Comparison of gold adsorption by Chlorella vulgaris, rice husk and activated carbon

被引：39
|
作者：
Nakbanpote, W
Thiravetyan, P
Kalambaheti, C
机构：
[1] King Mongkuts Univ Technol Thonburi, Sch Bioresources & Technol, Bangkok 10140, Thailand
[2] Petr Author Thailand, Inst Res & Dev, Ayudthaya, Thailand
来源：
MINERALS ENGINEERING | 2002年 / 15卷 / 07期
关键词：
biotechnology; mineral processing; recycling; environmental;
D O I：
10.1016/S0892-6875(02)00064-X
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Chlorella vulgaris and rice husk were selected from microorganisms and agricultural waste, respectively, to create new gold-eluteable adsorbents for adsorption of gold-thiourea complex, and compared with activated carbon. The maximum gold adsorption of heated-immobilised C vulgaris, heated rice husk, and activated carbon was 10.34, 28.22 and 35.88 mg Au/g adsorbent, respectively. FTIR spectrum, thermodynamic study and elution tests indicated that heated-immobilised C vulgaris and heated rice husk adsorbed gold by chemical adsorption: co-ordinate covalent bond. The active functional groups of heated-immobilised C vulgaris were ketone, carboxylate and ester, while the groups of heated rice husk were ketone, carboxylate and siloxane. Activated carbon mainly adsorbed gold by physical adsorption. Gold adsorbed onto heated-immobilised C vulgaris, heated rice husk, and activated carbon was able to be eluted by 0.5 M Na2S2O3 to 100, 87 and 41%, respectively. Although heated-immobilised C vulgaris had the highest eluteability, it adsorbed less gold. Therefore, heated rice husk could be used as an alternative adsorbent for gold-thiourea pre-concentration. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：549 / 552
页数：4
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