Ball milling synthesized MnOx as highly active catalyst for gaseous POPs removal: significance of mechanochemically induced oxygen vacancies

Environmental Science & Technology
Yang YangGang Yu

Abstract

A rapid (1.5 h) one-step ball milling (BM) method was developed not only to modify commercial MnO2 via top-down approaches (BM0), but also to bottom-up synthesize MnO(x) by cogrinding of KMnO4 and MnC4H6O4 (BM1) or KMnO4 and MnSO4 (BM2). Catalysts activity on gaseous POPs removal was tested using hexachlorobenzene (HCBz) as surrogate. Catalytic performance decreases in the order of BM2 ≈ BM1 (T90% = 180-200 °C) > BM0 (260 °C) > CMO ≈ cryptomelane MnO2 (>300 °C). Both adsorption and destruction contribute to HCBz removal at 180 °C while destruction prevails at 200-300 °C. Mechanism studies show that destruction activity is lineally correlated with the amount of surface reactive oxygen species (Oads); stability is determined by the removal of surface chloride, which is associated with the mobility of bulk lattice oxygen (Olat); adsorption capacities are linearly correlated with surface area and pore structure. With the aid of extensive characterizations the excellent performance of BM prepared samples can be explained as (1) abundant surface vacancies enhance the generation of Oads; (2) massive bulk vacancies promote the mobility of bulk Olat; (3) large surface area and uniform pore size distribution facilitate the physisorption ...Continue Reading

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Citations

Feb 16, 2017·ChemSusChem·Inês C B MartinsM Teresa Duarte
May 6, 2019·Environmental Science and Pollution Research International·Weichuan QiaoQuhui Wang
Jul 1, 2020·Physical Chemistry Chemical Physics : PCCP·Rachel H BlackmorePeter P Wells
Mar 24, 2018·Environmental Science and Pollution Research International·Cuicui DuShengyong Lu
Jan 15, 2020·Environmental Science and Pollution Research International·Sin-Ling ChiamFei-Yee Yeoh
Dec 19, 2016·Environmental Science and Pollution Research International·Cuicui DuMingjiang Ni
Nov 18, 2018·Journal of Hazardous Materials·Yajie ShuDennis Y C Leung
Jan 12, 2021·Chemistry : a European Journal·Amol P AmruteFerdi Schüth
Mar 8, 2021·Journal of Colloid and Interface Science·Yangyang WangBeidou Xi
Jul 31, 2021·Journal of Hazardous Materials·Zhenghao XuJunhua Li
Sep 2, 2021·Environmental Science and Pollution Research International·Minghui TangShengyong Lu

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