Magnesium　silicate　nanoparticles　had　been　successfully　synthesized　with　a　chemical　precipitation　method　in　water　(MS)　and　alcohol-water　systems　(T-MS).　The　as-prepared　samples　feature　high　adsorption　performance　for　cationic　pollutants.　The　powder　X-ray　diffraction　analysis　(PXRD)　indicates　that　the　MS　and　T-MS　samples　are　amorphous,　and　SEM　and　TEM　reveals　that　the　both　samples　form　aggregation　comprising　of　nanoparticles　with　an　average　diameter　of　30　nm.　The　MS　nanoparticles　are　more　inclined　to　aggregate　as　cluster,　while　the　T-MS　nanoparticles　are　more　uniformly　distributed.　Their　adsorption　performance　was　evaluated　by　using　methylene　blue　(MB)　was　used　as　the　model　pollutant.　The　results　showed　that　the　T-MS　samples　reaches　adsorption　equilibrium　earlier.　The　maximum　adsorption　capacities　are　135　mg/g　and　117　mg/g　for　T-MS　and　MS　samples,　respectively.　In　addition,　the　competitive　adsorption　test　proves　that　the　adsorption　capacity　of　T-MS　for　MB　does　not　degrade,　even　with　the　presence　of　Methyl　orange,　Cl-,　SO42-　or　metallic　ions,　which　showed　the　T-MS　samples　feature　high　selective　removal　of　cationic　dyes.　Zeta　potentials　testified　that　the　electrostatic　interaction　dominated　the　adsorption　process.　This　work　not　only　provide　a　promising　absorbent　for　collecting　dye　pollutants,　but　also　offers　a　simple　method　for　large　scale　preparation　of　nanosized　magnesium　silicate.