盐酸溶液改性蛭石对气态单质汞的吸附性能

采用盐酸溶液对蛭石进行浸渍处理,考察了盐酸溶液改性蛭石对气态单质汞的吸附能力。研究结果表明：盐酸溶液改性蛭石对气态单质汞的吸附效果好于未改性蛭石,盐酸浓度为4．0mol／L时,盐酸溶液改性蛭石对气态单质汞的吸附效果较佳;进气中气态单质汞的质量浓度越高,盐酸溶液改性蛭石对气态单质汞的去除率越低;适当提高吸附温度对盐酸溶液改性蛭石吸附气态单质汞较有利;降低蛭石粒径,盐酸溶液改性蛭石对气态单质汞的去除率提高。     

Science and the Consequences of Mistruct: Lessons from Recent GM Controversies

In 2001, it was announced thattransgenic DNA had introgressed intotraditional strains of maize in Mexico. Acontroversy erupted and raged throughout 2001and 2002. This episode represents an acutebreakdown in scientific discourse. Given thestakes in the genetically modified organismdebate, a breakdown in scientific discourse isalarming. The following inquiry looks into thecauses of this breakdown. Ultimately, it willbe argued that the underlying problem is thecurrent institutional structure of science,particularly in the United States. If thediagnosis is correct, then the proper course oftreatment is to pursue a program ofinstitutional reconstruction.     

用改性活性碳纤维去除CO2原料气中的H2S

采用固定床动态吸附实验，用改性活性碳纤维（ACF）吸附去除CO2原料气中的H2S。通过改变改性剂种类、反应温度和原料气中CO2浓度，找出用改性ACF去除CO2原料气中H2S的规律。实验结果表明：常温下，可用NaON改性的ACF来消除CO2的酸性对去除H2S的不利影响；随着反应温度的升高，CO2与ACF形成的C（O＊）中间产物增多，CO2的存在有利于改性ACF去除H2S；而当反应温度过高时，CO2与ACF形成的C（O＊）中间产物发生分解，导致ACF碳化，不利于H2S的吸附去除。     

改性木屑吸附剂对印染废水的脱色性能研究

本文介绍了以廉价易得的杨树木屑为原料，经环氧氯丙烷交联，制备的一种新的生物吸附剂，研究各种反应因素（氢氧化钠浓度、环氧氯丙烷用量、反应温度、木屑粒径等）对反应过程和吸附剂性能的影响，检验了其对品红及孔雀石绿在不同条件下的吸附性能，并探讨了它的吸附动力学曲线和再生性能。     

改性活性炭纤维吸附炸药废水中TNT实验研究

本文研究了改性活性炭纤维对炸药废水中TNT的吸附行为。研究表明:1 mol/L HNO3改性的活性炭纤维吸附效果最好,其对炸药废水中TNT的最佳吸附条件为:吸附剂用量为0.6 g/25 m L,吸附平衡时间为60 min,升温有利于吸附进行。Langmuir和Freundlich吸附等温线均能较好地描述活性炭纤维对TNT的吸附,吸附动力学分析表明,吸附过程遵循准二级动力学规律。     

微波诱导热解法制备落叶吸附剂及其工艺优化

采用微波诱导热解法制备低成本落叶吸附剂,以实现落叶的资源化利用.以碘吸附值为响应值,采用响应面分析法研究了微波诱导热解法制备落叶吸附剂的工艺条件.结果表明,热解时间与微波功率之间存在交互作用,当热解功率增加时,可适当缩短热解时间.落叶吸附剂的最佳制备工艺条件为:热解时间4.04 min,微波功率488.72W,氯化锌质量分数27％.落叶吸附剂以微孔吸附为主,BJH孔径分布较窄,孔容最高峰对应的孔径在1.9 nm左右,Langmuir比表面积为769.61 m2/g.     

石墨烯材料去除重金属及放射性核素的研究

石墨烯及其改性材料具有比表面积大、吸附能力强、抗辐射性能好、耐高温、耐酸碱等优点,近年来在去除重金属和放射性核素领域得到了广泛关注.本文简要介绍了石墨烯的合成及改性方法,综述了石墨烯材料去除水中重金属离子和放射性核素的研究进展,包括吸附容量、影响因素、吸附动力学、吸附热力学模型和吸附机理,分析了该研究领域目前存在的问题,探讨了今后的研究方向.     

