Doğan Mehmet, Alkan Mahir
Balikesir University, Faculty of Science and Literature, Department of Chemistry, 10100 Balikesir, Turkey.
J Colloid Interface Sci. 2003 Nov 1;267(1):32-41. doi: 10.1016/s0021-9797(03)00579-4.
The use of perlite for the removal of methyl violet from aqueous solutions at different concentration, pH, and temperature has been investigated. Adsorption equilibrium is reached within 1 h. The capacity of perlite samples for the adsorption of methyl violet was found to increase with increasing pH and temperature and decrease with expansion and increasing acid-activation. The adsorption isotherms are described by means of the Langmuir and Freundlich isotherms. The adsorption isotherm was measured experimentally at different conditions and the experimental data were correlated reasonably well by the adsorption isotherm of Langmuir. The order of heat of adsorption corresponds to a physical reaction. It is concluded that the methyl violet is physically adsorbed onto the perlite. The removal efficiency (P) and dimensionless separation factor (R) have shown that perlite can be used for removal of methyl violet from aqueous solutions, but unexpanded perlite is more effective.
研究了使用珍珠岩在不同浓度、pH值和温度下从水溶液中去除甲基紫的情况。1小时内达到吸附平衡。发现珍珠岩样品对甲基紫的吸附容量随pH值和温度的升高而增加，随膨胀程度和酸活化程度的增加而降低。吸附等温线用朗缪尔等温线和弗伦德利希等温线来描述。在不同条件下通过实验测量了吸附等温线，实验数据与朗缪尔吸附等温线拟合得相当好。吸附热的顺序对应于物理反应。得出结论，甲基紫是物理吸附在珍珠岩上的。去除效率（P）和无量纲分离因子（R）表明，珍珠岩可用于从水溶液中去除甲基紫，但未膨胀的珍珠岩更有效。
