文献类型：期刊文献

英文题名：Extremely Effective Removal of U(Vi) from Aqueous Solution by 3d Flower-Like Calcium Phosphate Synthesized Using Mussel Shells and Rice Bran

作者：Zhu, Yuling[1]; Liu, Yuxin[1]; Xu, Ziyi[1]; Xia, Chuanjin[1]; Hu, Baowei[1]; Zeng, Wentao[1]

机构：[1] School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220450720)

语种：英文

外文关键词：Calcium phosphate - Dissolution - Hydroxyapatite - Molluscs - Monolayers - Uranium dioxide - Wastewater treatment

外文摘要：In the current investigation, three calcium phosphate (CaP) chemicals were synthesized using mussel shells and rice bran. Surprisingly, 3D flower-like CaP-5 and CaP-2.5 consisted of CaHPO4 demonstrated extremely better UO22+ removal performance than CaP-N containing hydroxyapatite (Ca5(PO4)3(OH)). UO22+ removal amount of 2140.40, 1951.97 and 352.31 mg?g-1 were obtained for CaP-5, CaP-2.5, and CaP-N, respectively. The higher capacity for UO22+ adsorption by CaP-5 and Ca-2.5 are likely due to CaHPO4, which is instrumental in binding UO22+. Kinetic fitting showed the adsorption reaction followed the pseudo-first-order model at low UO22+ concentrations, but the pseudo-second-order model at high concentrations. Meanwhile, the adsorption data fitted the Langmuir model better, demonstrating the adsorption process was monolayer and uniform. The adsorption mechanisms were investigated via SEM, XRD, FT-IR, XPS, dissolution-precipitation, and pH change. It is first found that at pH 3.0 or 4.0, Ca2+ and H2PO4- were released from CaP-5 and then reacted with UO22+ to form a new substance Ca(UO2)2(PO4)2(H2O)6, which was captured by CaP-5 again, resulting in an extremely high U(VI) removal efficiency. The unexpected finding not only represents a promising effective material for the treatment of uranium-containing wastewater, but also provides a new method for the rational utilization of bio-waste. ? 2022, The Authors. All rights reserved.