Adsorption of Selenium Using Bagasse Fly Ash

• Published in: Clean : soil, air, water Vol. 37; no. 7; pp. 534 - 543
• Main Authors: Wasewar, Kailas L., Prasad, Basheshwar, Gulipalli, Sekhararao
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.07.2009; WILEY‐VCH Verlag; Wiley-VCH
• Subjects: Adsorption; Bagasse fly ash (BFA); Earth sciences; Earth, ocean, space; Equilibrium; Error analysis; Exact sciences and technology; Hydrology; Hydrology. Hydrogeology; Kinetics; Selenium; Thermal degradation; experimental studies; Fourier transformation; Error analysis; Bagasse fly ash (BFA); fly ash; degradation; solution; pH; temperature; Selenium; particles; infrared spectroscopy; chlorides; scanning electron microscopy; models; adsorption; Fourier analysis; isotherms; halides; differential thermal analysis; standard samples; equilibrium; kinetics; errors; standard deviation; Thermal degradation
• ISSN: 1863-0650; 1863-0669
• DOI: 10.1002/clen.200800183

The present work involves the study of Se(IV) adsorption onto bagasse fly ash. The adsorbents were coated with a ferric chloride solution for the effective removal of selenium. The physico‐chemical characterization of the adsorbent was carried out using standard methods, e. g., proximate analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, thermo‐gravimetric analysis and differential thermal analysis. Batch experiments were carried out to determine the effect of various parameters such as adsorbent dose, initial pH, contact time, and temperature on the adsorption process. Results obtained from these studies were analyzed using various kinetic models and isotherms. Se(IV) adsorption onto adsorbent was high at low pH values, and decreased with an increase in initial pH. A temperature study showed that the uptake of Se(IV) was greatest at 293 K, within the temperature range studied. The parameters of pseudo first order, pseudo second order, and Weber‐Morris intra‐particle kinetic models were determined. Equilibrium isotherms were analyzed using Langmuir, Freundlich, and Temkin isotherms. Error analyses were also carried out using hybrid fractional error function and Marquardt's percent standard deviation. Research Articles: The adsorption of Se(IV) onto bagasse fly ash which was coated with a ferric chloride solution for the effective removal of selenium was studied. The adsorbent was characterized and batch experiments were carried out to determine the effect of various parameters such as adsorbent dose, initial pH, contact time, and temperature on the adsorption process.