Department of Botany and Biotechnology, Milad-E-Sherif Memorial (MSM) College, Kayamkulam, Kerala, India.
Department of Botany and Biotechnology, AJ College of Science and Technology, Thonnakal, Trivandrum, India.
Chemosphere. 2022 Nov;306:135479. doi: 10.1016/j.chemosphere.2022.135479. Epub 2022 Jun 23.
The removal of various highly toxic heavy metals from wastewater environment is an important task to improve environment. The biosorption potential of cadmium, cobalt and zinc was evaluated using Ulva flexuosa biomass. The impacts of adsorbent dosage, pH of the medium, contact time, and agitation speed were analyzed. The maximum biosorption potential was reached at pH 4.0, 0.4 g initial biosorbent dosage, contact time 40 min and 30 mg/L initial metal concentration for cadmium, while the other factors were similar to zinc, except 35 min contact time (p < 0.01). The optimum absorption was pH 4, 0.6% adsorbent dosage, after 30 min contact time with the heavy metals and 40 mg/L cobalt concentration. Heavy metal removal efficiency was 94.8 ± 3.3%, 87.5 ± 2.3%, and 90.8 ± 1.4%, for cadmium, cobalt, and zinc, respectively (p < 0.01). The Langmuir constant (R) was 0.980 for cadmium, 0.838 for cobalt and it was 0.718 for zinc. The present results revealed that the selected acid modified biomass was highly suitable for the adsorption of metal ions such as, Cd, Co and Zn. The present work revealed the potential application of algal biomass for the removal of various heavy metals from the environment.
从废水环境中去除各种高毒性重金属是改善环境的一项重要任务。使用皱叶酸模生物质评估了镉、钴和锌的生物吸附潜力。分析了吸附剂用量、介质 pH、接触时间和搅拌速度的影响。在 pH 4.0、初始生物吸附剂用量 0.4 g、接触时间 40 min 和初始金属浓度 30 mg/L 的条件下，达到了最大的生物吸附潜力，而其他因素与锌相似，除了接触时间为 35 min（p<0.01）。最佳吸收条件为 pH 4、吸附剂用量 0.6%、接触时间 30 min，重金属和 40 mg/L 钴浓度。重金属去除效率分别为 94.8±3.3%、87.5±2.3%和 90.8±1.4%（p<0.01）。镉的朗缪尔常数（R）为 0.980，钴的为 0.838，锌的为 0.718。本研究结果表明，所选酸改性生物质非常适合吸附 Cd、Co 和 Zn 等金属离子。本工作揭示了藻类生物质在去除环境中各种重金属方面的潜在应用。
