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RISS 인기검색어
- 검색키워드
- 저자 : Haripada Bhunia (검색결과 3 건)
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Jasminder Singh,Haripada Bhunia,Soumen Basu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
The present study reports the use of nanocasted carbon monoliths (CMs) as adsorbents synthesized by using furfuryl alcohol as carbon precursor and silica monoliths (SM) as a template for CO2 capture. The oxygen content decreases from 18.92 to 14.38% with increase of carbonization temperature from 550 to 950 °C. BET surface area and total pore volume of CM carbonized at 950 °C was found to be maximum i.e. 1225 m2 g−1 and 1.26 cm3 g−1, respectively with the presence of a large number of micropores and mesopores. Performance evolution of the CMs was done thermogravimetrically at different adsorption temperatures and CO2 concentrations and found that, CM-950 shows the highest CO2 capacity (1.6 mmol g−1) which is approximately three times higher than SM (0.52 mmol g−1). The CMs exhibit stable CO2 uptake capacities (≥1 mmol g−1) with easy regenerability over multiple adsorption–desorption cycles. Furthermore, fractional order kinetic model provided the best description over all adsorption temperatures and CO2 concentrations. Heterogeneous nature of the carbon surface was confirmed from the Temkin isotherm fit and isosteric heat of adsorption (Qst) values.
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Deepak Tiwari,Simarjot Kaur,Haripada Bhunia,Pramod K. Bajpai 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
Carbon dioxide capture needs development of cost effective CO2 capture technologies. This paper describes oxygen enriched nanostructured carbons synthesized from nanocasting technique using mesoporous silica as template and resorcinol-formaldehyde as precursor. Carbonization at various temperatures (600 °C–800 °C) was carried out to develop range of carbon adsorbents. Thorough characterization of textural, surface and chemical properties was carried out on prepared carbons and evaluated for CO2 capture performance using thermogravimetric analyser under dynamic conditions. Highest dynamic CO2 uptake capacity was reported to be 1.5 mmol g−1 by SRF-700 at 30 °C in 100% pure CO2. The CO2 uptake performance of the prepared carbons is affected by both the textural properties and surface chemistry. Four adsorption–desorption cycles established the material with complete stability and regenerability. Fractional order kinetic model completely described CO2 adsorption on prepared carbons. Thermodynamic parameter values suggested spontaneous, random and exothermic nature of the process. Energetically heterogeneous surface of adsorbent was confirmed by best fitting of Temkin isotherm and random pattern of isosteric heat of adsorption with surface coverage. Approximately, 1.82 MJ per kg CO2 thermal energy is required for desorption process.
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Metali Sarkar,Vikas K. Sangal,Haripada Bhunia 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.3
Hydrodynamic study of Activated Sludge Process (ASP) is important to optimize the reactor performance and detect anomalies in the system. Residence time distribution (RTD) study has been performed using LiCl as tracer on a pilot scale aeration tank (AT) and ASP, treating the pulp and paper mill effluent. The hydraulic performance and treatment efficiency of the AT and ASP at different operating parameters like residence time, recycle rate was investigated. Flow anomalies were identified and based on the experimental data empirical models was suggested to interpret the hydrodynamics of the reactors using compartment modelling technique. The analysis of the RTD curves and the compartment models indicated increase in back-mixing ratio as the mean hydraulic retention time (MHRT) of the tank was increased. Bypassing stream was observed at lower MHRT. The fraction of dead zone in the tank increased by approximate 20-25% with increase in recycle rate. The fraction of the stagnant zone was found well below 5% for all performed experiments, which was under experimental error. The substrate removal of 91% for Chemical oxygen demand and 96% for Biochemical oxygen demand were observed for the ASP working at a hydraulic mean residence time 39 h MRT with a 20% recycling of activated sludge.
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