热辅助紫外光催化氧化方法用于总磷检测的实验研究和动力学分析(英文)

A novel thermal-assisted ultra-violet (UV) photocatalysis digestion method for the determination of total phos-phorus (TP) in water samples was introduced in this work. The photocatalytic experiments for TP digestion were conducted using a 365 nm wavelength UV light and TiO2 particles as the photocatalyst. Sodium tripolyphosphate and sodium glycerophosphate were used as the typical components of TP and the digested samples were then determined by spectrophotometry after phosphomolybdenum blue reaction. The effects of operational parameters such as reaction time and temperature were studied for the digestion of TP and the kinetic analysis of two typical components was performed in this paper. The pseudo-first-order rate constants k of two phosphorus compounds at different temperatures were obtained and the Arrhenius equation was employed to explain the effect of temperature on rate constant k. Compared with the conventional thermal digestion method for TP detection, it was found that the temperature was decreased from 120 °C to 60 °C with same conversion rate and time in this thermal-assisted UV digestion method, which enabled the digestion process work at normal pressure. Compared with the individual ultra-violet (UV) photocatalysis process, the digestion time was also decreased from several hours to half an hour using the thermal-assisted UV digestion method. This method wil not lead to secondary pol ution since no oxidant was needed in the thermal-assisted UV photocatalysis digestion process, which made it more compatible with electrochemical detection of TP.     

近距煤层合层综放工作面矿压显现规律研究

针对近距煤层合层综放开采覆岩移动破坏与矿压显现规律等问题,以涡北煤矿842首采综放工作面为工程背景,采用相似模拟试验和数值分析手段对工作面开采过程进行研究。结果表明：相似模拟试验下覆岩冒落带高度为38 m,开切眼附近裂隙带的高度为103.8 m,停采线附近裂隙带的高度为95.4 m,基本顶初次来压步距为28 m,周期来压步距为17.5 m。由数值分析得到采场围岩位移场与应力场的变化颇为相似,分析采场前方支承压力分布特征与相似模拟试验的结果相吻合。研究结果可为近距煤层合层综放工作面煤柱宽度、工作面支护参数设计提供技术指导。     

提升高寒、高海拔地区边坡绿化效果施工技术研究

两河口水电站位于高寒高海拔地区,在自然条件下,施工开采后的边坡不利于植物生长,绿化植物的种子成活率和绿化覆盖率低,绿化效果不理想。阐述了对提升高寒高海拔地区边坡绿化效果施工技术进行的研究,通过采取切实有效的措施,显著提高了边坡绿化植物的种子成活率和绿化覆盖率,所取得的经验可为类似工程绿化施工提供借鉴。