Photocatalytic removal of NO and NO2 using titania nanotubes synthesized by hydrothermal method

In this study, the photocatalysts of titania nanotubes(TNTs) were synthesized at different calcination temperatures using commercial Degussa TiO2(P25) as a precursor. The materials were then characterized by BET, SEM, TEM, and XRD analyses. The photocatalytic reactions with NO and NO2 under UV-A irradiation were both performed. The results showed that the photocatalytic reaction rate of NO was much faster than that of NO2, and the conversion of NO2 to nitrate was the rate-limiting step for photocatalytic removal of NOx if the nitrate produced cannot be removed continuously from the photocatalyst surface. For TNTs calcined at different temperatures, a significant enhancement was observed on the total NOx removal efficiency by TNT calcined at 500°C for both NO and NO2 photocatalytic reaction, which could be attributed to its high anatase crystallinity as well as high surface area. These two factors affect primarily on the NO2conversion step in which the high anatase crystallinity could be responsible for the high efficiency at the beginning, while the high surface area could be accounted for retaining this high efficiency from nitric acid poisoning during the test period.     

Combination of heterogeneous Fenton-like reaction and photocatalysis using Co-TiO2 nanocatalyst for activation of KHSO5 with visible light irradiation at ambient conditions

A novel coupled system using Co–Ti O2 was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction（SR-Fenton） and visible light photocatalysis（Vis-Photo）, for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50 mg/L Rhodamine B（Rh B） degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the Ti O2 lattice is the reason for the visible light photocatalytic activity of Co–Ti O2. Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability,and almost no dissolution of Co2＋was found.     

气相中乙酸乙酯光解的光子效率:波长和催化剂的影响

采用4种不同波长的准分子光源(Xe Cl*、Kr Cl*、Xe Br*和Kr Br*)降解气相的乙酸乙酯.对比了外加3种负载型光催化剂(有机膜负载Ti O2、有机膜负载石墨烯和纱网负载Ti O2)条件下乙酸乙酯的去除率,考察了光源类型、辐射功率和气体初始浓度对去除率的影响.同时,测定了不同光源的辐射光谱和辐射功率,计算了不同反应条件下的光子效率.结果表明,乙酸乙酯去除率按Kr Br*Kr Cl*Xe Cl*Xe Br*依次降低,而Xe Cl*和Kr Br*光源降解乙酸乙酯气体可以得到较高的光子效率;有机膜负载Ti O2比不加催化剂时乙酸乙酯去除率和光子效率都有所提高,但提高幅度不大.气体流速和乙酸乙酯初始浓度升高,光子效率升高.采用Kr Br*准分子灯直接光解乙酸乙酯,实验条件为:辐射功率0.76 W,乙酸乙酯初始浓度946mg·m-3,气体流速600 m L·min-1,光子效率为5.63%.     

改性贵金属催化剂催化还原脱除NO

含有NO的工业废气直接排放会严重污染空气,须对含有NO的工业废气进行净化处理.采用NH3为还原剂贵金属铂催化剂进行了低温还原NO脱除烟气中氮氧化物性能的研究.结果表明:实验室制备的贵金属铂催化剂具有高的低温活性和选择性催化还原脱除NO的性能,但该催化剂易被原料气中少量的硫化物(SO₂)中毒而影响其稳定性;用稀土元素La和Ce对贵金属铂催化剂进行改性,改性后贵金属铂催化剂的稳定性得到了大幅度提高,出口气体中氮氧化物浓度大幅度降低.本实验Pt∶La∶Ce最佳摩尔比为1∶3.78∶3.56.     

浅论"三基"工作与安全管理

加强"三基"工作,是几代石油石化人经验和教训的结晶,多年以来我们一直沿用这个法宝,克服了无数困难,取得了很大成绩.现在我们重提"三基"工作,就是要用传统的优良作风来克服当前管理滑坡的行为,提高广大职工的技术业务素质,养成规范严谨的工作作风.只有这样,我们的安全工作才能长期稳定下去,才能保证长治久安.     

沼渣生物炭基Fenton催化剂的制备及其高效降解吡虫啉农药废水的研究

以废弃物沼渣和含铁剩余污泥为原料,采用一步热解法制备沼渣生物炭基Fenton催化剂(以下简称催化剂),构建了非均相Fenton反应体系处理含吡虫啉模拟废水,考察了H2 O2和催化剂用量对吡虫啉去除率的影响.结果表明,非均相Fenton反应体系中,H2 O2最佳投加量为0.50 g/L,催化剂最佳投加量为1.00 g/L...     

环保新产品DDS胶硫催化剂

江西永丰县博源实业有限公司研发成功DDS脱硫催化剂，较之现有的脱硫及其催化剂具有较高的载氧性和稳定性，是一种全新的湿法脱硫技术，是用DDS脱硫催化剂及相关辅料水溶液吸收气体中的有机硫、无几硫、氧化氮，溶液在DDS脱硫催化剂与酚类物质的协同催化下，空气氧化再生，副产硫磺，再生液全部循环使用，从而达到脱硫、脱氮的目的。     

聚丙烯腈基活性炭纤维对罗丹明B吸附性能研究

利用扫描电子显微镜（SEM）和比表面分析仪等对聚丙烯腈基活性炭纤维进行表征。考察了吸附动力学、pH值、吸附温度及罗丹明B初始浓度对吸附性能的影响。结果表明,最佳接触时间为140min;在中性条件下,罗丹明B的去除率最低,pH=2.0时达到最大;温度为55℃时,ACFs的吸附效果最好;罗丹明B的去除率随着罗丹明B初始浓度增大而减小。并对材料的吸附机制进行了简要的分析。     

小议光触媒在室内空气污染中的作用

随着社会经济的高速发展,人们的生活水平不断提高,在追求居住环境、办公环境的美观舒适的同时,各种各样的装修带来的一系列的室内空气污染问题.光触媒作为一种新兴的治理室内空气污染的催化剂逐渐被人们认可和接受.     

贺禹:“核电应优先规划、优先调度、优先发电”

正日前,由全国政协委员、中国广核集团有限公司董事长贺禹发起,中国核工业建设集团公司董事长王寿君、国家电力投资集团公司董事长王炳华、中国核动力研究设计院院长罗琦等全国政协委员联名提交了《确保核电按基荷运行,推动实现能源供给侧结构性改革》的提案,建议更好地发挥核电在推