Department of Bioprocess Development, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications, Alexandria, Egypt.
Department of Microbial Biotechnology, Genetic Engineering and Biotechnology Research Institute, University of Sadat City, 22857, Menoufyia Governorate, Egypt.
Sci Rep. 2018 Aug 20;8(1):12456. doi: 10.1038/s41598-018-30855-2.
Cadmium is a global heavy metal pollutant. Marine green algae were used as efficient, low cost and eco-friendly biosorbent for cadmium ions removal from aqueous solutions. Plackett-Burman design was applied to determine the most significant factors for maximum cadmium removal from aqueous solutions using dry Ulva fasciata biomass. The most significant factors affecting cadmium removal process were further optimized by the face centered central composite design. The results indicated that 4 g of dry Ulva fasciata biomass was found to successfully remove 99.96% of cadmium from aqueous solution under the conditions of 200 mg/L of initial cadmium concentration at pH 5, 25 °C for 60 min of contact time with static condition. Dry Ulva fasciata biomass samples before and after cadmium biosorption were analyzed using SEM, EDS and FTIR. Furthermore, the immobilized biomass in sodium alginate-beads removed 99.98% of cadmium from aqueous solution at an initial concentration of 200 mg/L after 4 h which is significantly higher than that for control using sodium alginate beads without incorporation of the algal biomass (98.19%). Dry biomass of Ulva fasciata was proven to be cost-effective and efficient to eliminate heavy metals especially cadmium from aquatic effluents and the process is feasible, reliable and eco-friendly.
镉是一种全球性的重金属污染物。海洋绿藻作为一种高效、低成本和环保的生物吸附剂，可用于从水溶液中去除镉离子。采用 Plackett-Burman 设计来确定使用干燥的石莼生物质从水溶液中去除镉的最大去除率的最显著因素。通过面心中央复合设计进一步优化了影响镉去除过程的最显著因素。结果表明，在初始镉浓度为 200mg/L、pH 值为 5、接触时间为 60min、静态条件下，4g 干燥的石莼生物质可成功从水溶液中去除 99.96%的镉。使用 SEM、EDS 和 FTIR 分析了镉生物吸附前后的干燥石莼生物质样品。此外，在初始浓度为 200mg/L 的条件下，固定在海藻酸钠珠中的生物质 4 小时后可去除 99.98%的镉，明显高于未加入藻生物质的海藻酸钠珠（98.19%）的去除率。石莼的干燥生物量被证明是从水废水中有效去除重金属（尤其是镉）的经济高效方法，该过程可行、可靠且环保。
