Cd(Ⅱ)removal from amino acids-bearing wastewater:Critical evaluation and comparison of using magnetic carbon nanotubes ***
作者机构：Department of ChemistryFaculty of ScienceThe Hashemite UniversityP.O.Box 330127Zarqa13133Jordan Faculty of PharmacyThe Hashemite UniversityP.O.Box 330127Zarqa13133Jordan
出 版 物：《Emerging Contaminants》 (新兴污染物（英文）)
年 卷 期：2022年第8卷第1期
页 面：288-298页
学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
主 题：Magnetic adsorption Magnetite Magnetic carbon nanotubes Cadmium Amino acids Water treatment
摘 要：In the present work,two magnetic adsorbents(magnetic carbon nanotunes“MCNTand magnetite“Mag)were tested for cadmium“Cd(Ⅱ)removal from water in the presence of various amino acids“AA(aspartic acid,glutamic acid“Glu,glycine and cysteine).MCNT was prepared by initially oxidizing carbon nanotubes(CNT)by three different methods:nitric acid method,ammonium persulphate method,Hummer s *** was then deposited on the oxidized CNT to produce the corresponding magnetic carbon nanotube adsorbents:NA-MCNT,APS-MCNT,HUM-MCNT,*** of Cd(Ⅱ)on various MCNT was investigated in the presence/absence of AA where various factors were studied:pH,oxidation method of CNT,type of AA,magnetite-to-CNT *** was found that the presence of AA significantly reduced the adsorption capacity of MCNT towards Cd(Ⅱ)at all pHs(reduction occurred from 49.8 mg g^(-1)to 12.5 mg g^(-1)).Contrary adsorption capacity of Cd(Ⅱ)on bare magnetite“Magwas noticeably enhanced in the presence of AA(for Glu,enhancement occurred from 6.9 to 22.3 mg g^(-1)).Due to cheapness of Mag relative to CNT,it was recommended to use Mag rather than MCNT for Cd(Ⅱ)removal from AA-bearing *** that the optimum uptake method was proposed using Mag at pH 8 in the presence of Glu at concentration ratio(1:3 Cd(Ⅱ):Glu).Mag was selective towards Cd(Ⅱ)even in the presence of co-existing *** use of Mag for five cycles decreased adsorption efficiency to 80%which indicated that adsorption system was cost *** water samples gave higher adsorption of Cd(Ⅱ)in the presence of Glu than in distilled *** a conclusion,it was recommended to use Mag rather than MCNT for Cd(Ⅱ)removal in the presence of AA.
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