Water Pollution Research Department, National Research Centre, 33 El Bohouth St, Dokki, Giza, 12622, Egypt.
Department of Chemistry, College of Sciences and Arts at Khulais, University of Jeddah, Jeddah, Saudi Arabia.
Environ Sci Pollut Res Int. 2020 Jun;27(17):21777-21789. doi: 10.1007/s11356-020-08550-5. Epub 2020 Apr 12.
This is the first study on the biosorption of Cu and reactive yellow 145 (RY145) dye by citric acid (CA), NaOH, and heat-treated Chlorella vulgaris (Cv). Influence of contact time, initial adsorptive concentration, and biomass dosage on the biosorption process was explored. The biosorption kinetics and isotherm were comprehensively investigated as well. The Fourier transform infrared analysis proved the successful insertion of carbonyl groups on Cv surface by CA modification and the intensification of all Cv functional groups by heat treatment. CA modified Cv was the best biosorbent for RY145, 0.5 g/L removes 97% of 10 mg/L solution (pH 2) in 40 min. The biosorption was favorable, occurred via the formation of a monolayer of RY145 on the homogenous surface of CA-modified Cv and followed the pseudo-second-order kinetics. On the other hand, heat-treated Cv was the best biosorbent for Cu, 0.5 g/L removes 92% of 10 mg/L solution (pH 5) in 5 min. The biosorption of Cu on heat-treated Cv was complex and involves more than one mechanism. The Langmuir theoretical monolayer saturation capacity of RY145 on CA-modified Cv was comparable to other biosorbents, while that of Cu on heat-treated Cv was drastically superior.
这是首次研究柠檬酸 (CA)、NaOH 和热处理的普通小球藻 (Cv) 对 Cu 和活性黄 145 (RY145) 染料的生物吸附。考察了接触时间、初始吸附浓度和生物质剂量对生物吸附过程的影响。还综合研究了生物吸附动力学和等温线。傅里叶变换红外分析证明了 CA 修饰成功地在 Cv 表面插入了羰基基团，并且热处理增强了所有 Cv 官能团。CA 改性的 Cv 是 RY145 的最佳生物吸附剂，0.5 g/L 在 40 分钟内可去除 10 mg/L 溶液（pH 2）中的 97%。生物吸附是有利的，通过在 CA 改性的 Cv 的均匀表面上形成 RY145 的单层来发生，并且符合伪二阶动力学。另一方面，热处理的 Cv 是 Cu 的最佳生物吸附剂，0.5 g/L 在 5 分钟内可去除 10 mg/L 溶液（pH 5）中的 92%。Cu 在热处理的 Cv 上的生物吸附很复杂，涉及多种机制。CA 改性的 Cv 上 RY145 的 Langmuir 理论单层饱和容量与其他生物吸附剂相当，而 Cu 在热处理的 Cv 上的饱和容量则明显更高。
