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Bioadsorbents from algae residues for heavy metal ions adsorption: chemical modification, adsorption behaviour and mechanism
Environmental Technology ( IF 2.8 ) Pub Date : 2020-03-02 , DOI: 10.1080/09593330.2020.1723711
Rongguo Li 1 , Tingting Zhang 1 , Haifeng Zhong 1 , Weikang Song 1 , You Zhou 1 , Xueqiong Yin 1
Affiliation  

ABSTRACT

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 Sargassum carpophyllum residue (SCR) and green seaweed Caulerpa lentillifera 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 Cu2+, Pb2+, Cd2+ and Mn2+ 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.



中文翻译:

用于重金属离子吸附的藻类残留生物吸附剂:化学改性、吸附行为和机理

摘要

生物吸附是一种新兴技术,用于通过天然或改性生物质去除工业废水中的重金属。在这项研究中,我们提出了一种充分利用海藻的新方案。提取生物活性多糖后得到褐海藻马尾藻残留物(SCR)和绿海藻小扁豆残留物(CLR)。所得残基用丁二酸酐进一步化学改性,得到各自的羧化产物,命名为CSCR和CCLR。根据滴定结果,CSCR 和 CCLR 分别含有 2.77 和 2.12 mmol/g 的羧基。改性后对金属离子的吸附能力提高了3-6倍。CSCR对Cu 2+ , Pb 2+的吸附能力、Cd 2+和Mn 2+分别为52.37、107.11、85.62和43.52mg/g,CCLR分别为78.10、108.80、87.30和57.80mg/g。拟二级动力学模型和朗缪尔吸附等温线方程很好地描述了吸附过程。

更新日期:2020-03-02
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