Manjula Rani K - Academia.edu (original) (raw)
Papers by Manjula Rani K
International Journal of Innovative Research in Science, Engineering and Technology, 2014
Pyrazolo derivatives have been the basis of numerous drugs and dyes used in industries, hitherto ... more Pyrazolo derivatives have been the basis of numerous drugs and dyes used in industries, hitherto of its possessing analgesic and antipyretic properties in addition to its base unit exhibiting dyeing characteristics. No doubt, owing to their synthetic utility in many products, interest in developing a new procedure becomes enviable. Quite a large number of medicinal plants in Indian subcontinent contain heterocyclic components in roots, stem and shoot system. Also a good number of the Pyrazolo derivatives are found in seeds, for example water melon seeds found to contain Pyrazolo in the concentration range of 250-410 μg/l on a specific variety. As for the bio synthetic activity is concerned, most plants have properties relating to anti-inflammatory, diagnostic acid, antibacterial, hypoglycemic, sedative-hypnotic etc. Herein, this paper deals with the synthesis and characterization of Pyrazolo derivative namely pyrazolidino [3, 4-b] quinoline by IR and NMR techniques. The data reveals...
The adsorption of hexavalent chromium, present in effluents of various industries such as electro... more The adsorption of hexavalent chromium, present in effluents of various industries such as electroplating, tannery, etc., on Coal Fly Ash (CFA) has been investigated in the present study. Parameters like contact time, adsorbent dose, pH and initial chromium ion concentration were studied in kinetic batch experiments at 25°C. Among all the parameters, pH of the solution was most effective for chromium removal. The adsorption of hexavalent chromium on CFA was found to be maximum at low pH. The adsorption data fit well with Langmuir and Freundlich isotherm models. The Langmuir adsorption isotherm to the systems yielded maximum adsorption capacity of 19.77 mg/g at the solution pH of 2. Results showed that the pseudo second order kinetic model best correlate with the experimental data.
In the present investigation, the activated carbon was prepared from tea dust material and utiliz... more In the present investigation, the activated carbon was prepared from tea dust material and utilized for the removal of Basic violet-14 from aqueous solution. The experimental studies were carried out in a batch mode by varying the parameters such as initial dye concentration, adsorbent dose, temperature and pH. The experimental data were analyzed by both kinetic and isotherm models. Pseudo second order kinetics was well fitted than first order kinetics with the rate constants in the range of 1.286X10 -4 to 1.653X10 -4 gmg -1 min -1 . Maximum dye removal was observed at pH=3.05. Thermodynamic parameters calculated for the adsorption of Basic Violet-14 and observed that the adsorption was spontaneous and endothermic with negative G 0 ranges from -1.75 to -5.03 KJ/mol and the positive H 0 value ranges from 2026 KJ/mol. Hence the prepared TWAC was an alternate to commercial activated carbon and also effective for the removal of BV-14 from aqueous solution.
The feasibility of the removal of Reactive Red -141 (RR-141) by two different adsorbent materials... more The feasibility of the removal of Reactive Red -141 (RR-141) by two different adsorbent materials namely zinc aluminium carbonate layered double hydroxide (ZAC-LDH) and calcined LDH (CZA-LDH) from aqueous solution has been investigated. To investigate the adsorption capacities of the adsorbent, batch mode adsorption studies has been performed for the removal of RR-141 using different parameters such as initial dye concentration, adsorbent dosage, contact time, temperature and p H. The various adsorption kinetic studies such as pseudo first order, pseudo second order and intra particle diffusion models are performed. The pseudo-second-order kinetic model is fitted well with high correlation coefficient. The optimum p H for maximum dye removal is found to be highly acidic (i.e., p H 2). Both Langmuir and Freundlich isotherm models described the adsorption mechanism of dye by both the adsorbents. The FESEM images and XRD pattern confirmed that the adsorption and intercalation of RR-141...
