锐钛矿光电子强化黑曲霉吸附铅离子实验研究
发布时间：2018-11-11 17:42
【摘要】：铅元素在自然界分布广泛,其可溶性盐对动植物及人体有巨大毒性,借助真菌等生物修复技术手段清除环境中铅污染逐渐成为研究热点之一。本文使用溶胶凝胶法合成了锐钛矿电极,通过X射线衍射(XRD)、拉曼测试、环境扫描电镜和电化学测试等对其进行了系统表征,进而联合实验室分离筛选出的一株黑曲霉Aspergillus niger Bpb1成功构建了光-半导体矿物-微生物系统。研究了光电子对黑曲霉吸附铅离子的影响,实验结果表明锐钛矿光电子与黑曲霉协同作用下,实验组较对照组铅离子吸附速率平均增加33.6%,最高增加42%。进一步使用环境扫描电镜观察黑曲霉外部形态,发现光电子不影响铅矿物的形态。结合能谱测试和前人文献得知铅离子与有机酸结合形成以有机铅盐为主的矿物,缠绕在菌丝中。本研究实现了利用光能加速真菌代谢的过程,表明锐钛矿光电子与黑曲霉协同作用只对真菌吸附铅离子速率产生一定的加强,并未影响其成矿形态。
[Abstract]:Lead is widely distributed in nature and its soluble salt has great toxicity to animals and plants and human body. The removal of lead pollution in the environment by means of bioremediation technology such as fungi has gradually become one of the research hotspots. Anatase electrodes were synthesized by sol-gel method and characterized by X-ray diffraction (XRD) (XRD), Raman spectroscopy, environmental scanning electron microscopy (ESEM) and electrochemical measurement. Furthermore, a strain of Aspergillus Niger Aspergillus niger Bpb1 isolated from the laboratory successfully constructed a photo-semiconductor mineral-microbial system. The effect of photoelectron on the adsorption of lead ions by Aspergillus Niger was studied. The experimental results showed that the adsorption rate of lead ions in the experimental group was increased by 33.6g and 42g in comparison with the control group under the synergistic action of anatase photoelectron and Aspergillus Niger. The external morphology of Aspergillus Niger was observed by environmental scanning electron microscope and it was found that photoelectron did not affect the morphology of lead minerals. Combined with energy spectrum measurement and previous literatures, it was found that lead ions bound with organic acids to form minerals dominated by organic lead salts, which wound in hyphae. In this study, the process of accelerating the metabolism of fungi by using light energy was realized. It was shown that the synergistic action of anatase photoelectron and Aspergillus Niger only enhanced the adsorption rate of lead ions by fungi, and did not affect the metallogenic morphology of fungi.
【作者单位】： 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;
【基金】：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)~~
【分类号】：P579;X505
本文编号：2325638
[Abstract]:Lead is widely distributed in nature and its soluble salt has great toxicity to animals and plants and human body. The removal of lead pollution in the environment by means of bioremediation technology such as fungi has gradually become one of the research hotspots. Anatase electrodes were synthesized by sol-gel method and characterized by X-ray diffraction (XRD) (XRD), Raman spectroscopy, environmental scanning electron microscopy (ESEM) and electrochemical measurement. Furthermore, a strain of Aspergillus Niger Aspergillus niger Bpb1 isolated from the laboratory successfully constructed a photo-semiconductor mineral-microbial system. The effect of photoelectron on the adsorption of lead ions by Aspergillus Niger was studied. The experimental results showed that the adsorption rate of lead ions in the experimental group was increased by 33.6g and 42g in comparison with the control group under the synergistic action of anatase photoelectron and Aspergillus Niger. The external morphology of Aspergillus Niger was observed by environmental scanning electron microscope and it was found that photoelectron did not affect the morphology of lead minerals. Combined with energy spectrum measurement and previous literatures, it was found that lead ions bound with organic acids to form minerals dominated by organic lead salts, which wound in hyphae. In this study, the process of accelerating the metabolism of fungi by using light energy was realized. It was shown that the synergistic action of anatase photoelectron and Aspergillus Niger only enhanced the adsorption rate of lead ions by fungi, and did not affect the metallogenic morphology of fungi.
【作者单位】： 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;
【基金】：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)~~
【分类号】：P579;X505
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