可见光下氮掺杂二氧化钛对巯基苯并噻唑的降解

光降解反应中为了有效地利用可见光,以氨水为氮源,采用溶胶凝胶法在温和条件下制备出黄色氮掺杂二氧化钛。分别采用XRD、TEM、XPS和UV-Vis漫反射光谱对样品进行了表征。结果表明,所制备的样品均为锐钛矿相,晶粒随N/Ti配比的增加而增大;氮掺杂进入二氧化钛晶格中使可见光吸收增强。为控制水处理过程中的气味问题,以巯基苯并噻唑为探针,考察了氮掺杂二氧化钛的可见光活性。结果显示氮掺杂二氧化钛在可见光照射下可使巯基苯并噻唑的降解率为商用二氧化钛DegussaP-25的3倍。此外,存在一个最佳N/Ti配比显示出最高的可见光活性。     

轻型厂房的几种基础型式经济性比较

针对上部结构荷载不大，场地内回填土较厚且回填时间较长的某一轻型厂房，笔者选择人工挖孔桩，冲击式夯扩桩和换土垫层三种不同的基础施工方案进行比较，在保证强度、刚度、稳定性和严格控制基础沉降的前提下，从不同的角度作出工程技术经济分析，对类似工程具有一定的参考作用．     

造纸黑液的超声/絮凝联合处理研究

以苇浆黑液为处理样品 ,利用超声与PFS/H2 O2 的协同预处理研究 ,结果表明 :它们的联合处理比单独用PFS/H2 O2 处理 ,CODcr的去除率提高 1 1 .39%～ 1 3 .31 % ;与同等条件处理结果相比 ,利用超声可节约PFS1 4 % ,H2 O2 50 %～ 80 % ;同时也表明 ,处理效果与探头的辐射面积关系不大 ,即使增加电功率 ,效果也不明显 ,由此可推断这与黑液成份复杂有关。     

Ti(IV)与铜离子共掺杂的羟基磷灰石薄膜弱紫外光杀菌研究

采用共沉淀水热合成和离子交换的方法,制备了钛与铜离子共掺杂的羟基磷灰石(Ca10(PO4)6(OH)2:HAP)(HAPTiCu),以大肠杆菌为目标物,研究了不同材料负载的多孔镍网薄膜在弱紫外光下的杀菌活性.结果表明,HAPTiCu在弱紫外光下具有高效杀菌效率,并远远高于HAPTi和P25 TiO2薄膜.这主要是铜离子的抗菌与光催化分解细菌的协同作用的结果.电子自旋共振(ESR)研究表明杀菌反应的主要活性物种是O2-.HAPTiCu薄膜释放的铜离子在光催化杀菌反应过程中,被光催化还原沉积在表面,导致了较低的铜离子溶出,从而保证了材料的稳定性.     

Combined effect of US/PFS on the black liquor of making paper

The reed pulping black liquor is used as a sample. Researches of (1) combined effect of ultrasound(US)/polyferric sulphate(PFS)/hydrogen peroxide(H2O2); (2) effects of the horn tip areas; (3) effect of dose of PFS were carried. Extrapolation of these experiments indicated treatment results are possibly related to complex chemical compositions in the reed pulping black liquor.     

Preparation and characterization of visible-light-active nitrogen-doped TiO2 photocatalyst

A visible-light photocatalyst was prepared by calcination of the hydrolysis product of Ti(SO4)2 with ammonia as precipitator. The color of this photocatalyst was vivid yellow. It could absorb light under 550 nm wavelength. The crystal structure of anatase was characterized by XRD. The structure analysis result of X-ray fluorescence(XRF) shows that doped-nitrogen was presented in the sample. The photocatalytic activities were evaluated using methyl orange and phenol as model pollutants. The photocatalytic activities of samples were increasing gradually with calcination temperature from 400℃ to 700℃ under UV irradiation. It can be seen that the degradation of methyl orange follows zero-order kinetics. However, the calcination temperatures have no significant influence on the degradation of phenol under sunlight. The N-doped catalyst shows higher activity than the bare one under solar irradiation.     

超声去除垃圾渗滤液中的氨氮

采用超声辐照技术去除垃圾渗滤液中的氨氮.研究结果表明,超声辐照对垃圾渗滤液中的氨氮有很好的去除效果.渗滤液中氨氮超声去除的机理主要是氨氮以游离氨的形式在空化泡内发生高温热解反应,生成氮气和氢气而排出.     

等离子体发生区工作时发射特定光谱的研究

介绍了2种不同等离子体发生区和不同测量距离对等离子体发生区沿面蓝光中紫外光的波长和相对光强的影响,所测的臭氧发生量大的等离子体发生区的紫外光的相对光强高,测量距离与相对光强呈指数关系,并且等离子体发生区沿面蓝光具有光催化作用.     

Comparative study of the oxidation of atrazine and acetone by H2O2/UV, Fe(III)/UV, Fe(iii)/H2O2/UV and Fe(II) or Fe(III)/H2O2

In this study, the rates of degradation of organic compounds by several AOPs (H₂O₂/UV, Fe(III)/UV, Fe(III)/H₂O₂/UV, Fe(II)/H₂O₂ and Fe(III)/H₂O₂) have been compared. Experiments were carried out at pH ≈ 3 (perchloric acid / sodium perchlorate solutions) and with UV reactors equipped with a low-pressure mercury vapour lamp (emission at 253.7 run). The data obtained with atrazine ([Atrazine]_o = 100 μg/L) showed that the rate of degradation of atrazine in very dilute aqueous solution is much more rapid with Fe(III)/UV than with H₂O₂/UV. Photo-Fenton process (Fe(III)/H₂O₂/UV) was found to be more efficient than H₂O₂/UV and Fe(II)/H₂O₂ for the mineralization of acetone ([Acetone]_o = 1 mM).     

报废轻武器毁形方法研究

目的 研究探索报废轻武器毁形方法。方法 根据报废轻武器的毁形难点,分析切割、粉碎、锻压、熔炼等各种现有毁形方法的技术优势、难点及可行性,并对部分毁形技术进行验证试验,确定可以应用于轻武器毁形的技术方法。结果 经过试验检验,机械切割无法切断14.5 mm枪管,激光切割、等离子切割无法直接切透14.5 mm枪管,粉碎机无法对14.5 mm枪管进行完全破碎,加热和锻压技术可以对枪支实现彻底毁形,加热粉碎技术对14.5 mm枪管破碎效果一般,残疾规格随意性大。结论 组合运用加热和锻压技术进行轻武器毁形具有时间短、效率高、操作简单的优势,而且便于实现销毁自动化。