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T.S. Anirudhan,P.S. Suchithra 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.1
In this study, humic acid (HA) was immobilized onto amine-modified polyacrylamide/bentonite composite (Am-PAA-B) which was prepared by direct intercalation polymerization technique and the product (HA-Am-PAA-B) was used as an adsorbent for the removal of copper(II) ions from aqueous solutions. The surface characteristics of bentonite, Am-PAA-B and HA-Am-PAA-B were investigated. The adsorbent behaved like a cation exchanger andmore than 99.0% Cu(II) ions’ removal was observed at the pH range 5.0–6.0. Kinetic and isotherm experiments showed that amount of Cu(II) ions adsorbed increases with increase of the initial concentration and temperature. The adsorption kinetic data were interpreted by pseudo-first-order and pseudo-second-order rate equations. The suitability of Langmuir, Freundlich and Dubinin–Radushkevich (D-R) adsorption models to the equilibrium data was investigated. The Langmuir isotherm was found to provide the best theoretical correlation of the experimental equilibrium data. The thermodynamic and kinetic activation parameters were derived to predict the nature of adsorption process and discussed in detail. The isosteric heat of adsorption was constant even after increase in surface loading. The removal efficiency of HA-Am-PAA-B was tested using electroplating industry wastewater. The desorption of adsorbed Cu(II) ions was achieved by 0.1 M HCl and four adsorption/desorption cycles were performed without significant decrease in the adsorption capacity.
T.S. Anirudhan,Tharun A. Rauf 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Cellulose grafted epichlorohydrin (Cell-g-E) copolymer was synthesized and functionalization carried out using polyethylenimine (Cell-g-E/PEI). Characterization studies using FTIR, XRD and TGA, confirmed the grafting and functionalization process. Batch adsorption reaction was carried out for removal/recovery of nitrate ions and maximum adsorption capacity was obtained at pH 4.5. Kinetic studies explained pseudo-second-order as the best fit. Isotherm studies conducted at different temperatures revealed applicability of Freundlich isotherm model. Comparative studies proved effectiveness of Cell-g-E/PEI to other reported adsorbents. The adsorption process was spontaneous and exothermic. Batch adsorption/desorption studies for over six cycles showed the repeatability and regeneration capability of the adsorbent.
T.S. Anirudhan,J. Christa,Binusreejayan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
In the present study, a magnetic protein–polyelectrolyte complex of casein coated iron oxidenanoparticles and folic acid conjugated chitosan-graft-poly(2-dimethylaminoethyl methacrylate) wasprepared for the delivery of an anticancer drug, 5-fluorouracil (5-FU) and characterized using FTIR, XRD,VSM, FESEM, TEM, DLS and zeta potential studies. Sustained and controlled release of 5-FU was observedat acidic pH 5.0. Drug release kinetic studies indicated both swelling and diffusion controlled release. Invitro cytotoxicity studies revealed the low toxicity of the prepared nano drug carrier towards normal cellsand folate receptor targeting efficiency of 5-FU loaded carrier towards cancer cells.
T.S. Anirudhan,J.R. Deepa,Anoop S. Nair 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Chemically modified graphene oxide (CMGO)/nanohydroxy apatite (nHA) composite was synthesized viaa facile chemical modification of graphene oxide (GO) by triethyltetramine (TETA). Band gap of GO couldbe tuned for photo degradation under visible light through surface modification as well as by thecomposite formation with nHA. Pseudo-second-order kinetic model related the drug adsorption whiledegradation process followedfirst-order kinetics with Sips isotherm as the bestfitted model. Feasibilityof photo catalyst in the degradation of AM was tested using waste water samples collected from pollutedarea near to poultryfields and animal farm houses.
