期刊
CLAYS AND CLAY MINERALS
卷 59, 期 5, 页码 459-465出版社
CLAY MINERALS SOC
DOI: 10.1346/CCMN.2011.0590503
关键词
Adsorption; Ammonium; China; Vermiculite
资金
- National Program of Control and Treatment of Water Pollution [2009ZX07424-002]
- School of Water Resources and Environment of China University of Geosciences
Vermiculite is a common layered silicate clay mineral which has good adsorption and ion-exchange properties, and which is used to remove pollutants from groundwater. The adsorption by vermiculite from Heibei Province, China, of low-concentration ammonium in water was assessed here to evaluate the effects of adsorption time, particle size, adsorbent dose, pH, and temperature. Using Fourier-transform infrared spectroscopy, the concentration of NH4+ at 1430 cm(-1) was evaluated after ammonium was adsorbed by vermiculite. Based on Langmuir-model analysis, the adsorption capacity of the Chinese vermiculite (in the particle-size range 0.025-0.075 mm) for ammonium was 18 mg/g after 3 h of equilibration. Optimal adsorption occurred at pH 6-7 and 60 degrees C, which is different from that at high ammonium concentrations. Smaller particle-size fractions showed greater degrees of adsorption. Increase in Mg2+, K+, or Na+ concentrations influenced ammonium adsorption and, therefore, indicated that cation exchange was the mechanism for ammonium uptake from low-concentration solutions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据