| Abstrakt: |
Synthetic dyes are toxic and their release into the environment harms the ecosystem. Phycoremediation of synthetic dyes with acclimatized and native species has advantages over other methods. In this study, textile effluent-acclimatized microalgae species of Oscillatoria were grown in Bold's Basal Medium (BBM), dried, powdered using sonication, and optimized the removal malachite green (MG), using the response surface methodology (RSM). The effects of algal biosorbent concentration (AC), pH, and contact time (CT) were studied with 1 g L−1 MG in an aqueous solution, and the interaction model exerted significance (p < 0.001). The removal of MG was higher at alkaline pH (90% at pH 8.5) than at acidic pH (70% at pH 4). Under the optimized conditions of 1.2 g L−1 AC, 8.5 pH, and 30 min CT, the MG removal was documented at 90.8% with the biosorption capacity of 757 mg g−1. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analysis revealed the occurrence of different electronegative functional groups, aromatic vibrations, and the crystalline nature of the biosorbent. The algal sorbent exhibited a good performance of 80.9% for the removal of the crude color in real textile effluents. This microalgal sorbent is an attractive option for promoting large-scale applications. This study used an algal (Oscillatoria sp.,) biosorbent isolated from textile effluents, and it was acclimatized to a particular effluent (synthetic dye). This biosorbent was prepared using the sonication method and sieved using a 50-µm mesh. With this novel approach of biosorbent preparation (acclimatization and sonication), this study demonstrated the maximum adsorption capacity of malachite green at 757 mg g−1 biosorbent under optimized conditions (1.2 g of biosorbent, pH 8.5, and a contact time of 30 min). This algal biosorbent and preparation methods will have a huge impact on the wastewater treatment technology and possible applications at a large scale. Biosorbent was prepared using sonication of Oscillatoria sp., acclimatized to textile effluent. RSM revealed the optimized conditions of 1.2 g L−1 biosordent, 8.5 pH and 30 min contact time with 90% removal of malachite green (MG) Maximum biosorption capacity of 757 mg g−1 biosorbent was observed significantly Electronegative functional groups and the crystalline nature were liable for the biosorption. Under optimized conditions, 81% of crude color was removed from real textile effluent. [ABSTRACT FROM AUTHOR] |
