非晶态TiO2-W薄膜的光催化性能研究

采用磁控溅射技术在玻璃基片上制备了W掺杂的非晶态TiO2薄膜,用XRD、XPS和椭圆偏光测厚仪等对薄膜进行了微观分析.结果表明,TiO2-W薄膜为非晶态结构.Ti以 4价存在;W以0价和 6价形式存在,并且6价和0价W的原子浓度比为6.4:1;薄膜中Ti和W的原子浓度比为2.6:1.对5 mg·L-1的亚甲基蓝溶液光催化脱色试验表明,随着膜厚的增加,光催化降解率递增,当膜厚达到141 nm时,所制备的TiO2-W薄膜对亚甲基蓝的脱色率在2 h达到90%;当膜厚大于141 nm时,光催化降解率不再增加.     

自适应神经模糊推理在大气环境质量评价中的应用

利用matlab模糊工具箱中自适应神经模糊推理系统（Anfis）方法，对大气环境质量评价作一个尝试性的工作。利用Antis法对大气环境质量现状的评价，并与灰色聚类法作比较，得出Antis法用于评价环境质量是可行的，且具有许多优点。     

纳污河口水体中溶解有机物对Cr(Ⅵ)的还原作用--实验室模拟

工厂排放的含Cr(Ⅵ)废水注入河口之后,受水体中溶解有机物的还原,转化为低毒的Cr(Ⅲ).在天然水体中Cr(Ⅵ)被溶解有机物还原的反应动力学表明:该过程对Cr(Ⅵ)和H~ 均为一级反应.还原过程由两个反应组成,反应Ⅰ是Cr(Ⅵ)对酚羟基(φ—OH)的氧化,反应速度常数k_1~(18℃)=0.036min~(-1).反应Ⅱ是Cr(Ⅵ)对醇羟基(R—OH)的氧化,反应速度常数k_1~(＇18℃=1.5×10~(-3)min~(-1)。反应的活化能E_1=26kcal/mol,E_1~＇=40kcal/mol(18—28℃).利用正交设计实验测定该还原反应热力学的有关参数得出:溶解有机物对Cr(Ⅵ)的还原作用体系的反应物浓度和pH对反应平衡点有显著影响河口水域的水化学条件有利于Cr(Ⅵ)的还原.在反应平衡时六价铬的浓度(C_(Cr)~(eq)_(VI))与溶解有机物含量(DOC)之间的相关关系的基础上,外推得出不同环境功能水质要求的排放标准的计算通式:C_(Cr)~d_(VI)=α(Q/q)C_(Cr)~8_(VI) kDOC     

丁草胺在水体中的光解和稻田中归趋的研究

丁草胺在太阳光下，纯水中稳定，田水中消解较快。在模拟太阳的紫外光下，水体的ｐＨ值和溶解氧对其光解无影响；丙酮可加速其光解；Ｈ２Ｏ２可诱发化学氧化和水解，同时加速光解反应。主要光解产物被分离、鉴定。丁草胺在水中不易挥发，能够被土壤吸附。在田间丁草胺在水中消解较快，半衰期〈１ｄ，８－１６ｄ检不出；在土壤中，半衰期为３．３ｄ，３０ｄ后检不出。     

空气污染对城市太阳辐射影响的试验研究

对太阳辐射强度和空气污染浓度的观测分析表明:晴日太阳辐射的减弱与空气污染浓度密切相关。因此可以用太阳辐射强度的长期变化间接推断当地大气质量的长期变化。     

A wireless, remote query magnetoelastic CO2 sensor

This paper presents a wireless, passive, remote query CO2 sensor comprising a ribbon-like magnetoelastic thick-film coated with a mass-changing CO2 responsive polymer synthesized from acrylamide and isooctylacrylate. In response to a magnetic field impulse, the magnetostrictive magnetoelastic sensor vibrates at a characteristic resonant frequency that is inversely dependent upon the mass of the attached CO2 responsive polymer. The mechanical vibrations of the magnetostrictive sensor launch magnetic flux, which can be detected remotely using a pickup coil. By monitoring the resonant frequency of the passive sensor, the atmospheric CO2 concentration can be determined without the need for physical connections to the sensor or specific alignment requirements. The effect of humidity and the CO2 responsive copolymer composition on the measurement sensitivity are reported. Greatest sensitivity is achieved with a polymer comprising a 1:1 mole ratio of acrylamide to isooctyl acrylate. A 0.7% change in atmospheric CO2 concentration can be detected for a 20 microns thick polymer coated sensor.     

Refining mercury emission estimations to the atmosphere from iron and steel production

正Due to its long-range transport in the atmosphere,mercury is a pollutant of global concern with health risks to humans and ecosystems worldwide(Li et al.,2012;Lindqvist et al.,1991;Liu et al.,2012a;Tang et al.,2016;Wang et al.,2015;Shao et al.,2016).Atmospheric mercury,mainly from emission from various natural and anthropogenic sources and     

磁性多壁碳纳米管对BPA的吸附特性

针对普通碳材料吸附BPA需要过滤或离心等复杂过程,将Fe3O4晶体沉积到多壁碳纳米管(MWCNTs)表面,合成饱和磁化度为23.3 emu/g的磁性多壁碳纳米管(MMWCNTs)以实现简便的固液分离.MMWCNTs对水相BPA的吸附是一个快速过程,饱和吸附量为14.9 mg/g.MMWCNTs对水相BPA的吸附过程△G为负值,是一个自发过程;△H为负值,是一个放热过程;△S为正值,是一个熵增过程.MMWCNTs对BPA的吸附具有物理吸附特征,MMWCNTs与BPA之间的相互作用力主要为范德华力.     

Characterization of ISO 14001 implementation

Environmental degradation caused by human activities is of concern to society, government, industry, companies, and the people who are able to enjoy improved lifestyles because of industrial activities. However, all of these parties also have a responsibility to support and conserve the environment and act responsibly toward the earth. This article, which includes a systematic literature review and draws upon the authors’ practical experience, summarizes the benefits, motives, and difficulties in implementing environmental management systems using the International Organization for Standardization's (ISO) 14001 framework.     

Decomposition and decoupling analysis of carbon emissions from agricultural economic growth in China's Yangtze River economic belt

Environmental Geochemistry and Health - In this study, carbon emissions from agricultural energy consumption (CEAEC) are fully analyzed using data from the Yangtze River Economic Belt (YEB) between...