提出一种安全简单污水处理的方法,以物理共混的方法利用海藻酸钠分散未经任何处理的原始多壁碳纳米管,得到均匀分散的海藻酸钠/碳纳米管(SA/MWNTs)水溶液,以CaCl_2作为凝固浴,制备SA-Ca和SA/MWNTs-Ca复合凝胶球,利用凝胶球对甲基橙(MO)溶液进行吸附脱色研究.试验结果表明:海藻酸钠凝胶球对甲基橙去除率较低,随着碳纳米管含量的增加,当MWNTs增加到2.5g/L,SA/MWNTs-Ca凝胶球的吸附性能提高了3倍;并且随着凝胶球量的增加,去除率迅速增加,当凝胶球质量浓度从1～50g/L时,去除率有显著提高,增加近10倍;溶液pH值对吸附性能的研究还表明,溶液的pH值对SA/MWNTs-Ca凝胶球的吸附性能有较大的影响,pH值较低时有利于SA/MWNTs-Ca凝胶球对MO的吸附.
This study deals with the development of a clean and safe process for water pollution remediation.To follow an 'ecoconception' approach,gel beads containing multil-walled carbon nanotubes (MWNTs) are prepared with a biopolymer extracted from algae,sodium alginate (SA).The use of renewable bioresources of low cost and those disposable in large amount allows the development of a product with a low impact on the environment.In this study,MWNTs are individually dispersed in aqueous solution using SA through noncovalent method,and then the SA-Ca and SA/MWNTs-Ca gel beads are prepared in CaCl_2 solution.Their adsorption capacity is investigated by measuring the removal of methyl orange (MO) of different charges from aqueous solutions.The remove rate of the beads has been compared with that of non-encapsulated MWNTs.The results showed that the remove rate of MO from aqueous solutions using SA-Ca gel beads is very low,and it could be improved sharply with the increasing of the content of MWNTs in SA/MWNTs-Ca gel beads.The amount of SA/MWNTs-Ca gel beads has significant effect on adsorption of MO.Adsorption efficiency in different pH values are also studied,which showed that it has better adsorption at low pH value.
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