使用木质纤维素纳米纤维从水溶液中有效吸附镍和铬(VI):动力学、等温线和热力学研究

IF 1.6 Q3 WATER RESOURCES Water Practice and Technology Pub Date : 2023-04-11 DOI:10.2166/wpt.2023.054
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引用次数: 0

摘要

工业活动导致的重金属进入环境是本世纪的主要问题之一。镍和铬(VI)是各种工业中使用的有毒元素。在本研究中,木质纤维素纳米纤维购自Nano Novin聚合物公司,并用作吸附剂,用于在分批系统中从水溶液中去除镍和铬(VI)离子。研究了pH、初始浓度、吸附剂用量、接触时间和温度对吸附效果的影响。通过Langmuir、Freundlich、动力学和热力学模型确定了吸附机理。镍和铬(VI)的平衡等温线研究表明,该等温线符合Freundlich模型。在动力学研究中,具有较大相关系数的伪二阶模型对实验数据具有较大的拟合度。计算了镍和铬的热力学参数,如吉布斯自由能、焓和熵,分别表明了自发过程、吸热过程和随机过程。木质纤维素纳米纤维可以被认为是一种很好的吸附剂,它能够高度吸附水溶液中的镍和铬(VI)。
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Efficient adsorption of nickel and chromium(VI) from aqueous solutions using lignocellulose nanofibers: kinetics, isotherms, and thermodynamic studies
The entry of heavy metals due to industrial activities into the environment is one of the major problems in this century. Nickel and chromium(VI) are the toxin elements that are used in various industries. In this study, lignocellulose nanofiber was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of nickel and chromium(VI) ions from aqueous solutions in a batch system. The effects of pH, initial concentration, adsorbent dose, contact time, and temperature were investigated. The adsorption mechanism was determined by Langmuir, Freundlich, kinetic, and thermodynamic models. Investigation of equilibrium isotherms nickel and chromium(VI) showed that the isotherm fitted well with the Freundlich model. The pseudo-second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters of both nickel and chromium such as Gibbs free energy, enthalpy, and entropy were calculated which indicated spontaneous, endothermic, and random processes, respectively. Lignocellulose nanofiber can be suggested as a good adsorbent that is highly capable of adsorbing nickel and chromium(VI) from aqueous solutions.
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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