Browsing by Author "Gayathri N S"

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ADSORPTION DYNAMICS OF ECOFRIENDLY LITTER WASTES FOR ZN(II)/CR(VI) FROM ELECTROPLATING EFFLUENTS - CONTINUOUS COLUMN METHOD
(SOJ Materials Science & Engineering, 2016) Muthulakshmi Andal N; Charulatha S; Anuradha J; Gayathri N S
Electroplating industries, play a momentous role in the development and growth of numerous metal manufacturing, but also equally pollute the environment through various means. Most of the electroplating industries operated in Coimbatore are reported under Red category list, their main source of pollution being heavy metal leaching into aquatic streams. The present work deals with the sorption of Zn(II) and Cr(VI) being highly prevalent electroplating effluents. The process of biosorption has many attractive features compared to the conventional effluent treatment methods adopted so for. Batch studies are conducted at varying operating factors to assess the best sorption efficiency amongst the chosen cost effective and eco-friendly materials viz., Mussel Shell Powder (MSP), Prosopis juliflora Bark (PJB), Terminalia cattapa Seed Shell (TCSS) and Aegle marmeloscorrea (AMC). Based on the experimental data the Treated Mussel Shell Powder (TMSP) and Treated Prosopis juliflora Bark (TPJB) are found to be the best sorbent for Zn(II) and Cr(VI) removal respectively. The scaling up process through column experiments are performed to quantify the efficiency of the fixed sorbents under optimized conditions. The longterm analysis at the laboratory levels, reveal 100% and 92% metal removal for Zn (II) – TMSP and Cr (VI) TPJB systems respectively.
ADSORPTION DYNAMICS OF ECOFRIENDLY LITTER WASTES FOR ZN(II)/CR(VI) FROM ELECTROPLATING EFFLUENTS- CONTINUOUS COLUMN METHOD
(SOJ Material Science and Engineering (Symbiosis Open Access), 2016-01-03) Muthulakshmi Andal N; Charulatha S; Anuradha J; Gayathri N S
Electroplating industries, play a momentous role in the development and growth of numerous metal manufacturing, but also equally pollute the environment through various means. Most of the electroplating industries operated in Coimbatore are reported under Red category list, their main source of pollution being heavy metal leaching into aquatic streams. The present work deals with the sorption of Zn(II) and Cr(VI) being highly prevalent electroplating effluents. The process of biosorption has many attractive features compared to the conventional effluent treatment methods adopted so for. Batch studies are conducted at varying operating factors to assess the best sorption efficiency amongst the chosen cost effective and eco-friendly materials viz., Mussel Shell Powder (MSP), Prosopis juliflora Bark (PJB), Terminallia cattapa Seed Shell (TCSS) and Aegle marmelos correa (AMC). Based on the experimental data the Treated Mussel Shell Powder (TMSP) and Treated Prosopis juliflora Bark (TPJB) are found to be the best sorbent for Zn(II) and Cr(VI) removal respectively. The scaling up process through column experiments are performed to quantify the efficiency of the fixed sorbents under optimized conditions. The long term analysis at the laboratory levels, reveal 100% and 92% metal removal for Zn(II)-TMSP and Cr(VI)- TPJB systems respectively.
A COLLATIVE STUDY ON THE SORPTIVE NATURE OF TREATED/ NANOSIZED MATERIALS IN SEQUESTERING NICKEL IONS
(Kumaraguru College of Technology, Coimbatore, 2018) Gayathri N S; Anuradha J; Muthulakshmi Andal N
Presence of toxic heavy metals and synthetic chemicals exceeding their permissible limits in ground, surface and drinking waters has severe impact on human and aquatic life. The present work emphasizes the sorption efficiency of acid treated Prosopis juliflora Bark (TPJB) and its derived nano material in the process of Ni(ll) uptake from aqueous solutions. Acid treatment of raw material, subsequent nano sizing through ball-milling method have enhanced the metal retention property correspondingly. The size and the characterization of the material are supported by the optical microscopic, AFM, SEM and EDAX analyses. A twofold increase in the amounts of Ni(ll) adsorbed (mg/g) is registered by the prepared nanomaterial at the dosage of 150 mg against 300 mg required for TPJB under fixed optimized conditions. This collative study confirms the augmentation of active sorption sites in the nano particles, leading to effective adsorption at lower doses itself.
