使用金属有机框架-氧化石墨烯纳米复合材料从水溶液中去除砷（III）

Removal of Arsenic(III) from Aqueous Solution Using Metal Organic Framework-Graphene Oxide Nanocomposite.

作者信息

Chowdhury Tonoy, Zhang Lei, Zhang Junqing, Aggarwal Srijan

机构信息

Department of Mechanical Engineering, P.O. Box 755905, University of Alaska Fairbanks, Fairbanks, AK 99775, USA.

Department of Civil & Environmental Engineering, P.O. Box 755900, University of Alaska Fairbanks, Fairbanks, AK 99775, USA.

出版信息

Nanomaterials (Basel). 2018 Dec 16;8(12):1062. doi: 10.3390/nano8121062.

MIL-53(Al)-graphene oxide (GO) nanocomposites of different GO to MIL-53(Al) mass ratios (1% to 25% GO) were synthesized and tested for removal of arsenite (As(III)), which is a well-known groundwater contaminant. The properties of MIL-53(Al)-GO nanocomposites were characterized using X-ray Diffraction (XRD), Fourier Transform Infrared (FT-IR) Spectroscopy, Brunauer-Emmett-Teller (BET) surface area measurements, and Scanning Electron Microscopy (SEM). Batch experiments were performed on MIL-53(Al)-GO nanocomposites for As(III) adsorption in aqueous solutions to investigate adsorption kinetics and isotherm behavior under varying environmental conditions. The effects of solution pH (2 to 11), initial As(III) concentrations (10⁻110 mg/L), adsorbent dosage (0.2⁻3.0 g/L), and temperature (298⁻318 K) on As(III) adsorption were investigated. MIL-53(Al)-GO nanocomposites showed higher adsorption of As(III) than pristine MIL-53(Al) and GO individually. As (III) removal was optimized at a ratio of 3% GO in the MIL-53(Al)-GO nanocomposite, with an adsorption capacity of 65 mg/g. The adsorption kinetics and isotherms followed pseudo-second-order and Langmuir isotherm models, respectively. Overall, these results suggest that MIL-53(Al)-GO nanocomposite holds a significant promise for use in the remediation of As (III) from groundwater and other aqueous solutions.

合成了不同氧化石墨烯（GO）与MIL-53（Al）质量比（1%至25% GO）的MIL-53（Al）-氧化石墨烯（GO）纳米复合材料，并测试了其对亚砷酸盐（As(III)）的去除效果，亚砷酸盐是一种众所周知的地下水污染物。使用X射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱、布鲁诺尔-埃米特-特勒（BET）表面积测量和扫描电子显微镜（SEM）对MIL-53（Al）-GO纳米复合材料的性能进行了表征。对MIL-53（Al）-GO纳米复合材料进行了批量实验，以研究其在水溶液中对As(III)的吸附动力学和等温线行为，考察了溶液pH值（2至11）、初始As(III)浓度（10⁻110 mg/L）、吸附剂用量（0.2⁻3.0 g/L）和温度（298⁻318 K）对As(III)吸附的影响。MIL-53（Al）-GO纳米复合材料对As(III)的吸附量高于单独的原始MIL-53（Al）和GO。在MIL-53（Al）-GO纳米复合材料中，当GO的比例为3%时，As(III)的去除效果最佳，吸附容量为65 mg/g。吸附动力学和等温线分别遵循准二级和朗缪尔等温线模型。总体而言，这些结果表明，MIL-53（Al）-GO纳米复合材料在从地下水和其他水溶液中修复As(III)方面具有巨大的应用前景。