Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, People's Republic of China.
Environ Technol. 2021 Aug;42(20):3132-3143. doi: 10.1080/09593330.2020.1723711. Epub 2020 Mar 2.
Biosorption is an emerging technology for the removal of heavy metals from industrial wastewater by natural or modified biomass. In this study, we proposed a novel protocol for making full use of seaweeds. Brown seaweed residue (SCR) and green seaweed residue (CLR) were obtained after extraction of the bioactive polysaccharides. The obtained residues were further chemical modified by butanedioic anhydride to obtained respective carboxylated product, named CSCR and CCLR. According to the titration results, CSCR and CCLR contained 2.77 and 2.12 mmol/g of carboxyl group. After modification, the adsorption capacity for metal ions increased by 3-6 times. The adsorption capacity of CSCR for Cu, Pb, Cd and Mn was 52.37, 107.11, 85.62, and 43.52 mg/g, and that of CCLR was 78.10, 108.80, 87.30 and 57.80 mg/g, respectively. The adsorption was well described by the pseudo-second-order kinetic model and Langmuir adsorption isotherm equation.
生物吸附是一种新兴的技术，可通过天然或改性生物质从工业废水中去除重金属。在这项研究中，我们提出了一种充分利用海藻的新方案。在提取生物活性多糖后，得到了褐色海藻残渣（SCR）和绿色海藻残渣（CLR）。所得残渣进一步用丁二酸酐化学改性，得到相应的羧化产物，分别命名为 CSCR 和 CCLR。根据滴定结果，CSCR 和 CCLR 分别含有 2.77 和 2.12mmol/g 的羧基。改性后，对金属离子的吸附能力增加了 3-6 倍。CSCR 对 Cu、Pb、Cd 和 Mn 的吸附容量分别为 52.37、107.11、85.62 和 43.52mg/g，CCLR 对 Cu、Pb、Cd 和 Mn 的吸附容量分别为 78.10、108.80、87.30 和 57.80mg/g。吸附过程很好地符合准二级动力学模型和 Langmuir 吸附等温方程。
