-first-order kinetic studies of the sorption of Acid Dyes onto chitosan. Journal of Applied Polymer Science , 2004, 92(3): 1633-1645 doi: 10.1002/app.13714
30
Zhong L S, Hu J S, Liang H P, Cao A M, Song W G, Wan L J. Self-assembled 3D flowerlike iron oxide nanostructures and their application in water treatment. Advanced Materials , 2006, 18(18): 2426-2431 doi: 10.1002/adma.200600504
31
Langmuir I. Adsorption of gases on plain surfaces of glass mica platinum. Journal of the American Chemical Society , 1918, 40(9): 136-403 doi: 10.1021/ja02242a004
32
Nethaji S, Sivasamy A, Mandal A B. Preparation and characterization of corn cob activated carbon coated with nano-sized magnetite particles for the removal of Cr (VI). Bioresource Technology , 2013, 134: 94-100 doi: 10.1016/j.biortech.2013.02.012
33
Ng C, Losso J N, Marshall W E, Rao R M. Freundlich adsorption isotherms of agricultural by-product-based powdered activated carbons in a geosmin-water system. Bioresource Technology , 2002, 85(2): 131-135 doi: 10.1016/S0960-8524(02)00093-7
34
Allen S J, Mckay G, Porter J F. Adsorption isotherm models for basic dye adsorption by peat in single and binary component systems. Journal of Colloid and Interface Science , 2004, 280(2): 322-333 doi: 10.1016/j.jcis.2004.08.078
35
Nigam P, Armour G, Banat I M, Singh D, Marchant R. Physical removal of textile dyes from effluents and solid-state fermentation of dye-adsorbed agricultural residues. Bioresource Technology , 2000, 72(3): 219-226 doi: 10.1016/S0960-8524(99)00123-6
36
Eren E, Afsin B. Investigation of a basic dye adsorption from aqueous solution onto raw and pre-treated bentonite surfaces. Dyes and Pigments , 2008, 76(1): 220-225 doi: 10.1016/j.dyepig.2006.08.019
