Inorganic Chemicals Industry >
Hydroxyapatite composite humic acid and its removal of Mn（Ⅱ）
Received date: 2023-06-20
Online published: 2024-05-15
Hydroxyapatite（HAP） was successfully synthesized by chemical precipitation method using calcium nitrate and ammonium hydrogen phosphate as raw materials，and HAP-HA composite adsorbent was prepared by combining HAP with humic acid（HA）.The samples were characterized by Fourier transform infrared spectroscopy（FT-IR），specific surface area and pore size analysis，differential thermal-thermogravimetric analysis（TG-DSC） and scanning electron microscopy（SEM）.The results showed that humic acid was successfully loaded onto hydroxyapatite.The pore size of HAP-HA was mainly distributed in 3~5 nm，the specific surface area was large，and it had good stability.The surface of HAP-HA was rough and porous，which increased the specific surface area and provided a large number of active sites for heavy metal ions.Taking Mn（Ⅱ） as the target pollutant and the removal rate of Mn（Ⅱ） as the index，the adsorption performance of HAP-HA on pollutants was investigated by adsorption experiments.The results showed that the removal rate of Mn（Ⅱ） by HAP-HA was the highest at room temperature，pH of 8.0，dosage of 0.15 g and adsorption time of 150 min，which could reach more than 99.0%.The adsorption process conformed to the Freundlich isothermal adsorption model.At the same time，the desorption and regeneration adsorption experiments were carried out on the adsorbent after the adsorption experiment.The NaOH solution was used as the eluent to obtain better desorption effect，and the desorption efficiency could reach 78.1%.HAP-HA still had good adsorption performance after 6 regeneration cycles.
Key words： hydroxyapatite; humic acid; adsorbent; Mn（Ⅱ）
PEI Xiaogang , ZHANG Peng , DONG Shanshan , GE Shanshan , ZHAO Yuelong . Hydroxyapatite composite humic acid and its removal of Mn（Ⅱ）[J]. Inorganic Chemicals Industry, 2024 , 56(5) : 70 -77 . DOI: 10.19964/j.issn.1006-4990.2023-0335
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