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- 저자 : Kunlun Wang (검색결과 2 건)
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Qianqian Fu,Hui Wang,Kunlun Nie,Rongfang Wang,Xuyun Wang,Jianwei Ren 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
The electrolytic recovery of quaternary ammonium hydroxide (R4NOH) from the wastewater produced inthe process of template-synthesizing molecular sieves has considerable economic benefits. The currentpractices are challenged by the anode corrosion and high operation costs due to harmful chlorine chemicalsin wastewater and high energy consumption. This work proposes a promising energy-saving strategyby combining the recovery of quaternary ammonium hydroxides with urea electrolysis technology. This strategy reduces the anodic oxidation potential and achieves low-energy consumption while avoidingthe formation of hypochlorite ions. Through the laboratory-scale closed membrane electrolysis system(CMES) cycle test, it was found that when the cathode output concentration of 0.5 M was reachedat a current density of 50 mA cm2, the energy consumption was saved by 64.7% compared with the traditionaltechnology. Along with the achievement of the expected recovery rate, the high value-addedR4NOH were recycled. More specifically, the ultra-low voltage of the electrolyze protected the ecosystemby avoiding the corrosion of harmful chlorine chemicals and demonstrated the potential for large-scaleapplications at the reduced process costs.
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Yifan Xu,Zhongyuan Liu,Kunlun Wang,Chunyao Niu,Pengfei Yuan,Jin You Zheng,Young Soo Kang,Xiao Li Zhang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
General modification that utilizes insoluble tungstic acid or highly toxic hydrofluoric acid to improvecharge separation and transfer in TiO2 results in considerable issues such as uneven doping, significantimpacts on particle size and morphology, as well as environmental hazards. In the present work, an environmentalbenign one-pot dual-modification approach was demonstrated that uses soluble sodium tungstateand only trace-level sodium fluoride as replacements. The photoactivity efficiency for decolorationof methylene blue (MB) solution was improved by 33.6% and 119.5% under ultraviolet and visible light,respectively. Meanwhile, the photocurrent density reached an enhancement by 181.2% by this dualmodification. The dual-modification had negligible influence on the crystal structure and the surface areaof the TiO2 nanoparticles. Density functional calculation suggested the remarkable improvements of thephotocatalysis of TiO2 can be ascribed to the rapid charge separation and transfer owing to the downshiftof conduction band from the tungsten doping and localized spatial charge separation from the surfacefluorination enabled by the dual-modification approach.
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