茶叶渣对孔雀石绿吸附性能研究

研究了茶叶渣对孔雀石绿(MG)的吸附性能、等温吸附模型和吸附动力学。分别考察了吸附时间、pH值、茶叶渣投加量、孔雀石绿初始浓度、温度等因素变化对孔雀石绿吸附效果的影响。结果表明,吸附时间4 h,茶叶投加量2 g/L,中性条件下就能达到较好的孔雀石绿去除效果。茶叶渣对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为79.37 mg/g。吸附动力学符合准一级、准二级动力学模型。茶叶渣对孔雀石绿的吸附是吸热过程。     

茶叶渣对孔雀石绿吸附性能研究

研究了茶叶渣对孔雀石绿(MG)的吸附性能、等温吸附模型和吸附动力学。分别考察了吸附时间、pH值、茶叶渣投加量、孔雀石绿初始浓度、温度等因素变化对孔雀石绿吸附效果的影响。结果表明,吸附时间4 h,茶叶投加量2 g/L,中性条件下就能达到较好的孔雀石绿去除效果。茶叶渣对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为79.37 mg/g。吸附动力学符合准一级、准二级动力学模型。茶叶渣对孔雀石绿的吸附是吸热过程。     

交联淀粉对孔雀石绿吸附性能研究

制备了羧甲基交联淀粉作为吸附剂,研究了其对孔雀石绿(MG)的吸附性能,进行最佳条件的探讨。考察了吸附接触时间、pH值、交联淀粉的投加量、孔雀石绿的初始染料浓度和不同温度变化对交联淀粉吸附MG的影响,并对吸附等温式和吸附动力学方程等进行了分析。结果表明,高温更利于交联淀粉吸附MG。吸附等温式和吸附动力学过程更符合Freundlich吸附等温式和准二级动力学模型,最大吸附量q_m为769.23 mg/g(298 K)。     

孔雀石绿在高岭土上吸附行为和模型研究

研究了孔雀石绿(MG)在高岭土上的吸附行为、等温吸附模型和吸附动力学。分别考察了吸附时间、p H值、高岭土投加量、孔雀石绿初始浓度等因素对孔雀石绿去除的影响。结果表明,吸附时间30 min,高岭土投加量16 g/L,中性条件下就能达到较好的孔雀石绿去除效果。高岭土对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为5.37 mg/g。吸附动力学符合准二级动力学模型。     

孔雀石绿在高岭土上吸附行为和模型研究

研究了孔雀石绿(MG)在高岭土上的吸附行为、等温吸附模型和吸附动力学。分别考察了吸附时间、p H值、高岭土投加量、孔雀石绿初始浓度等因素对孔雀石绿去除的影响。结果表明,吸附时间30 min,高岭土投加量16 g/L,中性条件下就能达到较好的孔雀石绿去除效果。高岭土对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为5.37 mg/g。吸附动力学符合准二级动力学模型。     

厌氧颗粒污泥对水中孔雀石绿的吸附行为

研究吸附时间、pH、污泥投加量和温度等对厌氧颗粒污泥吸附水中孔雀石绿(MG)的影响.结果表明,在MG初始浓度为50mg/L和60mg/L时,平衡时间为30 min,在MG初始浓度为70 mg/L和80 mg/L时,平衡时间为50 min;在MG初始浓度为100 mg/L时,厌氧颗粒污泥吸附水中MG的最佳pH为6～8,最...     

厌氧颗粒污泥对水中孔雀石绿的吸附行为

研究吸附时间、pH、污泥投加量和温度等对厌氧颗粒污泥吸附水中孔雀石绿(MG)的影响。结果表明,在MG初始浓度为50 mg/L和60 mg/L时,平衡时间为30 min,在MG初始浓度为70 mg/L和80 mg/L时,平衡时间为50 min;在MG初始浓度为100 mg/L时,厌氧颗粒污泥吸附水中MG的最佳pH为6～8,最佳投加量为2.4 g/L(干重);厌氧颗粒污泥对MG的吸附能力随温度增加而增加,在40℃时最大吸附容量为137.696 mg/g。厌氧颗粒污泥对水中MG的吸附可以采用Redlich-Peterson模型进行描述,表明厌氧颗粒污泥对MG的吸附并非理想的单层吸附,而是物理吸附和生物化学吸附共同作用的结果;MG与厌氧颗粒污泥作用的速率取决于化学吸附,其中液膜内扩散速率是限制厌氧颗粒污泥对MG吸附的主要因素。     

