文献类型：期刊文献

英文题名：Engineering of phosphate-functionalized biochars with highly developed surface area and porosity for efficient and selective extraction of uranium

作者：Hu, Rui[1,2] Xiao, Jiang[3] Wang, Tianhui[1,2] Chen, Guangcai[3] Chen, Lin[1,2] Tian, Xingyou[1,2]

第一作者：Hu, Rui

通信作者：Hu, R[1];Chen, GC[1]|[a000551c9abd7c3960d59]陈光才;

机构：[1]Chinese Acad Sci, Inst Appl Technol, Hefei Inst Phys Sci, Hefei 230088, Anhui, Peoples R China;[2]Chinese Acad Sci, CAS Key Lab Photovolta & Energy Conservat Mat, Hefei 230031, Anhui, Peoples R China;[3]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China

年份：2020

卷号：379

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20193207275132);Scopus(收录号：2-s2.0-85070061878);WOS:【SCI-EXPANDED(收录号:WOS:000494799900138)】；

基金：This work was supported in part by the CAS Pioneer Hundred Talents Program, China, the CASHIPS Director's Fund, China (Grant No. YZJJ2018QN20), the National Natural Science Foundation of China (No. 21875257), the Key Research and Development Program of Zhejiang Province, China (No. 2018C03047), and China Postdoctoral Science Foundation (No. 2018M640200).

语种：英文

外文关键词：Phosphate functionalized biochar; Phytic acid; Porosity regulation; Efficient sorption; U(VI)

摘要：Properly engineering of surface functionality and structural porosity is critical to improve the sorption performance of biochars. Herein, we report a facile one-pot preparation of phosphate group-functionalized biochars (PBs) derived from bamboo sawdust by engineering with physic acid prior to pyrolysis. High specific surface areas (629, 1298 and 1109 m(2).g(-1)), large pore volumes (0.332, 0.919 and 0.789 cm(3).g(-1)), and abundant phosphorous contents (1.14, 3.32 and 1.53 at. %) are achieved compatibly for the PBs pyrolyzed at given temperatures (i.e., 300, 450 and 600 degrees C) which are significantly higher than those of pristine biochars. Phytic acid not only releases hydrogen protons to tailor biochar matrixes to make micropores created and further developed, but also provides organic phosphorous-containing moiety to guarantee the surface phosphate functionality. PBs extract U(VI) from aqueous media efficiently, i.e., equilibrium achieved within 8 h, high sorption capacity of 229.2 mg.g(-1) (at pH 4.0, T 298 K), and favorable selectivity towards U(VI) against the interference of coexisting metal ions. PBs can be regenerated by 0.1 mol.l(-1) Na2CO3 and reused well after six recycles. This present work provides a path for the design and synthesis of advanced biochars with favorable potentials in the extraction of U (VI)-containing effluents.