Comparison of gold adsorption by Chlorella vulgaris, rice husk and activated carbon
Comparison of gold adsorption by Chlorella vulgaris, rice husk and activated carbon
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DOI：
10.1016/s0892-6875(02)00064-x
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发表时间：
2002-07-01
影响因子：
4.8
通讯作者：
Kalambaheti, C
中科院分区：
文献类型：
--
作者：
Nakbanpote, W;Thiravetyan, P;Kalambaheti, C
分别从微生物和农业废弃物中筛选出小球藻和稻壳，制备新型金可洗脱吸附剂，用于吸附金-硫脲络合物，并与活性炭进行比较。经加热固定后的杜仲、稻壳和活性炭对金的最大吸附量分别为10.34、28.22和35.88 mg Au/g吸附剂。红外光谱、热力学研究和洗脱实验表明，热固化后的杜仲和稻壳对金的吸附是以配位共价键的化学吸附方式进行的。加热固定化的夏枯草活性官能团为酮、羧酸酯和酯，而加热稻壳的活性官能团为酮、羧酸酯和硅氧烷。活性炭对金的吸附主要是物理吸附。吸附到加热固定的C vulgaris，加热稻壳，和活性炭上的金能够被0.5 M Na 2S 2 O3洗脱至100，87和41%，分别。尽管加热固定的普通C具有最高的洗脱能力，但它吸附的金较少。因此，加热稻壳可作为硫脲富集金的替代吸附剂。(C)2002爱思唯尔科技有限公司版权所有。
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.