模板法制备空心氧化镁纳米吸附剂及其吸附机理研究

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-10-05 DOI:10.1016/j.surfcoat.2024.131436

Shangxiao Liu , Zhenxue Liu , Junkai Zhao , Xiaoxuan Wei

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引用次数: 0

摘要

近年来，含染料废水的处理一直备受关注。本文以实验室废脱脂棉为生物模板，通过温和的微波溶剂热法成功合成了氧化镁空心管状纳米吸附剂。在吸附实验中，采用响应面方法和Box-Behnken设计对Mg(OAc)2的最佳浓度（0.4 mol/L）、脱脂棉模板质量（0.4 g）和刚果红的最佳煅烧温度（600 ℃）进行了优化和确定。从热力学和动力学角度对吸附过程进行了综合分析。结果表明，MgO-脲模板（MgO-UT）中空纳米吸附剂的吸附过程符合离子交换吸附过程的杜宾-拉杜什基维奇方程，并遵循伪二阶动力学模型。MgO-UT 中空纳米吸附剂对刚果红的最大吸附量为 3511.35 mg/g，表明其具有良好的吸附效果。因此，利用生物模板制备的氧化镁空心管状纳米吸附剂可用作新型有机染料吸附剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Preparation of hollow MgO nanosorbents via the templating method and study of their adsorption mechanism

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Preparation of hollow MgO nanosorbents via the templating method and study of their adsorption mechanism

The treatment of dye-containing wastewater has been a concern in recent years. Herein, we used laboratory-waste-skimmed cotton as a biotemplate and successfully synthesized MgO hollow tubular nanosorbents via a mild microwave solvent-thermal method. In adsorption experiments, the response surface methodology and Box–Behnken design were used to optimize and determine the optimal Mg(OAc)₂ concentration (0.4 mol/L), skimmed cotton template mass (0.4 g), and calcination temperature for Congo red adsorption (600 °C). The adsorption process was comprehensively analyzed from thermodynamic and kinetic perspectives. Results showed that the adsorption process of MgO-urea template (MgO-UT) hollow nanosorbent conforms to the Dubinin–Radushkevich equation of the ion-exchange adsorption process and follows the pseudo-second-order kinetic model. The maximum amount of Congo red adsorbed by MgO-UT hollow nanosorbent is 3511.35 mg/g, demonstrating its excellent adsorption effect. Therefore, MgO hollow tubular nanosorbents prepared using biological templates can be used as novel organic dye adsorbents.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.