Role of Acid Functionalized-Nano Porous Carbon/MnO2 Composite for Removal of Arsenic from Aqueous Medium | Chapter 5 | Current Innovations in Chemical and Materials Sciences Vol. 5

Contamination of water with toxic substances due to rapid urbanization has become a worldwide cause of concern. Among these substances, arsenic occupies the topmost position in the priority list of hazardous substances given by ATSDR. Hence in the present study in order to eliminate the extra step of oxidizing As(III) in the process of arsenic removal by adsorption, a composite of acid-functionalized nanoporous carbon (Af-NPC) with MnO2 nanoparticles was synthesized. Nanoporous carbon (NPC) structures synthesized from grass clippings mown at the yard were acid-functionalized and coated with manganese oxide nanoparticles at room temperature. The synthesized composite was characterized by FTIR, XRD, BET, TEM, TGA and XPS. Characterization results showed the formation of an acid-functionalized nanoporous carbon/MnO2 (Af-NPC/MnO2) composite which was amorphous in nature. Af-NPC/MnO2 was further explored for the removal of As(III) and As(V) from the aqueous medium. Effects of factors such as pH, contact time, initial concentration and interfering ions on the adsorption of arsenic by Af-NPC/MnO2 were studied in detail. The mechanism of adsorption was also studied using experimental data determined. The kinetic study indicated that removal of arsenic followed pseudo-second-order kinetics and the experimental equilibrium data fitted better in the Langmuir isotherm model with maximum monolayer adsorption capacity of 8.85 mg/g and 9.43 mg/g for As(III) and As(V), respectively. The removal rate of arsenic was found to be very fast compared to other adsorbents. The results of this study imply that Af-NPC/MnO2 is an efficient adsorbent for the removal of As(III) and As(V) from an aqueous medium.

Author(s) Details:

Shahin Pathan,
Department of Chemical Sciences, Sunandan Divatia School of Science, NMIMS University, Vile Parle (West), Mumbai 400056, India and K.J. Somaiya Institute of Technology, Sion(E), Mumbai-400022, India.

Nancy Pandita,
Department of Chemical Sciences, Sunandan Divatia School of Science, NMIMS University, Vile Parle (West), Mumbai 400056, India.

Nand Kishore,
Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.

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Electrochemical Properties of MnO2 Nanoparticle Obtained from Waste Battery Powder by Reductive Acid Leaching Method | Chapter 2 | Newest Updates in Physical Science Research Vol. 5

 The goal of this study is to extract manganese dioxide (MnO2) nanoparticles from spent battery waste using environmentally safe leaching materials. Atomic Absorption Spectroscopy was used to determine the concentration of metals (AAS). Energy Dispersive X-ray analysis (EDAX), X-ray Diffractometer (XRD), scanning electron microscopy (SEM), and Fourier transform Infrared Spectroscopy (FTIR) were used to confirm the basic composition of metals recovered from dry cell batteries. Both Zn and Mn were higher at 90°C in the leaching investigations, and 4M sodium hydroxide was utilised as a precipitating agent to recover Mn as MnO2 nanoparticle. Cyclic voltammetry (CV) discloses the electrode's reversibility, whereas electrochemical impedance spectroscopy (EIS) indicates the electrode's charge transfer resistance (Rct) and capacitance. Among all the electrolytes, the electrode with 0.5M NaOH has the lowest Rct and the highest capacitance, suggesting greater conductivity and confirming that the charge transfer resistance and capacitive behaviour are faster.

Author (s) Details

M. Mylarappa
Sri Jagadguru Renukacharya College of Science Arts and Commerce, Race Course Road, Bengaluru-560009, Karnataka, India.

S. Kantharaju
Sri Jagadguru Renukacharya College of Science Arts and Commerce, Race Course Road, Bengaluru-560009, Karnataka, India.

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