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Muthulakshmi A.,Sathyabama University | Muthulakshmi A.,Jeppiaar Engineering College | Diana Florence D.,Sathyabama University | Diana Florence D.,Jeppiaar Engineering College | And 2 more authors.
International Journal of ChemTech Research

Heavy metal chemical stabilization with synthesized heavy metal chelating agents was assessed for the solid waste from chrome plating process. In the central railway workshop at Trichy, Tamilnadu, India chrome plating is done for rail engines. The solid waste (chrome sludge) finally obtained consists of heavy metals chromium, lead, zinc, cadmium, etc. which can leach. A new kind of heavy metal chelating agent showed more attractive competition than inorganic chemicals in stabilizing chrome sludge. The synthesizing method and treatment efficiency of heavy metal chelating agent in treating chrome sludge are experimentally studied and compared with the results of inorganic chemical agent sodium sulfide and organic chemical agent EDTA. The stabilized product using the synthetic chelating agent and EDTA can meet the land fill disposal controlling standards for heavy metal waste. The pH dependent leaching experiment showed the stabilized chrome solids by treatment with heavy metal chelating agents could ensure long term stabilization with a broad range of pH value. Thus the risk of secondary pollution for the stabilized products was reduced dramatically when the environmental condition changes during its disposal period. © 2014, Sphinx Knowledge House. All rights reserved. Source

Bhuvaneswari S.,St Josephs Engineering College | Aravind K.R.,St Josephs Engineering College | Ramkumar B.,St Josephs Engineering College | Vinod Raja N.,St Josephs Engineering College | And 3 more authors.
International Journal of ChemTech Research

In continuation of our previous studies, the bio-efficacy and the phytochemical constituents of leaves of 5 more common trees of Chennai was evaluated. Methanolic extracts of the leaves of 5 common trees in Chennai, i.e. Ceiba pentandra (Malvaceae), Couroupita guianensis (Lecythidaceae), Lannea coromandelica (Anacardiaceae), Mimusops elengi (Sapotaceae) and Plumeria obtusa (Apocynaceae) were studied for their bio activities. Antibacterial efficacy was studied through Micro-Broth Dilution method, antioxidant property using free radical scavenging assay with DPPH, larvicidal activity using the larvae of Artemia salina and pesticidal potential using the rice weevil, Sitophilus oryzae. The phytochemical studies revealed that saponin is present in all 5 tree leaves and phlobatannin is absent in all. The plant, Lannea coromandelica has showed significant activity against the bacteria studied. The plants Ceiba pentandra and Mimusops elengi have recorded EC50 value at lower concentration of 15 μg/mL. At 48 hours of exposure, 100% mortality of the larvae, Artemia salina was observed only for Lannea coromandelica. The pesticidal activity revealed that the maximum mortality (100%) was recorded at 24th hour treatment for all the leaf extracts of the plants studied. The study revealed that the leaves of different species exhibit different bio activities. The leaves of Lannea coromandelica has recorded better bactericidal and larvicidal activity. However, Ceiba pentandra and Mimusops elengi has recorded better antioxidant ability. Thus, proper scientific validation is needed to study the importance of individual plant in specific application. This results in identification of suitable plant material with certain biological properties. © 2014, Sphinx Knowledge House. All Rights Reserved. Source

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