Enhanced adsorption of Fe(II) from synthetic wastewater using modified bentonite: Isotherms, kinetics, thermodynamics, and adsorption mechanisms

IF 4.8 3区 材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2024-12-11 DOI:10.1016/j.micromeso.2024.113451
Davron Abdikodirovich Khandamov , Tonni Agustiono Kurniawan , Akbarbek Shukhratovich Bekmirzayev , Fatima Batool , Dilnoza Khandamova , Shavkat Nurullayev , Sevara Kholikova , Zebo Babakhanova , Md Munir Hayet Khan
{"title":"Enhanced adsorption of Fe(II) from synthetic wastewater using modified bentonite: Isotherms, kinetics, thermodynamics, and adsorption mechanisms","authors":"Davron Abdikodirovich Khandamov ,&nbsp;Tonni Agustiono Kurniawan ,&nbsp;Akbarbek Shukhratovich Bekmirzayev ,&nbsp;Fatima Batool ,&nbsp;Dilnoza Khandamova ,&nbsp;Shavkat Nurullayev ,&nbsp;Sevara Kholikova ,&nbsp;Zebo Babakhanova ,&nbsp;Md Munir Hayet Khan","doi":"10.1016/j.micromeso.2024.113451","DOIUrl":null,"url":null,"abstract":"<div><div>The introduction of Fe<sup>2</sup>⁺ ions into water systems poses significant environmental risks globally. This study investigates the adsorption efficiency of bentonite from the Kongyrtog deposit in Uzbekistan and its modified forms for Fe<sup>2</sup>⁺ removal from contaminated water. Batch adsorption experiments were conducted with Fe<sup>2</sup>⁺ concentrations of 2.0–20 mg/L, at pH 7.0, an adsorbent dose of 1 g/L, and temperatures between 288 and 308 K. The bentonites were named MED (modified with ethylenediammoniumdihydrochloride) and MGD (modified with hexamethylenediammonium dihydrochloride), while NKB refers to natural bentonite. Multiple linear regression (MLR) modeling validated the adsorption process, with high <em>R</em><sup>2</sup> correlation coefficients supporting the Langmuir model. Optimal adsorption conditions included a dose of 1 g/L, pH 5.2, a contact time of 40 min, and a temperature of 308 K, with the adsorption kinetics fitting a pseudo-second-order model. Using the Langmuir isotherm model, the maximum adsorption capacities (<u>q</u><sub><em>max</em></sub>) were determined as 8.47 mg/g for NKB, 8.51 mg/g for MGD, and 10.84 mg/g for MED. Among the modified bentonites, Fe<sup>2</sup>⁺ adsorption followed the activity sequence MED &gt; MGD &gt; NKB, with intraparticle diffusion modeling suggesting a two-stage adsorption process. The negative Gibbs free energy values (ΔG°) confirmed the process was spontaneous and endothermic. These modified bentonites offer a cost-effective alternative to activated carbon with the ability to regenerate up to four times. Initial regeneration efficiencies were 78 % for NKB, 83 % for MGD, and 86 % for MED. This study demonstrates the potential of modified bentonites as sustainable adsorbents for Fe<sup>2</sup>⁺ removal, contributing to advancements in eco-friendly water treatment technologies.</div></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":"384 ","pages":"Article 113451"},"PeriodicalIF":4.8000,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous and Mesoporous Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387181124004736","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0

Abstract

The introduction of Fe2⁺ ions into water systems poses significant environmental risks globally. This study investigates the adsorption efficiency of bentonite from the Kongyrtog deposit in Uzbekistan and its modified forms for Fe2⁺ removal from contaminated water. Batch adsorption experiments were conducted with Fe2⁺ concentrations of 2.0–20 mg/L, at pH 7.0, an adsorbent dose of 1 g/L, and temperatures between 288 and 308 K. The bentonites were named MED (modified with ethylenediammoniumdihydrochloride) and MGD (modified with hexamethylenediammonium dihydrochloride), while NKB refers to natural bentonite. Multiple linear regression (MLR) modeling validated the adsorption process, with high R2 correlation coefficients supporting the Langmuir model. Optimal adsorption conditions included a dose of 1 g/L, pH 5.2, a contact time of 40 min, and a temperature of 308 K, with the adsorption kinetics fitting a pseudo-second-order model. Using the Langmuir isotherm model, the maximum adsorption capacities (qmax) were determined as 8.47 mg/g for NKB, 8.51 mg/g for MGD, and 10.84 mg/g for MED. Among the modified bentonites, Fe2⁺ adsorption followed the activity sequence MED > MGD > NKB, with intraparticle diffusion modeling suggesting a two-stage adsorption process. The negative Gibbs free energy values (ΔG°) confirmed the process was spontaneous and endothermic. These modified bentonites offer a cost-effective alternative to activated carbon with the ability to regenerate up to four times. Initial regeneration efficiencies were 78 % for NKB, 83 % for MGD, and 86 % for MED. This study demonstrates the potential of modified bentonites as sustainable adsorbents for Fe2⁺ removal, contributing to advancements in eco-friendly water treatment technologies.

Abstract Image

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
求助全文
约1分钟内获得全文 去求助
来源期刊
Microporous and Mesoporous Materials
Microporous and Mesoporous Materials 化学-材料科学:综合
CiteScore
10.70
自引率
5.80%
发文量
649
审稿时长
26 days
期刊介绍: Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.
期刊最新文献
Editorial Board Adsorption behavior of low-concentration nitrous oxide on natural mordenite zeolite One-step synthesis of aluminum dross-derived MIL-53(Al) as an aniline adsorbent New insights into the fluorine-alkali treatment and its application to ZSM-11 as a superior catalyst for chloromethane to propylene Effect of surfactant-induced porosity and acidity modification of MOF-808 catalyst on the glycerol acetylation reaction
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1