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Catalytic Process Optimization of Birnessite‐based Fenton‐like Reaction with Surface Cu 2+ Modification
Author(s) -
Zang Chengjie,
Hu Shiyu,
Jin Shihu,
Chen Feng
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800505
Subject(s) - birnessite , catalysis , radical , surface modification , chemistry , inorganic chemistry , ion , ion exchange , oxygen , chemical engineering , organic chemistry , manganese oxide , engineering
Layer‐structured birnessite (δ‐MnO 2 ) has been applied recently in the heterogeneous Fenton‐like process. However, easy deactivation and low utilization efficiency of H 2 O 2 limit its practical application. The catalytic processes of H 2 O 2 on birnessite were successfully regulated via surface chemical modification as Cu 2+ ions were intercalated into the birnessite by the ion‐exchange method (CuBir). The triple‐corner‐sharing inner‐sphere surface complexes of Cu 2+ ions (TCS species) formed above Mn vacancies could effectively weaken the over‐complexation of H 2 O 2 on the surface of [MnO 6 ] sheets, and then decrease the self‐consumption of surface‐formed superoxide radicals. The surface TCS species have excellent Fenton‐like performances and enhance the conversion efficiency of H 2 O 2 into reactive oxygen species (ROS). Moreover, the surface Cu 2+ ‐modification engineering could prevent deactivation owing to degradation intermediate residues and improve the recyclability of catalyst.