利用剩余茶渣和 SiO@TW 纳米复合材料从水中回收 Pb 和 Cd。
Pb and Cd recovery from water using residual tea waste and SiO@TW nanocomposites.
机构信息
Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology Hisar, 125001, India.
Department of Environmental Sciences, J. C. Bose University of Science and Technology, YMCA, Faridabad, 121006, Haryana, India.
出版信息
Chemosphere. 2020 Oct;257:127277. doi: 10.1016/j.chemosphere.2020.127277. Epub 2020 Jun 3.
This work reports the fabrication of SiO@TW nanocomposites and their application for Pb and Cd ions sequestration from simulated water. Residual tea waste has also been used for metal ions sequestration to compare the potential of SiO@TW nanocomposites. The SEM, TEM, BET, FTIR and EDX techniques were employed for the characterization of SiO@TW nanocomposites and residual tea waste. Particle sizes of SiO@TW nanocomposites was in the range of 6.8-12 nm. The experiments were carried out in batch mode to explore the effect of various operating parameters on the sequestration of Pb and Cd ions from water. The experimental data was subjected to various thermodynamic, kinetic and isothermic models. According to Langmuir model, the maximum adsorption efficiency of the SiO@TW nanocomposites was 153 mg/g for Pb and 222 mg/g for Cd but maximum adsorption efficiency of residual tea waste for Pb was 125 mg/g and for Cd was 142.9 mg/g. This study suggested that due to the presence of active sites SiO@TW nanocomposites has greater potential for metal sequestration than residual tea waste.
本工作报道了 SiO@TW 纳米复合材料的制备及其在模拟水中对 Pb 和 Cd 离子的去除应用。还利用剩余的茶叶废料来进行金属离子的螯合，以比较 SiO@TW 纳米复合材料的潜力。采用 SEM、TEM、BET、FTIR 和 EDX 技术对 SiO@TW 纳米复合材料和剩余的茶叶废料进行了表征。SiO@TW 纳米复合材料的粒径在 6.8-12nm 范围内。实验采用间歇式进行，以探讨各种操作参数对水中 Pb 和 Cd 离子去除的影响。实验数据采用各种热力学、动力学和等温模型进行了分析。根据 Langmuir 模型，SiO@TW 纳米复合材料对 Pb 的最大吸附效率为 153mg/g，对 Cd 的最大吸附效率为 222mg/g，而剩余茶叶废料对 Pb 的最大吸附效率为 125mg/g，对 Cd 的最大吸附效率为 142.9mg/g。本研究表明，由于存在活性位点，SiO@TW 纳米复合材料在金属螯合方面比剩余的茶叶废料具有更大的潜力。
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