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RISS 인기검색어
- 검색키워드
- 저자 : ( Lalchhingpuii ) (검색결과 6 건)
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Enhanced arsenate removal from water by silane grafted chitosan
( Lalhmunsiama ),( Lalchhingpuii ),( Diwakar Tiwari ),이승목 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The natural biopolymer chitosan is grafted with 3-aminopropyltriethoxysilane under the inert atmosphere in acetic acid-ethanol solvent mixture. The material is characterized by the FE-SEM (Field Emission Scanning Electron Microscopy) and FT-IR (Fourier transform Infrared) analysis. The surface morphology was slightly changed with the silane grafted-chitosan however; the EDX data confirms the introduction of silane compounds with the modified chitosan samples. The hybrid materials are then employed in the remediation of aqueous solutions contaminated with arsenic(V) under the batch and column reactor operations. The hybrid materials possessed extremely high sorption capacity of arsenic(V) comparing to bare chitosan. The high percent removal of As(V) was obtain within a pH ranges between pH 3.0-7.0 and slightly decrease beyond pH 7.0. The equilibrium sorption was achieved within 120 min of contact and the removal percent decrease from 99.91% to 62.10% while increasing the initial concentration from 1 to 20 mg/L. Moreover, the presence of co-existing ions could not significantly affect the removal of As(V) using the synthesized hybrid materials. Furthermore, the loading capacity of arsenic(V) under the dynamic conditions using hybrid materials packed columns was estimated and found to be 2.576 mg/g.
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( Lalhmunsiama ),( Lalchhingpuii ),( Diwakar Tiwari ),이승목 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In this study, the natural biopolymer, chitosan was grafted with 3-aminopropyl-triethoxysilane under the inert atmosphere in acetic acid-ethanol solvent mixture. The synthesized hybrid was heated at 500 ℃ for 3 hours to obtain microporous silica solid. The surface morphology of the material was obtained with the help of SEM images and the surface functional groups were characterized by FT-IR analysis. The microporous silica was successfully employed for the removal of Cu(II) and Pb(II) from aqueous solutions under batch reactor operations. An increase in the sorptive pH significantly favours Cu(II) and Pb(II) removal and the equilibrium state sorption data collected under concentration dependence studies were reasonably fitted to Langmuir and Freundlich adsorption isotherm. Furthermore, fixed bed column studies were conducted and the breakthrough data were fitted into non-linear Thomas equation and the loading capacity of Cu(II) and Pb(II) were evaluated.
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Lalhmunsiama,Lalchhingpuii,Nautiyal, B.P.,Tiwari, D.,Choi, S.I.,Kong, S.H.,Lee, S.M. Academic Press 2016 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.467 No.-
Hypothesis: Chitosan, naturally abundant biomaterial showed an insignificant affinity toward arsenate. The incorporation of organosilane could improve the physical and chemical properties of chitosan for the efficient removal of arsenate from aquatic environment. Experiment: The hybrid materials were obtained by grafting the natural biopolymer chitosan with 3-mercaptopropyl trimethoxysilane (CHMS) and trimethoxy-octylsilane (CHTS). The hybrid materials along with bare chitosan were characterized with SEM-EDX, FT-IR and BET specific surface area analyses and the solid materials were further employed in the efficient remediation of aqueous solutions contaminated with As(V) under batch and column reactor operations. Findings: The hybrid materials showed an extremely high percentage of As(V) removal compared to bare chitosan within a wide range of pH. As(V) was aggregated rapidly onto the solid surfaces and relatively high percent removal of As(V) was achieved in a wide range of As(V) initial concentrations. Moreover, As(V) was bound with, relatively, weaker forces and forming an 'outer sphere complexes' at the surface of solids. The presence of co-existing ions could not significantly affect the removal of As(V) from aqueous solutions. Furthermore, breakthrough data confirmed that these two hybrid materials possessed significantly high loading capacity of As(V) even under dynamic conditions.
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Silane grafted chitosan in the remediation of aquatic environment contaminated with As(V)
( Lalhmunsiama ),정현훈,( Lalchhingpuii ),( Diwakar Tiwari ),이승목 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The trimethoxy-octylsilaneis grafted with chitosan under the inert atmosphere in acetic acid-ethanol solvent mixture. The grafted solid provide additional silane functionality along with the enhanced settling capacity makes material easy separable. The material is characterized by the SEM-EDX and FT-IR analysis. The materials are further employed in the remediation of aqueous solution contaminated with As(V) under the batch reactor operations. Batch studies show thatthe material possesses extremely high percent removal of As(V) comparing to the bare chitosan within the wide pH range i.e., pH 3 -10. The concentration dependence data is utilized to model Langmuir and Freundlich adsorption isotherms. Moreover, the kinetic data is fitted well to the pseudo-second-order rate equations; hence, the equilibriumsorption capacity is estimated.
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Lee, S.M.,Lalchhingpuii,Lalhmunsiama,Tiwari, D. Elsevier 2016 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.296 No.-
The aim of this study is to synthesize the three different hybrid materials precursor to natural biopolymer chitosan. The silanes viz., 3-mercaptopropyl trimethoxysilane, trimethoxy(octyl) silane and 3-aminopropyl triethoxysilane were grafted with the chitosan network and were named as CHMS, CHTS and CHAS, respectively. The materials were characterized by the FT-IR spectrometry, SEM-EDX and XPS analyses. These solids were then employed in the efficient removal of Cr(VI) from aqueous solutions using batch and column reactor operations. The functionalized biomaterials possessed extremely high percent removal of Cr(VI) compared to bare chitosan at wide pH range i.e., pH ~3.0 to 8.0. A fast uptake of Cr(VI) was occurred and high percentage removal was obtained at wide range of Cr(VI) initial concentrations (7.7-100.58mg/L). The equilibrium state sorption data were utilized for the Langmuir and Freundlich adsorption isotherm studies. Similarly, an increase in background electrolyte concentrations from 0.0001 to 0.05mol/L NaNO<SUB>3</SUB> was assessed for the uptake of Cr(VI) by these hybrid materials. Relatively a fast uptake of Cr(VI) by these hybrid materials were obtained and further the time dependence data were fitted well to the pseudo-second-order and fractal-like pseudo-second-order kinetic models rather a pseudo-first-order kinetic model. Furthermore, a detailed sorption mechanism was included with the help of FT-IR, TOC and XPS analyses. In addition, CHMS and CHTS were used for dynamic studies under column reactor operations. The breakthrough curves were then used for the non-linear fitting of the Thomas equation and the loading capacity of the column for Cr(VI) were estimated.
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