期刊
APPLIED SCIENCES-BASEL
卷 12, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/app12115334
关键词
phosphate; natural zeolite; biochar; composite; co-pyrolysis
类别
资金
- National Key Research and Development Program of China [2018YFC1802601]
- Opening Fund of the State Key Laboratory of Environmental Geochemistry [SKLEG 2022216]
- Institute of Geochemistry, Chinese Academy of Sciences
- Light of West China Program
This study investigates the adsorption performance and regulation mechanisms of a zeolite-biochar composite for removing phosphate from water. The findings show that the composite material has a high adsorption capacity for phosphate removal through the formation of amorphous calcium-magnesium phosphate compounds via ligand exchange.
Recently, rampant eutrophication induced by phosphorus enrichment in water has been attracting attention worldwide. However, the mechanisms by which phosphate can be eliminated from the aqueous environment remain unclear. This study was aimed at investigating the adsorption performance and regulation mechanisms of the zeolite-biochar composite for removing phosphate from an aqueous environment. To do this, physicochemical properties of the zeolite-biochar composite were assessed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) specific surface area (SSA) analyzer, and transmission electron microscopy (TEM). Adsorption tests were performed to evaluate the adsorption ability of the composite material for mitigating excess phosphorus in the aqueous environment. The findings evinced that the phosphorus removed by PZC 7:3 (pyrolyzed zeolite and corn straw at a mass ratio of 7:3) can reach 90% of that removed by biochar. The maximum adsorption capacities of zeolite, biochar, and PZC 7:3 were 0.69, 3.60, and 2.41 mg/g, respectively. The main mechanism of phosphate removal by PZC 7:3 was the formation of thin-film amorphous calcium-magnesium phosphate compounds through ligand exchange. This study suggests that PZC 7:3 is a viable adsorbent for the removal of phosphate from aquatic systems.
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