Enhanced CO2 adsorptive performance of PEI/SBA-15 adsorbent using phosphate ester based surfactants as additives

In this study,a series of polyetherimide/SBA-15: 2-D hexagonal P6 mm,Santa Barbara USA(PEI/SBA-15) adsorbents modified by phosphoric ester based surfactants(including tri(2-ethylhexyl)phosphate(TEP),bis(2-ethylhexyl) phosphate(BEP) and trimethyl phosphonoacetate(TMPA))were prepared for CO_2 adsorption.Experimental results indicated that the addition of TEP and BEP had positive effects on CO_2 adsorption capacity over PEI/SBA-15.In particular,the CO_2 adsorption amount could be improved by around 20% for 45PEI–5TEP/SBA-15 compared to the additive-free adsorbent.This could be attributed to the decrease of CO_2 diffusion resistance in the PEI bulk network due to the interactions between TEP and loaded PEI molecules,which was further confirmed by adsorption kinetics results.In addition,it was also found that the cyclic performance of the TEP-modified adsorbent was better than the surfactant-free one.This could be due to two main reasons,based on the results of in situ DRIFT and TG-DSC tests.First and more importantly,adsorbed CO_2 species could be desorbed more rapidly over TEP-modified adsorbent during the thermal desorption process.Furthermore,the enhanced thermal stability after TEP addition ensured lower degradation of amine groups during adsorption/desorption cycles.     

Novel eco-friendly spherical porous adsorbent fabricated from Pickering middle internal phase emulsions for removal of Pb(II) and Cd (II)

Spherical porous materials prepared from the emulsion template used in the water treat-ment have displayed a vast prospect,as the high surface area,abundant porous structure,convenient operation and excellent adsorption performance.But the tedious fabrication process,high consumption of organic solvent and surfactant limited the application widely.Herein,a facile and eco-friendly spherical porous adsorbent (SPA) is fabricated from the green surfactant-free (corn oil)-in-water Pickering medium internal phase emulsions (Pick-ering MIPEs) via the convenient ion crosslinking procedure.The Pickering MIPEs synergis-tically stabilized with the semi-coke (SC),which is the natural particle produced from the shale oil distillation,and sodium alginate (SA) has excellent storage and anti-coalescence stability.The as-prepared porous adsorbent possessed the abundant pore structure,which provided favorable conditions for effective mass transfer in adsorption,and could be tuned by varying the SA dosage.The saturation adsorption capacities of Pb(Ⅱ) and Cd(Ⅱ) can be achieved with 460.54 and 278.77 mg/g within 45 min at 25℃,respectively.Overall,this study supplied a viable and eco-friendly route for fabricating the spherical porous adsorbent with a tunable porous structure for heavy metal ion wastewater.     

3-氨丙基三乙氧基硅烷改性蒙脱石的表征及其对Sr(Ⅱ)的吸附研究

3-氨丙基三乙氧基硅烷(APTES)作为偶联剂在粘土功能化方面具有特殊的研究意义.因此,本文采用X射线衍射(XRD)、扫描电镜(SEM)及红外光谱(FTIR)等方法对不同离子交换容量(1.0CEC、1.5CEC、2.0CEC、2.5CEC、3.0CEC、4.0CEC)的APTES改性蒙脱石(APTES-Mt)的结构及表面进行表征与分析,同时对Sr(Ⅱ)的吸附性能进行了研究.结果表明,改性蒙脱石对Sr(Ⅱ)的吸附平衡时间为24h,吸附量随溶液pH(1.0～10.0)的增大而增强,且改性蒙脱石的吸附量是原始蒙脱石吸附量的3倍.改性蒙脱石对Sr(Ⅱ)的吸附作用较强,吸附后的Sr(Ⅱ)不易从材料中解吸出来.XRD、SEM和FTIR等分析结果显示,APTES已经成功插入层间,改性蒙脱石对Sr(Ⅱ)的吸附机理主要为配位吸附.