警惕“光污染”

光污染已经成为继水污染、大气污染、噪声污染、固体废物污染之后的第五大污染,是21世纪直接影响人类健康的又一环境杀手!不少科学家认为,长期疲劳、偏头疼、视觉障碍、偶发性情绪波动、内分泌失调等疾病都与光污染有直接关系。光污染直接威胁环境及人类的健康:视力下降,干扰大脑中枢神经,人工白昼破坏人体正常生物钟,人工白昼伤害鸟类和昆虫,影响动植物的正常生长繁殖。然而,人们对"光污染"这个隐形的健康"杀手"的认识还比较肤浅,防范措施还非常有限,对人类的健康产生了隐性危害,应该引     

微波法制取锯末活性炭及其吸附Cr~(6 )性能的研究

介绍了微波照射—氯化锌法(ZCMR)制取锯末活性炭的方法。用该法所制锯末活性炭处理含铬废水的结果表明,该锯末活性炭具有吸附容量大、过滤速度快、操作控制方便等优点,活性炭对铬的吸附容量是市售一级粉末活性炭的1.72倍,极限吸附量达21.5mg/g,过滤速度为市售活性炭的1.64倍。     

秋意渐浓防秋愁

自古有“伤春悲秋”的说法。让人产生悲伤情绪的是一种激素,叫“褪黑激素”,它不但让人抑郁,还能让人入睡,是由我们大脑底部一个叫松果体的腺体产生的。充足的阳光可以抑制褪黑激素的分泌。但入秋后,阳关照射时间明显减少,特别秋天多雨,人体的褪黑激素就会增多,同时甲状腺素、肾上腺素的分泌会受到抑制,细胞也就会“懈工偷懒”,人的情绪...     

Efficient visible light photo-Fenton-like degradation of organic pollutants using in situ surface-modified BiFeO3 as a catalyst

The visible light photo-Fenton-like catalytic performance of BiFeO₃ nanoparticles was investigated using Methyl Violet (MV), Rhodamine B (RhB) and phenol as probes. Under optimum conditions, the pseudo first-order rate constant (k) was determined to be 2.21×10^-2, 5.56×10^-2 and 2.01×10^-2 min^-1 for the degradation of MV (30 μmol/L), RhB (10 μmol/L) and phenol (3 mmol/L), respectively, in the BiFeO₃-H₂O₂-visible light (Vis) system. The introduction of visible light irradiation increased the k values of MV, RhB and phenol degradation 3.47, 1.95 and 2.07 times in comparison with those in dark. Generally, the k values in the BiFeO₃-H₂O₂-Vis system were accelerated by increasing BiFeO₃ load and H₂O₂ concentration, but decreased with increasing initial pollutant concentration. To further enhance the degradation of pollutants at high concentrations, BiFeO₃ was modified with the addition of surface modifiers. The addition of ethylenediamineteraacetic acid (EDTA, 0.4 mmol/L) increased the k value of MV degradation (60 μmol/L) from 1.01×10^-2 min^-1 in the BiFeO₃-H₂O₂-Vis system to 1.30 min^-1 in the EDTA-BiFeO₃-H₂O₂-Vis system by a factor of 128. This suggests that in situ surface modification can enable BiFeO₃ nano-particles to be a promising visible light photo-Fenton-like catalyst for the degradation of organic pollutants.     

成都地区移动通信基站电磁辐射影响与水平

通过对成都地区典型移动通信基站的电磁环境监测,分析了移动通信基站的电磁环境规律及程度,明确其产生电磁环境影响在10-2W/m2等级,满足国标公众照射限值0.4W/m2的要求,并提出移动通信基站选址需要考虑的问题。     

“大哥大”照射剂量超过国家防护标准15倍专家建议给手机“穿”防护衣

据《服务导报》报告，中国邮电大学电磁兼容研究所所长高攸纲教授等四位专家于近日建议，移动通讯要给“大哥大”、“对讲机”装上防护罩。高攸纲教授介绍说，据中国电磁辐射测试中心和哈尔滨医科大学连续两年的测试表明，目前国内使用的“大哥大”、“对讲机”发射功率均在400     

辐射型集装箱检查系统环境影响研究

文章以秭归某TC-SCAN集装箱检查系统为研究对象,通过现场调研和监测,根据《集装箱检查系统放射卫生防护标准》(GBZ143-2002)和《电离辐射防护与辐射源安全基本标准》(GB18871-2002)的有关规定,对该项目投产运行后的辐射环境进行监测评价,得出研究结论,并对该类核技术应用项目的辐射环境管理工作提出建议。     

Photoelectrochemical degradation of Methylene Blue with -PbO2 electrodes driven by visible light irradiation

-PbO2 electrodes were prepared by electro-deposition and characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and linear sweep voltammetry. We confirmed pure -PbO2 crystals were on the electrode and it had a high oxygen evolution potential. The photoactivity and photoelectrochemical (PEC) properties of the -PbO2 electrode were investigated under visible light irradiation ( > 420 nm) for the decolorization of Methylene Blue. Pseudo first-order kinetics parameter (Kapp) for dye decolorization using the -PbO2 electrode achieved 6.71×10?4 min?1 under visible light irradiation, which indicated its excellent visible light-induced photoactivity. The Kapp of the PEC process was as much as 1.41×10?3 min?1 and was 1.71 times that of visible light irradiation or electrolysis even in the presence of the -PbO2 electrode. A significant synergetic effect was observed in the PEC system. We also employed TiO2 modified -PbO2 electrodes in this test, which revealed that the TiO2 immobilized on the -PbO2 electrode inhibited the visible light-induced PEC efficiency despite the amount of TiO2 used for electrode preparation. The -PbO2 electrode was also superior to the dimensionally stable anode (Ti/Ru0:3Ti0:7O2) in visible light-induced photoactivity and PEC efficiency.