An attempt was made to synthesize nano-sized silica from cow dung ash, which has good potential s... more An attempt was made to synthesize nano-sized silica from cow dung ash, which has good potential source of silica. The silica from the cow dung was converted into sodium silicate and then the SiO2 Precipitated in a controlled manner using surfactant. The nano sized amorphous silica was characterized using SEM, EDX and XRD data. The XRD powder pattern confirms the amorphous nature of SiO2. An FTIR study was also carried out to evaluate the purity and surface functionalities present in nano silica. FTIR spectra recorded for the n- SiO2 and Commercial SiO2. Both the samples show almost similar IR spectra confirms the purity of n-SiO2. Biologically diverse countries like India have lot of potential by-products from agro and animal based wastes, many of which are not explored for their further utility. Exploration of useful materials will make any process economically beneficial and also minimizes the environmental pollution created by waste products. Cattle dung is one of the most abunda...
DESALINATION AND WATER TREATMENT
Journal of Inorganic and Organometallic Polymers and Materials
International Journal of Innovative Research in Science, Engineering and Technology
In the present investigation, the activated carbon was prepared from tea dust material and utiliz... more In the present investigation, the activated carbon was prepared from tea dust material and utilized for the removal of Basic violet-14 from aqueous solution. The experimental studies were carried out in a batch mode by varying the parameters such as initial dye concentration, adsorbent dose, temperature and pH. The experimental data were analyzed by both kinetic and isotherm models. Pseudo second order kinetics was well fitted than first order kinetics with the rate constants in the range of 1.286X10-4 to 1.653X10-4 gmg-1 min-1. Maximum dye removal was observed at pH=3.05. Thermodynamic parameters calculated for the adsorption of Basic Violet-14 and observed that the adsorption was spontaneous and endothermic with negative G 0 ranges from-1.75 to-5.03 KJ/mol and the positive H 0 value ranges from 20-26 KJ/mol. Hence the prepared TWAC was an alternate to commercial activated carbon and also effective for the removal of BV-14 from aqueous solution.
Asian Journal of Research in Social Sciences and Humanities
Removal of anionic dyes namely Acid Violet-17(AV-17) and Direct Red-7 (DR-7) from aqueous solutio... more Removal of anionic dyes namely Acid Violet-17(AV-17) and Direct Red-7 (DR-7) from aqueous solution were investigated by calcined zinc aluminium layered double hydroxide (CZA-LDH). Batch adsorption studies were carried out by varying the parameters such as contact time, adsorbent dose, initial dye concentration, temperature and pH. The equilibrium adsorption capacity of AV-17 (adsorbent dose 0.5g/L) and DR-7(adsorbent dose 0.125g/L) dyes were increased from 48.08 mg/g to 172.55 mg/g and 200 mg/g to 683.33 mg/g respectively with increase of initial dye concentration from 25 mg/L to 100 mg/L at 30°C. Similarly the percentage of dye removal was decreased from 100% to 85.42% and 96.15% to 86.27% for DR-7 and AV-17 respectively with increase of initial dye concentration from 25 mg/L to 100 mg/L. The adsorption kinetics of both the anionic dyes AV-17 and DR- 7 by CZA-LDH followed the pseudo second order kinetic model with high correlation coefficient values (R2) than the pseudo first order. The experimental data were well fitted with Freundlich isotherm model rather than Langmuir model. The adsorption equilibrium was more favourable at acidic pH than alkaline pH for both dyes. The thermodynamic parameters like ΔGo and ΔHo calculated for AV-17 and DR-7 revealed that the adsorption process is spontaneous and endothermic in nature. The XRD pattern of CZA-LDH before and after the adsorption of AV-17 and DR-7 proved the intercalation of anionic dyes between the layers with memory effect by the reconstruction of its original layered structure. This was further evidenced by slight increase in the interlayer distance. The adsorption processes were further supported by Langmuir dimensionless separation factor RL and n value of the Freundlich Equation. Thermal regeneration and reusability of CZA-LDH was performed for the removal of AV-17 & DR-7. The recycling and reusability for the dye removal up to second cycle for both anionic dyes were remarkable and suggested that the CZA-LDH was an effective adsorbent for the removal of anionic dyes AV-17 and DR-7 from aqueous solution.
