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锐钛矿光电子强化黑曲霉吸附铅离子实验研究
An experimental study of the adsorption of lead ions by Aspergillus niger enhanced by photoelectric of anatase
投稿时间:2017-08-30  修订日期:2017-09-30
中文关键词:锐钛矿  光电子  黑曲霉    吸附
英文关键词:anatase  photoelectron  Aspergillus niger  lead  adsorption
基金项目:国家重点基础研究规划("973"项目)(2014CB846003);国家自然科学基金项目(41672332,41230103)
作者单位E-mail
丁杨 造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 矿物环境功能北京市重点实验室, 北京 100871  
郝瑞霞 造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 矿物环境功能北京市重点实验室, 北京 100871 rxhao@pku.edu.cn 
任桂平 造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 矿物环境功能北京市重点实验室, 北京 100871  
王明粲 造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 矿物环境功能北京市重点实验室, 北京 100871  
鲁安怀 造山带与地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 矿物环境功能北京市重点实验室, 北京 100871  
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中文摘要:
      伴随环境污染问题日益加剧,借助半导体材料实现光能的光电转化在催化及环境领域引起广泛关注。本文借助电化学方法快速高效地合成不同沉积时间纳米赤铁矿薄膜电极。X射线衍射(XRD)、Raman光谱测试表明其成分为赤铁矿物相;原子力显微镜(AFM)观测颗粒尺寸约52.1(±1.48) nm×50.5(±1.49) nm,表面高度起伏分布于70~100 nm,且分布特征符合正态分布规律。紫外可见漫反射吸收谱显示电极可显著吸收350~600 nm波长范围可见光,计算得禁带宽度约2.0~2.1 eV。光电化学实验光电流密度-时间曲线及电流-电压曲线表明电极有良好的可见光光电催化活性,且反应符合Langmuir-Hinshelwood多相反应动力学模型。进一步选取效果较显著的沉积时间10 min电极研究其光电催化降解苯酚活性,0.65 V vs.SCE (饱和甘汞电极)恒电势光照条件下6 h苯酚降解率达62%,拟合一级动力学反应模型可知,反应速率常数k为0.16 h-1R2=0.996)。综上,本文研究结果显示电化学法简单高效合成的纳米赤铁矿具有良好半导体性能且能够可见光光电催化降解苯酚等有机污染物。
英文摘要:
      Lead is widely distributed in nature, and its soluble salts have great toxicity to animals, plants and human bodies. The removal of lead pollution in the environment by biological remediation such as fungi has becomes one of the hot topics. In this paper, the anatase electrode was synthesized using sol-gel method, and characterized by X ray diffraction (XRD), the Raman, environmental scanning electron microscopy (ESEM) and electrochemical testing. The light-semiconductor mineral-microbial system was successfully constructed with anatase electrode and Aspergillus niger Bpb1. The effect of photoelectron on adsorption of lead ions by Aspergillus niger was studied. The experimental results showed that the adsorption rate of the experimental group increased by 33.6% on average with the highest being 42% compared with the control group. The photoelectron did not affect the morphology of lead minerals. Combined with energy spectrum test and previous literature, the authors found that lead ions were combined with organic acids to form minerals with organic lead salts, which were twined in hyphae. In this study, the anatase photoelectron could enhance the adsorption rate of lead ion by fungi, but did not affect its morphology.
丁杨,郝瑞霞,任桂平,王明粲,鲁安怀,2017,锐钛矿光电子强化黑曲霉吸附铅离子实验研究[J].岩石矿物学杂志,36(6):833~841.
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