Development of cobalt-doped alumina hybrids for adsorption of textile effluents

Abstract

The discharge volume and composition of textile effluents gain scientific concern due to hazardous and biotoxic nature of azo dyes. Azo dyes are non-biodegradable due to its complex molecular structure and recalcitrant nature. Serious attempts have been made to synthesize and develop new materials to combat the environmental problems. The present study is designed for removal of azo dyes (Methyl orange, Congo red and Basic fuchsine) from synthetic aqueous solutions and real textile effluents. For this purpose, cobalt-doped alumina hybrids are synthesized and applied as adsorbents in batch experiment. Two different aluminium precursor (aluminium nitrate and spent aluminium foil) and glucose are mixed following sol-gel method to get hybrids. The synthesized hybrids are characterized for surface and bulk properties using Fourier transform infrared, scanning electron microscopy and energy dispersive X-ray techniques. The characterization of materials under Fourier transform infrared revealed that -OH (3487-3504 cm À1 ), C-H (2935-2985 cm À1 ), Al-O-C ($1380 cm À1 ), Al-O ($ 800 cm À1 ), Al-O-Al (659-669 cm À1 ) and Co-O (583-589 cm À1 ) groups participate in the binding of dyes onto the surface of hybrids. Amorphous shaped particles and elemental composition (carbon, aluminium and oxygen) are demonstrated in scanning electron microscopy-energy dispersive X-ray micrograph. Time-dependent batch experiments under identical experimental parameters showed 74% of basic fuchsine, 68% of methyl orange and 85% maximum removal of Congo red onto the surface of cobalt-doped alumina hybrids probably through ion exchange mechanism. The experimental data when treated with adsorption models and isotherms, pseudosecond-order kinetic and Freundlich isotherm are found to be best fitted. The present study accomplishes the successful synthesis of novel and efficient cobalt-doped alumina hybrids provides environmental friendly and economical alternative option to the commercial adsorbents for the treatment of textile effluents.

Adsorption of acid yellow dye 17 on activated carbon prepared from Euterpe oleracea: kinetic and thermodynamic studies

“…However, it is estimated that for the processing of about 12-20 tons of raw material are discarded daily between 1000 and 3000 m 3 of wastewater, thus promoting significant impacts on the environment (Ghaly, 2014). In addition, wastewater from activities in this sector has around 20% of dyes (Hynes et al, 2020;Khattab et al, 2020;Berradi et al, 2019), which are potentially toxic (Hynes et al, 2020;Benkhaya et al, 2020;Berradi et al, 2019;Verma et al, 2019;Obaid et al, 2016) generating negative impacts on the environment in terms of salinity, biological oxygen demand (BOD), chemical oxygen demand (COD), pH, temperature and others (Hynes et al, 2020;Berradi et al, 2019;Parveen & Rafique, 2018;Roy et al, 2018;Sarkar et al, 2017).…”

A review on the sustainability of textile industries wastewater with and without treatment methodologies

“…Their main finding was combustible waste produced from agriculture and industry sectors and further reused as an auxiliary fuel. Parveen and Rafique (185) developed an optimal technique without the use of additional chemicals at the time of pre-and post-treatment, and also studied the cost-benefit analysis of the proposed efficient method. They showed that the cost analysis of the aluminum salt and foil separately and reported that as the aluminum foil was a waste material it can be recycled and reused with a low operational cost.…”