包覆TiO2纳米晶的超快染料去除

Jasmine Thomas, T. Harsha, P. Anitha, Nygil Thomas
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引用次数: 1

摘要

采用沉淀法制备了有帽和无帽的锐钛矿相TiO2纳米晶。在沉淀过程中,油酸是有效的封盖剂。采用PXRD、IR和UV对合成的TiO2纳米晶进行了表征。利用Debye - Scherrer方程计算的晶体尺寸表明,制备的材料为纳米级。采用纳米TiO2作为染料吸附剂。结果表明,制备的纳米晶对亚甲基蓝(MB)染料具有优异的染料吸附性能。系统考察了pH、接触时间、染料初始浓度和吸附剂用量对吸附能力的影响。研究发现,纳米晶TiO2在10分钟内可去除95%以上的染料浓度。在初始溶液pH = 10的条件下,包封TiO2的染料吸附量为300 mg g−1。采用Freundlich、Langmuir和dubin - radushkevich - kaganer等温线模型研究了吸附过程。Freundlich等温线模型在所有实验条件下都最适合于平衡吸附。采用准一级、准二级和颗粒内扩散动力学模型分析吸附动力学。结果表明,亚甲基染料的吸附符合准二级动力学。采用沉淀法制备了有帽和无帽的锐钛矿相TiO2纳米晶。在沉淀过程中,油酸是有效的封盖剂。采用PXRD、IR和UV对合成的TiO2纳米晶进行了表征。利用Debye - Scherrer方程计算的晶体尺寸表明,制备的材料为纳米级。采用纳米TiO2作为染料吸附剂。结果表明,制备的纳米晶对亚甲基蓝(MB)染料具有优异的染料吸附性能。系统考察了pH、接触时间、染料初始浓度和吸附剂用量对吸附能力的影响。研究发现,纳米晶TiO2在10分钟内可去除95%以上的染料浓度。在初始溶液pH = 10的条件下,包封TiO2的染料吸附量为300 mg g−1。采用Freundlich、Langmuir和dubin - radushkevich - kaganer等温线模型研究了吸附过程。F……
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ultrafast dye removal using capped TiO2 nanocrystallites
Capped and uncapped TiO2 nanocrystallites of anatase phase were prepared via precipitation method. Oleic acid was used as an effective capping agent during precipitation. The synthesized TiO2 nano crystallites were characterized using PXRD, IR, and UV. The crystallite size calculated using Debye Scherrer equation indicated that the prepared materials are in nano size. Nano crystalline TiO2 was used as a dye adsorbent. It was found that the prepared nanocrystallites have excellent dye adsorption properties towards methylene blue (MB) dye. The effect of pH, contact time, initial dye concentration, and adsorbent dosage on the adsorption capacity was systematically investigated. It was found that nanocrystalline TiO2 could remove more than 95% dye concentration in 10 minutes. The dye adsorption capacity of capped TiO2 has been determined to be 300 mg g−1 at the initial solution pH of 10. Freundlich, Langmuir, and Dubnin-Radushkevich-Kaganer isotherm models were applied to investigate the adsorption process. Freundlich isotherm model shows the best fit to the equilibrium adsorption at all the studied experimental conditions. Adsorption kinetics was analyzed by pseudo-first order, pseudo-second order, and intra-particle diffusion kinetic models. It was found that methylene dye adsorption follows the pseudo second-order kinetics.Capped and uncapped TiO2 nanocrystallites of anatase phase were prepared via precipitation method. Oleic acid was used as an effective capping agent during precipitation. The synthesized TiO2 nano crystallites were characterized using PXRD, IR, and UV. The crystallite size calculated using Debye Scherrer equation indicated that the prepared materials are in nano size. Nano crystalline TiO2 was used as a dye adsorbent. It was found that the prepared nanocrystallites have excellent dye adsorption properties towards methylene blue (MB) dye. The effect of pH, contact time, initial dye concentration, and adsorbent dosage on the adsorption capacity was systematically investigated. It was found that nanocrystalline TiO2 could remove more than 95% dye concentration in 10 minutes. The dye adsorption capacity of capped TiO2 has been determined to be 300 mg g−1 at the initial solution pH of 10. Freundlich, Langmuir, and Dubnin-Radushkevich-Kaganer isotherm models were applied to investigate the adsorption process. F...
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