http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Parimal Chandra Bhomick (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Parimal Chandra Bhomick,Aola Supong,Rituparna Karmaker,Mridushmita Baruah,Chubaakum Pongener,Dipak Sinha 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4
Single-step potassium hydroxide synthesized activated carbon was prepared from Schima wallichii biomass by optimizing process parameters at different carbonization temperature (500 oC, 600 oC, 700 oC and 800 oC) and biomass to KOH impregnation ratio (1 : 0, 1 : 1, 1 : 2 and 1 : 3). The optimum condition for obtaining the best activation carbon was found to be at 600 oC and 1 : 2 impregnation ratio with BET surface area, total pore volume, and pHzpc of 1,005.71m2g1, 0.491 cm3g1 and 6.11, respectively. SEM and XRD analysis revealed the ordering of the graphitic layer with more pores in the carbon matrix at optimized conditions. Batch adsorption experiments were run for fluoride adsorption and fitted, of which Langmuir isotherm model seems to be the best-fitted model with maximum adsorption capacity of 2.524mgg1. Adsorption kinetics was elucidated best with the pseudo-second-order kinetic model. Theoretical calculations indicate that the adsorption of fluoride is favorable on edge site of both zig-zag and arm chair carbon models with chemisorption type of interaction. Fluoride uptake was found to be affected by the presence of co-ion in the order: CO3 2>SO4 2>NO3 >Cl.
-
Aola Supong,Parimal Chandra Bhomick,Upasana Bora Sinha,Dipak Sinha 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12
Porous activated biocarbon from Ravenna grass was utilized as an adsorbent for the removal of 4-Nitrophenol from aqueous solution. Chemical activation process using potassium hydroxide was adopted for the activated biocarbon preparation. The essential features of the prepared adsorbent represented by BET surface area, pore volume and pHZPC were 919m2g 1, 0.324cm3g 1 and 8.1 respectively. SEM, FTIR, XRD and TGA analysis revealed the microcrystallite and porous structure of the synthesized biocarbon with abundant functional groups and high thermal stability. Batch adsorption tests were conducted for 4-Nitrophenol adsorption, and the optimum adsorbent dose, pH, initial 4-Nitrophenol concentration and contact time were found to be 0.5g, 7, 400mgL 1 and 40minutes, respectively. The equilibrium isotherm study revealed the suitability of the Langmuir isotherm with a maximum adsorption capacity of 50.89mg/g. The pseudo-second-order kinetic model well represented the adsorption kinetics data, while thermodynamics study indicated the spontaneity (G<0) and endothermic nature (H>0) of the adsorption of 4-Nitrophenol. Density functional theory (DFT) calculations performed at the B3LYP level indicated that the interaction of 4-Nitrophenol with pristine and functionalized activated biocarbon is favorable.
-
Mridushmita Baruah,Soremo Likongthung Ezung,Aola Supong,Parimal Chandra Bhomick,Suraj Kumar,Dipak Sinha 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.6
In this work, the synthesis, characterization, and photocatalytic activity of iron-doped titanium dioxide nanoparticles (FDT) supported on environmentally benign activated carbon (PAC) has been discussed. The photocatalytic activity of the nanocomposite was investigated for the degradation of Congo red (CR) dye from aqueous solution under visible light (520 nm), and it was observed that 100% degradation for 20 ppm CR solution took place within 60 mins. The experimental data of photodegradation of CR using the FDT/PAC nanocomposite had the highest correlation with Langmuir Hinshelwood model and pseudo-first-order rate kinetics with an apparent rate constant of 0.05341min-1 and half-life period of 12.97mins, respectively. The thermodynamics study revealed that the degradation process is exothermic and spontaneous. The effect of interfering ions on the degradation of CR solution was also examined. The photocatalytic antibacterial activity of the nanocomposite was tested against two bacteria pathogens, Escherichia coli and Staphylococcus aureus, and it was found that for the concentration of 105 CFU ml-1, 100% photocatalytic inactivation was achieved for both Escherichia coli in 120mins and Staphylococcus aureus in 75 mins under visible light irradiation. The total electrical energy consumed and operating cost were measured and the total operating cost was 312.50, 236.74, and 166.67 INR (Indian rupee) for 20 ppm, 60 ppm, and 100 ppm CR dye removal using 0.06 g FDT/PAC nanocomposite, respectively.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
