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Research Journal of Applied Sciences

Year: 2013  |  Volume: 8  |  Issue: 2  |  Page No.: 143 - 147

Preparation, Characterization of Formic Acid Modified Clinoptilolite and Bacteria Adsorption

Qiujue Wu, Yuqin Wang, Zhanbin Wang, Yanmin Zhou and Tian Wang


Acid modified clinoptilolite are usually used as adsorbents for NH3, heavy metals and organic contaminants. Acid-modified clinoptilolite was prepared using the method of ion exchange reaction at 80°C for 4 h and used for bacteria and toxins adsorption which are significant for providing mechanism for the adsorption of microorganisms in vitro. XRD, SEM, AFM, BET and micropore volume were used to characterize parent clinoptilolite and acid modified clinoptilolite. Cation Exchange Capacity (CEC) was used to determine changes of adsorption ability before and after modification. The acid-modified clinoptilolite showed the strong adsorptive in the rang of 20-25 mg g-1 when the initial bacterial suspension concentration was 1x108 Colony Forming Units (CFU)/mL. The adsorption capacities of acid-modified clinoptilolite for all bacterial suspension increased with an increase of initial bacterial suspension concentration. An increase of adsorption capability of acid-modified clinoptilolite was attributed to the BET and micropore volume. These results indicated the competency of acid-modified clinoptilolite adsorbent for bacteria adsorption.