Enhanced adsorption of Cr(VI), Ni(II) ions from aqueous solution using modified Eichhornia crassipes and Lemna minor
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ADVANCES AND CHALLENGES FOR SUSTAINABLE ECOSYSTEMS
Enhanced adsorption of Cr(VI), Ni(II) ions from aqueous solution using modified Eichhornia crassipes and Lemna minor Uma Maheswari Balasubramanian 1 & Sivakumar Vaiyazhipalayam Murugaiyan 1 & Thirumarimurugan Marimuthu 1 Received: 4 April 2019 / Accepted: 29 August 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract The environment is seriously affected by the release of hazardous heavy metals from the industries. The transformation of aquatic weeds into valuable nanosorbent has been considered as effective and efficient material in the wastewater treatment process. The aim of the study is to analyze the potential of nano-EC and nano-LM for the removal of chromium(VI) and nickel(II) ions. The characteristics of nanosorbent were analyzed using Fourier transform infrared spectroscopy (FTIR), Brunauer Emmett-Teller analysis (BET), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and thermo gravimetric analysis (TGA), respectively. Adsorptive performance of nanosorbent was studied with respect to pH, contact time, nano adsorbent dosage, and metal ion concentration. The maximum monolayer adsorption capacity of Cr(VI) and Ni(II) with respect to nano-EC was found to be 79.04 mgg−1 and 85.09 mgg−1, respectively. Adsorption isotherm and kinetic studies were performed and it was reported that adsorption isotherm follows Langmuir model with regression coefficient R2 > 0.9 for nano-EC and nanoLM respectively. The pseudo-second order model was found to fit well with experimental data. Experimental results suggested that nano-EC can be considered as a suitable nanosorbent for the removal of Cr(VI) and Ni(II) ions from effluents. Keywords Heavy metal . Nanosorbent . Eichhornia crassipes . Lemna minor . Adsorption . Isotherm . Kinetics
Introduction Environmental pollution is something that we face on an everyday basis, mostly due to the contamination of air, water, and soil. The occurrence and persistence of these heavy metals in the terrestrial, aquatic plants, animals, and surrounding agricultural regions undergo serious health risk due to pollution (Nguyen et al. 2019, Jacob et al. 2018, Yuzhong Niu et al. 2014). Industries such as tannery, battery, smelting of iron ores, fertilizer, and paint industries release major environmental contaminants such as heavy metals, etc. (Deniz and Karabulut 2017; Ibrahim et al. 2016). Heavy metals such as chromium, nickel, mercury, lead, arsenic, etc. are extremely carcinogenic and may easily accumulate into the micro organisms (Wang and Chen 2009). Among various heavy metals, Chromium and Nickel are considered to be deadliest toxic and Responsible editor: Tito Roberto Cadaval Jr * Sivakumar Vaiyazhipalayam Murugaiyan [email protected]; [email protected] 1
Department of Chemical Engineering, Coimbatore Institute of Technology, Coimbatore 641014, India
its exposure at higher concentration causes bone and liver cancer, kidney problems, nervous system disorders, respiratory tract
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