膨润土负载壳聚糖吸附剂对苯酚的吸附性能研究

将壳聚糖与膨润土复合制得一种固体吸附剂(CCB),并用于水溶液中苯酚的吸附。详细研究了吸附体系中溶液pH值、苯酚起始浓度对吸附的影响,将吸附平衡数据用Langmuir和Freundlich方程进行对比分析。结果表明:温度为25℃的条件下,溶液pH值为4.0时,吸附容量最大,达到63.69 mg/g;吸附量随苯酚起始浓度的增大而增大,吸附过程符合Langmuir和Freundlich模型,其中Langmuir模型更为适合。     

改性膨润土对污水中镉离子的吸附去除效率

采用内蒙赤峰膨润土进行焙烧改性,考查了改性膨润土对水溶液中Cd^2＋的吸附性能。试验表明：钙基膨润土经450℃焙烧2．5h后,在pH值=5,吸附时间为25min时,对金属Cd^2＋离子的饱和吸附效率达83％;焙烧前后XRD分析显示膨润土保持了完善的层间结构和化学结构。     

膨润土对汞的吸附性能研究

试验了时间,ｐＨ,用量等对膨润土吸附汞效果的影响,还将有机膨润土与膨润土吸附絮凝对汞的处理作了比较,结果表明,利用廉价的天然膨润土作为吸附剂,用吸附混凝土法处理含汞废水有较高的应用价值。     

A Novel Pinus Tabulaeformis Based Adsorbent for the Removal of Malachite Green

Pyrolytic char treated with muffle furnace (TPC), a novel adsorbent, were investigated to enhance its adsorption capacity of malachite green (MG) dye. In addition, the dye adsorption behavior of the TPC in aqueous solution was investigated. The treatment temperature, treatment time, and the particle size of PC had a positive effect on the dye adsorption capacity of TPC. Equilibrium data was fitted well with Langmuir and Redlich-Peterson models with maximum adsorption capacity of 91.24, 111.27, and 119.01 mg g^?1 at 293, 303, and 313 K, respectively. The kinetic of adsorption was found to confirm to the Elovich equation with good correlation and the overall rate of MG uptake was found to be controlled by film diffusion, pore diffusion and particle diffusion. The Boyd plot confirmed that the external mass transfer was the rate-limiting step in the adsorption process. Different thermodynamic parameters have also been evaluated and it was found that the adsorption was spontaneous, feasible, and endothermic in nature. Adsorbents could be regenerated using 0.1 mol L^?1 NaOH solution at least three cycles, with up to 90% recovery. The TPC used in this work proved to be an effective material for the treatment of MG bearing aqueous solutions.     

以酸活化膨润土催化合成阿司匹林

以水杨酸和乙酸酐为原料,在自制酸化膨润土催化下合成了阿司匹林;探讨了催化剂的结构特征及最佳催化条件。结果表明：酸化膨润土对阿司匹林的合成具有良好的催化活性;在最佳工艺条件下,收率可达：90．44％。     

膨润土对核素的吸附行为研究

介绍了内蒙古高庙子膨润土的EDXRF分析,得到了内蒙古高庙子膨润土的元素构成,并论述了近几年膨润土对核素的吸附行为研究,主要影响因素包括:pH值、吸附时间、温度、离子强度、无机离子、腐殖酸等。并对每种影响因素对不同核素的影响效果进行了总结。     

Enhanced adsorption of malachite green onto carbon nanotube/polyaniline composites

To enhance adsorption of organic dyes like malachite green (MG) onto polymeric absorbents, we prepared carbon nanotube (CNT) filled polyaniline (PANI) composites with large surface areas by simply using entangled CNTs as porous frameworks during PANI polymerization. Adsorption behavior of the CNT/PANI composites in MG solutions was experimentally investigated and theoretically analyzed. The CNT/PANI composites exhibit much higher equilibrium adsorption capacity of 13.95 mg g^?1 at an initial MG concentration of 16 mg L^?1, increasing by 15% than the neat PANI, which is mainly attributed to large surface areas and strong CNT‐PANI interactions of the composites. In addition, theoretical analyses indicate that the adsorption kinetics and the isothermal process of the composites can be well explained by using the Ho pseudosecond‐order model and the Langmuir model, respectively. In light of their high MG adsorption and easy operation, the CNT/PANI composites have great potential as high‐efficiency adsorbents for removal of dyes from wastewater. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Effects of experimental variables on phosphate adsorption on bentonite

