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Most porous materials with high specific surface area and diverse internal structures possess good adsorption ability.In this work,a tremella-like mesoporous calcium silicate hydrate (CSH) with high adsorption capacity was successfully prepared via a facile hydrothermal method.The adsorption effect and adsorption mechanism of the as-prepared calcium silicate hydrate (APCSH) towards formaldehyde from water were investigated systematically.Results indicate that AP-CSH has high Ca/Si ratio (1.95),large specific surface area (122.83 m2 g-1) and exhibits excellent adsorption capacity.The results of batch adsorption experiments show that AP-CSH can remove formaldehyde from water rapidly and effectively with the maximum removal efficiency of 98.94%.The adsorption process agrees well with the pseudo-second-order and Freundlich isotherm model.Furthermore,regeneration can be achieved by simply immersing AP-CSH in absolute ethanol and the removal efficiency can still reach about 99.50% after five cycles.The adsorption mechanism was also studied by experimental analyses and molecular dynamics simulation.Both experimental results and theoretical simulation support that formaldehyde adsorption over AP-CSH belongs to chemical adsorption.