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天然麦饭石对腐殖酸的吸附特性研究：表征、动力学、吸附等温线及热力学

Study of Humic Acid Adsorption Character on Natural Maifan Stone: Characterization, Kinetics, Adsorption Isotherm, and Thermodynamics.

作者信息

Yang Hang, Luo Binhua, Zhang Yi, Zhou Boxun, Manzoor Ahmed Sanjrani, Liu Huamin, Liu Xiaowen, He Yong, Xia Shibin

机构信息

School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China.

Equipment Company of Dongfeng Motor Co., Ltd, Shiyan 442000, China.

出版信息

ACS Omega. 2020 Mar 23;5(13):7683-7692. doi: 10.1021/acsomega.0c00622. eCollection 2020 Apr 7.

DOI:10.1021/acsomega.0c00622
PMID:32280912
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7144149/
Abstract

In this paper, the adsorption of humic acid (HA) on natural maifan stone (MS) in aqueous medium was investigated. The changes in MS after adsorption have been characterized explicitly. The adsorption behavior was studied by varying the factors of pH (5-10), reaction time (10-180 min), initial HA concentration (5-50 mg/L), adsorbent dosage (0.1-1.2 g), and temperature (25-45 °C). The kinetics of the adsorption process of HA was fitted well with the pseudo-second-order model ( = 0.99). The isothermal results revealed that the adsorption process is favorable, and highly fitting Langmuir models ( > 0.99) were used. Additionally, the obtained maximum adsorption capacity of MS for HA was approximately 1 mg/g. The adsorption process of HA onto MS was endothermic according to the thermodynamic study. The changes in the excitation-emission-matrix of HA and the X-ray diffraction of MS after adsorption indicate the interaction of HA and MS. However, the reason for these changes is still unclear. Thus, the results show that the natural MS exhibited a certain adsorption capacity for HA. It is promising to develop novel natural MS-based materials for adsorption of HA.

摘要

本文研究了腐殖酸（HA）在水介质中对天然麦饭石（MS）的吸附作用。明确表征了吸附后麦饭石的变化。通过改变pH值（5 - 10）、反应时间（10 - 180分钟）、初始HA浓度（5 - 50毫克/升）、吸附剂用量（0.1 - 1.2克）和温度（25 - 45℃）等因素来研究吸附行为。HA吸附过程的动力学与伪二级模型拟合良好（ = 0.99）。等温吸附结果表明吸附过程是有利的，并采用了高度拟合的朗缪尔模型（ > 0.99）。此外，麦饭石对HA的最大吸附容量约为1毫克/克。根据热力学研究，HA在麦饭石上的吸附过程是吸热的。吸附后HA的激发 - 发射矩阵变化和麦饭石的X射线衍射表明了HA与麦饭石之间的相互作用。然而，这些变化的原因仍不清楚。因此，结果表明天然麦饭石对HA具有一定的吸附能力。开发基于天然麦饭石的新型HA吸附材料具有广阔前景。

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