Synthesis of valuable Hydroxysodalite(HsL) from the waste fly ash by usingopen hydrothermal method.Synthesized HsLwas characterized using Fourier Transform Infrared spectroscopy, X-ray diffraction, Thermogravimetric analysis, Transmission Electron and Scanning Electron Microscopies. HsLwas applied for remediation of toxic dye, Rhodamine B (RhB) from aqueous solution through method of adsorption. The batch adsorption study such as effect of pH, contact time and effect of concentration on adsorption of RhB on synthesized HsLwas conducted to determinesaturation adsorption condition. After adsorption of RhB on Synthesized HsL were also characterized using Fourier Transform Infrared spectroscopy, X-ray diffraction and Scanning Electron Microscopies. Pseudo second order kinetics and Langmuir adsorption isotherm was well fitted in case of remediation of RhB. Synthesized HsLhave shown more uptake efficiency of RhB dye, which is about 1032.5μgg-1of HsL at pH 8. Therefore, Synthesized HsLis considered to be efficient and economical adsorbent material for the remediation of RhB.