Enhanced degradation of organic contaminants using catalytic activity of carbonaceous structures:A strategy for the reuse of exhausted sorbents  

作　　者：Kalyani Mer Baharak Sajjadi Nosa.O.Egiebor Wei-Yin Chen Daniell.L.Mattern Wendong Tao 

机构地区：[1]Environmental Resources Engineering Department,SUNY College of Ervironmental Science and Forestry,Syracuse,NY 13210,USA [2]Department of Chemical Engineering,School of Engineering,University of Mississippi,MS 38677-1848,USA [3]Department of Chemistry and Biochemistry,University of Mississippi,MS 38677,USA

出　　处：《Journal of Environmental Sciences》2021年第1期267-273,共7页环境科学学报（英文版）

基　　金：the financial support of the National Science Foundation(NSF EPSCoR RII Grant No.OIA-1632899)。

摘　　要：Generation of hydroxyl radicals(·OH)is the basis of advanced oxidation process(AOP).This study investigates the catalytic activity of microporous carbonaceous structure for in-situ generation of·OH radicals.Biochar(BC)was selected as a representative of carbon materials with a graphitic structure.The work aims at assessing the impact of BC structure on the activation of H2O_(2),the reinforcement of the persistent free radicals(PFRs)in BC using heavy metal complexes,and the subsequent AOP.Accordingly,three different biochars(raw,chemically-and physiochemically-activated BCs)were used for adsorption of two metal ions(nickel and lead)and the degradation of phenol(100 mg/L)through AOP.The results demonstrated four outcomes:(1)The structure of carbon material,the identity and the quantity of the metal complexes in the structure play the key roles in the AOP process.(2)the quantity of PFRs on BC significantly increased(by 200%)with structural activation and metal loading.(3)Though the Pb-loaded BC contained a larger quantity of PFRs,Ni-loaded BC exhibited a higher catalytic activity.(4)The degradation efficiency values for phenol by modified biochar in the presence of H2O_(2) was 80.3%,while the removal efficiency was found to be 17%and 22%in the two control tests,with H2O_(2)(no BC)and with BC(no H2O_(2)),respectively.Overall,the work proposes a new approach for dual applications of carbonaceous structures;adsorption of metal ions and treatment of organic contaminants through in-situ chemical oxidation(ISCO).

关 键 词：BIOCHAR Graphitic carbons Persistent free radicals(pfrs) Advanced oxidation process(aop) Hydrogen peroxide PHENOL 

分 类 号：X703[环境科学与工程—环境工程]