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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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병원의 서비스품질 및 서비스가치가 고객만족도에 미치는 영향: 한·중 종합병원의 비교분석을 중심으로
( Shi Chen ),( Zihan Zhou ),정진섭 ( Jin Sup Jung ) 한국유통경영학회 2021 유통경영학회지 Vol.24 No.4
Purpose: The goal of this study seeks to consider the impact of the hospital’s service quality and perceived service value on customer satisfaction. To this end, the two regions were compared and analyzed by customers visiting general hospitals in Osong (Korea) and Wuhan (China). Research design, data, and methodology: The independent variables (or service qualities) are set as assurance, responsiveness, empathy, tangibles, reliability, and accessibility, the dependent variable is customer satisfaction, and the mediating variable is (perceived) service value. Finally, convenience of facilities was set as a moderating variable. In this study, questionnaire design were constructed based on the model, and then empirical analyses were performed. Data were collected through questionnaires for customers who visited general hospitals in Osong, Korea and Wuhan, China. Multiple regression analyses were used for comparative analyses of the two regions. Results: Regarding the effect of ‘service qualities’ on ‘service value’, in Korea, ‘responsiveness’ and ‘tangibles’ did not show significant, while, in China, ‘assurance’ and ‘tangibles’ did not. Regarding the effect of independent variables on dependent variable, Korea did not show statistical significance in ‘responsiveness’, ‘empathy’ and ‘tangibles’, while China did not show in ‘responsiveness’. On the other hand, the mediating effect of ‘service value’ between the service quality and customer satisfaction was confirmed in both Korea and China, while the moderating effect of ‘convenience of facilities’ was not statistically significant in both Korea and China. Implications: Based on the empirical results, service quality and service value have a significant impact on customer satisfaction, so differentiation strategies by region for each characteristics of service quality will be needed. In addition, because the mediating effect of ‘service value’ is important, special attention should be paid to the perceived ‘service value.’ Finally this study suggested relevant practical and policy implications.
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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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The degradation of synthetic rubber surfaces by the adsorption of biofilms
Charles Darko,Benhao Xin,Jiaxin Liu,Benliu Wang,Zihan Hu,Li Chen,Jie Zhang 한국고분자학회 2023 Macromolecular Research Vol.31 No.10
Biofilms are said to feed on oil contents found in synthetic rubber compounds used in sealing, pipeline and water separation valve applications but the extent of the degradation is not known. This work provides a way of characterizing the microscopic degradation as a result of the microbial adsorption on the rubber compound surfaces. Pseudomonas aeruginosa bacteria were grown on ethylene propylene diene monomer (EPDM) rubber compounds having increasing oil amounts. Results revealed that the microorganisms adhered and fed more on the oil-rich surfaces than those with less oil or oil-less surfaces and promoted smooth morphologies with reduced surface roughness values. Furthermore, elongation at break results from tensile test measurement showed an increase in stiffness with increasing oil amount after the bacteria degradation. This work supports rubber engineers when selecting rubber compounds for water contact applications.
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