Abstract
Construction waste, produced from building projects, was utilized to prepare chabazite by alkali fusion hydrothermal synthesis method. The synthesized chabazite was used as an adsorbent for the removal of methylene blue (MB). XRD, FTIR, and N2 adsorption/desorption curves were adopted to describe the physical and chemical properties of the samples. The results show that the synthesized chabazite possesses crystalline structure, typical functional groups, and large specific surface area of 421.34 m2 g-1. Adsorption isotherms and kinetic curves show that the adsorption process follows the Langmuir model and pseudo-second-order kinetics model. The maximum adsorption capacity of MB on the synthesized chabazite reaches up to 129.18 mg g-1 at 298 K, which is about 16 times that of construction waste. The removal rate of MB reaches more than 90%, and the adsorbed amount is about 35 mg g-1 after 1 h at 298 K. Thermodynamic parameters, namely [Formula: see text], [Formula: see text], and [Formula: see text] of -12.83 kJ mol-1, -27.37 J mol-1 K-1, and -4.68 kJ mol-1 at 298 K, respectively, indicate that the adsorption of MB on the chabazite is physical, orderliness-tended, and spontaneous process. Moreover, the synthesized chabazite has a good property of regeneration and reuse. The results indicate that using construction waste to prepare chabazite in application as an adsorbent is feasible, which provides a novel and environment-friendly way for recycling construction waste.
Highlights
In the process of urbanization, building projects have resulted in a large number of construction and demolition waste over the last few decades, and this situation will exist in the future in order to meet the growing urban population and higher standards of living [1]
The maximum adsorption capacity of construction waste at 298 K is only 8.36 mg g-1, while that of the synthesized chabazite reaches up to 129.18 mg g-1, which is more than 15 times that of construction waste
Construction waste was utilized as raw material for the preparation of chabazite to apply in water treatment
Summary
In the process of urbanization, building projects have resulted in a large number of construction and demolition waste over the last few decades, and this situation will exist in the future in order to meet the growing urban population and higher standards of living [1]. Construction waste has already become a serious problem in many countries. The overall utilization of construction waste in developing countries is relatively low. Recycling and reuse of construction waste are mainly used for backfilling of pits and for pavement base and subbase in road engineering. Construction waste can prepare recycled aggregate products, such as recycled aggregate floor tiles and permeable tiles, and prepare recycled concrete and mortar [5, 6]. Few other technologies of recycling and reuse of construction waste have been studied
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