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      저자 : Fanhui Guo (검색결과 2 건)
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        Efficient removal of methylene blue via two-step modification hazelnut shell biochar: Process intensification, kinetics and thermodynamics

        Fanhui Guo,Sixi Guo,Yanjie Niu,Guofeng Qiu,Yang Guo,Yan Li,Liqing Chen,Yixin Zhang,Jianjun Wu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-

        Porous carbon materials with ultra-high specific surface area and adjustable pore structure characteristicswere prepared from food industry waste hazelnut shells for the adsorption of methylene blue (MB)wastewater by two-step activation by impregnation with ZnCl2 followed by chemical activation withKOH. The Fusso effect, which can reduce the size of MB molecules, was further used to enhance theadsorption of MB on porous carbon. The results show that both HSBC-a and HSBC-a-b have ultra-highspecific surface area (2979.59 m2/g for HSBC-a, 2882.73 m2/g for HSBC-a-b). The mesopore ratio ofHSBC-a-b (Vmeso/Vtotal % = 14.05%) was doubled compared to HSBC-a. It showed an excellent adsorptionperformance of 694.03 mg/g for MB. It showed a fast adsorption kinetics and the adsorbed amountincreased to 882.46 mg/g at 0.1 M NaCl solution. In addition, adsorption processes were studied usingadsorption kinetics and adsorption isotherm model fitting. The results of this research confirm that hazelnutshell is a kind of promising and sustainable porous carbon raw material, and its ultra-high specificsurface area and adjustable pore structure characteristics are favorable for the efficient treatment ofMB from dyeing wastewater. This work could provide potential guidance for the high-value utilizationof waste hazelnut shell biochar.

      • KCI등재

        Hierarchical porous composites derived from spent tire char for CO2 capture: K-N co-doped, process intensification and thermodynamic analysis

        Hongguan Wang,Guofeng Qiu,Yanjie Niu,Liqing Chen,Yan Li,Sixi Guo,Yixin Zhang,Jianjun Wu,Fanhui Guo 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-

        Spent tire is a kind of solid waste with large production, accumulation and great pollution. Spent tire charis the primary product of tire harmless disposal. Its commercial value is enhanced by modification. In thisstudy, K-N co-doped activated carbon was prepared by using spent tire char as raw material, KOH andmelamine as activator and dopant to enhance CO2 capture. In comparison with traditional process, thereasons for the decrease in specific surface area and pore volume caused by K doped have been identified,and a potential doped mechanism has been proposed. It was determined that pyridine nitrogen in theamino functional group played a key role in CO2 adsorption. Meanwhile, the synergistic intensificationof CO2 adsorption by potassium phenolic and pyridine nitrogen was verified by simplified model simulation. The precise K-N doping significantly intensify the CO2 adsorption capacity of spent tire char from0.45 to 2.60 mmol/g (1 bar, 0℃), an increase of 4.78 times. Thermodynamic studies have demonstratedthat the Langmuir model accurately describes the adsorption process, and the adsorption reaction takesplace spontaneously at temperatures below 80.52 C. This work presents an efficient process for upgradingspent tire char, and a novel method of co-treating waste and CO2.

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