Adsorption properties of halloysite nanotubes/poly(m-phenylenediamine) composites for Cr(Ⅵ)
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摘要: 为了获得一种去除重金属Cr（Ⅵ）的高性能吸附材料，在原位化学聚合过程中滴加Na2CO3对产物的氧化态进行调节，室温条件下成功制备了埃洛石纳米管/聚间苯二胺（HNTs/PmPD）复合材料。采用SEM、TGA、EDS、Brunauer-Emmett-Teller比表面积分析（BET）、电感耦合等离子体质谱分析（ICP-MS）、FTIR和Zeta电位分析（Zeta）等对HNTs/PmPD复合材料性能和表面结构进行表征。同时，还研究了pH值、时间、初始浓度和温度等实验参数对HNTs/PmPD复合材料的去除Cr（Ⅵ）效果的影响。通过动力学和等温线模型对HNTs/PmPD复合材料吸附Cr（Ⅵ）的实验数据进行了拟合评估。HNTs/PmPD复合材料具有优异的Cr（Ⅵ）去除能力及良好的沉降分离和循环再生性能，室温下的Cr（Ⅵ）吸附容量可达到855.66 mg·g-1以上。研究表明，存在于HNTs/PmPD复合材料表面的大量氨基和亚胺基是去除Cr（Ⅵ）的主要活性位点。HNTs/PmPD复合材料性能优异，在含Cr（Ⅵ）废水治理领域具有广阔的应用前景。Abstract: In order to obtain a high-performance heavy metal Cr(Ⅵ) adsorption material, the halloysite nanotubes/poly(m-phenylenediamine) (HNTs/PmPD) composite was synthesized through in situ chemical polymerization under the regulation of Na2CO3 at room temperature. The surface structure and properties of HNTs/PmPD composite were characterized by SEM, TGA, EDS, Brunauer-Emmett-Teller specific surface area analysis (BET), inductively coupled plasma mass spectrometry (ICP-MS), FTIR and Zeta potential analysis (Zeta). The effects of experimental conditions such as pH value, time, initial concentration and temperature on the removal of Cr(Ⅵ) have been also analyzed. In addition, the experimental data of Cr(Ⅵ) adsorption by HNTs/PmPD composite were fitted and evaluated by kinetic and isotherm models. The HNTs/PmPD composite shows excellent removal ability for Cr(Ⅵ), good sedimentation separation and cycle regeneration performance, moreover, the adsorption capacity can reach above 855.66 mg·g-1 at room temperature. The results show that amino and imine groups presented on the surface of the HNTs/PmPD composite are the main adsorption sites for the removal of Cr(Ⅵ). HNTs/PmPD composite has excellent performance and application prospects in the field of chromium-containing wastewater treatment.
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Keywords:
- halloysite nanotubes /
- poly(m-phenylenediamine) /
- composites /
- Cr(Ⅵ) /
- absorption
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