STUDY ON THE ADSORPTION BEHAVIOR OF Pb（Ⅱ） ON NANOMETER ATTAPULGITE BY FAAS

The adsorptive behavior of nanometer attapulgite modified by acid to Pb（Ⅱ） was investigated by flame atomic absorption spectrometry （FAAS） in this paper. The mainly effect parameters ott the adsorptive efficiency of Pb（Ⅱ）, such as the acidity of the solution, the amount of attapulgite, oscillation time and static time were studied. Also the influencing factors of the recovery efficiency of Pb（Ⅱ）, including the concentration of hydrochloric acid, the volume of hydrochloric acid, oscillation time and static time were investigated. The adsorptive capacity of Pb（Ⅱ） on nanometer attapulgite was 26.5mg/g and the adsorptive capacity of first cycle and second cycle regenerated nanometer attapulgite were 26.5mg/g and 26.3mg/g, respectively. The results obtained indicated that the regenerated effect was good.     

PREPARATION OF SURFACE ION-IMPRINTED ATTAPULGITE-SUPPORTED POLYMER AND ITS ADSORPTION BEHAVIORS OF Sr（II）

The surface ion-imprinting concept and chitosan incorporated sol-gel process were applied to the preparation of a new attapulgite-supported organic-inorganic hybrid polymer for selective separation of Sr（II） from aqueous solution. The prepared polymer was characterized with SEM, IR and XRD. The results showed that as a sorbent, it had good configuration and binding sites. Its adsorption behaviors for Sr（II） was investigated by FAAS and ICP-AES. The effects on adsorption capacities, including pH, quiescent time, and adsorbent amount were discussed, and the adsorption isothermal curve was obtained. Then the Kd a parameter estimating relative adsorbability, was conducted to study the selectivity towards Sr（II） of the prepared polymer. Under the optimum conditions, the ion-imprinted polymer offered a fast kinetics for the adsorption of Sr（II） and the maximum capacity was 12.9mg/g. The Kd and K parameters estimating relative adsorbability towards target ion, suggested that selective recognition of the ion-imprinted polymer towards Sr（II） was much higher than that of the non-imprinted polymer and attapulgite. Furthermore, the ion-imprinted polymer is of great regeneration capacity. The prepared functional polymer was shown to be promising for selective preseparation and enrichment of trace Sr（II） in environmental samples.     

水热条件下坡缕石在NaOH溶液中的行为及结构变化

分别用1,2和3 mol·L^-1的NaOH溶液,在不同的温度条件下对坡缕石进行了侵蚀实验。对反应后的固相产物进行了XRD和SEM分析,对浸出液中的金属阳离子进行了原子吸收光谱分析。讨论了反应温度和碱溶液浓度对碱溶后产物的影响。XRD和SEM结果表明,c_NaOH≤2 mol·L^-1时,坡缕石经碱溶液侵蚀后,可以生成蒙脱石和方沸石,其中反应温度的升高有利于方沸石的形成,碱溶液浓度的升高有利于蒙脱石的形成。当碱溶液浓度达到3 mol·L^-1,反应温度为200 ℃时,最终产物为SiO₂。浸出液的定量分析结果显示,坡缕石与碱溶液的反应过程中,Na⁺对八面体阳离子的置换具有选择性,置换顺序为：Al³⁺＞Fe³⁺(Fe²⁺)＞Mg²⁺。     

Characteristics of Titanocene Catalyst Supported on Palygorskite for Ethylene Polymerization

Due to the technical problems observed for homogeneous metallocene catalysts, such as reactor fouling and requirement for large amount of expensive methylaluminoxane (MAO) as cocatalyst, the development of supported metallocene catalysts is very important…     

Suspension Polymerization of Methyl Methacrylate Stabilized Solely by Palygorskite Nano Fibers简

A kind of fibrous clay, palygorskite(PAL), was used as the sole stabilizer in suspension polymerization without the using of any other stabilizer usually used, especially polymeric stabilizers. In order to improve the compatibility with the organic monomer, PAL nano fibers were organically modified with silane coupling agent methacryloxypropyltrimethoxysilane(MPS). Transmission electron microscopy(TEM) and Fourier-transform infrared(FTIR) spectroscopy results show that the hydrolyzed MPS was attached onto PAL surface through Si―O―Si bonds formation without morphology change of PAL. At a loading amount of PAL to monomer as low as 0.36 wt%, effective stabilization could be achieved. After suspension polymerization, spherical poly(methyl methacrylate)(PMMA) particles were obtained. Scanning electron microscopy(SEM) analysis on both the outer surface and the inner cracked surface of the spherical PMMA particles indicates that the PAL particles reside on the surface of the PMMA spheres. The densely stacked PAL together with attached silane coupling agent stabilized the droplets throughout the suspension polymerization.     

坡缕石/聚丙烯酰胺无机-有机杂化絮凝剂的合成、表征与应用

将酸活化坡缕石(PGS)与氯化乙醇胺(EACl)所得氯化乙醇胺改性坡缕石(PGS-EACl)与高价铈盐(Ce⁴⁺)组成氧化还原非均相引发体系,引发丙烯酰胺单体聚合得到了坡缕石/聚丙烯酰胺(PGS/PAM)无机-有机杂化物.用¹HNMR、FTIR、粘度法和电导法对杂化物进行了结构表征,表明杂化物中存在PGS^Θ⊕NH₃R离子键合作用.考察了PGS-EACl用量、聚合反应时间和单体浓度对杂化物特性粘数的影响.由PGS/PAM杂化絮凝剂分别处理高岭土和氧化铁红两种配制废水,发现杂化絮凝剂的絮凝效果明显优于纯PAM絮凝剂.     

BiOCI-ovl坡缕石复合可见光催化剂的制备及其对醇类的选择性氧化研究

采用简单的一步水热法,制备了一系列BiOCl-ov/坡缕石（PGS）复合材料x B/P（x是复合材料中BiOCl-ov的摩尔含量）.通过扫描电子显微镜（SEM）、粉末X射线衍射（XRD）、X射线光电子能谱（XPS）、N₂吸附-脱附、红外光谱（FT-IR）、紫外-可见漫反射光谱（UV-Vis DRS）、荧光光谱（PL）和电化学阻抗谱（EIS）对复合光催化剂的结构、形貌和光学性质以及电化学性质做了详细的表征.研究了催化剂在可见光条件下对芳香醇的选择性氧化的催化性能,结果表明,以所得复合材料为催化剂,在可见光照射下,苯甲醇转化率达到了78%,产物苯甲醛的选择性达到了86%,且催化剂的光稳定性良好.     

坡缕石微粉润滑油添加剂对钢/钢摩擦副摩擦学性能的影响及其机理探讨

将微米级的坡缕石矿物粉加入基础油中,考察了钢/钢摩擦副在销盘试验机上相对于基础油的摩擦学性能,采用扫描电镜（SEM）、透射电镜（TEM）、俄歇电子能谱（AES）、激光拉曼共焦光谱（Ram an）等仪器分析了磨损试验后试样表面层成分与结构的变化,探讨了矿物微粉在摩擦磨损过程中的作用机理.结果表明,坡缕石的加入可明显提高摩擦副的减摩抗磨性能;使摩擦副表面更为平整;使表层氧化层厚度减少;增加了试样表层C元素的富集;试验过程中矿物粒子有破碎和解束现象,起到了隔离摩擦副的作用.这些因素都对改善摩擦副的摩擦学性能发挥了有利作用.