科研之友
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摘要
Zeolite, as one of the clay minerals, has large specific surface area, which has superior anion species adsorption capacity by ion-exchange. The layer at the edge of lattice plane of zeolite was damaged during heating process, a considerable amount of mesopores was created, and the increase of the release rate of cations in zeolite leaded to the rise of ion-exchange efficiency of ammonium. The results indicated that ammonium removal rate was increased initially, reached a maximum at intermediate temperature and holding time, then decreased at high temperature and overtime. The results of XRD and FTIR suggested that the silicate skeleton of zeolite was not damaged, but 020 and 131 lattice plane was damaged with temperature increased. Temperature, pH and dosage were the key control factors in ammonium adsorption by modified zeolite, the optimum pH value and dosage for ammonium adsorption was 7 and 2 g, respectively. A negative interaction effects between temperature vs pH and dosage vs time was discovered among multi-variables of temperature, holding time, pH and dosage, and the interaction effects between others variables were weak.
