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- 검색키워드
- 저자 : C. Lalhriatpuia (검색결과 3 건)
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Nanopillars TiO2 thin film photocatalyst application in the remediation of aquatic environment
C. Lalhriatpuia,Alka Tiwari,Diwakar Tiwari,Alok Shukla,Seung-Mok Lee 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12
We assessed the photocatalytic behavior of Nanopillars-TiO2 thin films obtained onto a borosilicate glass in the degradation of 17α-ethynylestradiol (EE2) from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM, AFM analytical methods. BET specific surface area and pore sizes were also obtained. The photocatalytic degradation of EE2 using the UV light was studied at wide range of physico-chemical parametric studies to determine the mechanism of degradation as well the practical implacability of the technique. The batch reactor operations were conducted at varied pH (pH 4.0 to 10.0), EE2 initial concentration (1.0 to 5.0mg/L) and presence of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of EE2. The time dependence photocatalytic degradation of EE2 was demonstrated with the pseudo-first-order rate kinetics. The mineralization of EE2 was assessed using the total organic carbon analysis conducted at varied initial pH and EE2 concentrations. Further, the repeated use of the photocatalyst enhanced the applicability of thin films in the successive photocatalytic operations.
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Efficient removal of 17β-estradiol using hybrid clay materials
Thanhmingliana,C. Lalhriatpuia,Diwakar Tiwari,Seung Mok Lee 대한환경공학회 2016 Environmental Engineering Research Vol.21 No.2
Hybrid materials were obtained modifying the bentonite (BC) and local clay (LC) using hexadecyltrimethylammonium bromide (HDTMA) or the clay were pillared with aluminum followed by modification with HDTMA. The materials were characterized by the SEM, FT-IR and XRD analytical tools. The batch reactor data implied that the uptake of 17β-estradiol (e₂) by the hybrid materials showed very high uptake at the neutral pH region. However, at higher and lower pH conditions, slightly less uptake of e₂ was occurred. The uptake of e₂ was insignificantly affected changing the sorptive concentration from 1.0 to 10.0 mg/L and the background electrolyte (NaCl) concentrations from 0.0001 to 0.1 mol/L. Moreover, the sorption of e₂ by these hybrid materials was fairly efficient since within 30 mins of contact time, an apparent equilibrium between solid and solution was achieved, and the data was best fitted to the PSO (pseudo-second order) and FL-PSO (Fractal-like-pseudo second order) kinetic models compared to the PFO (pseudo-first order) model. The fixed-bed column results showed that relatively high breakthrough volume was obtained for the attenuation of e₂ using these hybrid materials, and the loading capacity of e₂ was estimated to be 75.984, 63.757, 58.965 and 49.746 mg/g for the solids BCH, BCAH, LCH and LCAH, respectively.
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Diwakar Tiwari,이승목,C. Lalhriatpuia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
Hybrid materials (AAS (Al-AMBA-sericite and AHS (Al-HDTMA-sericite)) was obtained and materials arecharacterized by XRD, SEM and IR analytical techniques. Hybrid materials were assessed for efficientremoval of diclofenac from aqueous solutions. Increasing the diclofenac concentration (1.0 to 20.0 mg/L)and pH 2 to 7 favored greatly the removal of diclofenac by AAS and AHS. Background electrolyteconcentrations from 0.0001 to 0.1 mol/L NaCl, insignificantly affected percent removal of diclofenac. Thebreakthrough results were fitted well to the Thomas equation and hence, loading capacity of diclofenacwas found to be 0.561 and 1.056 mg/g for AAS and AHS, respectively.
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