Synthesis of a highly recoverable 3D MnO2/rGO hybrid aerogel for efficient adsorptive separation of pharmaceutical residue  

作　　者：Billie Yan Zhang Hiew Wan Ting Tee Nicholas Yung Li Loh Kar Chiew Lai Svenja Hanson Suyin Gan Suchithra Thangalazhy-Gopakumar Lai Yee Lee 

机构地区：[1]Department of Chemical and Environmental Engineering,University of Nottingham Malaysia,Jalan Broga,43500 Semenyih,Selangor Darul Ehsan,Malaysia [2]Department of Chemical and Environmental Engineering,University of Nottingham Ningbo China,Ningbo 315100,China

出　　处：《Journal of Environmental Sciences》2022年第8期194-203,共10页环境科学学报（英文版）

基　　金：the Ministry of Higher Education (MOHE) Malaysia for providing the financial support towards this work under the Fundamental Research Grant Scheme (No. FRGS/1/2020/STG05/UNIM/02/2)。

摘　　要：Water contamination by non-steroidal anti-inflammatory drugs,such as acetaminophen,is an emerging ecological concern.In this study,a newthree-dimensionalmanganese dioxideengrafted reduced graphene oxide(3D MnO_(2)/rGO)hybrid aerogel was developed for acetaminophen sequestration.The synthesis involved firstly the self-assembly of GO aerogel,followed by thermal reduction and in-situ MnO_(2) growth by redox-reaction.The aerogel demonstrated interlinked planes with smooth surfaces deposited with MnO_(2) nanospheres and pores of 138.4–235.3μm width.The influences of adsorbent dosage,initial pH,acetaminophen concentration,temperature and contact time were investigated.It was determined that the adsorption of acetaminophen occurred on uniform sorption sites in the aerogel,as suggested by the best fit of data to the Langmuir isotherm,yielding a maximum adsorption capacity of 252.87 mg/g.This highest adsorption performance of the 3D MnO_(2)/rGO aerogel was attained at a dosage of 0.6 g/L,initial pH of 6.2 and temperature of 40℃.The process kinetics were in-line with the pseudo-first-order and pseudo-second-order kinetics at 10 and 20–500 mg/L concentrations,respectively.Thermodynamic assay showed the spontaneity and endothermicity features of the 3D MnO_(2)/rGO-acetaminophen system.The acetaminophen adsorption mechanisms were mainly hydrogen bonding and pore entrapment.Moreover,the as-synthesised aerogel was effectively regenerated using acetone and re-utilised in four adsorption-desorption cycles.Overall,the results highly recommend the implementation of the 3D MnO_(2)/rGO hybrid aerogel for purification of wastewater polluted by acetaminophen residue.

关 键 词：ACETAMINOPHEN Adsorption Adsorption mechanism 3D reduced graphene oxide Manganese oxide nanoparticles REGENERATION 

分 类 号：X703[环境科学与工程—环境工程] O648.17[理学—物理化学] O647.3[理学—化学]