Detoxification of Chromium (VI) Ions in Aqueous Solution via Adsorption by Raw and Activated Carbon Prepared from Sugarcane Waste

The use of raw and modified agricultural waste primed from sugarcane as sorbents for the removal of Cr(VI) ions from aqueous solution were examined in a batch process. FT-IR analysis revealed that –OH, –NH, C–O and aromatic rings functional groups were involved in the sorption process. Sorption of Cr(VI) on raw and modified biomass were studied as a function of pH, contact time, initial metal concentration and temperature. Maximum experimental conditions were obtained to be initial metal concentration of 50 mg/L, temperature of 45oC, contact time of 60 minutes and pH of 2.0. The kinetics studies indicated that the sorption pattern for the sorption of Cr(VI) ions by raw sugarcane waste and acid modified sugarcane waste followed Ho’s-pseudo-second-order model, while that of carbonized acid modified sugarcane waste was well fitted by Largergren pseudo-first model. Thermodynamic parameters suggested the feasibility, spontaneity, endothermic and randomness of the sorption process. Thus, biomass from sugarcane waste can be deployed in the detoxification of Cr(VI) ions from aqueous solution.Keywords: Adsorption, Chromium, Kinetics, Pollution and Thermodynamic

Photocatalytic Activity of Green Mixed Matrix Membranes for Degradation of Anionic Dye

Anionic dye is a notable constituent of textile effluent, which renders water unsafe for human and animal use. A notable approach to mitigating effluent is the use of membranes. In this study, a mixed matrix technique was adopted for the preparation of composite membranes. The composite membranes consist of crumb rubber filled with nanoparticles, respectively. The membranes were characterized by Fourier transform spectroscopy, scanning electron microscopy coupled with energy dispersive x-ray, thermogravimetric analyser, and drop shape analyzer. The photocatalytic activities of the mixed matrix membranes were investigated with anionic dye in the UV/visible region. Photocatalytic activity of composite membranes showed high degradation with an apparent rate constant. This study presents a rubber-based membrane for wastewater treatment

Detoxification of Chromium (VI) Ions in Aqueous Solution via Adsorption by Raw and Activated Carbon Prepared from Sugarcane Waste

The use of raw and modified agricultural waste primed from sugarcane as sorbents for the removal of Cr(VI) ions from aqueous solution were examined in a batch process. FT-IR analysis revealed that –OH, –NH, C–O and aromatic rings functional groups were involved in the sorption process. Sorption of Cr(VI) on raw and modified biomass were studied as a function of pH, contact time, initial metal concentration and temperature. Maximum experimental conditions were obtained to be initial metal concentration of 50 mg/L, temperature of 45oC, contact time of 60 minutes and pH of 2.0. The kinetics studies indicated that the sorption pattern for the sorption of Cr(VI) ions by raw sugarcane waste and acid modified sugarcane waste followed Ho’s-pseudo-second-order model, while that of carbonized acid modified sugarcane waste was well fitted by Largergren pseudo-first model. Thermodynamic parameters suggested the feasibility, spontaneity, endothermic and randomness of the sorption process. Thus, biomass from sugarcane waste can be deployed in the detoxification of Cr(VI) ions from aqueous solution.Keywords: Adsorption, Chromium, Kinetics, Pollution and Thermodynamic

Synthesis, Characterization and Photocatalytic activity of silver and zinc codoped TiO2 nanoparticle for photodegradation of methyl orange dye in aqueous solution

In this study, TiO2 nanocrystals, 1 mol% Ag doped and 1 mol% Ag and 0.6 mol% Zn codoped TiO2 powders were synthesized by sol-gel route. Their photocatalytic activities on methyl orange dye under visible irradiation were investigated. The powders were characterized by X-Ray Diffraction (XRD), UV–Visible spectroscopy (UV-Vis), Brunauer–Emmett–Teller (BET) and Fourier Transform Infrared Spectroscopy (FT-IR). The XRD results revealed presence of rutile phase with average crystallite size between 9 and 11 nm. The UV-Vis spectra showed red-shift towards longer wavelength with corresponding decrease in band gap from 2.9 to 2.5 eV. The BET surface areas of the nanoparticles ranged from 4.7 to 11.8 m2g-1 with average pore size between 18.9 and 56.6 nm. The Ag doped TiO2 has the largest surface area of 11.8 m2g-1, while Ag-Zn co-doped TiO2 was found to have the highest pore size and volume. The absorption bands at 750-500 cm-1 were attributed to -O-Ti-O- bond in the TiO2 lattice. The photocatalytic efficiency was highest at optimum pH 4.1 for Ag-Zn codoped TiO2. The results confirmed that Ag doped and Ag-Zn co-doped TiO2 were more effective than pure TiO2. The kinetic data were fitted into pseudo-first-order equation using Langmuir-Hinshelwood kinetic modelThe accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author