Dispersion of kaolin particles with carboxymethylated xylan
Dispersion of kaolin particles with carboxymethylated xylan
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DOI：
10.1016/j.clay.2016.12.027
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发表时间：
2017-03-01
影响因子：
5.6
通讯作者：
Fatehi, Pedram
中科院分区：
文献类型：
--
作者：
Konduri, Mohan K. R.;Fatehi, Pedram
在这项工作中，系统研究了羧甲基化木聚糖（CMX）作为水性体系（20 g/L）中高岭土颗粒分散剂的性能。还确定了工艺参数（例如 pH 值和 CMX 剂量）对高岭土分散体的影响。吸附研究表明，在pH 6、15 mg/g CMX/高岭土、30℃、30 min的处理条件下，CMX在高岭土颗粒上的最大吸附量为2.48 mg/g。使用光度色散、垂直扫描分析和比浊法，在相同处理条件下发现高岭土分散体的最小 zeta 电位为 33 mV，稳定性最高。等温线和动力学研究表明，CMX 在高岭土颗粒上的吸附往往会显着影响高岭土分散体的 zeta 电位和相对浊度，但 zeta 电位并不一定预示高岭土分散体的高稳定性。 CMX 比未改性木聚糖 (UX) 和机械搅拌更能提高高岭土分散体的稳定性。 (C) 2016 Elsevier B.V. 保留所有权利。
In this work, the performance of carboxymethylated xylan (CMX) as a dispersant for kaolin particles in an aqueous system (20 g/L) was systematically investigated. The influence of process parameters, such as pH and CMX dosage, on the kaolin dispersions was also determined. Adsorption studies revealed that CMX had a maximum adsorption of 2.48 mg/g on kaolin particles under the treatment conditions of pH 6, 15 mg/g CMX/kaolin, 30 degrees C and 30 min. The minimum zeta potential of 33 mV and the highest stability for the kaolin dispersions were found under the same treatment conditions using photometric dispersion, vertical scan analysis and turbidimetry. Isotherm and kinetic studies revealed that the adsorption of CMX on kaolin particles tended to significantly impact the zeta potential and relative turbidity of the kaolin dispersion, but the zeta potential did not necessarily predict the high stability of the kaolin dispersion. CMX improved the stability of the kaolin dispersions more than unmodified xylan (UX) and mechanical stirring. (C) 2016 Elsevier B.V. All rights reserved.