Rathee Garima, Singh Nidhi, Chandra Ramesh
Drug Discovery & Development Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India.
Dr. B. R. Ambedkar Centre for Biomedical Research, University of Delhi, Delhi 110007, India.
ACS Omega. 2020 Jan 30;5(5):2368-2377. doi: 10.1021/acsomega.9b03785. eCollection 2020 Feb 11.
In this study, a hydrothermal route was used to design a novel NiAlTi layered double hydroxide. The material so-obtained was characterized using various physiochemical techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis for structural analysis, scanning electron microscopy, transmission electron microscopy for morphological analysis, and so on. The material so-obtained was further applied for wastewater remediation and was found to be an efficient, cost-effective, and reusable adsorbent. Organic contaminants such as dyes and antibiotics were used as pollutants to carry out the removal study. NiAlTi LDH was found to be an excellent adsorbent for the removal of anionic dyes and antibiotics. Excellent performance was shown by NiAlTi LDH at a broad pH range from 4 to 10 for anionic dyes (orange II and methyl orange), but tetracycline removal was predominantly maximum at pH = 9. Further, the kinetic studies also revealed that the adsorption process of both organic contaminants obeyed a pseudo-second-order model. In addition, the Langmuir isotherm adsorption model fitted the experimental results for both types of pollutants very well. The attained maximum adsorption capacity was superb for both organic dyes and antibiotics (1250 mg/g for MO, 2000 mg/g for OII, and 238.09 mg/g for TC). NiAlTi LDH was also capable of simultaneous elimination from a mixture of antibiotics and dyes. Further, NiAlTi LDH also showed outstanding stability and reusability, making it one of the most promising materials for large-scale wastewater remediation contaminated by dyes and antibiotics.
在本研究中，采用水热法制备了一种新型的NiAlTi层状双氢氧化物。利用各种物理化学技术对所得材料进行了表征，如用于结构分析的X射线衍射、傅里叶变换红外光谱、热重分析，用于形态分析的扫描电子显微镜、透射电子显微镜等。所得材料进一步应用于废水修复，结果表明它是一种高效、经济且可重复使用的吸附剂。使用染料和抗生素等有机污染物作为污染物进行去除研究。发现NiAlTi层状双氢氧化物是去除阴离子染料和抗生素的优良吸附剂。对于阴离子染料（橙黄II和甲基橙），NiAlTi层状双氢氧化物在4至10的宽pH范围内表现出优异的性能，但四环素的去除在pH = 9时主要达到最大值。此外，动力学研究还表明，两种有机污染物的吸附过程均符合准二级模型。此外，朗缪尔等温吸附模型非常适合两种类型污染物的实验结果。对于有机染料和抗生素，达到的最大吸附容量都非常出色（甲基橙为1250 mg/g，橙黄II为2000 mg/g，四环素为238.09 mg/g）。NiAlTi层状双氢氧化物还能够同时从抗生素和染料的混合物中去除污染物。此外，NiAlTi层状双氢氧化物还表现出出色的稳定性和可重复使用性，使其成为大规模修复受染料和抗生素污染废水最有前景的材料之一。
