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基于粘土和纤维素的混合碳质吸附剂用于从水溶液中回收镉。

Hybrid carbonaceous adsorbents based on clay and cellulose for cadmium recovery from aqueous solution.

作者信息

Azaryouh Leila, Abara Hajar, Kassab Zineb, Ablouh El-Houssaine, Aboulkas Adil, El Achaby Mounir, Draoui Khalid

机构信息

Materials Science, Energy, and Nano-Engineering (MSN) Department, Mohammed VI Polytechnic University (UM6P) Lot 660 - Hay Moulay Rachid, Benguerir 43150 Morocco

Equipe des Procédés Chimiques et Matériaux Appliqués (EPCMA), Faculté Polydisciplinaire de Béni-Mellal, Université Sultan Moulay Slimane BP 592 23000 Béni-Mellal Morocco.

出版信息

RSC Adv. 2023 Feb 28;13(10):6954-6965. doi: 10.1039/d2ra08287j. eCollection 2023 Feb 21.

DOI:10.1039/d2ra08287j
PMID:36865580
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9973418/
Abstract

The current work describes the synthesis of carbonaceous composites pyrolysis, based on CMF, extracted from Alfa fibers, and Moroccan clay ghassoul (Gh), for potential use in heavy metal removal from wastewater. Following synthesis, the carbonaceous ghassoul (ca-Gh) material was characterized using X-ray fluorescence (XRF), Scanning Electron Microscopy coupled with Energy Dispersive X-ray (SEM-EDX), zeta-potential and Brunauer-Emmett-Teller (BET). The material was then used as an adsorbent for the removal of cadmium (Cd) from aqueous solutions. Studies were conducted into the effect of adsorbent dosage, kinetic time, initial concentration of Cd, temperature and also pH effect. Thermodynamic and kinetic tests demonstrated that the adsorption equilibrium was attained within 60 min allowing the determination of the adsorption capacity of the studied materials. The investigation of the adsorption kinetics also reveals that all the data could be fit by the pseudo-second-order model. The Langmuir isotherm model might fully describe the adsorption isotherms. The experimental maximum adsorption capacity was found to be 20.6 mg g and 261.9 mg g for Gh and ca-Gh, respectively. The thermodynamic parameters show that the adsorption of Cd onto the investigated material is spontaneous and endothermic.

摘要

当前工作描述了基于从阿尔法纤维中提取的椰壳纤维（CMF）和摩洛哥黏土高岭土（Gh）通过热解合成含碳复合材料，用于从废水中去除重金属的潜在应用。合成后，使用X射线荧光光谱（XRF）、扫描电子显微镜结合能谱仪（SEM-EDX）、zeta电位和布鲁诺尔-埃米特-泰勒（BET）对含碳高岭土（ca-Gh）材料进行了表征。然后将该材料用作吸附剂，用于从水溶液中去除镉（Cd）。研究了吸附剂用量、动力学时间、Cd的初始浓度、温度以及pH值的影响。热力学和动力学测试表明，在60分钟内达到吸附平衡，从而可以确定所研究材料的吸附容量。对吸附动力学的研究还表明，所有数据都可以用准二级模型拟合。朗缪尔等温线模型可以充分描述吸附等温线。实验发现，Gh和ca-Gh的最大吸附容量分别为20.6 mg/g和261.9 mg/g。热力学参数表明，Cd在所研究材料上的吸附是自发的且吸热的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d1e3/9973418/6ea6d64dda4c/d2ra08287j-f8.jpg
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