A COMPARATIVE STUDY ON THE SORPTION OF DIVALENT IONS BY BIVALVES SHELLS: EQUILIBRIUM AND STATISTICAL STUDIES
(Chemical Science Review and Letters, 2016) Muthulakshmi Andal N; Charulatha S; Gayathri N S; Anuradha J
The present study aims at examining the potentiality of the identified no- cost sorbent i.e. Bivalves shells to remove Cu(II) and Zn(II)ions from the aqueous solutions. These shells are collected from seashores, washed with double distilled water, dried, crushed andtreated using 0.1N HCl. The characteristics and functional groups present in the treated shells are supported by SEM, EDAX and Physio-chemical parameter analyses. Various operating factors influencing the adsorption of divalent ions onto the treated shells areexperimentally verified by Batch Equilibration method. The experimental results derived the following optimized conditions : 0.18mmsize, 1g dosage, 10 min agitation time, pH 7 environment for the trapping of Cu(II) ions (98.1% removal) and 0.18mm size, 1g dosage,60 min agitation time, pH 5.5 environment for that of Zn(II) ions (97% removal) at an initial concentration of 1000 mg/L in both thecases. Statistical analysis using SPSS software is carried out to assess the correlation of experimental values for both the systems withthe theoretical approach to justify the trapping ability of TMSP.
A COMPARATIVE STUDY ON THE SORPTION OF DIVALENT IONS BY BIVALVES SHELLS: EQUILIBRIUM AND STATISTICAL STUDIES
(Chemical Science Review and Letters (Aufau Periodicals), 2016) Muthulakshmi Andal N; Charulatha S; Gayathri N S; Anuradha J
The present study aims at examining the potentiality of the identified no- cost sorbent i.e. Bivalves shells to remove Cu(II) and Zn(II) ions from the aqueous solutions. These shells are collected from seashores, washed with double distilled water, dried, crushed and treated using 0.1N HCl. The characteristics and functional groups present in the treated shells are supported by SEM, EDAX and Physio-chemical parameter analyses. Various operating factors influencing the adsorption of divalent ions onto the treated shells are experimentally verified by Batch Equilibration method. The experimental results derived the following optimized conditions : 0.18mm size, 1g dosage, 10 min agitation time, pH 7 environment for the trapping of Cu(II) ions (98.1% removal) and 0.18mm size, 1g dosage, 60 min agitation time, pH 5.5 environment for that of Zn(II) ions (97% removal) at an initial concentration of 1000 mg/L in both the cases. Statistical analysis using SPSS software is carried out to assess the correlation of experimental values for both the systems with the theoretical approach to justify the trapping ability of TMSP.
EMERGING CONTAMINANTS AND EXTRACTION METHODS STRATEGY IN PULP AND PAPER INDUSTRIAL EFFLUENTS
(BODHI International Journal of Research in Humanities, Arts and Science, 2018) Muthulakshmi Andal N; Karthika S; Gayathri N S
Plenty of efforts have been put forth worldwide towards the environmental protection in recent years. The contribution of pulp and paper industries apart from their productions, significantly pollute water, air and soil through their direct and indirect discharges without adopting proper treatment technologies. Wastewaters from these industries possess large amounts of toxic inorganic moieties, exhibiting lesser biodegradability. The discharged effluents mark adverse impacts on human and environment. Many methods have been employed by researchers in treating these raw effluents let out from paper and pulp industries. This review discusses the advancement in research findings employing novel chelating methods for the contaminants like colour, BOD, COD, Suspended Solids, heavy metals from the aforesaid wastewaters, and also provides a baseline on environment protection initiatives in lieu of measures taken for creating a healthy environment.
AN INVESTIGATION APPROACH ON THE SEQUESTRATION OF DIVALENT METAL IONS EMPLOYING ANIMAL WASTE
(Oriental Journal of Chemistry, 2017) Gayathri N S; Muthulakshmi Andal N; Anuradha J
The current investigation deals with utilizing Treated Goat Hoof (TGH), a no cost material derived from butcher shop for the removal of Pb(II) and Cd(II) ions from aqueous media. FTIR / SEM analyses are carried out for the functional groups identification and describe the surface morphology of the chosen material respectively. Batch studies are experimented under varied operating factors viz., particle size, dosage, initial concentration, contact time and pH of the medium to assess the sorptive nature of the chosen material. Verification of the experimental data reveal the optimized conditions for the uptake of Pb(II) and Cd(II) by TGH. Langmuir model registered the best linearity amongst the isothermal plots derived for Langmuir, Freundlich and Tempkin models. Experimental results of both the systems: Pb(II) – TGH and Cd(II)- TGH are subjected to Statistical tool analyses using SPSS 20 software for significance and correlation assessment.
STEP-UP PROCESS OF AGRICULTURAL LITTER TO NANO SORBENT IN SEQUESTRATION OF NICKEL IONS – A COLLATIVE STUDY
(Sri Ramakrishna Engineering College, Coimbatore, 2018) Gayathri N S; Anuradha J; Muthulakshmi Andal N
Presence of toxic heavy metals and synthetic solutions exceeding their tolerance limits in ground, surface and drinking water bodies have severe impact on human and aquatic life. The present work is focused on the evaluation of the Nickel sorption efficiency for the chosen Prosopis juliflora Bark with appropriate acid modification and the derived nanomaterial being characterized by AFM, SEM and EDAX techniques. A two-fold increase in the adsorbed amounts is recorded for the nanomaterial at a dosage of 150mg against 300 mg of TPJB. A comparative study based on optimized conditions support the above statement, the better efficiency is favored due to higher surface area.