Fe^(3+)/TiO_2负载膨胀珍珠岩降解水和土壤中苯酚的研究

DEGRADATION OF PHENOL IN WATER AND SOIL WITH Fe^(3+)/TiO_2 COATED EXPANDED PERLITE

以膨胀珍珠岩(EP)作为载体,采用溶胶凝胶法对其进行Ti O_2、Fe3+-Ti O_2溶胶负载,制备出Ti O_2、Fe3+-Ti O_2表面修饰的膨胀珍珠岩材料(TEP、FTEP),通过SEM、TEM、XRD和FI-IR对其进行表征,实验室条件下模拟研究了EP、TEP、FTEP对水和土壤中苯酚的吸附降解效果。结果表明,450℃光催化材料为锐钛矿型,Fe3+掺杂有效提高了光催化性。本实验条件中,当达到最佳投加量时,水和土壤中的EP、FTEP、TEP对苯酚的降解率分别为23.40%、100%、100%和17.81%、66.75%、69.01%;在最适光照时间下,水和土壤中的EP、FTEP、TEP对苯酚的降解率依次为22.14%、100%、100%和17.64%、66.15%、67.51%。在实验浓度范围内,该光催化反应符合一级反应动力学方程。

Expanded perlite（ EP） was selected as the carrier,and loaded Ti O_2 or Fe3 ＋-Ti O_2 by Sol-Gel method to make Ti O_2 or Fe3 ＋-Ti O_2surface-modified EP（ TEP、FTEP）. The materials characterization were evaluated by SEM,TEM,XRD and FI-IR.The adsorption and degradation of phenol in water and soil by EP,TEP and FTEP were studied in laboratory. The results showed that the photocatalytic materials were anatase type at 450 ℃,and Fe3 ＋improved the photocatalytic activity effectively. Under the experimental condition,with the optimal dosage,the degradation rates of phenol by FTEP,TEP and EP in water and soil were23. 40%,100%,100% and 17. 81%,66. 75%,69. 01%,respectively. At the optimal illumination time,the degradation rates of phenol by FTEP,TEP and EP were 22. 14%,100%,100% and 17. 64%,66. 15%,67. 51%,in water and soil,respectively. The reaction of photocatalysis for phenol in water and soil complies with as the first order kinetic mode.