Department of Bioprocess Development, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), Alexandria, 21934, Egypt.
Sci Rep. 2020 Oct 15;10(1):17439. doi: 10.1038/s41598-020-74389-y.
The pollution of water by heavy metal ions and dyes, particularly from industrial effluents, has become a global environmental issue. Therefore, the treatment of wastewater generated from different industrial wastes is essential to restore environmental quality. The efficiency of Gracilaria seaweed biomass as a sustainable biosorbent for simultaneous bioremoval of Ni and methylene blue from aqueous solution was studied. Optimization of the biosorption process parameters was performed using face-centered central composite design (FCCCD). The highest bioremoval percentages of Ni and methylene blue were 97.53% and 94.86%; respectively, obtained under optimum experimental conditions: 6 g/L Gracilaria biomass, initial pH 8, 20 mg/L of methylene blue, 150 mg/L of Ni and 180 min of contact time. Fourier Transform Infrared Spectroscopy (FTIR) spectra demonstrated the presence of methyl, alkynes, amide, phenolic, carbonyl, nitrile and phosphate groups which are important binding sites involved in Ni and methylene blue biosorption process. SEM analysis reveals the appearance of shiny large particles and layers on the biosorbent surface after biosorption that are absent before the biosorption process. In conclusion, it is demonstrated that the Gracilaria seaweed biomass is a promising, biodegradable, ecofriendly, cost-effective and efficient biosorbent for simultaneous bioremoval of Ni and methylene blue from wastewater effluents.
水体受到重金属离子和染料的污染，尤其是来自工业废水的污染，已成为全球性的环境问题。因此，处理来自不同工业废物的废水对于恢复环境质量至关重要。本研究旨在探讨江蓠海藻生物质作为一种可持续的生物吸附剂，同时从水溶液中去除 Ni 和亚甲基蓝的效率。采用中心复合面设计（FCCCD）对生物吸附过程的参数进行了优化。在最佳实验条件下（6 g/L 江蓠生物质、初始 pH 值 8、20 mg/L 亚甲基蓝、150 mg/L Ni 和 180 min 接触时间），Ni 和亚甲基蓝的最大去除率分别为 97.53%和 94.86%。傅里叶变换红外光谱（FTIR）谱图表明，存在甲基、炔、酰胺、酚、羰基、腈和磷酸盐基团，这些基团是参与 Ni 和亚甲基蓝生物吸附过程的重要结合位点。SEM 分析表明，生物吸附后生物吸附剂表面出现了闪亮的大颗粒和层状结构，而在生物吸附之前这些结构并不存在。总之，研究结果表明，江蓠海藻生物质是一种很有前途的、可生物降解的、环保的、经济高效的生物吸附剂，可用于同时从废水中去除 Ni 和亚甲基蓝。
