Compare Study of a New Type Adsorbent and 2 Traditional Adsorbents on Their Efficiency for As (V) Adsorption

Iron coated zeolite is made and its adsorption characteristics are compared with activated alumina and zero-valent iron to get further understand of the new adsorbent. The results show that iron coated zeolite removes As(V) in the similar with that by activated alumina with removal rate of 50% in first 5min's adsorption but slower after 60 mins' adsorption and faster than that by zero-valent iron during the whole adsorption process. Iron coated zeolite sorption fits Langmuir model the best. Capacities of activated alumina, iron coated zeolite and zero-valent iron for As(V) adsorption are 7.3mg/g, 3.9mg/g and 3.3 mg/g, respectively. XRD analysis shows that main components on the surface of the used iron coated zeolite in this paper is FeOOH. To improve the adsorption efficiency of iron coated zeolite, diameter of the zeolite should be decreased and iron should be coated more tightly on the zeolite.