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Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres
Hua, Chao1,2; Zhang, Runhu3; Bai, Fang1,2; Lu, Ping1,2; Liang, Xiangfeng1

In this study, quaternized chitosan microspheres (QCMS) were prepared and its Cr (VI) removal potential was investigated. Batch experiments were conducted to examine kinetics, adsorption isotherm, pH effect, and thermodynamic parameters. Equilibrium was attained within 50 min and maximum removal of 97.34% was achieved under the optimum conditions at pH 5. Adsorption data for Cr (VI) uptake by the QCMS were analyzed according to Langmuir, Freundlich, and Temkin adsorption models. The maximum uptake of Cr (VI) was 39.1 mg.g(-1). Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K, 313 K and 323 K. (Delta H degrees = 16.08 kJ.mol(-1); Delta G degrees = -5.84 to -8.08 kJ.mol(-1) and Delta S degrees = 74.81 J.K-1.mol(-1)). So the positive values of both Delta H degrees and Delta S degrees suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption. Delta G degrees values obtainedwere negative indicating a spontaneous adsorption process. The kinetic processwas described by a pseudo-second-order rate equation very well. The results of the present study indicated that the QCMS could be considered as a potential adsorbent for Cr (VI) in aqueous solutions. (C) 2016 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.

KeywordChromium (Vi) Adsorption Quaternized Chitosan Microspheres Isotherms Thermodynamics
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS KeywordHexavalent Chromium ; Activated Carbon ; Waste-water ; Adsorption ; Kinetics ; Ions ; Equilibrium ; Sorption
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Key Basic Research Development Plan(2013CB632602) ; National Natural Science Foundation of China(21306198)
WOS IDWOS:000397964300004
Citation statistics
Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Hebei Collaborat Innovat Ctr Modern Marine Chem T, Tianjin 300130, Peoples R China
3.Kunming Met Coll, Dept Chem Engn, Kunming 650033, Peoples R China
Recommended Citation
GB/T 7714
Hua, Chao,Zhang, Runhu,Bai, Fang,et al. Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres[J]. CHINESE JOURNAL OF CHEMICAL ENGINEERING,2017,25(2):153-158.
APA Hua, Chao,Zhang, Runhu,Bai, Fang,Lu, Ping,&Liang, Xiangfeng.(2017).Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres.CHINESE JOURNAL OF CHEMICAL ENGINEERING,25(2),153-158.
MLA Hua, Chao,et al."Removal of chromium (VI) from aqueous solutions using quaternized chitosan microspheres".CHINESE JOURNAL OF CHEMICAL ENGINEERING 25.2(2017):153-158.
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