A comprehensive assessment of supported titania photocatalysts in a fluidized bed photoreactor: Photocatalytic activity and adherence stability

Titania (TiO₂) was immobilized onto hydroxylated glass beads (HGB) via the thermal bonding and sol–gel coating methods. The photocatalytic activity and adherence stability of the prepared supported photocatalysts were studied in a fluidized bed photoreactor. P25 thermally bonded HGB was found to be more active than sol–gel coated HGB prepared with the same immobilization conditions, while both of them exhibited poor adherence stability, i.e., large amounts of immobilized TiO₂ detached from HGB during the degradation. The adherence stability was improved with limited extents by increasing the calcination temperature or reducing the coverage of TiO₂ on HGB, but either of these approaches resulted in lower activity. The poor adherence stability was ascribed to the fluid shear force and particle friction in fluidized bed, as well as the insufficient bonding between TiO₂ and HGB in terms of the bonding mechanism.

Hydroxylated quartz sands (HQS) and silica gel beads (SGB) were further studied and used as supports. Results have shown that the adherence stability was significantly improved with SGB but only slightly improved with HQS. Characterizations results showed that a coarser surface and more surface Si–OH groups could improve the adherence stability of supported TiO₂ photocatalysts.     

深圳市大康河综合整治工程生态化治理研究

以大康河综合整治工程为背景对河道生态化整治进行研究,对工程涉及的防洪、水质、景观等基本现状进行评价,提出了生态治理的指导思想,并具体介绍了防洪、水质、景观等综合治理措施,通过对大康河的综合整治,使得工程既能满足防洪要求又能实现良好的生态景观效果。     

表面活性剂对HCl-FeCl3溶液中锌精矿在浆萃取浸出率的影响

The effects of surfactant on the solvent extraction in leaching sphalerite were investigated. It is found that sodium dodecyl sulfonate is the effective surfactant in improving the zinc recovery from sphalerite in the aqueous FeCl3-HCl-tetrachloroethylene system. Through the measurements of surface tension and viscosity of the sphalerite slurry modified with different surfactants, it is concluded that sodium dodecyl sulfonate in the concentration range of 0.05 to 0.2g L-1 can improve the viscosity of sphalerite slurry in the water, decrease the surface tension of leaching solution, prevent the aggregation of ore particles, and give very high zinc extraction .     

钯负载锰氧化物基双金属复合氧化物催化氧化羰基化合成碳酸二苯酯

采用共沉淀法分别制备锰掺杂钨、钒、铋3种双金属复合氧化物载体,以氯化钯为活性组分制备负载型催化剂,并用于苯酚氧化羰基化合成碳酸二苯酯（DPC）。通过气相色谱（GC）、X射线衍射（XRD）、氢气程序升温还原（H₂-TPR）、X射线光电子能谱（XPS）等表征手段,对催化剂结构和性能进行表征。结果表明:钨-锰载体随掺杂比例和焙烧温度升高,逐步形成四氧化三锰晶粒,同时钨渗入锰氧化物晶格中,在掺杂比（物质的量比）为1:1、焙烧温度为600 ℃条件下制备的催化剂性能最佳,DPC收率为5.20%;钒-锰载体在焙烧温度为400 ℃、掺杂比为1:5条件下形成二氧化锰晶相,催化剂性能明显提高,DPC收率为10.46%,而较高的焙烧温度会破坏晶型的完整;铋-锰载体在掺杂比为1:5、焙烧温度为400 ℃条件下制备的催化剂催化效果最好,DPC单程收率可达到13.13%。     

SMC彩色屋面玻璃钢瓦的研制

通过对SMC彩色屋面玻璃钢瓦与粘土瓦、彩钢瓦、石棉瓦等屋面瓦性能特点与力学性能的对比，可知玻璃钢瓦简述了TSMC屋面瓦材料及其工艺研发，并对SMC屋面瓦应用前景进行简要描述。     

新型绝缘树脂及应用

本文介绍了FUCHEM系列无溶剂绝缘树脂的性能及应用，着重探讨了产品的阻燃、低收缩、高耐腐蚀、高耐热等级等特性。     

新型绝缘树脂的应用

本文介绍了FUCHEM系列无溶剂绝缘树脂的性能及应用，着重探讨了产品的阻燃，低收缩，高耐腐蚀，高耐热等级等特性。     

刍议酒-湖特高压跨线施工期间水布垭电厂保供电措施

根据酒湖线特高压跨线施工对水布垭电厂运行造成的影响和要求,结合恩施地区及周边的电网结构、特点,电厂从组织管理、技术等多方面采取了种种措施,保证了厂网的安稳运行,并对进一步提升电厂的保供电能力提出了建议。     

降压新药西尼地平杂质Ⅰ的制备

以西尼地平为起始原料,活化MnO2为氧化剂,一步法制备了2,6-二甲基-4-(3-硝基苯基)吡啶-3,5-二甲酸3-(2-甲氧基)乙酯5-(3-苯基)-2(E)-丙烯酯(记为西尼地平杂质Ⅰ).经实验优化,制备西尼地平杂质Ⅰ的最适宜条件为:m(西尼地平):m(MnO2)=1.00:1.24,甲苯为溶剂,105℃下反应1 h.反应得到西尼地平杂质Ⅰ收率为92.3％,经高效液相色谱面积归一化法检测后,纯度达到99.2％.产物结构经HRMS,1HNMR、13CNMR以及FTIR进行确认.该反应实现了西尼地平绿色高效直接转化西尼地平杂质Ⅰ.