Zigui Ecological Station for Three Gorges Dam Project, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China; Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), 705 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012 USA; College of Resource and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China; Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), 705 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012 USA.
J Hazard Mater. 2020 Feb 15;384:121258. doi: 10.1016/j.jhazmat.2019.121258. Epub 2019 Sep 19.
An innovative advanced oxidation process was successfully developed to photocatalytic-degradation of estrone through the synergistic effect of biochar and Bi/BiO in bismuth-containing photocatalytic biochar (BiPB). The highest reaction rate constant (k) of estrone degradation by BiPB was 0.045 min under the conditions of initial concentration of estrone =10.4 μmol L, [BiPB] =1 g L, pH = 7.0. The k was almost tenfold and more than 20 times than that of biochar without bismuth impregnation and pristine Bi/BiO, respectively. The best photocatalytic performance of BiPB composites for the degradation of estrone was primarily attributed to generation of OH radicals. Impregnation of bismuth helped control the concentration of persistent free radicals (PFRs) and develop a hierarchical porous structure of biochar. The presence of biochar facilitated pre-concentration estrone on BiPB and improved the separation and transfer efficiency of charge carriers. The synergistic effect between biochar and Bi/BiO contributed to the generation of OH radicals for estrone degradation under neutral pH conditions. The transformation pathway of estrone was also proposed based on the measured transformation products in the presence of BiPB. The high efficiency of BiPB composites indicated that this easily-obtained material was promising for estrone-wastewater treatment applications as a low-cost composite photocatalyst.
一种创新的高级氧化工艺通过生物炭和含铋光催化生物炭（BiPB）中的 Bi/BiO 的协同作用成功开发用于雌酮的光催化降解。在雌酮初始浓度=10.4 μmol L、[BiPB]=1 g L、pH=7.0 的条件下，BiPB 对雌酮降解的最高反应速率常数（k）为 0.045 min。k 分别是无铋浸渍生物炭和原始 Bi/BiO 的十倍和二十多倍。BiPB 复合材料对雌酮降解的最佳光催化性能主要归因于 OH 自由基的生成。铋的浸渍有助于控制持久自由基（PFRs）的浓度并开发生物炭的分级多孔结构。生物炭的存在有利于在 BiPB 上预浓缩雌酮，并提高载流子的分离和转移效率。生物炭和 Bi/BiO 之间的协同作用有助于在中性 pH 条件下生成 OH 自由基以降解雌酮。还根据在 BiPB 存在下测量的转化产物提出了雌酮的转化途径。BiPB 复合材料的高效率表明，这种易于获得的材料作为一种低成本复合光催化剂，有望用于雌酮废水处理应用。
