正交法设计Fe、N共掺杂TiO2/Ti液膜可见光光催化处理染料废水

采用溶胶-凝胶法制备了Fe、N共掺杂TiO_2膜电极(Fe,N-TiO_2/Ti),并设计三因素五水平正交试验对电极制备条件进行优化.结果表明,各因素影响主次顺序为:煅烧温度Fe掺杂量N掺杂量;最优制备条件为:煅烧温度550℃,Fe掺杂量0.3%(质量分数),N掺杂量0.3%(质量分数);共掺杂电极光催化活性优于单掺杂和未掺杂电极.紫外-可见漫反射和光电性能测试表明,催化剂有可见光响应;XRD表征结果表明,Fe、N共掺杂细化了晶粒,有效抑制了金红石相的形成,其晶型为锐钛矿型,粒径为11.48 nm.利用Fe,N-TiO_2/Ti与Cu阴极组装成斜置双极液膜反应器,可见光激发光催化降解苋菜红,考察了主要影响因素.结果发现,最佳条件为:初始pH 2.50,废水流量5.1 L·h~(-1),在此条件下处理20mg·L~(-1)苋菜红80 min,脱色率达到91.6%.电极重复使用10次,每次60 min,脱色率下降了12.99%,说明电极稳定性较好.     

转盘液膜光电催化法处理罗丹明B的反应动力学

采用幂指数方程法建立了转盘液膜光电催化法降解罗丹明B(RhB)废水的动力学方程.结果表明,该反应动力学符合表观一级动力学.在考察的影响因素中,外加偏压对反应速率的影响最大,催化剂用量次之,其次是RhB初始浓度,转盘转速和光强度的影响相对较小.     

Heavy metal poisoning resistance of a Co-modified 3Mn10Fe/Ni low-temperature SCR deNOx catalyst

Environmental Science and Pollution Research - Heavy metals have a great influence on the deNOx efficiency of catalysts. The 3Mn10Fe/Ni catalyst that used nickel foam (Ni) as the carrier, Mn and Fe...     

浅谈安全管理与提高员工执行力

企业执行力，是企业将战略及目标一步步落到实处的能力，任何一个企业的成功都离不开好的执行力。企业的发展执行力是基础，企业的安全管理也是如此。笔者结合工作实际，探讨提高执行力的做法。     

双转盘反应器光催化处理罗丹明B

采用溶胶—凝胶法制备的TiO2/Ti电极为光阳极,Cu、Fe、Zn或C为阴极,组成双转盘反应器,以罗丹明B(RhB)为目标污染物,考察了反应条件对光催化效率的影响.结果表明,最佳反应条件:阴极材料为Cu;转盘转速为70 r/min;初始pH为2.5;Na2SO4质量浓度为1.0 g/L; RhB初始质量浓度为20 mg/L.在最佳反应条件下,处理RhB模拟废水30 min的脱色率可达到99.9％.双转盘反应器处理不同浓度的RhB时,其脱色率是单转盘的1.12～2.33倍,且倍数随着RhB浓度增大而增加,表明双转盘反应器可高效地光催化处理高浓度染料废水.     

Photocatalytic degradation of bisphenol A using an integrated system of a new gas-liquid-solid circulating fluidized bed reactor and micrometer Gd-doped TiO2 particles

A new gas-liquid-solid circulating fluidized bed photocatalytic reactor (GLSCFBPR) with internally placed multi-layered UV lamps was developed. Micrometer Gd-TiO₂ particles and commercial nanometer P25-TiO₂ were chosen as the photocatalysts, and the hazardous substance bisphenol A (BPA) was chosen as the model pollutant to investigate the performance of this new photocatalytic system. The results showed that the photocatalytic degradation efficiency of the micrometer Gd-TiO₂ particles was similar to that of the nanometer P-25 particles at their respective optimum dosage but the former could be easily separated out by gravity. After investigating the effects of process parameters on the photocatalytic BPA degradation, the response surface method (RSM) was further used for process optimization. The interactions among process parameters, i.e., TiO₂ concentration, superficial gas velocity and superficial liquid velocity were discovered and a related analysis was carried out to explore the underlying mechanism. A quadratic mathematic model was established and performed satisfactorily when used for prediction. The optimum conditions for this new process were as follows: TiO₂ concentration 4.5 g/L, superficial gas velocity 7.83 × 10^-3 m/sec and superficial liquid velocity 8.65 × 10^-3 m/sec.     

TiO2半导体光催化反应器的研究进展

光催化氧化作为一种高级氧化技术,在环境污染控制方面得到了较快的发展.主要介绍了国内外近年来有关光催化反应中其反应器的设计与研究进展情况,按催化剂在反应器中的存在状态分类论述了各种反应器的结构原理和主要特点,以及反应器在设计中存在的问题和今后发展的方向.     

土壤中结合态农药环境毒理研究进展

本文介绍了近年来国内外对土壤中结合态农药的研究动向,叙述了土壤中农药的结合残留量、环境意义及结合残留的分析测试技术,尤其对超临界流体萃取结合残留的技术作了介绍,并对该领域的深入研究提出了还需要解决的问题     

Natural manganese ore catalyst for low-temperature selective catalytic reduction of NO with NH3 in coke-oven flue gas

Environmental Science and Pollution Research - Different types of manganese ore raw materials were prepared for use as catalysts, and the effects of different manganese ore raw materials and...