Heavy Metal Removal from Water by Adsorption Using Pillared Montmorillonite   总被引：1，自引：0，他引：1  

LIU Yun WU Pingxiao DANG Zhi YE Daiqi 《《地质学报》英文版》2006,80(2):219-225

Removal of Cu^2＋, Cr^3＋ and Cd^2＋ from aqueous solutions by adsorption on montmorillonite modified by sodium dodecylsulfate （SDS） and hydroxy-alumino-silicate （HAS） was investigated. Experiments were carried out as a function of solution pH, solute concentration, and time. The Langmuir model was adopted to describe the single-solute adsorption isotherm, in which the Langmuir parameters were directly taken from those obtained in single-solute systems. The kinetics of metal ions adsorption was examined and the pseudo-first-order rate constant was finally evaluated.  相似文献   

Adsorption Kinetics of Methylene Blue from Aqueous Solutions onto Palygorskite   总被引：2，自引：0，他引：2  

PENG Shuchuan WANG Shisheng CHEN Tlanhu JIANG Shaotong HUANG Chuanhui 《《地质学报》英文版》2006,80(2):236-242

The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 mg/L, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 kJ/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of methylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and liquid-film diffusion.  相似文献   

黄河、长江和钱塘江水样不同级分滤液与铅吸附络合反应动力学的初步研究   总被引：1，自引：0，他引：1  

赵卫红  张正斌  王江涛 《中国海洋大学学报(自然科学版)》1999,(Z1)

采用过滤和切向超滤将黄河、长江和钱塘江水样分成＜ １ ．０μｍ ,＜ ０ ．４μｍ ,＜ ５０００Ｄａｌｔｏｎ （ 相当于１ ．５ｍｍ 孔径） 三个级分,分别对三个级分滤液与铅进行吸附络合反应的动力学进行了初步研究。黄河水样＜ １．５ｎｍ 超滤液与铅吸附络合反应呈快反应,＜ ０．４μｍ 和＜ １ ．０μｍ 的各级过滤液呈慢反应;长江和钱塘江水样各级滤液均呈慢反应。长江和钱塘江水样与铅反应存在络合竞争,反应速率取决于竞争离子络合物的解离速率;黄河水样则没有络合竞争。黄河水样＜ ０ ．４μｍ 和＜ １ ．０μｍ 的滤液与铅的络合反应速率由铅与胶体之间的反应决定,反应速率由液膜扩散控制。  相似文献   

Determination of adsorbed and absorbed polychlorinated biphenyls (PCBs) in seawater microorganisms     

Petra Wallberg  Agneta Andersson   《Marine Chemistry》1999,64(4):51

To distinguish between adsorbed and absorbed PCBs in seawater microorganisms, 2,2′,4,4′,5,5′-hexachlorobiphenyl (IUPAC #153; HCB) was added to a pure culture of Chrysochromulina apheles Moestrup et H.A. Thomsen. After the addition of the HCB, the cells were immediately harvested onto 2 μm polycarbonate filters and rinsed with a gradient of ethanol concentrations. Rinsing with 40% ethanol (v/v) was found to remove 80% of the HCB, which was loosely adsorbed to the cell surfaces, but did not extract the interior of the cells, as tested by chlorophyll a analysis. This method was used in a time course experiment which estimated PCBs adsorption and absorption to different groups of plankton organisms. Three different ¹⁴C-PCBs, 4-chlorobiphenyl (IUPAC #3; MCB), 2,2′,5,5′-tetrachlorobiphenyl (IUPAC #52; TCB), and 2,2′,4,4′,5,5′-hexachlorobiphenyl (IUPAC #153, HCB), were incubated in seawater from the northern Baltic Sea during a spring bloom. Samples were taken every third day and separated by filtration into three fractions; 0.2–2 μm (bacteria), 2–10 μm (flagellates), and >10 μm (microplankton; phytoplankton and protozoa). Two subsamples were retained from each size fraction. One of the subsamples was left untreated, to obtain adsorbed plus absorbed PCB, while the other subsample was rinsed with 40% of ethanol, to obtain the absorbed PCB. The sorption was found to vary depending on the hydrophobicity of the compounds, the structure of the cell membranes, and the lipid content and composition of the cells. The absorption increased for the TCB and the HCB in the largest size fraction over time, which coincided with an increase of the neutral and non-polar lipids.  相似文献   