The adsorption process of phosphate ions on a bentonite from Almería (East-Andalucía, Spain) was studied at 30°C over a range of experimental conditions such as saline (0.1 M KCl) or non-saline medium, natural or calcium homoionic bentonite and different pH values. In order to calculate the adsorption capacities (X_m) of the samples, the experimental data points were fitted to the Langmuir equation. X_m values ranged from 0.42 μg P g^?1 for the natural sample in non-saline medium to 0.74 μg P g^?1 for the same sample in saline medium, the X_m value corresponding to the calcium homoionic bentonite sample being intermediate. At different pH conditions, X_m increased from 0.28 μg P g^?1 at a pH of 1.3 to 1.53 μg P g^?1 at a pH of 4.4, and then decreased to 0.42 μg P g^?1 at a pH of 8.7.     

Malachite green derivatives for two-photon RNA detection

The design, preparation and characterisation of a library of malachite green (MG) derivatives for two-photon RNA labelling is described. Some of these MG derivatives exhibit an increased affinity for an MG-aptamer, as well as improved two-photon sensitivity when compared to the classical malachite green chloride. The underlying mechanisms and potential benefits for in vivo RNA visualisation are discussed.     

Enhanced Adsorption of Malachite Green by EDTAD-modified Sugarcane Bagasse

Abstract

Ethylenediaminetetraacetic dianhydride (EDTAD) modified sugarcane bagasse (SB) was prepared and characterized by Fourier transform infrared spectroscopy (FTIR). Due to the presence of a large number of carboxyl groups, the adsorption capacity of the EDTAD modified SB (EDTAD-SB) for malachite green (MG) showed a significant increase compared with SB. Increase in ion strength of solution-induced decline of MG sorption. The maximum adsorption capacities were 157.2 mg g^?1 for MG, according to the Langmuir equation. Kinetic studies showed better correlation coefficients for a pseudo-second-order kinetic model, confirming that the sorption rate was controlled by a chemisorption process.     

四乙烯五胺接枝膨润土对酸性大红GR的吸附性能

在膨润土（Bent）表面接枝四乙烯五胺（TEPA）制备四乙烯五胺改性膨润土（TEPA/Bent）,利用FTIR（红外光谱仪）、XRD（X射线衍射仪）、EA（元素分析）、SEM（扫描电镜）和EDS（能谱仪）对其进行表征分析,并考察对水体中阴离子染料酸性大红GR的吸附性能。结果表明：TEPA成功接枝于膨润土表面,提高了膨润土对酸性大红GR的吸附量;pH对TEPA/Bent表面电位和吸附量影响较大;随着初始pH的增大,TEPA/Bent的zeta电位由正变为负,对酸性大红GR吸附量减少;在pH=3,染料初始质量浓度为100mg/L条件下,TEPA/Bent对酸性大红GR的吸附量可达44.63mg/g;TEPA/Bent对酸性大红GR的吸附动力学符合准二级动力学模型;吸附等温线符合Langmuir吸附等温模型,为单分子层吸附;吸附热力学表明该吸附为自发吸热过程。吸附剂经过5次再生后,吸附量仍保持为初始80%以上。研究表明,TEPA/Bent是从水溶液中去除阴离子染料的潜在有效吸附剂。     

孔雀石绿-硼酸体系的热变色性能研究

选用羧酸类溶剂,采用固相法合成了孔雀石绿-硼酸系列可逆热致变色材料.考察了孔雀石绿和硼酸的配比、羧酸类溶剂的种类与用量对其热变色性能的影响并探讨了材料的变色机理.结果表明,孔雀石绿-硼酸体系的最佳配比(质量比)为1∶100,最佳溶剂为丙二酸,且m(孔雀石绿)∶m(硼酸)∶m(丙二酸)=1∶100∶10时,颜料变色敏锐,色彩鲜艳,变色温度降低到65 ℃,复色时间为25 s,可逆性好.DSC检测颜料的热变色过程发现,样品在58～72 ℃之间出现一个强的吸热峰.复配物体系的变色机理可归结为分子间的电子得失机理.