Abstract
Tannery effluents are ranked as the highest pollutants among all industrial wastes. Nowadays, disposal of chromium is one of the major emerging environmental problems in the tanning industry. Cr (VI) is highly toxic and soluble in water, and it is a strong oxidizing agent that causes severe damage to environment. The ability to reduce toxic substances to safe levels effectively and at a reasonable cost is very important. Clay and clay minerals have been used as an effective, low-cost method for the removal of heavy metals from industrial effluents. Organoclays are used as a wide range of adsorbents for removal of heavy metals from wastewater. The main objective of the paper is to examine the feasibility and efficiency of using organo-bentonite nanoparticle (OBN) and organo-kaolin nanoparticle (OKN) as the adsorbents for the removal of Cr (VI) ions from tannery effluent. Adsorption of Cr (VI) ions was carried out on a batch process. Experiments were performed as a function of pH, adsorbent concentration, and contact time. Based on the difference on Cr (VI) ion concentration before and after adsorption, the percentage reduction was calculated. A comparative study is made between OBN and OKN, and maximum reduction efficiency was achieved by OKN particle (95.3%). Isotherm data and kinetic studies were performed. The equilibrium adsorption isotherm was better described by Langmuir adsorption isotherm model. The adsorption kinetics well fitted using pseudo-second-order kinetic model.
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The authors convey sincere thanks to the Management and Principal of Coimbatore Institute of Technology for support through the Technical Education Quality Improvement Programme (TEQIP) fund.
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Uma Maheswari, B., Sivakumar, V.M., Thirumarimurugan, M. (2020). Comparative and Kinetics Studies of Organo-Nano-Kaolin Clay And Organo-Nano-Bentonite Clay as the Adsorbents for the Reduction of Chromium (VI) from Tannery Effluent. In: Sivasubramanian, V., Subramanian, S. (eds) Global Challenges in Energy and Environment. Lecture Notes on Multidisciplinary Industrial Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-9213-9_4
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DOI: https://doi.org/10.1007/978-981-13-9213-9_4
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