The objective of this study was to investigate the removal of two organic pollutants; 4-hydroxybenzoic acid (p-hydroxybenzoic acid) and phenol from synthetic wastewater by the adsorption on mesoporous materials. In this context, the aim of this work is to study the adsorption of organic compounds phenol and 4AHB on MCM-41 and FSM-16 non-grafted (NG) and other grafted (G) by trimethylchlorosilane (TMCS). The results of phenol and 4AHB adsorption in aqueous solution show that the adsorption capacity tends to increase after grafting in relation to the increase in hydrophobicity. The materials are distinguished by a higher adsorption capacity to the other NG materials. The difference in the phenol is 14.43% (MCM-41), 14.55% (FSM-16), and 16.72% (MCM-41), 13.57% (FSM-16) in the 4AHB. Our adsorption results show that the grafted materials by TMCS are good adsorbent at 25 °C.
 Shu H-T., Li D., Scala A.A., Ma Y.H. Separation and Purification Techonology 11, 27-36- 1997.
 Perrich, J. R. "Activated carbon adsorption for wastewater treatment." (CRC press)-1981.
 Banat, F. A., Al-Bashir. Environmental Pollution 107, 391-398-2000.
 Jia, Q, Lua, A. C. Journal of Analytical and Applied Pyrolysis, 83, 175-179-2008.
 R. Mokaya.; W. Jones, Chem .Commun, 1839-1998.
 S. Inagaki, Y. Fukushima, K. Kuroda, J. Chem. Soc. Chem. Commun, 680-682-1993.
 X. S. Zhao and G. Q. Lu. J. Phys. Chem. B, 102, 1556-1561-1998.
 R. Qadeer, A. H. Rehan. Turk J Chem 26 .357-361-2002.