MnO2@矿渣去除废水中的铊

以工业磁性矿渣构建具有二氧化锰包覆层（MnO2@矿渣）的吸附剂,用于去除废水中的重金属铊元素。并探究吸附剂投加量、反应时间、反应pH、离子强度、有机物等影响因素及除铊机理。结果表明：在碱性条件下（pH=10）,MnO2@矿渣对水中的铊的吸附率达99.5%以上,10 min 内达到吸附平衡; MnO2@矿渣对铊的吸附容量随投加量的增大而增大,随离子强度的增大而减小,有机物对吸附铊的影响表现出差异性。吸附过程符合拟二级动力学模型,等温吸附适用Langmuuir和Freundlich方程描述;通过X-射线粉末衍射（XRD）、扫描电子显微镜（SEM）-X射线能谱（EDS）表征手段分析,证实成功制备了MnO2@矿渣;傅里叶变换红外（FT-IR）和X射线光电子能谱（XPS）的结果表明MnO2@矿渣对Tl（I）的去除是一个表面羟基络合、氧化和沉淀的过程。重复利用实验表明MnO2@矿渣有很好的脱附与再生能力。     

“罐采样-实验室分析”测定环境空气中117种挥发性有机物要点分析

“罐采样-实验室分析”是当前测定环境空气中挥发性有机物的主流方法。结合已有资料,针对方法涉及的采样、样品运输与保存、分析测试等环节,考察了环境空气中挥发性有机物监测的主要影响因素。罐选择、清洁度、气密性、惰性化是样品保存的先决条件;采样流量控制器的气密性、流量校准等是保证监测准确的基本要素;温度变化对样品保存产生影响;标准气体的湿度、配置平衡时间、保存时间、配制准确性和内标气体的保存时间等会导致校准和溯源产生偏差。样品中的水分及二氧化碳是分析过程中影响监测结果准确性的干扰因素,实验室有机溶剂也会干扰分析的准确性。     

Meteorological mechanism for a large-scale persistent severe ozone pollution event over eastern China in 2017

An intensive and persistent regional ozone pollution event occurred over eastern China from 25 June to 5 July 2017.73 out of 96 selected cities,most located in the Beijing-TianjinHebei and the surrounding area(BTHS),suffered severe ozone pollution.A north-south contrast ozone distribution,with higher ozone(199±33 μg/m³) in the BTHS and lower ozone(118±25 μg/m³) in the Yangtze River Delta(YRD),was found to be dominated by the position of the West Pacific Subtropical High(WPS...     

Characterization of precipitation in the background of atmospheric pollutants reduction in Guilin: Temporal variation and source apportionment

Rainfall samples were collected from three observation sites in Guilin from 2013 to 2017, and the chemical composition characteristics of precipitation and the contribution made by different ion sources were analyzed when atmospheric pollutants levels were reduced. The results showed that acid gas emissions and atmospheric pollutant concentrations continued to decline during the study period. However, the change in the volume-weighted mean p H at the three sites suggested that acid rain pollutio...     

复杂电磁环境仿真软件中的电磁态势显示计算技术研究

在复杂电磁环境仿真软件中,电磁态势显示是一个重要的功能,而传统的单PC机仿真软件很难满足电磁态势显示大数据量和高计算精度的要求。从分布式计算以及接收区域模型化两个方面对传统的射线追踪算法加以改进,使其更加适合电磁态势仿真场景,以达到提升仿真效率的目的。     

射线追踪中与地形的加速技术研究

在采用射线追踪方法的仿真软件中,一般都会判断射线与地形的交点,从而判断射线与哪块地形发生相交和反射、绕射。目前地形多采用三角面的形式来模拟。而一条射线对较大地形所有三角面进行一次相交的判定的过程较长。就射线与地形判断相交和确定交点的位置的过程中估计射线路径从而减少与三角面的相交判断从而进行加速,从而使得射线追踪时间能够大幅度的缩短,提高了软件仿真的效率。     

Collaborative influence of morphology tuning and RE (La,Y, and Sm) doping on photocatalytic performance of nanoceria

Environmental Science and Pollution Research - Tuning morphology and doping additional rare earth (RE) cations are potential techniques to promote the photocatalytic performance of ceria (CeO2),...     

Global burden analysis and AutoGluon prediction of accidental carbon monoxide poisoning by Global Burden of Disease Study 2019

Environmental Science and Pollution Research - Accidental carbon monoxide poisoning (ACOP) is the most common occupational toxic disease, but related data are scarce or non-existent in many...     

Associations between exposure to different heavy metals and self-reported erectile dysfunction: a population-based study using data from the 2001-2004 National Health and Nutrition Examination Survey

Environmental Science and Pollution Research - Heavy metals are ubiquitous and nonbiodegradable pollutants that are widely distributed in the environment. Heavy metal exposure can damage various...     

Application of a combined response surface methodology (RSM)-artificial neural network (ANN) for multiple target optimization and prediction in a magnetic coagulation process for secondary effluent from municipal wastewater treatment plants

Environmental Science and Pollution Research - In this study, an enhanced coagulation-flocculant process incorporating magnetic powder was used to further treat the secondary effluent of domestic...