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Improved dyes separation performance of reduced graphene by incorporation MoS2 nanosheets
Xiaojin Wei,Xiaotao Fan,Yimeng Deng,Liqiang Li,Xiaolong Han,Ping Lu,Chao Huang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
The hydrothermal reduced graphene (rGO) and the layered MoS2 nanosheets prepared by the liquidphasestripping method were blended, and then the MoS2-rGO composite membranes were preparedon the polyvinylidene fluoride (PVDF) supporting membranes by vacuum filtration method. A varietyof characterization methods such as Fourier transform infrared spectrometer (FT-IR), X-ray photoelectronspectroscopy (XPS) and X-ray diffractometer (XRD) were used to verify the successful introduction ofMoS2 into rGO layers and the changes of interlayer structure of the MoS2-rGO membranes. Finally, theeffect of MoS2 loading on separation performance of the MoS2-rGO composite membrane was investigated. The results show that the separation performance of the membrane with 33.33% of MoS2 loading(MrG3) is the most excellent. The permeability of MrG3 membrane is 118.21 Lm-2h1 bar1, whichis about 4.4 times that of the pristine rGO membrane. Meanwhile, the rejection of the MrG3 membranefor Methyl blue, Crystal violet, Rhodamine B, and Congo red all exceed 80%.
Wenjing Xu,Zhanggen Huang,Qianqian Guo,Yaqin Hou,Xiaojin Han 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
The SO2 oxidation over V2O5/AC catalyst was studied using an in situ diffuse reflectance infrared Fouriertransformation spectroscopy technique at 120 oC. Results reveal that the surface oxygen groups could neither act asactive sites for SO2 oxidation nor supply the oxygen needed for VV↔VIV redox cycle. The vanadia species and gasphase oxygen are essential for SO2 oxidation. During SO2 oxidation over V2O5/AC, the surface hydroxyl groups involvein the formation of sulfate species. The role of water vapor in flue gas might be to supplement the hydroxyl groupsconsumed so that the SO2 oxidation could continue.
Qianqian Guo,Wen Jing,Shangzeng Cheng,Zhanggen Huang,Dekui Sun,Yaqin Hou,Xiaojin Han 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
To determine the role of sulfur groups formed on activated carbon (AC) in the selective catalytic reduction (SCR) of NO with NH3, coal-based AC was modified by H2SO4 under various conditions and then treated in N2 atmosphere at 400 oC. The resulting carbons were characterized by N2 adsorption, elemental analysis, temperature programmed desorption and X-ray photoelectron spectroscopy, and tested for the SCR of NO with NH3 in the temperature range of 30-250 oC. Results reveal that H2SO4 modification has little effect on the textural properties, but promotes the formation of sulfur and oxygen groups. The sulfur groups incorporated by H2SO4 modification are mainly sulfonic groups and then sulfates. In particular, these sulfur groups play a predominant role in improving NH3 adsorption and then enhancing the SCR activity of modified carbons above 150 oC. However, the contribution of oxygen groups to NO reduction is very limited under the conditions employed in this work.