Peng Yang, Zhang Chuxuan, Li Xiaomin, Feng Tianyi, Gong Xun
School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, No. 1, Daxue Road, Xuzhou 221116, China.
Department of Electrical Engineering, Xi'an University of Technology, Xi'an 710054, China.
Polymers (Basel). 2024 Dec 10;16(24):3454. doi: 10.3390/polym16243454.
Adsorption is one of the most promising strategies for heavy metal removal. For Hg(II) removal, mineralized Ca-based shell-type self-assembly beads (MCABs) using alginate as organic polymer template were synthesized in this work. The adsorbent preparation consists of gelation of a Ca-based spherical polymer template (CAB) and rate-controlled self-assembly mineralization in bicarbonate solution with various concentrations. The comparative study demonstrates that 1% (MCAB-1) is the optimal concentration of bicarbonate. Based on this condition, the maximum adsorption capacity (48 ± 4 mg/g) of MCAB-1 was observed at pH = 5 in a batch test, which was 2.67 times more than that of the unmodified one, CAB, at 18 ± 1 mg/g. Long-duration (10 h) adsorption tests showed that MCAB-1 exhibited remarkable performance stability and anti-wear ability (43.2% removal efficiency and 74.3% mass retention, compared to 2.7% and 38.6% for CAB at pH = 3, respectively). The morphology determination showed that a shell-type porous amorphous carbonate layer was formed at the surface of the organic polymer template by rate-controlled self-assembly mineralization. This transition not only promotes the pore structure and activated cation binding functional sites, but also improves the anti-wear ability of materials effectively.
吸附是去除重金属最具前景的策略之一。在本研究中，以藻酸盐为有机聚合物模板，合成了用于去除汞（II）的矿化钙基壳型自组装珠粒（MCABs）。吸附剂的制备包括钙基球形聚合物模板（CAB）的凝胶化以及在不同浓度碳酸氢盐溶液中的速率控制自组装矿化。对比研究表明，1%（MCAB - 1）是碳酸氢盐的最佳浓度。在此条件下，批次试验中在pH = 5时观察到MCAB - 1的最大吸附容量为（48 ± 4 mg/g），是未改性的CAB（18 ± 1 mg/g）的2.67倍。长时间（10小时）吸附试验表明，MCAB - 1表现出显著的性能稳定性和抗磨损能力（去除效率为43.2%，质量保留率为74.3%，相比之下，在pH = 3时CAB的去除效率为2.7%，质量保留率为38.6%）。形态测定表明，通过速率控制自组装矿化在有机聚合物模板表面形成了壳型多孔无定形碳酸盐层。这种转变不仅促进了孔隙结构和活性阳离子结合功能位点，还有效提高了材料的抗磨损能力。
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