Samlping of Benzene in the Air Using Natural Modified Iranian Zeolite (Purpose Is Replacing of Activated Carbon)

In this research, adsorption of benzene's vapor on natural Iranian zeolite modifiedby hydrochloric acid at different qualifications was studied. Samples of natural Iranian zeolite (Clinoptilolite) from Semnan were prepared, then their crystal structure was identified using X- Ray Diffraction analysis (XRD). The samples were crushed, sieved in different sizes. Zeolite samples were modified using 1N HCl solution with solid:solution ratio 1:25. Modified zeolites were used for preparing sampling tubes, and these tubes used in static method to study the effect of different parameters for adsorbing benzene upon zeolite. Breakthrough points in various qualifications (mesh, flow rate, mass, concentration,and temperature) were specified. In general, the obtained results showed that nutural zeolite modified by HCl has acceptable efficiency for sampling benzene, and has adsorption capacity at low concentrations (< 500
ppm) about 1.92 mg benzene/g zeolite and results showed that the optimum qualifications for sampling benzenein the air using natural modified zeolite: mesh: (60/80), mass: (800,200 mg), flow rate:
50 mL/min, and temperature 25 ºC.