Gemini surfactant-modified activated carbon for remediation of hexavalent chromium from water
Gemini surfactant-modified activated carbon for remediation of hexavalent chromium from water
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DOI：
10.3390/w10010091
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发表时间：
2018-01
期刊：
影响因子：
3.4
通讯作者：
Yingying Zhou;Zhenghua Wang;A. Hursthouse;Bozhi Ren
中科院分区：
文献类型：
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作者：
Yingying Zhou;Zhenghua Wang;A. Hursthouse;Bozhi Ren
Gemini 表面活性剂具有双亲水基团和疏水基团，与类似的单单元分子相比，其表面活性可能高出几个数量级。使用阳离子Gemini表面活性剂（丙基二十二烷基二甲基溴化铵，PDDDAB）和常规阳离子表面活性剂（十二烷基三甲基溴化铵，DTAB）来预处理并生成活性炭。在受控的实验室条件下研究了表面活性剂改性活性炭通过吸附六价铬的去除效率。使用傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）研究表面活性剂改性活性炭的表面变化。还研究了吸附剂用量、pH、离子强度和接触时间等重要参数的影响。与传统的表面活性剂改性活性炭相比，Gemini 表面活性剂改性活性炭对铬（VI）的吸附更加显着。相关系数显示数据最符合 Freundlich 模型，证实了 Gemini 表面活性剂改性活性炭上铬 (VI) 的单层吸附。从这一评估来看，本研究中的表面活性剂改性（尤其是 Gemini 表面活性剂改性）活性炭显示出在处理水污染的实际应用中的前景。
Gemini surfactants, with double hydrophilic and hydrophobic groups, offer potentially orders of magnitude greater surface activity compared to similar single unit molecules. A cationic Gemini surfactant (Propyl didodecyldimethylammonium Bromide, PDDDAB) and a conventional cationic surfactant (Dodecyltrimethylammonium Bromide, DTAB) were used to pre-treat and generate activated carbon. The removal efficiency of the surfactant-modified activated carbon through adsorption of chromium(VI) was investigated under controlled laboratory conditions. Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to investigate the surface changes of surfactant-modified activated carbon. The effect of important parameters such as adsorbent dosage, pH, ionic strength and contact time were also investigated. The chromium(VI) was adsorbed more significantly on the Gemini surfactant-modified activated carbon than on the conventional surfactant-modified activated carbon. The correlation coefficients show the data best fit the Freundlich model, which confirms the monolayer adsorption of chromium(VI) onto Gemini surfactant-modified activated carbon. From this assessment, the surfactant-modified (especially Gemini surfactant-modified) activated carbon in this study showed promise for practical applications to treat water pollution.