Journal of Water Process Engineering
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2023
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IF 7
Di Zhang,Zhijun An,Yiwen Zhang,Yufeng Hu,Jingjing Zhan,Hao Zhou,Minghuo Wu
A continuous flow mode fixed-bed reactor (FBR) was built for the efficient degradation of triazine herbicides (THs) in wastewater, in which MoS 2 @SiO 2 composites were used as a co-catalyst for the Fe 2+ activated persulfate (PS) oxidation . The degradation activity of this MoS 2 @SiO 2 /PS/Fe 2+ FBR was evaluated by choosing atrazine (ATZ) as a model pollutant, and operation conditions were systematically optimized, including the amount of oxidant, Fe 2+ concentration, initial pH, flow rate, and coexisting interferences. The degradation results showed that MoS 2 @SiO 2 could greatly improve the degradation efficiency, and over 97.1 % of ATZ could be degraded under the optimized conditions (hydraulic residence time of 24 s). In this reaction system, sulfate radicals and hydroxyl radicals played the major roles (over 80 %) in the degradation process. Continuous treatment of 1400 mL wastewater could be achieved with 1.0 g MoS 2 @SiO 2 composite with a degradation efficiency maintained above 80 %. Four tested THs of ATZ, simazine , ametryn and prometryn could be efficiently degraded. Furthermore, the removal rate of ATZ in pond water reached 77.6 % and the mineralization rate was about 51 %, indicating this MoS 2 @SiO 2 /PS/Fe 2+ FBR was applicable in the treatment of real wastewater .
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Zhijun An,Yufeng Hu,Di Zhang,Hao Zhou,Jingjing Zhan,Minghuo Wu
Fenton-like reaction was considered one of the most prospective advanced oxidation processes in the removal of organic pollutants . To achieve efficient degradation of sulfonamides (SAs) in water, MoS 2 /SiO 2 composites (M@Si) were fabricated by a simple “one-pot” process and packed as fixed-bed reactors (FBR) for Fenton-like reaction. The SEM and XRD results showed the nano-sized MoS 2 particles (400 – 600 nm) were attached to the SiO 2 particles, confirming the successful fabrication of M@Si composites. The operation conditions for the M@Si FBR were systematically optimized, including H 2 O 2 concentration, Fe 2+ concentration, pH, bed height and flow rate, and the degradation rate of > 95% was realized for sulfisoxazole (20 mg/L) at a residence time of 15 s. M@Si Fenton FBR could enhance the Fe 3+ /Fe 2+ cycle for producing hydroxyl radicals (·OH) and self-generate singlet oxygen ( 1 O 2 ) from the interaction between H 2 O 2 and MoS 2 . Moreover, the M@Si FBR could be operated for over six days without the plunge of degradation efficiency. Finally, M@Si FBR was successfully applied in the degradation of SAs in pond water, demonstrating the application prospect of this reactor. This system presented a simple MoS 2 based Fenton catalyst for the efficient activation of hydrogen peroxide for the removal of antibiotics in continuous flow mode.
研究领域:
环境工程
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水处理
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催化
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材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Yongde Ma,Yanru Wang,Wenquan Wu,Jiayin Zhang,Yanning Cao,Kuan Huang,Lilong Jiang
Slurry-phase hydrocracking is one of the most advanced technologies for the conversion of inferior heavy oil to light fuel oil. In this work, MoS2 was combined with SiO2–ZrO2 mixed oxides to offer a new class of bifunctional catalysts for slurry-phase hydrocracking. In the bifunctional catalysts, SiO2–ZrO2 mixed oxides with abundant mesopores and acid sites act as cracking catalysts. They were presynthesized by a sol–gel-hydrothermal method and systematically characterized by X-ray diffraction (XRD), N2 adsorption, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programed desorption (NH3-TPD), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The effect of Si/Zr molar ratios on the chemical structure, especially the acid properties of SiO2–ZrO2 mixed oxides were examined. Subsequently, a mixture of decalin–phenanthrene was selected as the model system to investigate the performance of bifunctional catalysts. It was found that the conversions of decalin and phenanthrene were significantly improved for MoS2/SiO2–ZrO2 bifunctional catalysts. Further analysis indicated that the Brønsted acid sites of SiO2–ZrO2 mixed oxides played an important role in the improvement of decalin and phenanthrene conversions.
研究领域:
化学工程
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催化
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石油炼制
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Yongde Ma,Rengan Liang,Wenquan Wu,Jiayin Zhang,Yanning Cao,Kuan Huang,Lilong Jiang
Developing catalysts with not only hydrogenation activity but also cracking activity is very important for the advancement of suspended-bed hydrocracking technology. Within this respect, MoS 2 /SiO 2 -Al 2 O 3 bifunctional catalyst is a kind of typical catalysts with both hydrogenation and cracking activity. Herein, a series of Zr-doped SiO 2 -Al 2 O 3 mixed oxides were synthesized by a sol-gel coupled with hydrothermal method. The synthesized mixed oxides were characterized for chemical structures and acidic properties. It is found that doping SiO 2 -Al 2 O 3 with Zr atoms significantly increases the numbers of acidic sites. The Zr-doped SiO 2 -Al 2 O 3 mixed oxides were then combined with dispersed MoS 2 , which was in-situ produced from oil-soluble Mo precursors, to fabricate a novel kind of bifunctional catalysts for suspended-bed hydrocracking of heavy oils. Owing to the significantly increased numbers of acidic sites in Zr-doped SiO 2 -Al 2 O 3 mixed oxides, corresponding bifunctional catalysts demonstrate much enhanced activity for suspended-bed hydrocracking of heavy oils in relative to MoS 2 /SiO 2 -Al 2 O 3 bifunctional catalysts.
研究领域:
催化
·
化学工程
·
石油炼制
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）