极性矿物对纳米金的吸附实验   总被引：2，自引：1，他引：1  

姜泽春  莫德明  陈大梅 《矿物学报》1999,19(3):358-361

纳米金通常带有负电荷,遇带正电荷的矿物,它将被吸附而沉淀。黄铁矿、黄铜矿、闪锌矿和α－石英是金矿中常见矿物,是载金矿物,也是极性矿物（半导体矿物,热电矿物）。实验结果表明,在动态温度条件下矿物表面有正负电荷,因此同种矿物能够相互吸附,纳米金被带正电荷的矿物吸附。  相似文献   

海泡石中水的红外光谱及其结构稳定性的指示作用   总被引：5，自引：2，他引：3  

宋功保  张建供  郭颖  万朴  彭同江  董发勤 《岩石矿物学杂志》1999,18(1):80-86

在仔细分析海泡石中水的约外谱图特点的基础上,本文其结构水（ＯＨ）结晶水（ＯＨ２）沸石水（Ｈ２Ｏ）吸收带进行了逐个归属,并对比分析了热液型和沉积型海泡石谱图的差异,通过分析处理海泡石样品红外谱图,发现热处理过程中谱图的变化特征与热相变过程能很好地吻合,论证了海泡石中水的红外光谱具有指示结构稳定性的作用。  相似文献   

煤层气藏三维数值模拟   总被引：5，自引：0，他引：5  

冯文光  梅世昕 《矿物岩石》1999,19(1):43-48

本文根据煤的储气特征,煤层气的吸附特征,排水降压解吸产机理建立了煤层气藏数学模型和三维全隐式差分模型,采用最佳变松驰求解,收敛度快,稳定性好。  相似文献   

四种处理方法下盐碱池塘底泥N,P的吸附与释放     

申屠青春  董双林 《海洋湖沼通报》1998,(4):54-61

本文科用五个ClNaⅡ水型低洼盐碱地池塘的底泥和水样,测定了底泥、间隙水和池水中的N、P营养盐含量,并设定NaHCO34mmol／L加搅拌、CaCl22mmol／L加搅拌、NaHCO34mmol／L+CaCl22mmol／L加搅拌、搅拌等四种处理方法及对照,研究了四种处理方法对于促进盐碱池塘底泥营养盐的释放的作用。实验结果表明：四种处理方法都明显地促使底泥释放NH4－N、PO4－P,同时使水体中的NO3－N、NO2－N浓度减少,但都未达到显著程度（P＞0．05）,这说明加入的试剂并未显著增加盐碱池塘底泥营养盐的释放。在本实验的处理方法下,底泥对NH4－N、PO4－P的吸附与释放与底泥中NH4－N、PO4－P的含量有密切关系。  相似文献   

二元气体等温吸附实验及其对煤层甲烷开发的意义   总被引：11，自引：0，他引：11  

唐书恒  汤达祯杨起 《地球科学》2004,29(2):219-223

分别进行了CH₄-CO₂和CH₄-N₂二元混合气体的等温吸附实验, 并且分析了二元气体在吸附过程中各组分浓度的变化规律.结果表明, 在CH₄-N₂二元气体的吸附过程中, 吸附相中CH₄组分的相对浓度逐渐增加, N₂组分的相对浓度逐渐减少.在CO₂-CH₄二元气体的吸附过程中, 吸附相中CO₂组分的相对浓度逐渐增加, CH₄组分的相对浓度逐渐减少.实验结果证实了CO₂在与CH₄的竞争吸附中占据优势, 而N₂在与CH₄的竞争吸附中处于劣势.注入CO₂比注入N₂可以更有效地置换或驱替煤层甲烷, 提高煤层甲烷的采收率.   相似文献   

我国煤储层煤层气解吸特征   总被引：12，自引：2，他引：10  

李小彦  司胜利 《煤田地质与勘探》2004,32(3):27-29

通过大量煤层气勘探井试验测试,对我国各时代不同煤级煤在储层温度和常压条件下气体解吸试验结果进行了系统研究,分析了解吸过程中气体析出的变化规律及煤层气解吸参数的变化态势,探讨了我国煤层气解吸特征的变化,为煤层气采收率研究提供理论依据。   相似文献