A novel clay/sludge-based magnetic ceramsite: Preparation and adsorption removal for aqueous Cu(II)

IF 2.3 4区工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY

Separation Science and Technology Pub Date : 2023-04-20 DOI:10.1080/01496395.2023.2203326

Wenguang Li, Yuhuan Sun, Haihan Sun, Shuwu Zhang, Fayuan Wang

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引用次数: 0

Abstract

ABSTRACT Printing and dyeing sludge (PADS) and magnetic clay (MC, clay loaded with Fe3O4) were utilized as raw materials to prepare a novel ceramsite for Cu(II) removal from wastewater. The optimal preparation conditions were calcination temperature = 600°C, magnetic attapulgite (MA) : magnetic bentonite (MB) = 3:1, PADS = 40%, and iron content = 20%. The ceramsite prepared under these conditions (i.e. A600-3-20) had the best removal capacity for aqueous Cu(II). N2 adsorption and desorption isotherm confirmed that A600-3-20 was a porous material, with an average pore size of 14.78 nm and a surface area of 49.943 m2/g. Fe3O4 particles were successfully loaded onto the surface of the ceramsite, with a magnetic saturation intensity of 26.83 emu/g. The removal rate of Cu(II) from 40 mg/L solution by A600-3-20 reached 90%-98% under the optimal adsorption conditions. Adsorption kinetics fitted the pseudo-second-order dynamic model. Adsorption isotherm followed the Langmuir isotherm model, with the maximum adsorption capacity (qm) was 2.40 mg/g. The adsorption mechanisms were mainly dominated by chemisorption, including ion exchange and surface complexation. The magnetic ceramsite had no heavy metal leaching risk and displayed an excellent reusability, indicating its potential as an environment-friendly and low-cost adsorbent for aqueous Cu(II) removal.

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一种新型粘土/污泥基磁性陶粒的制备及其对水中Cu(II)的吸附去除

摘要以印染污泥(PADS)和磁性粘土(MC，黏土负载Fe3O4)为原料，制备了一种新型陶粒，用于去除废水中的Cu(II)。最佳制备条件为:煅烧温度600℃，磁性凹凸棒土(MA):磁性膨润土(MB) = 3:1, PADS = 40%，铁含量为20%。在此条件下制备的陶粒(即A600-3-20)对水中Cu(II)的去除能力最好。N2吸附解吸等温线证实A600-3-20为多孔材料，平均孔径为14.78 nm，比表面积为49.943 m2/g。Fe3O4颗粒成功加载到陶瓷表面，磁饱和强度为26.83 emu/g。在最佳吸附条件下，A600-3-20对40 mg/L溶液中的Cu(II)去除率可达90% ~ 98%。吸附动力学符合准二级动力学模型。吸附等温线符合Langmuir等温线模型，最大吸附量(qm)为2.40 mg/g。吸附机理主要以化学吸附为主，包括离子交换和表面络合。磁性陶粒无重金属浸出风险，且具有良好的可重复使用性，表明其作为一种环境友好、低成本的水中Cu(II)吸附剂的潜力。

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来源期刊

Separation Science and Technology 工程技术-工程：化工

CiteScore

6.10

自引率

3.60%

发文量

131

审稿时长

5.7 months

期刊介绍： This international journal deals with fundamental and applied aspects of separation processes related to a number of fields. A wide range of topics are covered in the journal including adsorption, membranes, extraction, distillation, absorption, centrifugation, crystallization, precipitation, reactive separations, hybrid processes, continuous separations, carbon capture, flocculation and magnetic separations. The journal focuses on state of the art preparative separations and theoretical contributions to the field of separation science. Applications include environmental, energy, water, and biotechnology. The journal does not publish analytical separation papers unless they contain new fundamental contributions to the field of separation science.