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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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