Phenolic compounds and their derivatives are major water pollutants because of their wide usage in industry and agriculture. The widespread application of synthetic dyes in various manufacturing processes has been found responsible for degraded water quality. Ordered Mesoporous Carbon (OMC) has attracted much attention due to its unique features, such as high BET surface area, uniform pore size, large pore volume, and high thermo-mechanical stability. The virgin OMC was modified, employing pore size modification and surface modification using boric acid, cerium(III) chloride, and neodymium(III) chloride. The modified OMCs were characterized using nitrogen adsorption-desorption isotherm, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectra, and X-ray photoelectron spectroscopy (XPS). The adsorption capacity of all modified OMCs was evaluated by conducting batch adsorption experiments. The adsorption kinetics and adsorption isotherm data were fitted with different models. The maximum adsorption capacity was calculated and compared with materials reported in the available literature. The modification of OMC with cerium(III) chloride improved the adsorption capacity by 76.8%. The modification of OMC using neodymium(III) chloride increased the adsorption capacity by 40%.