改性膨润土在含Cr(Ⅵ)废水处理中的应用

利用改性膨润土对废水中的Cr(Ⅵ)进行吸附是目前废水处理中最有前途的方法之一.较全面地介绍了我国膨润土的改性方法、机理,综述了改性膨润土处理含Cr(Ⅵ)废水技术在我国的应用情况,指出改性膨润土在处理Cr(Ⅵ)废水的技术前景及其在其他类别电镀废水处理方面应用的可行性.     

膨润土改性及应用进展

对膨润土的结构性质、改性技术及改性后处理废水污染物的应用做了综述,对无机改性膨润土中高温培烧、酸改性、盐改性以及有机改性膨润土中各种改性剂的优点及局限性作了总结,着重阐述了近年来的研究热点,即有机改性剂与无机高分子改性剂复合使用的改性方法,目前将改性膨润土应用于实际废水处理仍然存在一些现实问题,但此改性方法工艺简便,改性后的膨润土可同时吸附含重金属离子、含染色剂、含芳香类化合物、含磷等废水中的污染物,且吸附效果显著。     

膨润土在废水处理中的应用研究进展

介绍了膨润土的结构、性能及改性膨润土在废水处理中的应用．尤其对改性膨润土在含重金属离子、有机污染物、有色污染物等方面的治理应用作了较为详细的介绍。同时指出改性膨润土在应用中存在的问题．展望了其应用前景。     

改性膨润土吸附重金属离子的研究与应用进展

膨润土具有很强的吸附能力,通过对膨润土进行改性,可提高其对重金属离子的去除能力.国内外学者对改性膨润土用于含重金属离子污水的处理进行了广泛的研究.概述了膨润土改性制备方法和表征手段,讨论了影响改性膨润土吸附重金属离子的主要因素.对近年来国内外改性膨润土吸附水体中铬、镉、汞、铅、镍等重金属离子的应用研究进行了综述,并指出了改性膨润土用于重金属废水处理存在的问题和今后的研究方向.     

改性膨润土在废水处理中的应用

概述了膨润土的主要特性，研究了膨润土的主要改性方法以及改性膨润土在废水处理中的应用，讨论了改性膨润士用于废水处理中存在的问题和今后的研究方向。     

膨润土在废水处理中的应用进展

介绍了膨润土及改性膨润土的基本组成和基本性质,阐述了膨润土的改性方法,论述了膨润土及改性膨润土在废水处理中的应用及展望.     

改性膨润土在废水处理中的应用

膨润土是一种由蒙脱石构成的粘土矿物，广泛地应用于工业、农业和其他领域。目前膨润土已开始应用于废水处理中，但是未经改性的膨润土对去除废水中有机物和脱色效果较差，故一般用于废水处理的膨润土都要经过改性，增大其比表面积，提高吸附能力。对国内外膨润土在废水处理领域的应用及研究现状、改性方法、活化方法等做了概述，并展望了其应用前景。     

改性膨润土在含磷废水处理中的应用

分别介绍了膨润土的无机改性、有机改性和交联改性的改性方法及机理,并综述了3类改性膨润土对含磷废水处理的应用情况.     

铝柱撑改性膨润土吸附剂处理含镍(Ⅱ)废水的研究

以辽宁凌源膨润土为研究对象,将其进行铝柱撑改性,并将改性膨润土吸附剂用于含镍(Ⅱ)废水处理。该实验主要探讨了铝柱撑改性土用量、柱化剂用量、柱化剂老化时间、处理时间、处理温度对Ni2+残留量的影响。结果表明:膨润土经铝柱撑改性后,最佳吸附量及柱化量均为6%;柱化剂老化时间48 h,效果最好;废水处理80 min,Ni2+的残余浓度最低;废水处理温度为60℃时,吸附的Ni2+达到最佳值。     

膨润土改性和复配及在废水处理中的应用进展

膨润土是一种以蒙脱石为主要成分的优质吸附剂,在废水处理过程中有原料易得、成本低、吸附效果好等诸多优势.天然膨润土直接作为吸附剂使用存在亲水性强、吸附后固液分离困难等缺点,为改善其性能,需采用各种方法对其进行改性、复配.综述了近年来膨润土改性及膨润土复合吸附剂合成的各种方法,总结了改性膨润土及膨润土复合吸附剂在废水处理中的研究进展,旨在为确定改性膨润土及膨润土复合吸附剂今后发展方向提供思路.     

