由吸烟所致~(210)Pb、~(210)Po照射剂量的研究

本文对国外3种名烟、国内畅销47种烟及新疆7种烟进行研究。结果表明:香烟中~(210)Po和~(210)Pb平衡系数为0.801;烟雾中~(210)Po和~(210)Pb比值为1.15,表明烟雾中~(210)Po量比~(210)Pb多;主流烟雾中~(210)Po占整支烟~(210)Po量的12.93％,而~(210)Pb占8.17％;烟咀阻留~(210)Po效率为(52.0±10.7)％,阻留~(210)Pb效率为(58.3±7.2)％;估算了每日吸一盒烟的人,20年肺和支气管剂量当量,约1.38 ×10~(-2)S_v。     

福建福州交通路口用上太阳能自动红绿灯

一种新型环保太阳能自动红绿灯日前出现在福州街头的一些交通路口。这种灯利用太阳能自动控制，不用外接电源，夜间无太阳光照射也能工作，并且安装快捷，便于移动。     

Synthesis of novel CeO2-BiVO4/FAC composites with enhanced visible-light photocatalytic properties

To utilize visible light more effectively in photocatalytic reactions, a fly ash cenosphere （FAC）-supported CeO2-BiV04 （CeO2-BiVO4/FAC） composite photocatalyst was prepared by modified metalorganic decomposition and impregnation methods. The physical and photophysical properties of the composite have been characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and energy dispersive X-ray spectroscopy （EDX）, X-ray photoelectron spectroscopy （XPS）, and UV-Visible diffuse reflectance spectra. The XRD patterns exhibited characteristic diffraction peaks of both BiVO4 and Ce02 crystalline phases. The XPS results showed that Ce was present as both Ce4＋ and Ce3＋ oxidation states in Ce02 and dispersed on the surface of BiV04 to constitute a p-n heterojunction composite. The absorption threshold of the CeO2-BiVO4/FAC composite shifted to a longer wavelength in the UV-Vis absorption spectrum compared to the pure Ce02 and pure BiV04. The composites exhibited enhanced photocatalytic activity for Methylene Blue （MB） degradation under visible light irradiation. It was found that the 7.5 wt.% CeO2-BiVO4/FAC composite showed the highest photocatalytic activity for MB dye wastewater treatment.     

Combination of heterogeneous Fenton-like reaction and photocatalysis using Co-TiO2 nanocatalyst for activation of KHSO5 with visible light irradiation at ambient conditions

A novel coupled system using Co–Ti O2 was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction（SR-Fenton） and visible light photocatalysis（Vis-Photo）, for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50 mg/L Rhodamine B（Rh B） degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the Ti O2 lattice is the reason for the visible light photocatalytic activity of Co–Ti O2. Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability,and almost no dissolution of Co2＋was found.     

成都施用磷肥中镭（^226Ra）含量调查及对农田环境影响评价

本文报道了成都磷肥及其原料矿石中外照射剂量水平；用国家标准规定的方法测定了磷肥及其矿石中＾２２６Ｒａ含量；调查了同一生产厂家不同批号磷肥中＾２２６Ｒａ含量变化情况；估算出施用磷肥后可能带来的放射性环境污染，并对磷肥中＾２２６Ｒａ可能导致的农田环境影响作了简要评价? ?     

TiO2薄膜超亲水性的研究进展

TiO2薄膜在紫外、光照射下所表现出来的超亲水性得到了国内外许多科学工作者的广泛关注。简要介绍了TiO2薄膜材料的超亲水机理、制备方法及应用发展等，指出了目前存在的问题并简单评述了今后的研究和发展方向。     

光化学烟雾的危害不容忽视

<正>光化学烟雾是指各种生产设备,特别是汽车排出废气中的碳氢化合物和氮氧化合物等一次污染物,在干热、阳光照射的特定条件下,会发生一系列复杂的光化学反应,而生成新的二次污染物。它刺激眼睛和咽喉,严重时破坏人体     

创新产品

正[编者按]红外高速球是带有红外线照明器的高速球型摄像机,是中国人原创的一种监控产品。随着红外LED照明在传统监控摄像头的流行,早在2007年,国内的安防从业人员重新设计高速球外壳外观,在传统的高速球型摄像机产品上也装上LED红外照明器,逐渐发展成为现在便用广泛的红外高速球。红外高速球较之传统的高速球更好地解决了夜视问题,红外高速球能在完全无光的情况下,通过高速球上的红外灯发出的肉眼不可见的红外光成像,实现往毫无灯光的情况下也能监控。根据选用的不同的红外灯类型,能达到从30米到200米的红外实际照射距离。本期《创新产品》栏目精选了一批最新面世的红外高速球机,介绍了这些产品的主要功能、应用领域、创新点及性能参数,希望对对红外高速球感兴趣的读者能有所帮助。     

Porous FeOx/BiVO4-δS0.08：Highly efficient photocatalysts for the degradation of Methylene Blue under visible-light illumination

Porous S-doped bismuth vanadate with an olive-like morphology and its supported iron oxide （y wt.% FeOx/BiVO4-δS0.08, y = 0.06, 0.76, and 1.40） photocatalysts were fabricated using the dodecylamine-assisted alcohol-hydrothermal and incipient wetness impregnation methods, respectively. It is shown that the y wt.% FeOx/BiVO4-δS0.08 photocatalysts contained a monoclinic scheetlite BiVO4 phase with a porous olive-like morphology, a surface area of 8.8-9.2 m^2/g, and a bandgap energy of 2.38-2.42 eV. There was co-presence of surface Bi^5＋, Bi^3＋, V^5＋, V^3＋, Fe^3＋, and Fe^2＋ species in y wt.% FeOx/BiVO4-δS0.08. The 1.40 wt.% FeOx/BiVO4-δS0.08 sample performed the best for Methylene Blue degradation under visible-light illumination. The photocatalytic mechanism was also discussed. We believe that the sulfur and FeOx co-doping, higher oxygen adspecies concentration, and lower baudgap energy were responsible for the excellent visible-light-driven catalytic activity of 1.40 wt.% FeOx/BiVO4-δS0.08.