Abstract
Mesoporous Al/MCM-41 was synthesized by extracting silicon carbide sludge and granite sludge as the sources of silicon and aluminum. Different concentrations of aminosilane (2.5, 5, 7.5 vol.%) were used to reflux the grafted NH2-Al/MCM-41 with amine functional groups (NH2-Al/MCM-41). The physical and chemical characteristics were analyzed. The results confirmed that silicon carbide sludge and granite sludge can effectively synthesize Al/MCM-41 with low cost and environmental protection. Reflow grafted amine functional groups can effectively improve the surface properties of NH2-Al/MCM-41. The moisture adsorption and desorption capacity of grafted NH2-Al/MCM-41 with amine functional groups was also studied. Based on moisture adsorption and desorption capacity, the surface properties of NH2-Al/MCM-41 were studied. When 5 vol.% of NH2-Al/MCM-41 amine functional groups is added, the moisture adsorption and desorption capacity is best. When the relative humidity = 95%, the equilibrium moisture content is 39.4 kg/kg, which complies with the standard of Japanese Industrial Standard (JIS A 1475). Therefore, the use of waste derived from the industry to replace expensive commercial materials was simple and environmentally friendly, and the grafted NH2-Al/MCM-41 with amine functional groups can be utilized in multiple applications, particularly as moisture regulation materials in building engineering.
Highlights
Accepted: 21 November 2021The development of urban and rural areas has been accompanied by a concentration of urban populations, and the intensive expansion of high-rise buildings has resulted in the production of large amounts of waste in related industries
The mesoporous silica nanomaterials studied in this article were prepared by alkali fusion and hydrothermal methods from solid waste generated in industrial processes
The grafted NH2-Al/MCM-41 without amine functional groups is spherical in appearance and exhibits agglomeration of fine particles, which is a typical form of mesoporous materials [20]
Summary
The development of urban and rural areas has been accompanied by a concentration of urban populations, and the intensive expansion of high-rise buildings has resulted in the production of large amounts of waste in related industries. SiC is mixed with a small amount of Al2 O3 , and the wastewater product is processed to produce a large amount of SiC sludge, which causes serious environmental pollution. In order to promote its recycling, SiC sludge and GS should be manufactured into high value-added products, such as novel humidity control material. This research will try to synthesize regular morphological mesoporous materials from mixed SiC sludge and GS and functionalize them with amine functional groups to improve the hydrophilic properties of the materials. The purpose is to increase the potential for large-scale recovery and reuse of mixed sludge waste in the sludge treatment industry in the future. The method provides low-cost production and and recycles the industrial solid waste to the environment
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