Experimental and theoretical studies on the removal mechanism of formaldehyde from water by mesoporous calcium silicate
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perimental and theoretical studies on the removal mechanism of formaldehyde from water by mesoporous calcium silicate *
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WANG ManMan, FAN BaoMin , WEN BianYing & JIANG Chao School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China Received October 2, 2019; accepted December 13, 2019; published online May 18, 2020
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 2 −1 (1.95), large specific surface area (122.83 m g ) 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. chemical adsorption, mechanism, molecular dynamics simulation, mesoporous calcium silicate, formaldehyde Citation:
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Wang M M, Fan B M, Wen B Y, et al. Experimental and theoretical studies on the removal mechanism of formaldehyde from water by mesoporous calcium silicate. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-019-1504-7
Introduction
Adsorption, with advantages of high efficiency and low operation cost, plays a critical role in the removal of hazards in the environment. Most porous materials with high specific surface area and diverse internal pore structures, such as activated carbon [1], diatomite [2], zeolite [3] and metal organic frameworks (MOFs) [4], have been widely used in the field of adsorption. Porous adsorbents involve both organic and inorganic specimens. Organic porous materials have excellent selective adsorption but the manufacturing process is usually complex. For instance, MOFs, as typical organic adsorbents, have excellent selective adsorption performance for some substance with the adjustable chemical *Corresponding authors (email: [email protected]; [email protected])
composition and pore size [5]. However, the syntheses of MOFs are complicated and expensive, which limit the practical applications. Compared with most organic counterparts, inorganic adsorbents exhibit extraordinary performance in removing contaminants due to their resistance to heat
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