Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 53, Pages 81063-81075Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-21564-5
Keywords
Hydroxyapatite; Adsorption; Strontium-doped; Lead ions; Mechanism
Categories
Funding
- National Natural Science Foundation of China [51978188, 42063003, 52160017]
- Guangxi Natural Science Foundation [2018GXNSFAA050044]
- Special Fund for Guangxi Distinguished Experts
- Program for High Level Innovation Team and Outstanding Scholar of Universities in Guangxi [GuiCaiJiaoHan [2018] 319]
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In this study, strontium-doped hydroxyapatite (Sr-HAP) was synthesized and found to have higher adsorption capacity for lead ions. Increasing the dosage and temperature enhanced the adsorption capacity. Sr-HAP had increased specific surface area and more uniform pore size distribution, making it an ideal adsorbent for removing lead ions from wastewater.
In this study, a strontium-doped hydroxyapatite (Sr-HAP) was synthesized by the solgel method, which was used as adsorbent to remove lead ions (Pb2+) from water. The results showed that the adsorption capacities of the Sr-HAP were obviously higher than those of the HAP, the adsorption capacities of which for Pb2+ reached 651.175 mg/g. The proper increasement in the dosage of adsorbent was beneficial to the removal of Pb2+ by Sr-HAP. Meanwhile Sr-HAP had a wide applicable pH range for Pb2+. And the increasement in temperature could increase the adsorption capacity of Sr-HAP for Pb2+ to a certain extent. The Langmuir model was used to fit the isotherm adsorption process of Sr-HAP to Pb2+ in water. Compared with HAP, the specific surface area of Sr-HAP has increased by 11.1%, and the pore size distribution of Sr-HAP tended to be smaller and more uniform. Hence, Sr-HAP could be used as an ideal adsorbent to remove Pb2+ in wastewater.
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