T.S. Anirudhan,F. Shainy 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
In the present study, a cellulose based adsorbent, P(MB-IA)-g-MNCC was synthesized by graft copolymerizationof itaconic acid onto MNCC using EGDMA as crosslinking agent and K2S2O8 as free radicalinitiator. P(MB-IA)-g-MNCC was characterized by FTIR, XRD, SEM, TG and VSM. Cd(II) adsorption occursmaximum at pH 6.0. Kinetic and isotherm data were described using pseudo-second-order kineticmodel and Sips isotherm model, respectively. Adsorbent dosage of 2.0 g/L was sufficient for the completeremoval of Cd(II) ions from aqueous solutions. The maximum adsorption capacity of P(MB-IA)-g-MNCCwas found to be 262.27 mg/g. Spent adsorbent was effectively regenerated using 0.1 M HCl.
T.S. Anirudhan,Tharun A. Rauf 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
A novel silane based adsorbent material, [stearyl alcohol (SA)-grafted-epichlorohydrin (E)]-grafted-aminoproypyl silanetriol (APST) was synthesized and functionalized with sulfonic acid [(SA-g-E)-g-APST/SO3H]. The adsorbent material was characterized by FTIR, XRD, SEM and BET analysis. Protein–particle interaction was studied by the immobilization of trypsin (TRY) using batch adsorption process. Maximum adsorption was attained at pH 7.0. Adsorption process followed pseudo-second-order kinetics; film diffusion controlled and Sips isotherm mechanism. Evaluation of separation factor (RL) and thermodynamic parameters revealed the favorability of adsorption process. Adsorption/desorption studies, for over six cycles showed the repeatability and regeneration capability of the adsorbent.
Reshma Lali Raveendran,Manjusha Valsala,Thayyath Sreenivasan Anirudhan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
Injectable hydrogels with macroscopic ordering have gained special attention in drug delivery due totheir excellent biocompatibility and minimally invasive surgical procedure. Nanosilver embeddedSchiff base hydrogel from biopolymers alginate and chitosan was developed and demonstrated its applicationin the injectable delivery of anticancer drug Dox.HCl. The ordered hydrogel structure was evidencedby FT-IR, DLS, XRD and Rheology. The self-assembled morphology of nanosilver- Schiff basehydrogels was studied by microscopic techniques such as SEM, TEM and AFM. The pH dependent anticanceractivity of the hydrogel was demonstrated by invitro drug release studies at pH 5.5 and 86.56 %release was obtained for 100 mgL-1 of Dox.HCl loaded hydrogel at 72 hours. The antibacterial activityattained from nanosilver can be assessed by Agar well diffusion assay and minimum inhibitory concentrationand minimum biocidal concentrations were determined as 62.5 lL/mL and 125 lL/mL, respectively. The invitro cell viability studies were done against skin cancer cell B16 by MTT assay whichshows 34.82 % of toxicity towards B16 cancer cells and the cell death was further confirmed byApoptosis assay and flow cytometry. The developed macroscopically ordered liquid crystalline hydrogelcan be act as a versatile platform for injectable drug delivery system.
Suneelkumar Chinni,Harshala Puttaganti,Madhusudhana Koppolu,Lavanya Anumula,Subha Anirudhan,Swapna Sannapureddy 대한치과보존학회 2021 Restorative Dentistry & Endodontics Vol.46 No.2
Objectives: The present study aimed to evaluate the survival rate and clinical performance of class 1 composite restorations restored with the Filtek Bulk Fill composite material using either the bulk fill technique or the incremental technique at baseline (1 week) and at 3, 6 and 12 months of follow-up. Materials and Methods: Forty-two patients with at least 2 carious teeth were selected. Following randomization, one tooth was restored with the Filtek Bulk Fill composite using the incremental fill technique, and the other tooth was restored with the same material using the bulk fill technique. Patients were recalled for follow-up at baseline (1 week) and 3, 6, and 12 months and evaluated using the FDI criteria. Results: The data were analyzed using the McNemar χ2 test. No statistically significant differences were found between the scores of teeth restored with either technique. At baseline and at 3, 6, and 12 months of follow-up; there were no significant difference in the clinical status of both groups of restorations. Conclusions: Within the limitations of this study, using the bulk fill technique for restorations with the Filtek Bulk Fill material seems to be equally efficient to using the incremental fill technique.