吸附
化学
水溶液中的金属离子
水溶液
甲醛
肿胀 的
金属
尿素
离子交换
核化学
化学工程
色谱法
离子
有机化学
工程类
作者
Ping Qu,Yuncong Li,Hongying Huang,Jianjun Chen,Zebin Yu,Jun Huang,Hailong Wang,Bin Gao
标识
DOI:10.1016/j.jhazmat.2020.122664
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∼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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