Qureshi Muhammad I, Patel Faheemuddin, Al-Baghli Nadhir, Abussaud Basim, Tawabini Bassam S, Laoui Tahar
Department of Chemical Engineering, KFUPM, Dhahran 31261, Saudi Arabia.
Department of Mechanical Engineering, KFUPM, Dhahran 31261, Saudi Arabia.
Bioinorg Chem Appl. 2017;2017:1624243. doi: 10.1155/2017/1624243. Epub 2017 Apr 10.
The present study reports the use of raw, iron oxide, and aluminum oxide impregnated carbon nanotubes (CNTs) for the adsorption of hexavalent chromium (Cr(VI)) ions from aqueous solution. The raw CNTs were impregnated with 1% and 10% loadings (weight %) of iron oxide and aluminum oxide nanoparticles using wet impregnation technique. The synthesized materials were characterized using scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Batch adsorption experiments were performed to assess the removal efficiency of Cr(VI) ions from water and the effects of pH, contact time, adsorbent dosage, and initial concentration of the Cr(VI) ions were investigated. Results of the study revealed that impregnated CNTs achieved significant increase in the removal efficiency of Cr(VI) ions compared to raw CNTs. In fact, both CNTs impregnated with 10% loading of iron and aluminum oxides were able to remove up to 100% of Cr(VI) ions from aqueous solution. Isotherm studies were carried out using Langmuir and Freundlich isotherm models. Adsorption kinetics of Cr(VI) ions from water was found to be well described by the pseudo-second-order model. The results suggest that metallic oxide impregnated CNTs have very good potential application in the removal of Cr(VI) ions from water resulting in better environmental protection.
本研究报告了使用未处理的、负载氧化铁和氧化铝的碳纳米管（CNT）从水溶液中吸附六价铬（Cr(VI)）离子的情况。采用湿浸渍技术，将未处理的碳纳米管用1%和10%负载量（重量%）的氧化铁和氧化铝纳米颗粒进行浸渍。使用扫描电子显微镜（SEM）和热重分析（TGA）对合成材料进行表征。进行了批量吸附实验，以评估从水中去除Cr(VI)离子的效率，并研究了pH值、接触时间、吸附剂用量和Cr(VI)离子初始浓度的影响。研究结果表明，与未处理的碳纳米管相比，负载型碳纳米管对Cr(VI)离子的去除效率有显著提高。事实上，负载10%铁和氧化铝的两种碳纳米管都能够从水溶液中去除高达100%的Cr(VI)离子。使用朗缪尔等温线模型和弗伦德利希等温线模型进行了等温线研究。发现水中Cr(VI)离子的吸附动力学可以用准二级模型很好地描述。结果表明，负载金属氧化物的碳纳米管在从水中去除Cr(VI)离子方面具有很好的潜在应用前景，从而能更好地保护环境。
