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The adsorption of protein from model wine was investigated under different temperatures, pH values, contact times, and concentrations of ethanol, by certain bentonites. The results showed that ethanol molecules could broaden the protein molecules' channel to the interlayer of bentonite, and the maximum protein adsorption amount occurred under an ethanol concentration of 12% (by volume) and a pH value of 3.56. The increased single point Brunauer-Emmitt-Teller (BET) surface area (SBET) and adsorption pore volume (VAds) suggested a larger amount of active adsorption sites of the bentonite surface and a wider protein channel from the surface to the inner adsorption sites of bentonite, respectively. At the same time, higher methylene blue test (MBT) and swelling index (Sw) indicated that it was easy for the entrance of water and the absorbance of protein. Higher temperature was found favorable to eliminate more proteins and it took about 20 to 40min to arrive at the maximum adsorption. 相似文献
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The textural properties of acid-activated bentonite (AAB), which were prepared using four different concentrations of sulfuric acid, were analyzed by adsorption-desorption isotherm of nitrogen using an automated specific surface area and porosity analyzer. The total pore volume, specific surface area and average pore diameter of these four kinds of AAB show a regular changing trend, increasing first and then decreasing, the optimum of which can be achieved at a sulfuric acid concentration of 25% (sample A25). The kinetic analysis of the adsorption ofβ-carotene and chlorophyll in model oil solutions, namely, xylene and edible oil solution, has been investigated by using AAB. Experimental results indicated that the adsorption data fit the pseudo-second-order model well. The whole adsorption process of the two pigments on AAB was divided basically into two parts the initial adsorption of pigments was rapid in the first 10 min, followed by a slower adsorption process till equilibrium was attained at 60 min. In addition, the amount and rate of adsorption on A25 increase synchronously with the initial pigment concen-tration and temperature. The results showed that the adsorption kinetics behavior of AAB with respect to the pig- ments is not influence by the xylene and edible oil solution. 相似文献
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日月雷矿膨润土提纯影响因素分析及产品性能表征 总被引:3,自引:0,他引:3
利用物理和高速离心的方法对新疆夏子街地区日月雷矿膨润土进行提纯研究,考察了液固比、制浆时间、离心转速和离心时间等影响提纯效果的主要因素,结合正交实验确定出了日月雷矿膨润土提纯的最优条件。提纯后产品的品位有较大程度的提高,其膨胀容、蒙脱石含量、交换阳离子总量分别由53.8ml/g、68.5%、64.9mmol/100g提高到89ml/g、96.6%、98.4mmol/100g,而且Ca2+、Mg2+离子含量均有不同程度的降低。同时,样品的单层BET比表面积从57.99m2/g提高到71.14m2/g,有效吸附表面增大,改善了产品的吸附性能。 相似文献
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不同酸化剂对乌兰林格膨润土活化效果的影响 总被引:3,自引:0,他引:3
考察了不同加量的磷酸、硫酸和盐酸对乌兰林格白色钠基膨润土的活化效果,表明磷酸活化产品游离酸在0.302%~0.869%之间,远高于硫酸的0.026%~0.070%,其脱色率远低于硫酸、盐酸活化产品.硫酸和盐酸在加酸量分别为25%和30%时产品有最高的脱色率,综合考虑确定硫酸为最佳酸化剂.不同酸化剂活化产品的活性度和游离酸随着加酸量的增大而变化的趋势基本一致,活性度出现最大值时所需的加酸量比脱色率出现最大值时的要小,松散密度与脱色率总体呈反向变化趋势. 相似文献
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Bentonite produced in Xiazijie, Xinjiang (China) was characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TG) and cation exchange capacity (CEC). The bentonite is composed of dioctahedral montmorillonite with predominant quantity, certain amounts of quartz, feldspar and illite and minor amounts of kaolinite, gypsum, etc. The raw bentonite has a CEC of 0.6497 meq·g^-1 and allows to be characterized as typical sodium bentonite. In order to bleach cottonseed oil, optimum conditions for sulfuric acid activation of the raw bentonites were investigated, which were obtained by selecting various acid strength, at 96-98℃ and activating for 4h with 1 : 2 solid-liquid ratio. The acid activation bentonites were suitable for decolorization of cottonseed oil through removing carotene and chlorophyll. The bleaching capabilities of different pigments with activated bentonite with treatment of 25% sulfuric acid were 70.3%, 73.1%, 83.2%, 81.8% and 88.9%, respectively. Bleaching with acid activated bentonite gave oils lower peroxide values and acid values. 相似文献
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