Application of Quaternized Activated Carbon Derived from Macadamia Nutshells for the Removal of Hexavalent Chromium from Aqueous Solutions

被引：26
作者：
Pakade, Vusumzi E. [1 ]
Maremeni, Londolani C. [1 ]
Ntuli, Themba D. [1 ]
Tavengwa, Nikita T. [2 ]
机构：
[1] Vaal Univ Technol, Fac Appl & Comp Sci, Dept Chem, Private Bag 10 021, ZA-1900 Vanderbijlpark, South Africa
[2] Univ Witwatersrand, Sch Chem, Inst Mol Sci, Private Bag 3, ZA-2050 Johannesburg, South Africa
来源：
SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE | 2016年 / 69卷
基金：
新加坡国家研究基金会;
关键词：
Activated carbon; amination; Macadamia; chromium(VI); adsorption; reduction; DENSIFIED CELLULOSE; ADSORPTIVE REMOVAL; CR(VI) REMOVAL; ZINC-CHLORIDE; WASTE-WATER; THERMODYNAMICS; OPTIMIZATION; EQUILIBRIUM; KINETICS; VI;
D O I：
10.17159/0379-4350/2016/v69a22
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this paper, the feasibility of quaternized activated carbon derived from Macadamia nutshells was explored in the removal of hexavalent chromium (Cr(VI)) from aqueous solutions. The amino-modified activated carbon was achieved by cross-linking native Macadamia activated carbon (MAC) with epichlorohydrin and grafting diethylenetriamine and triethylamine (EDT) on the surface and the product was labelled as MAC-EDT. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR), Bruemer-Emmett-Teller (BET), scanning electron microscope (SEM) and the CHNS analyzer. The optimum parameters for Cr(VI) removal found were pH(5), contact time (120 min) and sorbent mass (0.10 g) where removal efficiencies were >90% in all cases. Langmuir model fitted the data best and the adsorption capacity was 145.5 mg g(-1) after surface modification with EDT. The Cr(VI) ion was found to be adsorbed more as compared to other anions, and the sorption order was: SO42- < PO43 - approximate to NO3- < Cr2O72. The removal mechanism involved adsorption of Cr(VI) and/or subsequent reduction of Cr(VI) to Cr(III).
引用
收藏
页码：180 / 188
页数：9
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