碳纳米管添加方式对壳聚糖水凝胶核壳珠制备及其对刚果红水溶液吸附性能的影响。
Effect of the addition mode of carbon nanotubes for the production of chitosan hydrogel core-shell beads on adsorption of Congo red from aqueous solution.
机构信息
Department of Chemical Engineering, Hanbat National University, San 16-1, Deokmyeong-Dong, Yuseong-Gu, Daejeon 305-719, Republic of Korea.
出版信息
Bioresour Technol. 2011 Mar;102(6):4402-9. doi: 10.1016/j.biortech.2010.12.117. Epub 2011 Jan 8.
The adsorption performance of chitosan (CS) hydrogel beads (CSBs) generated by sodium dodecyl sulfate (SDS) gelation with multi-walled carbon nanotube (CNT) impregnation was investigated for Congo red removal as a model anionic dye. CNT-impregnated CSBs were prepared by four different strategies for dispersing CNTs: (a) in CS solution (CSBN1), (b) in SDS solution (CSBN2), (c) in CS solution containing cetyltrimethylammonium bromide (CTAB) (CSBN3), and (d) in SDS solution for gelation with CTAB-containing CS solution (CSBN4). It was observed from FE-SEM study that depending on nature of CNT dispersion, CNTs were found on the outer surface of CSBN2 and CSBN4 only. The adsorption capacity of the CSBs varied with the strategy used for CNT impregnation, and CSBN4 exhibited the highest maximum adsorption capacity (375.94 mg/g) from the Sips model. The lowest Sips maximum adsorption capacity by CSBN3 (121.07 mg/g) suggested significant blocking of binding sites of CS by CNT impregnation.
用十二烷基硫酸钠（SDS）凝胶化和多壁碳纳米管（CNT）浸渍生成壳聚糖（CS）水凝胶珠（CSB）的吸附性能，以刚果红去除为模型阴离子染料进行了研究。通过四种不同的策略将 CNT 浸渍到 CNT 浸渍的 CSB 中：（a）在 CS 溶液中（CSBN1），（b）在 SDS 溶液中（CSBN2），（c）在含有十六烷基三甲基溴化铵（CTAB）的 CS 溶液中（CSBN3），以及（d）在含有 CTAB 的 CS 溶液中用于凝胶化的 SDS 溶液中（CSBN4）。从 FE-SEM 研究中可以看出，根据 CNT 分散的性质，只有在 CSBN2 和 CSBN4 的外表面上才发现 CNT。CSB 的吸附能力随 CNT 浸渍策略的不同而变化，CSBN4 从 Sips 模型中表现出最高的最大吸附能力（375.94 mg/g）。CSBN3 的最低 Sips 最大吸附能力（121.07 mg/g）表明 CNT 浸渍显著阻碍了 CS 的结合位点。
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