膨润土改性及其应用研究

为了改善膨润土的性能,扩大其使用范围,综述了膨润土的结构和针对这种独特的片层结构进行的改性原理及方法,以及制备得到钠化改性膨润土、活化膨润土、有机改性膨润土和纳米复合膨润土等不同类型的改性膨润土,并分析了膨润土改性后在环境保护、载体等领域的应用与前景。改性膨润土大大提高了膨润土的性能与品质,改变了中国膨润土资源品质低、应用受到限制的局面,有助于充分利用好中国丰富的膨润土资源,提高其附加价值,创造更大的经济效益。     

有机膨润土的制备

简要介绍了膨润土和有机膨润土特性与应用，介绍了以天然在膨润土为原料经过提纯，改性处理，制得有机膨润土的过程。     

改性膨润土对废水中染料的吸附

简述了膨润土的基本结构,概括了膨润土的主要改性方法,即活化改性法和添加改性剂改性法;分析了改性方法的主要优点,总结了改性膨润土对废水中染料的吸附效果.结果表明,改性膨润土对染料的吸附效果较好,染料去除率最大可达99.7％.另外,探讨了改性膨润土的吸附机理、影响因素和吸附等温式,并展望了改性膨润土的应用前景.     

膨润土的改性及其在重金属吸附中的研究进展

改性膨润土是近年来广受关注的重金属吸附剂。综述了焙烧、酸活化、无机、有机改性等途径对膨润土结构、吸附性能的改善效果,介绍了改性膨润土在重金属吸附处理中的应用情况。结合重金属废水处理的要求,指出了改性膨润土研究和应用中可能取得突破的几个方向。     

膨润土提纯进展

介绍了膨润土提纯方法及原理,主要为化学提纯法、水力分级提纯法、离心分离法、重液法和电泳法,并分析各提纯方法的优缺点,对膨润土的提纯给出若干建议。     

改性沸石和膨润土对氟离子吸附性能研究

选用高温焙烧、硫酸、硫酸镁改性天然沸石和膨润土,考察了3种改性方法对沸石和膨润土吸附氟离子性能的影响。实验结果表明,高温焙烧、硫酸改性和硫酸镁改性均提高了沸石和膨润土对氟离子的吸附能力。改性沸石对氟离子的吸附符合Langmuir等温吸附模型;硫酸改性、硫酸镁改性膨润土对氟离子的吸附可用Langmuir模型和Freundlich模型描述,高温焙烧改性膨润土对氟离子的吸附则符合Freundlich模型。     

Determination of pore water composition during long term interaction of bentonite substrates with water media: Comparative study

Knowledge of pore water composition is crucial information in research of long-term stability of bentonite and is also crucial for any stability predictions based on geochemical modeling. This paper reports validation results of two frequently used extraction methods — centrifugation and leaching. Three types of bentonite materials were used in our study. The first one was the Czech raw bentonite from the Rokle deposit. The second type of bentonite was “Mock-Up-Cz”, which is a mixture of bentonite material from the Rokle deposit with finely ground quartz and graphite powder. The third type of material was the FEBEX bentonite obtained from the Cortijo de Archidona deposit. All the bentonite samples were placed into pressure vessels and interacted with natural water during a one-year experiment. Free water, obtained during these interactions, was used as a comparative pore water composition for both of the extraction methods. The high water content in saturated bentonite, reaching about 50 m%, allowed the use of both methods. Concentrations of Mg^2 +, Ca^2 +, K⁺ and Na⁺ in water were determined. Centrifugation could be generally considered as a more suitable method because of the smaller differences between free water composition and concentrations obtained from extracted pore water compared to the leaching method. However, actual differences will depend on the type of bentonite and on the composition of the water media. In some cases, the leaching method yields better results. Leaching usually leads to higher concentrations of alkali metals and lower concentrations of alkaline earth metals. This indicates that bentonite substrates are sensitive to the change of external conditions and quickly interact with the water media.     

有机改性膨润土制备及其用于改性沥青的研究进展

有机膨润土在沥青中形成剥离型结构,因此能够有效提高沥青的高低温性能、抗老化能力.针对膨润土的结构与特性进行了介绍,综述了有机膨润土的制备方法与有机膨润土的改性机理,阐述了有机膨润土单一改性与复配改性沥青的作用与机理,并对有机膨润土改性沥青的发展与研究方向进行了展望.     

Characterization of Pakistani purified bentonite suitable for possible pharmaceutical application

The aim of this study is to assess the suitability of Pakistani bentonite for its possible pharmaceutical use in raw and purified forms. The purified samples were obtained by two different methods i.e. simple sedimentation and classical NaCl treatment. Prior to bentonite application in pharmacy, it is imperative that they must comply with some general features as high mineral, chemical and microbial purity. The physicochemical properties especially gel formation and swelling capacity are also important to be tested to investigate its specific use. The mineralogical study reveals that the raw sample is bentonite containing mainly montmorillonite with minor contents of kaolinite, illite and quartz. The quartz impurities were removed by the purification methods as confirmed by the X-ray diffraction patterns and the other properties were also improved. In view of the fundamentals of major pharmacopeias for use of bentonite in pharmacy and considering the chemical composition, microbiological results we could designate a pharmaceutical acceptable denomination for Pakistani purified bentonite samples. The two purified samples vary in interlayer cations, chemical composition and other properties that would present different behavior in pharmacy. The studied bentonite in purified form could be used as suspending and disintegrating agent because of its excellent swelling capacity and sedimentation volume. The high cation exchange capacity, high surface area and pore size distribution suggest their use as a good adsorbent of drugs and a drug carrier in controlled drug release system.