阳离子改型蛭石的铵离子交换平衡特性

对经Na^＋，Ca^2＋、Mg^2＋等不同离子处理的改型蛭石在不同pH和温度条件下进行了铵离子交换性能的研究。结果表明，交换反应均在前60min速率最快，约120min就趋向于平衡：铵离子交换总量均随pH变化而波动，在pH=7点上取最大值，且全交换容量按镁型蛭石、钙型蛭石，钠型蛭石顺序依次增大，每100g蛭石分别为59.32，71.89、92.85mmol；改型蛭石对NH^＋4等温交换吸附与Langmuir方程相符。表明改型蛭石对NH^＋4的吸附主要是单分子层的化学吸附。     

离子色谱法替代铬酸钡光度法测定硫酸根可行性探讨

探讨了以清洁水质和标准样品为实验对象，分别采用离子色谱法和铬酸钡光度法进行对比实验，根据实验结果证明了用离子色谱法替代铬酸钡光度法测定硫酸根离子可行性。     

徐州市三环西路硝基苯泄漏事故应急监测案例分析及研究

2006年4月徐州市三环西路发生一起硝基苯泄漏事故。通过对该环境应急监测案例的分析与研究,认识到我们在突发性污染事故环境监测与管理方面的不足,提出了加强与改进的措施,使环境应急监测系统更完善。     

A review of removal technology for antimony in aqueous solution

Antimony (Sb) and its compounds, toxic metalloid, have been classified as high-priority pollutants. Increasing Sb released into the water environment by natural processes and anthropogenic activities, which exposure threatens to human health and ecosystems. Therefore, it is of unquestionable importance to remove Sb from polluted water. Keeping in view the extreme importance of this issue, we summarize the source, chemistry, speciation, distribution, toxicity, and polluted situation of Sb about aqueous solution. Then, we provide the recent and common technology to remove Sb, which are based on adsorption, coagulation/flocculation, electrochemical technology, membrane technology, ion exchange, etc. In this review, we focus in detail on the adsorption method, researchers at present have been investigating to discover more advanced, cost-effective, eco-friendly, reusable adsorbents. However, to date the Sb-containing wastewater treatment technologies are not sufficiently developed and most of research have been tested only in controlled lab conditions. Few reports are available that include field studies and applications. We critically analyzed the salient features and removal mechanisms, evaluating benefits and limitations of these technologies, hoping to provide more references for further research. Finally, we considered the Fe- or Mn-based technologies was the most promising technique to remove Sb for field application.     

Controlled synthesis of Zeolite adsorbent from low-grade diatomite: A case study of self-assembled sodalite microspheres

Highly efficient and sustainable conversion technologies to generate uniform sodalite(Na_8(AlSiO_4)_6(OH)_2) zeolite micro spheres with low-grade waste natural diatomite as raw materials via a solution-mediated crystallization route were developed in the present study.The synthesis process can be considered as an in-situ zeolitization of diatomite precursor without involving any me so scale template and any post-synthetic modification.The mass ratios of diatomite and AlCl_3·6 H_2 O have remarkable effect on the morphology,crystal structure and porosity of sodalite zeolite product.The preferred sodalite microspheres with uniform mesoporous of size 3.5-5.5 nm and large surface area of 162.5 m2/g exhibit well removal performance for heavy metal ions(Pb(II),Cd(II),Zn(II),and Cu(II)),with the highest adsorption abilities for Pb(II) ions of 365 mg/g.In addition,the effect of contact time,initial ion concentration,competitive adsorption and solution pH were evaluated.The removal performance results from synergistic effects of dominating cation-exchange and additional surface chemisorption.The study may broadly help unveil chemical control reactions of the zeolitization processes of diatomite,and thus facilitates the development of promising zeolite materials for the use in natural and engineered aquatic environments by recvcling waste diatomite resources.     

离子选择电极测定烟气中氟化物影响因素的探讨

对离子选择电极测定烟气中氟化物的影响因素进行了探讨,提出了解决办法。     

丹东市区酸雨状况综述

通过对丹东市区降水时间及空间变化趋势的分析,总结酸雨污染现状,找出丹东市区酸雨变化特征。     

吸附Cu~(2+)接枝纤维的制备与表征

以漂白蔗渣浆纤维素为基体,二乙烯三胺为单体,硝酸铈铵为引发剂,制备胺基接枝纤维,制备高效重金属吸附剂。研究了单体用量、引发剂用量、温度、时间等反应因素对胺基接枝纤维制备的影响。采用红外光谱、X射线衍射和扫描电镜分析表征胺基接枝纤维的结构。结果表明:绝干蔗渣纤维:单体二乙烯三胺=1:1(质量比),硝酸铈铵的用量为25%,温度为70℃,时间为2 h时可以获得较高的吸附量,其吸附量可以达到12.8 mg/g。通过红外光谱和扫描电镜分析手段,对接枝纤维的结构进行表征。     

离子色谱法测定工业废水中丙酸

建立了用离子色谱法测定工业废水中丙酸的方法,结果表明,常规阴离子对本方法的测定没有干扰,校准曲线线性相关系数高,并且能在很大范围内呈现线性。运用该方法实测标样和水样,精密度和准确度都能满足需求,表明该方法测定结果可靠,具有一定的应用价值。对实际废水样品进行分析,丙酸的回收率分别为95．0％～103．8％。本方法分析速度快,所需样品量少,且无需要复杂的前处理,简便、灵敏、可靠。     

离子色谱法同时测定工业废气中丁酸和异丁酸

建立了用离子色谱法测定有组疲废气和无组织废气中丁酸和异丁酸的新方法。对实际废气样品进行分析,丁酸和异丁酸的回收率分别为93．0％～103．3％和94．0％～104％。本方法分析速度快,所需样品量少,且无需要复杂的前处理,简便、灵敏、可靠。