PMID- 32702240
OWN - NLM
STAT- MEDLINE
DCOM- 20201127
LR  - 20201127
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Linking)
VI  - 54
IP  - 16
DP  - 2020 Aug 18
TI  - Dissolved Silicate Enhances the Oxidation of Chlorophenols by Permanganate: 
      Important Role of Silicate-Stabilized MnO(2) Colloids.
PG  - 10279-10288
LID - 10.1021/acs.est.0c00826 [doi]
AB  - Dissolved silicate is an important background constituent of natural waters, but 
      there is little clarity regarding the effect of silicate on the oxidizing 
      capability of permanganate (Mn(VII)) and on its efficiency for remediation 
      applications. In the present study, we found that dissolved silicate, 
      metasilicate or disilicate (DS), could significantly promote the oxidation of 
      2,4-dichlorophenol (2,4-DCP) by Mn(VII), and the extent of the promoting effect 
      was even more evident than that of pyrophosphate (PP). The experiments showed 
      that, unlike PP, DS was not capable of coordinating with Mn(III) ions, and the 
      promoting effect of DS was not due to the oxidizing capability of complexed 
      Mn(III). Instead, DS ions, as a weak base, could combine with the hydroxyl groups 
      of MnO(2) via hydrogen bonding to limit the growth of colloidal MnO(2) particles. 
      The DS-stabilized colloidal MnO(2) particles, with hydrodynamic diameters less 
      than 100 nm, could act as catalysts to enhance the oxidation of 2,4-DCP by 
      Mn(VII). The best promoting effect of DS on the performance of Mn(VII) oxidant 
      was achieved at the initial solution pH of 7, and the coexisting bicarbonate ions 
      further improved the oxidation of 2,4-DCP in the Mn(VII)/DS system. Sand column 
      experiments showed that the combined use of Mn(VII) and DS additive could 
      mitigate the problem of permeability reduction of sand associated with the 
      retention of MnO(2) particles. This study not only deepens our understanding on 
      the role of dissolved silicate in a Mn(VII) oxidation process but also provides 
      an effective and green method to enhance the oxidizing capacity of Mn(VII)-based 
      treatment systems.
FAU - Yu, Minda
AU  - Yu M
AD  - School of Resource and Environmental Sciences, Hubei International Scientific and 
      Technological Cooperation Base of Sustainable Resource and Energy, Wuhan 
      University, Wuhan 430079, China.
AD  - State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese 
      Research Academy of Environmental Sciences, Beijing 100012, China.
FAU - He, Xiaosong
AU  - He X
AUID- ORCID: 0000-0001-7447-4848
AD  - State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese 
      Research Academy of Environmental Sciences, Beijing 100012, China.
FAU - Xi, Beidou
AU  - Xi B
AD  - School of Resource and Environmental Sciences, Hubei International Scientific and 
      Technological Cooperation Base of Sustainable Resource and Energy, Wuhan 
      University, Wuhan 430079, China.
AD  - State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese 
      Research Academy of Environmental Sciences, Beijing 100012, China.
FAU - Xiong, Ying
AU  - Xiong Y
AD  - Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, 
      School of Environmental Science and Engineering, Southern University of Science 
      and Technology, Shenzhen 518055, China.
FAU - Wang, Zhicheng
AU  - Wang Z
AD  - School of Resource and Environmental Sciences, Hubei International Scientific and 
      Technological Cooperation Base of Sustainable Resource and Energy, Wuhan 
      University, Wuhan 430079, China.
FAU - Sheng, Dige
AU  - Sheng D
AD  - School of Resource and Environmental Sciences, Hubei International Scientific and 
      Technological Cooperation Base of Sustainable Resource and Energy, Wuhan 
      University, Wuhan 430079, China.
FAU - Zhu, Li
AU  - Zhu L
AD  - School of Resource and Environmental Sciences, Hubei International Scientific and 
      Technological Cooperation Base of Sustainable Resource and Energy, Wuhan 
      University, Wuhan 430079, China.
FAU - Mao, Xuhui
AU  - Mao X
AUID- ORCID: 0000-0003-1720-255X
AD  - School of Resource and Environmental Sciences, Hubei International Scientific and 
      Technological Cooperation Base of Sustainable Resource and Energy, Wuhan 
      University, Wuhan 430079, China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20200810
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Chlorophenols)
RN  - 0 (Colloids)
RN  - 0 (Manganese Compounds)
RN  - 0 (Oxides)
RN  - 0 (Silicates)
RN  - 14333-13-2 (permanganic acid)
SB  - IM
MH  - *Chlorophenols
MH  - Colloids
MH  - *Manganese Compounds
MH  - Oxidation-Reduction
MH  - Oxides
MH  - Silicates
EDAT- 2020/07/24 06:00
MHDA- 2020/11/28 06:00
CRDT- 2020/07/24 06:00
PHST- 2020/07/24 06:00 [pubmed]
PHST- 2020/11/28 06:00 [medline]
PHST- 2020/07/24 06:00 [entrez]
AID - 10.1021/acs.est.0c00826 [doi]
PST - ppublish
SO  - Environ Sci Technol. 2020 Aug 18;54(16):10279-10288. doi: 
      10.1021/acs.est.0c00826. Epub 2020 Aug 10.