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RISS 인기검색어
- 검색키워드
- 저자 : Junhang Chen (검색결과 4 건)
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Renewable magnetic alginate-graphene oxide hybrid for efficient cationic dye removal
Wenju Liu,Hongjuan Bai,Weiqiang Gao,Zihan Chen,Zhuangzhuang Liu,Zilong Chen,Junhang Chen 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10
A batch system was applied to investigate the behavior of adsorption of methylene blue (MB) and crystal violet (CV) from aqueous solution using a renewable magnetic alginate composite containing graphene oxide (M-GO/ Alg) in single and binary systems. The surface morphology and chemical structure of the adsorbent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM) analysis. The experimental data were fitted by the isotherm models and adsorption kinetics. And the maximum adsorption quantity of MB and CV reached 459.85 and 69.46mg/g at 298 K for M-GO/ Alg, respectively, as deduced from Langmuir model. After five successive adsorptive removal cycles for both dyes, no significant performance loss was observed for M-GO/Alg. Moreover, M-GO/Alg was easily separated under an external magnetic field. In binary system, MB and CV exhibited competitive adsorption. The obtained results suggested that M-GO/Alg can be used as an eco-friendly and recyclable adsorbent to remove cationic dyes from aqueous solutions.
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Biocolloid transport and deposition in porous media: A review
Hongjuan Bai,Junhang Chen,Yumu Hu,Gang Wang,Wenju Liu,Edvina Lamy 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.1
In an effort to protect surface and groundwater supplies from contamination, to assess the risk of microbial groundwater contamination and for the purpose of soil bioremediation, considerable efforts have been made to investigate biocolloid transport and retention in porous media. The current work provides an introductory overview of biocolloid transport and deposition in porous media so as to have a better understanding of the environmental behavior of biocolloids. In this review, biocolloid transport and deposition in porous media are discussed with an emphasis on transport and deposition mechanisms, numerical modeling and influencing factors. Moreover, major findings with respect to the forces acting on biocolloid transport and deposition are addressed, and research methods used to study biocolloid transport and deposition in porous media are also presented. Finally, based on the reported results, future research perspectives considering the microscopic pore scale study for biocolloid transport and deposition in porous media are also suggested.
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Hongjuan Bai,Junhang Chen,Xiangyu Zhou,Chengzhi Hu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.11
Simultaneous removal of dyes in the effluents of printing and dyeing industries is challenging, and the mechanism of the co-adsorption of dyes is still unclear. In this context, a novel adsorbent based on microcrystalline cellulose from cotton fiber through a simplified chemical modification process was prepared. Methylene blue (MB) and neutral red (NR) were selected to investigate their adsorption/co-adsorption on such functionalized microcrystalline cellulose. The experimental adsorption results indicated that the adsorption quantity of both dyes was similar for the single solute. The kinetics of adsorption processes could be better described with the pseudo-second order models for both single and binary dye solutes. The results of the co-adsorption suggested that the extended Langmuir model could well predict equilibrium. The maximum adsorption capacity of MB and NR for the single systems was 115.2 and 83.2mg/g, respectively. Moreover, an antagonistic effect could be found in the binary dye solute. The obtained results revealed that the co-adsorption of dyes might be driven by hydrogen bonding, - stacking interaction as well as electrostatic interaction.
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Removal of fluoroquinolone antibiotics by adsorption of dopamine-modified biochar aerogel
Hongjuan Bai,Qiaofei Zhang,Xuan Zhou,Junhang Chen,Zihan Chen,Zhuangzhuang Liu,Jun Yan,Jing Wang 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1
As emerging contaminants used for treating various tract infections, fluoroquinolones (such as enoxacin, ofloxacin, etc.) enter water bodies via point-source discharges of wastewater treatment plants and many of them raise environmental and health concerns. Herein, a novel adsorbent, derived from a useful renewable low-cost grapefruit peel, was prepared to investigate the adsorption behavior of fluoroquinolone antibiotics (enoxacin and ofloxacin). The obtained adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray diffraction (XRD) and thermo-gravimetric analysis and differential scanning calorimetry (TG-DSC). Further, the equilibrium sorption of the adsorption process was analyzed with isotherm models and kinetic models. Under optimal adsorption conditions, equilibrium data conformed to the Elovich model, and the kinetics of adsorption was fitted well with Redlich-Peterson model. Combined with thermodynamic analysis, electrostatic interaction, hydrogen bond, π-π stacking interaction were the possible adsorption mechanisms for both fluoroquinolone antibiotics onto the novel adsorbent. This work explored a promising adsorbent for the elimination of fluoroquinolone antibiotics in environmental remediation.
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