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Urea formaldehyde modified alginate beads with improved stability and enhanced removal of Pb2+, Cd2+, and Cu2+

文献类型： 外文期刊

作者： Qu, Ping 1 ; Li, Yuncong 4 ; Huang, Hongying 1 ; Chen, Jianjun 5 ; Yu, Zebin 6 ; Huang, Jun 7 ; Wang, Hailong 9 ; Gao, Bi 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Key Lab Crop & Livestock Integrated Farming, Minist Agr, Recycling Agr Res Ctr, Nanjing, Peoples R China

2.Jiangsu Collaborat Innovat Ctr Solid Organ Waste, Nanjing 210014, Jiangsu, Peoples R China

3.Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32606 USA

4.Univ Florida, Soil & Water Sci Dept, Trop Res & Educ Ctr, Homestead, FL 33031 USA

5.Univ Florida, Mid Florida Res & Educ Ctr, Apopka, FL 32703 USA

6.Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China

7.Hualan Design & Consulting Grp Co Ltd, Nanning 530011, Peoples R China

8.Guangxi Univ, Coll Civil Engn & Architecture, Nanning 530004, Peoples R China

9.Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

10.Zhejiang A&F Univ, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China

关键词： Sodium alginate; Pb(II); Cu(II); Cd(II); adsorption mechanisms

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2020 年 396 卷

页码：

收录情况： SCI

摘要： Urea formaldehyde (UF) was grafted onto the backbone of alginate to prepare microbeads as an adsorbent for the removal of heavy metal ions from aqueous solutions. The expensive alginate was crosslinked with cheaper UF at different ratios (1: 2.5 similar to 1: 12.5) to produce sturdy alginate-UF beads at lower cost. Characterization results showed that UF modification enhanced the pore network and structural stability of the beads, which can be attributed to the reduced intermolecular forces and plentiful of nitrogen and oxygen donor atoms of the beads. The swelling of air-dried alginate-UF beads in different solutions was much lower than that of the unmodified alginate beads, confirming the improved stability. The replacement of alginate with UF at different ratios either did not affect or increased the adsorption of heavy metal ions (Pb2+, Cd2+, and Cu2+) on the beads. For example, the adsorption capacities of Pb2+, Cd2+, and Cu2+ on air-dried alginate-UF (1: 2.5) beads were 1.66, 0.61, and 0.80 mmol/g, which were 39.88%, 9.29%, and 9.52% higher than those of the corresponding unmodified alginate beads, respectively. The adsorption of heavy metals on the alginate-UF beads was mainly controlled by ion exchange, complexation, and electrostatic interaction mechanisms.

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