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Preparation of ultrahigh-surface-area sludge biopolymers-based carbon using alkali treatment for organic matters recovery coupled to catalytic pyrolysis

引用

Journal of Environmental Sciences 2021年第8期33卷 83-96页

作者： Yu Zhang Jiayi Tang Weijun Zhang Jing Ai Yanyang Liu Qiandi Wang Dongsheng Wang School of Environmental Studies China University of GeosciencesWuhan 430074China Hubei Provincial Engineering Research Center of Systematic Water Pollution Control Wuhan 430074China Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco–Environmental SciencesChinese Academy of SciencesBeijing 100085China

In this work,we employed waste activated sludge(WAS)as carbon source to prepare ultrahigh specific surface area(SSA)biopolymers-based carbons(BBCs)through alkali(KOH)treatment coupled to pyrolysis *** the pyrolysis process,the involvement of KOH made a great recovery of soluble biopolymers from WAS,resulting in highly-efficient catalytic *** Brunner-Emmett-Teller and pore volume of BBCs prepared at 800℃(BBC800)reached the maximum at 2633.89 m2·g-1 and 2.919 m3·g-1,respectively.X-ray photoelectron spectroscopy suggested that aromatic carbon in the form of C=C was the dominant fraction of C element in *** N element in BBCs were composed of pyrrolic nitrogen and pyridinic nitrogen at 700℃,while a new graphitic nitrogen appeared over 800℃.As a refractory pollutant of wastewater treatment plants,tetracycline(TC)was selected to evaluate adsorption performance of *** adsorption behavior of BBCs towards TC was conformed to the pseudo-second-order kinetic and the Langmuir models,signifying that chemisorption of monolayers was dominant in TC *** adsorption capacity of BBC800 reached the maximum at 877.19 mg·g-1 for 90 min at 298 *** analysis indicated that the adsorption process was endothermic and *** bonding andπ-πstacking interaction were mainly responsible for TC adsorption,and interfacial diffusion was the main rate-control step in adsorption *** presence of sol-uble microbial products(SMPs)enhanced TC *** work provided a novel strategy to prepare bio-carbon with ultrahigh SSA using WAS for highly-efficient removal of organic pollutants.

关键词： Waste activated sludge biopolymers-based carbons Adsorption Tetracycline

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