Highly efficient Zr doped-TiO2/glass fiber photocatalyst and its performance in formaldehyde removal under visible light

Zr-doped-TiO_2 loaded glass fiber(ZT/GF) composite photocatalysts with different Zr/Ti ratios were prepared with a sol–gel process. Zr4+can replace Ti4+in the TiO_2 lattice, which is conducive to forming the anatase phase and reducing the calcination temperature. The glass fiber carrier was responsible for better dispersion and loading of Zr-doped-TiO_2 particles, improving the applicability of the Zr-doped-TiO_2. The ZT/GF photocatalysts were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), ultraviolet–visible spectroscopy(UV–vis) and Barrett–Joyner–Halenda(BJH). The performance of photocatalysts with different loading was evaluated in formaldehyde degradation under visible light at room temperature. ZT/GF0.2exhibited the highest activity, with a formaldehyde removal rate as high as 95.14% being observed, which is better than that of the photocatalyst particles alone. The stability of the catalyst was also tested, and ZT/GF exhibited excellent catalytic performance with 94.38%removal efficiency, even after seven uses.     

石化企业环境管理体系能源管理探讨

分析了石化企业环境管理体系运行中的能源管理现状,结合环境管理体系与能源管理体系关系,依托能源管理体系的思路和方法,对环境管理体系中的能源管理进行了探讨.     

Atmospheric DDTs over the North Pacific Ocean and the adjacent Arctic region: Spatial distribution,congener patterns and source implication

During the 2003 Chinese Arctic Research Expedition (CHINARE 2003) from Bohai Sea to the high Arctic (37°N–80°N), air samples were collected and analyzed for DDTs. ∑DDTs (sum of six congeners) ranged from 0.52 to 265 pg m^?3 with an average of 13.1 pg m^?3. Higher DDT concentrations were observed in Bohai Sea and near eastern Russia. The congener patterns were obviously different between the Far East Asia and the higher latitudinal regions that p,p'-DDT and o,p'-DDT were dominated in the former; while o,p'-DDT and o,p'-DDE were dominated in the latter. The source contributions of technical DDT and dicofol type DDT were estimated. Results showed that technical DDT was the dominant source (>94%) which was fresher in the Far East Asia compared to the North Pacific Ocean and the Arctic. For dicofol type DDT, the estimated contribution was minor. The “new” o,p'-DDT observed should have relatively more contribution from dicofol type DDT in the North Pacific Ocean and the Arctic.     

铁水包底粘铁所引发的一起重伤事故分析

介绍了一起铁水包底粘铁所引发的事故经过,进行了事故原因分析,指出了事故教训和预防措施。     

生物絮凝法与化学絮凝法处理洗毛废水的比较

分别采用生物絮凝法和化学絮凝法处理300 mL COD为20 000 mg/L、SS为4 000 mg/L的洗毛废水,最佳生物絮凝条件:生物絮凝剂加入量为5 mL,反应温度为30℃,先以120 r/min搅拌5 min、再以60 r/min搅拌35 min,洗毛废水pH为9.0.COD去除率达92%.最佳化学絮凝条件:化学絮凝剂加入量为30 mL,反应温度为40℃,先以120 r/min搅拌5 min、再以60 r/min搅拌25 min,洗毛废水pH为5.0.COD去除率达93%.生物絮凝剂和化学絮凝剂对洗毛废水的絮凝效果接近,但生物絮凝剂的加入量比化学絮凝剂少很多.     

粉尘爆炸强度分级方法存在问题分析

介绍了目前国际上粉尘爆炸强度分级方法及分级判据，并对其存在的问题进行了分析，在此基础上提出新的等级划分及分级判据。     

利用磷霉素生产盐渣合成阻垢剂

将磷霉素生产盐渣经水解得到右旋磷霉素二钠,再通过亲核取代反应得到可用作循环冷却水阻垢剂的氨基二乙基(1-甲基-2-羟基)膦酸四钠(ADMHP·Na4),并用FTIR表征了产物结构.实验结果表明:在取代反应温度为25℃、取代反应时间为2h、n(氨水)∶n(右旋磷霉素二钠)=8的条件下,由右旋磷霉素二钠制备ADMHP·Na4,收率可达83.87％.处理1t盐渣可创造利润3 080元.当ADMHP·Na4质量浓度为30 mg/L,水样温度为60℃时,ADMHP·Na4对CaCO3的阻垢效果较好,阻垢率可达91.47％.     

TiO2-Bi2O3纳米粒子气相光催化降解对二甲苯

采用沉淀法制备了TiO2-Bi2O3纳米粒子,并对其进行结构表征.以制得的TiO2-Bi2O3为光催化剂,以对二甲苯为目标污染物,研究了对二甲苯气相光催化氧化降解的影响因素.实验结果表明:经750 ℃焙烧的光催化剂对对二甲苯的催化效果最好;随氧气加入量的增加,对二甲苯的降解率增大;少量水蒸气的加入,可增大对对二甲苯降解率;采用L-H动力学模型得到对二甲苯光催化降解的反应速率常数和吸附常数分别为0.089 5 μmol/(L· min)和0.000785 L/μmol.     

气升式环流生物反应器处理废水厌氧过程研究

采用气升式环流生物反应器处理模拟废水。周期性通入空气和氮气来实现厌氧一好氧交替过程。对厌氧一好氧过程和普通好氧过程进行了对比,研究了厌氧处理时间和曝气速率对生物除磷效果的影响。结果表明,厌氧过程可以显著地增强生物除磷效果,与普通好氧过程相比,在进水总磷质量浓度为10mg／L时,磷的去除率可以提高30％,而COD的去除基本不受影响;适当延长厌氧处理时间和适当增大厌氧过程曝气速率可以改善厌氧环境及活性污泥性能,提高磷的去除率。