Separation of Eu(Ⅲ) with supported dispersion liquid membrane system containing D2EHPA as carrier and HNO_3 solution as stripping solution

The Eu(III) separation in supported dispersion liquid membrane (SDLM),with polyvinylidene fluoride membrane (PVDF) as the support and dispersion solution containing HNO3 solution as the stripping solution and Di(2-ethylhexyl) phosphoric acid (D2EHPA) dis-solved in kerosene as the membrane solution,was studied.The effects of pH value,initial concentration of Eu(III) and different ionic strengths in the feed phase,volume ratio of membrane solution and stripping solution,concentration of HNO3 solution,concentr...     

Fe-TiO_2对活性艳红K-2BP的光催化降解研究

采用溶胶-凝胶-浸渍法对二氧化钛进行掺铁改性,并以活性艳红K-2BP为降解模型反应物,研究了Fe-TiO2的光催化活性。结果表明:掺铁能够提高二氧化钛的光催化活性,当掺铁质量百分比为0.1%,煅烧温度为500℃,催化活性最好,当催化剂的投加量为3 g/L,通气量为600 mL/min,pH值为3时,对活性艳红K-2BP溶液紫外光照30 min的降解率可达到98.4%。     

电子注分析系统

本文简要地说明了电子注分析系统在超高频真空器件设计、研究中的作用及其重要性,并且着重介绍了该系统的构成及其技术、指标等。     

RuO2/La2O3/TiO2复合光催化剂对直接红棕M的降解研究

采用溶胶—凝胶—浸渍法制备RuO2/La2O3/TiO2纳米粉体.以汞灯为光源,直接红棕M溶液的光催化降解为模型反应.结果表明:掺杂质量百分比为1.39%的La2O3,0.12%的RuO2,煅烧温度500℃时,RuO2/La2O3/TiO2的催化活性最高;当通气量为100mL/min,催化剂投加量为3.00g/L,初始pH值为8.98时,该催化剂对直接红棕M的降解率可达100%.     

反萃更新中空纤维液膜对四价铈的回收提取研究

研究了Ce4+在以2-(二乙基己基)磷酸(P204)为流动载体,煤油和P204的混合溶液作为膜溶液,膜溶液和解析剂H2SO4溶液组成更新相的反萃更新中空纤维液膜(SRHFLM)中的提取行为;考察了料液酸度、更新相H2SO4浓度、膜溶液与H2SO4溶液体积比、不同载体浓度对Ce4+提取的影响,得出了以下Ce4+最优提取条件:更新相H2SO4溶液浓度2.50mol/L,膜溶液与H2SO4溶液体积比2:1,载体浓度控制在0.200mol/L,料液相酸度为0.05mol/L。在最优分离条件下,当Ce4+的初始浓度为1.00?10-4mol/L时,Ce4+在45min时提取率达到92.2%。最后提出了Ce4+在SRHFLM中的学渗透系数动力学模型。     

阶梯湿地基质不同粒径对净化农业生活废水的影响

湿地各参数对农业生活废水净化效果都有明显影响。研究采用阶梯湿地技术对农业生活废水进行净化,将四种不同粒径土壤（粒径A<10μm、10μm<粒径B≤100μm、100μm<粒径C≤2 000μm和粒径D>2 000μm）作为基质设置于湿地系统,研究在它们各自情况下湿地系统净化农业生活废水中主要污染物的能力。实验结果表明:系统中废水停留时间（HRT）为7天时,对废水中TN、NH₃-N、TP、浊度和COD的净化率为:粒径A为基质时,净化率分别为68.3%、79.4%、69.7%、73.9%和82.2%;粒径B为基质时,净化率分别为71.3%、86.5%、73.8%、84.2%和87.9%;粒径C为基质时,净化率分别为62.4%、71.6%、59.3%、84.5%和87.9%;粒径D为基质时,净化率分别为57.3%、68.3%、55.3%、72.1%和63.9%。其中粒径B净化效果最好,出水水质基本达到农田灌溉水质标准,净化后出水可以直接用于大田灌溉。     

EAC-UF系统制备优质饮用水的试验研究

采用压缩活性炭-超滤(EAC-UF)组合工艺处理微污染水制备优质饮用水,考察该工艺去除CODMn、Cl-、浊度和Fe3+的效果.结果表明,EAC-UF不仅能有效地去除有机物、浊度,对铁和Cl-也有较好的去除效果,且出水中悬浮物SS、细菌和大肠菌群数未检测出.该工艺运行稳定,出水水质满足GB 5749-2001要求.     

P507溶于煤油作为载体的一种新型分散组合液膜对Eu3+的分离

The separation of Eu3+ is studied with a dispersion combined liquid membrane (DCLM), in which polyvinylidene fluoride membrane (PVDF) is used as the liquid membrane support, dispersion solution containing HCl solution as the stripping solution, and 2-ethyl hexyl phosphonic acid-mono-2-ethyl hexyl ester (P507) dissolved in kerosene as the membrane solution. The effects of pH value, initial concentration of Eu3+ and different ionic strength in the feed phase, volume ratio of membrane solution to stripping solution, concentration of HCl solution, concentration of carrier, different stripping agents in the dispersion phase on the separation are investigated. The optimum condition for separation of Eu3+ is that concentration of HCl solution is 4.0 mol&#8226;L&#61485;1, concentration of carrier is 0.16 mol&#8226;L&#61485;1, and volume ratio of membrane solution to stripping solution is 30︰30 in the dispersion phase, and pH value is 4.2 in the feed phase. The ionic strength has no significant effect on separation of Eu3+. Under the optimum condition, when the initial concentration of Eu3+ is 0.8×10&#61485;4 mol&#8226;L&#61485;1, the separation percentage of Eu3+ is 95.3% during the separation time of 130 min. The kinetic equation is developed in terms of the law of mass diffusion and the theory of interface chemistry. The diffusion coefficient of Eu3+ in the membrane and the thickness of diffusion layer between feed phase and membrane phase are obtained and their values are 1.48×10&#61485;7 m2&#8226;s&#61485;1 and 36.6 μm, respectively. The results obtained are in good agreement with literature data.     

一体化膜生物反应器处理农村生活污水试验研究

采用一体化膜生物反应器(IMBR)工艺处理农村生活污水,考察了该工艺对COD、BOD5、NH3-N和浊度的去除效果。结果表明,在水温>22℃、ρ(DO)>3.4 mg.L-1、pH在6～9的条件下,工艺对COD、BOD5、NH3-N和浊度的去除效果较好,平均去除率分别达到93.1%、95.3%、93.8%和97.9%,出水COD、BOD5、NH3-N的质量浓度、浊度分别为19～31 mg.L-1、5.1～7.8 mg.L-1、1.9～3.1 mg.L-1、0～1 NTU,水质优于GB 5084-2005要求。     

TiAl金属间化合物反常应变速率效应的研究

采用系列温度及不同应变速率条件下的压缩试验研究TiAl,TiAl-V的塑性形变行为结果表明,在不同温度区间,Peierls—Nabarro机制,交滑移机制和蠕变为塑性形变的主要控制机制,TiAl-V合金在600—700K形变时出现反常应变速率效应,而且塑性应变量越大.反常效应越明显,利用位错交滑移的热激活特性理论对此反常效应进行初步解释,温度和应变速率对加工硬化指数的影响及不同塑性应变量对应变速率敏感性的影响在本文中也进行了探讨。