Shangxiao Liu , Zhenxue Liu , Junkai Zhao , Xiaoxuan Wei
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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.
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.
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