Journal
ENVIRONMENTAL ENGINEERING SCIENCE
Volume 38, Issue 12, Pages 1149-1157Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/ees.2020.0231
Keywords
co-catalytic; dye wastewater; Fenton reaction; molybdenum disulfide
Categories
Funding
- Program National Natural Science Foundation of China [41807469]
- Scientific Research Fund of Yunnan Provincial Education Department [2018JS026]
- Yunnan Applied Basic Research Project [2019FD038]
- Yunnan Provincial Scientific Innovation Team of Soil Environment and Ecological Safety [2019HC008]
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The study showed that using molybdenum disulfide (MoS2) as a co-catalyst in the Fenton system can accelerate the oxidation of organic dyes and enhance removal efficiency. Under optimal conditions, a degradation rate of 98% was achieved in 30 minutes.
Fenton reaction is extensively used in wastewater treatment to produce (OH)-O-center dot, which can be used to remove organic pollutants excellently. However, the greatest issue of the process is the low efficiency of Fe2+/Fe3+ conversion cycle and hydrogen peroxide (H2O2) decomposition rate (<30%). In this study, molybdenum disulfide (MoS2) was used as a co-catalyst in Fenton system to accelerate the oxidation of acid orange 7 (AO7) dye. The enhanced removal efficiency was attributed to that the unsaturated S atoms on the surface of MoS2 could capture the protons in solutions and turn into H2S, exposing the active sites with reducibility and accelerating the conversion of Fe2+/Fe3+. A high degradation rate of 98% was obtained in 30 min under the optimal conditions of AO7 concentration 100 mg/L, MoS2 6 g/L, FeSO4 center dot 7H(2)O 50 mg/L, H2O2 concentration 1.5 mmol/L, and pH 3.5. Furthermore, the degradation pathway and mechanism of AO7 were thoroughly discussed. The toxicity of the intermediates during the degradation progress slightly increased initially, which then decreased to nontoxicity. MoS2 can keep stable, which can maintain high AO7 removal efficiency even after being reused for seven times. Moreover, the obtained results provide a theoretical basis and guidance for the application of inorganic co-catalyst in practical wastewater remediation applications.
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