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正六月阳光,热辣,闪亮。作物和花草承其德泽,生出灼灼光华。这繁茂的炽烈,闭着眼睛都有炫彩的亮,这就是夏日阳光的王者风范。六月阳光,带来了色彩浓郁到极致的旺盛,六月里诞生的我,感念这火辣阳光赋予的顽强生命力,但还是忍不住悄悄说一点阳光的坏,准确地说,是数落一下赤橙黄绿蓝靛紫的明媚光芒之外, 相似文献
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Ashok Kumar Chakraborty Md Emran Hossain Md Masudur Rhaman K M A Sobahan 《环境科学学报(英文版)》2014,26(2):458-465
A nanoheterojunction composite photocatalyst Bi2O3/TiO2working under visible-light(λ 420 nm) was prepared by combining two semiconductors Bi2O3 and TiO2 varying the Bi2O3/TiO2molar ratio. Maleic acid was employed as an organic binder to unite Bi2O3 and TiO2 nanoparticles. The SEM, TEM, XRD and diffuse reflectance spectra were utilized to characterize the prepared Bi2O3/TiO2nanoheterojunction. The nanocomposite exhibited unusual high photocatalytic activity in decomposing 2-propanol in gas phase and phenol in aqueous phase and, evolution of CO2 under visible light irradiation while the end members exhibited low photocatalytic activity. The composite was optimized to 5 mol% Bi2O3/TiO2. The remarkable high photocatalytic efficiency originates from the unique relative energy band position of Bi2O3 and TiO2 as well as the absorption of visible light by Bi2O3. 相似文献
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Zhiqiao He Liyong Zhan Fangyue Hong Shuang Song Zhengying Lin Jianmeng Chen Mantong Jin 《环境科学学报(英文版)》2011,23(1):166-170
I-doped titanium dioxide nanospheres (I-TNSs) were synthesized via a two-step hydrothermal synthesis route, their potential for the
e cient utilization of visible light was evaluated. The prepared anatase-phase I-TNSs had a bimodal porous size distribution with a
Brunauer-Emmett-Teller surface area of 76 m2/g, a crystallite size of approximately 14 nm calculated from X-ray di raction data, and
a remarkable absorption in the visible light region at wavelengths > 400 nm. The photocatalytic activity of the samples was evaluated
by decoloration of Methyl Orange in aqueous solution under visible light irradiation in comparison to the iodine-doped TiO2 (I-TiO2).
The I-TNSs showed higher photocatalytic e ciency compared with I-TiO2 after irradiation for 180 min even though the latter had a
much greater surface area (115 m2/g). It was concluded that the surface area was not the predominant factor determining photocatalytic
activity, and that the good crystallization and bimodal porous nanosphere structure were favourable for photocatalysis. 相似文献
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Kamaraj M. Ranjith K. S. Rajeshwari Sivaraj Rajendra Kumar R. T. Hasna Abdul Salam 《环境科学学报(英文版)》2014,26(11):2362-2368
Photocatalytic degradation of Bisphenol A (BPA), a representative endocrine disruptor chemical, was carried out under irradiation of sunlight in the presence of CexZn1-xO nanophotocatalyst. Cerium (Ce) ions were successfully incorporated into the bulk lattice of ZnO by simple co-precipitation process. The CexZn1-xO composite nanostructures exhibited higher photocatalytic efficiency than pure ZnO in the degradation of BPA under sunlight irradiation and nearly complete mineralization of BPA was achieved. The degradation rate was strongly dependent on factors such as the size and structure of catalyst, doping material concentration, BPA concentration, catalyst load, irradiation time and pH levels. This work suggested that the CexZn1-xO assisted photocatalytic degradation is a versatile, economic, environmentally benign and efficient method for BPA removal in the aqueous environment. 相似文献
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立足于轮班工作模式,阐述轮班制度对司机疲劳产生与积累的影响。介绍疲劳指数方法和池田公式的理论基础及模型构架,基于北京地铁13号线现行轮班表,分别应用上述两种研究方法进行地铁轮班司机疲劳程度的分析。两种方法的评估结果显著相关,均说明13号线现行轮班表的制定会导致司机疲劳的产生,存在安全运营风险。应用上述方法可实现对司机疲劳程度的非接触式测量,避免对司机驾驶作业的干扰,同时为地铁运营公司的安全管理人员制定合理的轮班方案,建立全面、量化的动态管理措施,提高行车安全保障提供了科学依据。 相似文献
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本文报道了使用FT—620型照射量率仪和高压电离室对四川省不同海拔高度宇宙射线电离成份所致空气吸收剂量率的测量结果。测量水面是四川省的三岔湖(海拨461米);邛海(海拔1510米);泸沽湖(海拔2690米)。根据测量结果经过换算,得出了在一定的地理纬度下,宇宙射线电离成份所致空气吸收剂量率随海拔高度的变化曲线。由此可评价不同海拨高度地区,宇宙射线电离成份所致居民受照剂量和计算陆地r辐射剂量率 相似文献