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- 저자 : Shishir Sinha (검색결과 3 건)
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Prashant Srivastava,Shishir Sinha 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
The objective of this work was to investigate the effect of surface improvement on human hair fiber (HF) based high-density polyethylene (HDPE) reinforced polymer composites. A universal testing machine was used for the characterization of the mechanical behaviors of different types of HF base reinforced HDPE composites, and studies were conducted for the optimization of male/female fiber percentage (15% HF) in polymer composites. The alkali treatment (AT) and acrylic acid treatment (AAT) of HF reinforced HDPE composites showed a remarkable improvement in tensile strength (upto 15.487MPa and 15.638MPa, respectively), which was significantly changed in comparison to the tensile strength of untreated composites. FTIR and SEM test were used to characterize the fiber surface and HF/HDPE reinforced composites. Water absorption kinetics was investigated for the study of diffusion mechanism and kinetics of composites materials, which would be useful to boost the applications of the composite in different areas.
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Ranga Monica,Sinha Shishir,Biswas Pinakshi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
Textile wastewater was treated by an electrochemical process using Ti/RuO2 as anode and stainless steel as a cathode. Textile wastewater contains harmful dyes that can be broken down into simpler products like CO2 and H2O using the electro-oxidation process. For this process, a dimensional stable anode (Ti/RuO2) was fabricated using sol-gel method. Apreo field emission scanning electron microscopy (FE-SEM) with energy dispersed x-ray (EDX), atomic force microscopy (AFM), X-ray diffraction (XRD) has been done to study their characteristics. Design expert software was used to optimize the parameters using response surface methodology. Response parameters such as pH (2–10), current (0.5–2 A), initial concentration (50–200 mg/L), and time (2–15 min) were varied, and 30 sets of experiments were designed. The optimized value obtained for maximizing the dye degradation percentage and COD removal percentage is at initial pH of 3.3, current of 0.5 A, initial concentration of 50 mg/L, and time of 9.4 min for dye degradation of 99.82%, COD removal of 82.50% removal, and 1.81 kWh/m3 energy consumption (minimum) keeping 0.2 M NaCl electrolyte as constant. Kinetic study shows that the reaction is first order. The mechanism of the process was also studied using UPLC-QTOF. The total cost of the process was found to be ₹582.79 or $7.68. Characterization of the sludge was also done to check its reusability.
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Nirupama Prasad,Vijay Kumar Agarwal,Shishir Sinha 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.12
Coir fiber/low density polyethylene (LDPE) composites were fabricated with different fiber loading (10- 30 wt%) using compression molding technique. A fiber loading of 20 wt% was found optimum, with maximum mechanical properties. Further, the effect of fiber treatment (alkali and acrylic acid) and compatibilizer (MA-g-LDPE) incorporation on the mechanical and water absorption properties of the LDPE composites were studied and compared. The results showed that MA-g-LDPE incorporation into untreated and treated fiber composites led to improved mechanical properties and water resistance compared with the same composite formulation without MA-g-LDPE. However, treated fiber composites with MA-g-LDPE showed lower mechanical properties than untreated fiber without MA-g- LDPE, due to the removal of hydroxyl groups from the hemicellulose and lignin region of the fiber and degradation of fibers by chemical attack. From SEM studies on the tensile fractured composite samples, a good relationship has been observed between the morphological and mechanical properties.
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