Dual‐surface capped hydroxyapatite nano‐amendment with tuned alternate long‐short chain configuration for efficient adsorption towards multi‐heavy metal ions in complex‐contaminated systems
Mochou GAO, Shan MENG, Jinzhong ZHANG, Wenhua FENG, Shuo DONG, Jianping CHEN, Yanbao ZHAO, Laigui YU, Rongrong YING, Xueyan ZOU
【无机化学学报】doi: 10.11862/CJIC.20240431
Hydroxyapatite nanoparticles (HAP NPs) were synthesized by a one‐step hydrothermal method. The surface of HAP NPs was grafted —SH and —COOH chelating groups via in situ surface‐modification with iminodiacetic acid (IDA) and 3‐mercaptopropyl trimethoxysilane (MPS) to afford dual surface‐capped nano‐amendment HAP‐IDA/MPS. The structure of HAP‐IDA/MPS was characterized, and its adsorption performance for Hg2+, Cu2+, Zn2+, Ni2+, Co2+, and Cd2+ was evaluated. The total adsorption capacity of 0.10 g HAP‐IDA/MPS nano‐amendment for Hg2+, Cu2+, Zn2+, Ni2+, Co2+, and Cd2+ with an initial mass concentration of 20 mg·L-1 reached 13.7 mg·g-1, about 4.3 times as much as that of HAP. Notably, HAP‐IDA/MPS nano‐amendment displayed the highest immobilization rate for Hg2+, possibly because of its chemical reaction with —SH to form sulfide, possessing the lowest solubility product constant among a variety of metal sulfides.
关键词: heavy metal, hydroxyapatite, nano‐amendment, configuration tuning, synergistic adsorption

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