Removal of Phenol Pollutants by Modification Molecular Sieves 13X


Molecular sieves type 13X was modified by treatment with saturated solution of urea or thiourea and adding of sodium silicate as binder to give homogeneous admixture in approximate weight percent, 20% urea or thiourea, 30% binder, and 50% MS13X. The samples were dried and shaped in cylindrical particles of about 5mm diameter and 4-8mm length. The FTIR studies show some interaction between the added urea and thiourea with the original substrates. These are mainly hydrogen band type interactions through –NH2 moiety with –OH group of framework oxygen inthe substrate or with adsorbed water. The urea displayed more significant interaction with MS13X than thiourea. Molecular sieve 13X and its admixtures with urea and thiourea showed good ability to remove phenol from water. The urea modified sample, which has the largest surface area, was the best adsorbent for phenol followed by thiourea treated sample. Excellent degree of phenol removal, greater than98% was achieved by using 0.2 l/h flow rate of 10ppm phenolic solution and 56cm bed length at 300C. The increasing of inlet phenol concentration in water affected largely the driving force and the rate of adsorption, resulted also in higher capacities. While the percentage removal of phenol was decreased by fixed other operating conditions