Title of article :
Modification of Nano Clinoptilolite Zeolite Using Sulfuric Acid and Its application Toward Removal of Arsenic from Water Sample
Author/Authors :
Shokrolahzadeh, Ali Islamic Azad University, Tehran , Shokuhi Rad, Ali Department of Chemical Engineering - Qaemshahr Branch - Islamic Azad University, Qaemshahr , Adinehvand, Javad Department of Chemical Engineering - Tehran North Branch - Islamic Azad University, Tehran
Abstract :
Zeolites are widely used in wastewater and contaminated water refinement due to their
great adsorption properties. However, Clinoptilolite (as one type of Zeolites) has a relatively
low adsorption capacity at least for arsenic ions. Therefore, in order to increase the
adsorption capacity, natural Clinoptilolite was modified with sulfuric acid and various tests
were then conducted to determine the best conditions for obtaining the maximum capacity
of adsorption. The results showed that parameters such as arsenic initial concentration,
adsorbent's particles size, adsorbent dosage and solution pH affect the adsorption capacity.
Arsenic maximum adsorption was obtained at pH 8. Furthermore, the maximum adsorption
capacity was found to be in an adsorbent modified with 1 M acid. The contact time or the time
of balance between the adsorbent and analyte was determined to be 240 min and the optimal
amount of Zeolite to obtain was determined to be 480 g/L. The rate of arsenic removal under
the optimal conditions is 27.69%. The modified Clinoptilolite capacity for arsenic adsorption
increased with reducing the adsorbent particles size to 0.5 mm. Besides, among the three
examined isotherms including the Langmuir, Freundlich and Dubinin-Radushkevich isotherms,
the Langmuir and Freundlich models well described arsenic adsorption. Considering the
more favorable adsorption efficiency of Clinoptilolite modified with sulfuric acid compared to
natural Clinoptilolite, the modified one can be proposed as an appropriate and inexpensive
adsorbent for arsenic removal in waste water refinement.
Keywords :
Clinoptilolite , Arsenic , Adsorption , Waste water , Sulfuric acid
Journal title :
Astroparticle Physics