DESALINATION AND WATER TREATMENT
International Journal of Innovative Research in Science, Engineering and Technology, 2014
Pyrazolo derivatives have been the basis of numerous drugs and dyes used in industries, hitherto ... more Pyrazolo derivatives have been the basis of numerous drugs and dyes used in industries, hitherto of its possessing analgesic and antipyretic properties in addition to its base unit exhibiting dyeing characteristics. No doubt, owing to their synthetic utility in many products, interest in developing a new procedure becomes enviable. Quite a large number of medicinal plants in Indian subcontinent contain heterocyclic components in roots, stem and shoot system. Also a good number of the Pyrazolo derivatives are found in seeds, for example water melon seeds found to contain Pyrazolo in the concentration range of 250-410 μg/l on a specific variety. As for the bio synthetic activity is concerned, most plants have properties relating to anti-inflammatory, diagnostic acid, antibacterial, hypoglycemic, sedative-hypnotic etc. Herein, this paper deals with the synthesis and characterization of Pyrazolo derivative namely pyrazolidino [3, 4-b] quinoline by IR and NMR techniques. The data reveals...
The adsorption of hexavalent chromium, present in effluents of various industries such as electro... more The adsorption of hexavalent chromium, present in effluents of various industries such as electroplating, tannery, etc., on Coal Fly Ash (CFA) has been investigated in the present study. Parameters like contact time, adsorbent dose, pH and initial chromium ion concentration were studied in kinetic batch experiments at 25°C. Among all the parameters, pH of the solution was most effective for chromium removal. The adsorption of hexavalent chromium on CFA was found to be maximum at low pH. The adsorption data fit well with Langmuir and Freundlich isotherm models. The Langmuir adsorption isotherm to the systems yielded maximum adsorption capacity of 19.77 mg/g at the solution pH of 2. Results showed that the pseudo second order kinetic model best correlate with the experimental data.
In the present investigation, the activated carbon was prepared from tea dust material and utiliz... more In the present investigation, the activated carbon was prepared from tea dust material and utilized for the removal of Basic violet-14 from aqueous solution. The experimental studies were carried out in a batch mode by varying the parameters such as initial dye concentration, adsorbent dose, temperature and pH. The experimental data were analyzed by both kinetic and isotherm models. Pseudo second order kinetics was well fitted than first order kinetics with the rate constants in the range of 1.286X10 -4 to 1.653X10 -4 gmg -1 min -1 . Maximum dye removal was observed at pH=3.05. Thermodynamic parameters calculated for the adsorption of Basic Violet-14 and observed that the adsorption was spontaneous and endothermic with negative G 0 ranges from -1.75 to -5.03 KJ/mol and the positive H 0 value ranges from 2026 KJ/mol. Hence the prepared TWAC was an alternate to commercial activated carbon and also effective for the removal of BV-14 from aqueous solution.
The feasibility of the removal of Reactive Red -141 (RR-141) by two different adsorbent materials... more The feasibility of the removal of Reactive Red -141 (RR-141) by two different adsorbent materials namely zinc aluminium carbonate layered double hydroxide (ZAC-LDH) and calcined LDH (CZA-LDH) from aqueous solution has been investigated. To investigate the adsorption capacities of the adsorbent, batch mode adsorption studies has been performed for the removal of RR-141 using different parameters such as initial dye concentration, adsorbent dosage, contact time, temperature and p H. The various adsorption kinetic studies such as pseudo first order, pseudo second order and intra particle diffusion models are performed. The pseudo-second-order kinetic model is fitted well with high correlation coefficient. The optimum p H for maximum dye removal is found to be highly acidic (i.e., p H 2). Both Langmuir and Freundlich isotherm models described the adsorption mechanism of dye by both the adsorbents. The FESEM images and XRD pattern confirmed that the adsorption and intercalation of RR-141...
