College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, PR China.
College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, PR China; Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Zhejiang Sci-Tech University, Ministry of Education, Hangzhou 310018, PR China.
J Hazard Mater. 2015 Apr 9;286:533-44. doi: 10.1016/j.jhazmat.2014.12.034. Epub 2015 Jan 9.
Silica nanotubes (SNTs) with controlled nanotubular structure were synthesized via an electrospinning and calcination process. In this regard, SNTs were found to be ideal adsorbents for Pb(II) removal with a higher adsorption capacity, and surface modification of the SNTs by sym-diphenylcarbazide (SD-SNTs) markedly enhanced the adsorption ability due to the chelating interaction between imino groups and Pb(II). The pH effect, kinetics, isotherms and adsorption mechanism of SNTs and SD-SNTs on Pb(II) adsorption were investigated and discussed detailedly. The adsorption capacity for Pb(II) removal was found to be significantly improved with the decrease of pH value. The Langmuir adsorption model agreed well with the experimental data. As for kinetic study, the adsorption onto SNTs and SD-SNTs could be fitted to pseudo-first-order and pseudo-second-order model, respectively. In addition, the as-prepared SNTs and SD-SNTs also exhibit high adsorption ability for Cd(II) and Co(II). The experimental results demonstrate that the SNTs and SD-SNTs are potential adsorbents and can be used effectively for the treatment of heavy-metal-ions-containing wastewater.
通过静电纺丝和煅烧工艺合成了具有可控纳米管状结构的二氧化硅纳米管（SNTs）。在这方面，SNTs 被发现是去除 Pb(II) 的理想吸附剂，具有更高的吸附容量，并且 SNTs 的表面通过对称二苯卡巴肼（SD-SNTs）进行修饰，由于亚氨基基团和 Pb(II) 之间的螯合相互作用，吸附能力显著增强。详细研究和讨论了 SNTs 和 SD-SNTs 对 Pb(II)吸附的 pH 值影响、动力学、等温线和吸附机理。发现去除 Pb(II) 的吸附容量随 pH 值的降低而显著提高。Langmuir 吸附模型很好地符合实验数据。对于动力学研究，吸附到 SNTs 和 SD-SNTs 上分别可以拟合到拟一级和拟二级模型。此外，所制备的 SNTs 和 SD-SNTs 对 Cd(II) 和 Co(II) 也表现出高吸附能力。实验结果表明，SNTs 和 SD-SNTs 是潜在的吸附剂，可有效用于处理含重金属离子的废水。
