A5057803988- Advanced oxidation water treatment
- Water Treatment and Disinfection
- Mercury impact and mitigation studies
- Per- and polyfluoroalkyl substances research
- Environmental remediation with nanomaterials
- Electrochemical Analysis and Applications
- Pharmaceutical and Antibiotic Environmental Impacts
- Water Quality Monitoring and Analysis
- Adsorption and biosorption for pollutant removal
- Subcritical and Supercritical Water Processes
- Carbon Dioxide Capture Technologies
- Industrial Gas Emission Control
- Catalysts for Methane Reforming
- Toxic Organic Pollutants Impact
- Metal Extraction and Bioleaching
- Radioactive element chemistry and processing
- Air Quality and Health Impacts
- Advanced Photocatalysis Techniques
- Membrane Separation Technologies
- Analytical chemistry methods development
- Electrocatalysts for Energy Conversion
- Molecular Spectroscopy and Structure
- Nanomaterials for catalytic reactions
- Catalysis and Oxidation Reactions
- Mineral Processing and Grinding
University of California, Riverside
2022-2024
Tongji University
2015-2023
State Key Laboratory of Pollution Control and Resource Reuse
2015-2022
Shanghai Institute of Pollution Control and Ecological Security
2019-2021
State Council of the People's Republic of China
2016
Indian Institute of Science Bangalore
1985-2013
Permanganate can be activated by bisulfite to generate soluble Mn(III) (noncomplexed with ligands other than H2O and OH(-)) which oxidizes organic contaminants at extraordinarily high rates. However, the generation of in permanganate/bisulfite (PM/BS) process reactivity toward emerging have never been quantified. In this work, generated PM/BS was shown absorb 230-290 nm for first time disproportionated more easily higher pH, thus, utilization rate decomposing contaminant low under alkaline...
Sulfite [S(IV)] photolyzed with 254 nm ultraviolet (UV) light was used as a surrogate for S(IV)-based advanced oxidation processes (AOPs) to elaborate the S(IV) chain transformation process, which plays pivotal role in AOPs but is poorly understood. The level of degradation ibuprofen UV/S(IV) system increased an increase initiation rate transformation, and SO4•– major oxidant. Trace Mn(II) process promoted degradation, peroxymonosulfate production at pH 6.0–8.0 inhibited these 9.0. A...
The poor oxidation capacity of the Fe(II)/S2O82– [Fe(II)/PDS] system at pH > 3.0 has limited its wide application in water treatment. To unravel underlying mechanism, this study systematically evaluated possible influencing factors over range 1.0–8.0 and developed a mathematical model to quantify these effects. Results showed that ∼82% generated Fe(IV) could be used for pollutant degradation 1.0, whereas negligible contribution was observed 7.5. This dramatic decline with increasing...
This study explores the formation of bromate (BrO3–) in copresence Fe(VI) and bromide (Br–). It challenges previous beliefs about role as a green oxidant highlights crucial intermediates Fe(V) Fe(IV) conversion Br– to BrO3–. The results show that maximum concentration BrO3– 48.3 μg/L was obtained at 16 mg/L contribution Fe(V)/Fe(IV) positively related pH. suggests single-electron transfer from along with generation reactive bromine radicals is first step conversion, followed by OBr– which...
The total oxidizable precursor (TOP) assay has been extensively used for detecting PFAS pollutants that do not have analytical standards. It uses hydroxyl radicals (HO•) from the heat activation of persulfate under alkaline pH to convert H-containing precursors perfluoroalkyl carboxylates (PFCAs) target analysis. However, current TOP oxidation method does apply emerging because (i) many structures contain C–H bonds HO• attack and (ii) transformation products are necessarily PFCAs. In this...
Ion-exchange (IX) is an effective method for PFAS removal from water and wastewater, but the treatment of concentrated IX resin regeneration remains a major technical barrier. This study investigates challenges solutions associated with photochemical waste brines regeneration. We first tested defluorination perfluorooctanoic acid (PFOA) by UV/sulfite/iodide in synthetic containing individual inorganic organic species. identified NO3−, NO2−, natural matter (NOM) as inhibitors. NO3− NO2−...
The accelerating and inhibiting behavior of organic contaminant oxidation by MnO<sub>4</sub><sup>−</sup>and MnO<sub>2</sub>in the presence absence pyrophosphate (PP) under acidic conditions.
The graphic abstract showed the quenching efficiency of different quenchers for phenol oxidation by permanganate with molar quencher : over wide pH range.
Activating permanganate with reductants has gained increasing attention recently for efficient organic contaminants abatement via reactive intermediate Mn species. However, few studies have been conducted to explore the role of pyrophosphate (PP), a typical complexing agent species, in activated systems. In this study, taking sulfamethoxazole (SMX) as probe compound, influences PP on SMX degradation by permanganate/thiosulfate and permanganate/hydroxylamine were extensively studied. It was...
Sulfite (S(IV))-based advanced oxidation processes (AOPs), with SO4·– being the primary oxidant, have attracted increasing attention for degrading organic contaminants in water. However, side effect of S(IV) as a reductant on SO4·–-induced transformation has never been revealed. For first time, we demonstrated such an by taking MnO2/S(IV) system surrogate S(IV)-based AOP. Multiple evidence confirmed that is sole active oxidant system. The relative-rate experiments UV/S2O82– system,...
This study explored different pretreatment methods to enhance photochemical degradation of PFAS in still-bottom (SB) brine. The brine contained concentrated natural organic matter and inorganic salts, which severely inhibited destruction by prevailing technologies. Pretreatment evaluated included flocculation, Fenton oxidation, Soxhlet extraction. extraction works repeatedly passing a small volume solvent through the solid from drying SB, resulting efficient most PFAS. extract reduced 73%...