An attempt was made to synthesize nano-sized silica from cow dung ash, which has good potential s... more An attempt was made to synthesize nano-sized silica from cow dung ash, which has good potential source of silica. The silica from the cow dung was converted into sodium silicate and then the SiO2 Precipitated in a controlled manner using surfactant. The nano sized amorphous silica was characterized using SEM, EDX and XRD data. The XRD powder pattern confirms the amorphous nature of SiO2. An FTIR study was also carried out to evaluate the purity and surface functionalities present in nano silica. FTIR spectra recorded for the n- SiO2 and Commercial SiO2. Both the samples show almost similar IR spectra confirms the purity of n-SiO2. Biologically diverse countries like India have lot of potential by-products from agro and animal based wastes, many of which are not explored for their further utility. Exploration of useful materials will make any process economically beneficial and also minimizes the environmental pollution created by waste products. Cattle dung is one of the most abunda...
DESALINATION AND WATER TREATMENT
Journal of Inorganic and Organometallic Polymers and Materials
International Journal of Innovative Research in Science, Engineering and Technology
In the present investigation, the activated carbon was prepared from tea dust material and utiliz... more In the present investigation, the activated carbon was prepared from tea dust material and utilized for the removal of Basic violet-14 from aqueous solution. The experimental studies were carried out in a batch mode by varying the parameters such as initial dye concentration, adsorbent dose, temperature and pH. The experimental data were analyzed by both kinetic and isotherm models. Pseudo second order kinetics was well fitted than first order kinetics with the rate constants in the range of 1.286X10-4 to 1.653X10-4 gmg-1 min-1. Maximum dye removal was observed at pH=3.05. Thermodynamic parameters calculated for the adsorption of Basic Violet-14 and observed that the adsorption was spontaneous and endothermic with negative G 0 ranges from-1.75 to-5.03 KJ/mol and the positive H 0 value ranges from 20-26 KJ/mol. Hence the prepared TWAC was an alternate to commercial activated carbon and also effective for the removal of BV-14 from aqueous solution.
Asian Journal of Research in Social Sciences and Humanities
Removal of anionic dyes namely Acid Violet-17(AV-17) and Direct Red-7 (DR-7) from aqueous solutio... more Removal of anionic dyes namely Acid Violet-17(AV-17) and Direct Red-7 (DR-7) from aqueous solution were investigated by calcined zinc aluminium layered double hydroxide (CZA-LDH). Batch adsorption studies were carried out by varying the parameters such as contact time, adsorbent dose, initial dye concentration, temperature and pH. The equilibrium adsorption capacity of AV-17 (adsorbent dose 0.5g/L) and DR-7(adsorbent dose 0.125g/L) dyes were increased from 48.08 mg/g to 172.55 mg/g and 200 mg/g to 683.33 mg/g respectively with increase of initial dye concentration from 25 mg/L to 100 mg/L at 30°C. Similarly the percentage of dye removal was decreased from 100% to 85.42% and 96.15% to 86.27% for DR-7 and AV-17 respectively with increase of initial dye concentration from 25 mg/L to 100 mg/L. The adsorption kinetics of both the anionic dyes AV-17 and DR- 7 by CZA-LDH followed the pseudo second order kinetic model with high correlation coefficient values (R2) than the pseudo first order. The experimental data were well fitted with Freundlich isotherm model rather than Langmuir model. The adsorption equilibrium was more favourable at acidic pH than alkaline pH for both dyes. The thermodynamic parameters like ΔGo and ΔHo calculated for AV-17 and DR-7 revealed that the adsorption process is spontaneous and endothermic in nature. The XRD pattern of CZA-LDH before and after the adsorption of AV-17 and DR-7 proved the intercalation of anionic dyes between the layers with memory effect by the reconstruction of its original layered structure. This was further evidenced by slight increase in the interlayer distance. The adsorption processes were further supported by Langmuir dimensionless separation factor RL and n value of the Freundlich Equation. Thermal regeneration and reusability of CZA-LDH was performed for the removal of AV-17 & DR-7. The recycling and reusability for the dye removal up to second cycle for both anionic dyes were remarkable and suggested that the CZA-LDH was an effective adsorbent for the removal of anionic dyes AV-17 and DR-7 from aqueous solution.
DESALINATION AND WATER TREATMENT