腐殖酸负载对凹凸棒土吸附Zn(Ⅱ)影响的研究

doi:10.12141/j.issn.1000-565X.210455

华南理工大学学报(自然科学版) ›› 2022, Vol. 50 ›› Issue (4): 110-118.doi: 10.12141/j.issn.1000-565X.210455

所属专题： 2022年化学化工

腐殖酸负载对凹凸棒土吸附Zn(Ⅱ)影响的研究

唐玉婷¹丁思淳²韩承霖³

1．华南理工大学电力学院，广东广州 510640; 2．广东省能源高效清洁利用重点实验室，广东广州 510640

收稿日期:2021-07-16 修回日期:2021-09-11 出版日期:2022-04-25 发布日期:2021-09-24
通信作者: 唐玉婷 (1987-)，女，副教授，博士生导师，主要从事重金属迁移方面的研究 E-mail:tangyuting_ 43@ 163. com
作者简介:唐玉婷 (1987-)，女，副教授，博士生导师，主要从事重金属迁移方面的研究
基金资助:
广州市科技创新发展专项;广东省自然科学基金项目

Study On the Effect Of Humic Acid Loading On The Adsorption Of Zn(Ⅱ) From Aqueous Solution By Palygorskite

TANG Yuting¹ DING Sichun²HAN Chenglin³

1． School of Electric Power，South China University of Technology，Guangzhou 510640，Guangdong，China;
2． Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization，Guangzhou 510640，Guangdong，China

Received:2021-07-16 Revised:2021-09-11 Online:2022-04-25 Published:2021-09-24
Contact: 唐玉婷 (1987-)，女，副教授，博士生导师，主要从事重金属迁移方面的研究 E-mail:tangyuting_ 43@ 163. com
About author:唐玉婷 (1987-)，女，副教授，博士生导师，主要从事重金属迁移方面的研究

摘要/Abstract

摘要： 我国对含锌(Zn)废水的排放有着严格的规定，在高效去除废水中的Zn(Ⅱ)的吸附材料中，凹凸棒土(PAL)被认为是极具应用前景。为验证腐殖酸(HA)对PAL吸附Zn(Ⅱ)的影响，本文采用静态吸附实验，对比腐殖酸/凹凸棒土(HA/PAL)与纯PAL对Zn(Ⅱ)的吸附率，并对PAL和HA/PAL去除水中Zn(Ⅱ)的性能与机理进行了研究。实验结果表明，PAL达到吸附平衡的时间为120 min，温度对吸附过程的影响很小，增加投加量和减少Zn(Ⅱ)的初始浓度使PAL对Zn(Ⅱ)的吸附率增加。HA/PAL在120 min时达到吸附平衡，HA/PAL对Zn(Ⅱ)的吸附过程受温度的影响同样不大，投加量的增加和Zn(Ⅱ)初始浓度的减少提高了HA/PAL对Zn(Ⅱ)的吸附率。PAL对Zn(Ⅱ)的吸附过程符合Langmuir模型，准一级动力学模型能更好地拟合PAL的实验数据。而HA/PAL对Zn(Ⅱ)的吸附过程更符合Freundlich模型，准一级动力学模型同样更好地拟合HA/PAL的实验数据。根据热力学参数，PAL和HA/PAL对Zn(Ⅱ)的吸附过程均为吸热过程。在相同工况下，PAL的吸附率均高于HA/PAL，且所有实验工况对PAL的影响均大于其对HA/PAL的影响。SEM、BET和FTIR的表征结果表明，HA成功负载在了PAL表面，减少了PAL的比表面积。

关键词: Zn(Ⅱ), 腐殖酸, 凹凸棒土, 等温线, 动力学, 热力学

Abstract: There are strict regulations on the discharge of Zn(Ⅱ) wastewater in China. Among adsorptive material that can efficiently remove Zn(Ⅱ) from wastewater, palygorskite (PAL) is considered to be a promising adsorptive material. To verify the effect of humic acid (HA) on the adsorption of Zn(Ⅱ) by PAL, static adsorption experiments were carried out to compare the adsorption rates of Zn(Ⅱ) by humic acid/palygorskite (HA/PAL) and pure PAL, and the performance and mechanism of removing Zn(Ⅱ) from aqueous solution by PAL and HA/PAL were studied. The adsorption equilibrium time of PAL was 120 min, and temperature had little effect on the adsorption process, and the adsorption rate of Zn(Ⅱ) by PAL increased with the increase of the dosage and the decrease of the Zn(Ⅱ) initial concentration. The adsorption equilibrium of HA/PAL was reached at 120 min, and the adsorption process of Zn(Ⅱ) by HA/PAL was also not affected by temperature, and the increase of the dosage and the decrease of the Zn(Ⅱ) initial concentration improved the adsorption rate of Zn(Ⅱ) by HA/PAL. The adsorption process of Zn(Ⅱ) by PAL fitted the Langmuir model, and the pseudo-first-order kinetic model could better fit the experimental data of PAL. However, the adsorption process of Zn(Ⅱ) by HA/PAL was more consistent with Freundlich model, and the pseudo-first-order kinetic model also better fitted the experimental data of HA/PAL. According to thermodynamic parameters, the adsorption of Zn(Ⅱ) by PAL and HA/PAL is endothermic. Under the same conditions, the adsorption rate of Zn(Ⅱ) by PAL is higher than that of Zn(Ⅱ) by HA/PAL, and the influence of all experimental conditions on PAL is greater than that of HA/PAL. The characterization results of SEM, BET and FTIR showed that HA was successfully loaded on PAL surface and reduced PAL specific surface area.

Key words: Zn(Ⅱ), humic acid, palygorskite, isotherm, kinetic, thermodynamic

中图分类号:

O647.33

唐玉婷丁思淳韩承霖. 腐殖酸负载对凹凸棒土吸附Zn(Ⅱ)影响的研究[J]. 华南理工大学学报(自然科学版), 2022, 50(4): 110-118.

TANG Yuting DING Sichun HAN Chenglin. Study On the Effect Of Humic Acid Loading On The Adsorption Of Zn(Ⅱ) From Aqueous Solution By Palygorskite[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(4): 110-118.

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腐殖酸负载对凹凸棒土吸附Zn(Ⅱ)影响的研究

Study On the Effect Of Humic Acid Loading On The Adsorption Of Zn(Ⅱ) From Aqueous Solution By Palygorskite

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