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• A Mesoporous humidity control materials was prepared from stone sludge and CRT waste panel glass. • Stone sludge and CRT waste panel glass comprises a substantial amount of extractable and processable alumino-silicate. • The Al-MCM-41 has abundant mesoporous, large specific surface area and pore volume. • Mesoporous in Al-MCM-41 is in favor of capillary condensation and moisture adsorption. • Amine-grafted Al-MCM-41 with humidity control capability was successfully prepared. This study sought to overcome the high energy consumption of mechanical dehumidifiers by synthesizing humidity control materials using alumino-silicate raw materials extracted from stone sludge and cathode ray tube (CRT) waste panel glass. The structure of the synthesized materials matches that of Mobil Composition of Matter No. 41 (MCM-41) mesoporous molecular sieves, which was subjected to amine functionalization using (3-Aminopropyl) triethoxysilane at various concentrations (2.5, 5, 7.5 vol.%). The resulting materials were characterized using X-ray fluorescence analysis, small angle X-ray diffractometry, Fourier transform infrared spectroscopy, transmission electron microscopy, the Brunauer–Emmett–Teller method, and 27Al solid-state nuclear magnetic resonance spectrometry. Al-MCM-41 molecular sieves with 5.0% grafted amine functional groups presented high specific surface area and high pore uniformity resulting in the highest equilibrium moisture content (39.4 kg/kg). The high thermal and humidity buffer capacity of the proposed material could greatly enhance the comfort of interior spaces without the energy consumption of mechanical dehumidifiers. [Display omitted] [ABSTRACT FROM AUTHOR]

This study used silicon carbide sludge (SCS) and waste glass fiber (WGF) to prepare SCS/WGF porous (SWP) eco‐fireproof materials by a hydrogen peroxide foaming agent. The results showed that the compressive strength of samples that were cured for 1 day and had an SCS replacement level of 10% and added amounts of WGF of 0.5% and 2.0% were 0.32 and 0.46 MPa, respectively. Additionally, it was observed that the stress–strain curves were relatively extended. WGF could improve the geopolymeric matrix of the composites in terms of formation and/or redistribution of cracks by bridging cracks and perforations within the matrix. When the added amounts of WGF were 0.5% and 2.0%, the reverse‐side temperatures of the samples were 238 and 262°C, respectively, which showed that adding an appropriate amount of WGF could effectively reduce the reverse‐side temperature of SWP eco‐fireproof materials. The results displayed the beneficial influence of SCS and WGF in improving bulking density, compressive strength, and flexural strength and in reducing porosity and thermal conductivity. Therefore, the results showed that SWP eco‐fireproof materials reinforced using SCS and WGF have potential as building materials. [ABSTRACT FROM AUTHOR]

• Extract the silicon and aluminum sources rich from stone sludge and CRT waste panel glass. • Surfactant (CTAB) is grafted on the mesoporous material to control the humidity. • Effectively synthesize low-cost and environmentally friendly mesoporous materials. There is a growing need for economical methods by which to reuse industrial waste. This paper reports on the recycling of industrial waste in the preparation of amine functionalized mesoporous molecular sieves (Al-MCM-41), for use as a building material applicable to the energy-free regulation of indoor humidity. The preparation of amine functionalized Al-MCM-41 for experiments involved combining stone sludge, cathode ray tube panel waste glass, an alkali agent (sodium hydroxide), and cetyltrimethylammonium bromide with aminopropyltriethoxysilane in various proportions. The water vapor adsorption of amine functionalized Al-MCM-41 (42.85 g/m2) far exceeded of amine functionalized Al-MCM-41 without surface grafting (28.64 g/m2). Al-MCM-41 with 2.5 vol% amine functional groups achieved the highest 24-h water vapor adsorption performance in compliance with JIS A 1470 standards. This research provides an economical approach to the recovery and recycling of industrial waste that is rich in silicon and aluminum. [ABSTRACT FROM AUTHOR]

During this analysis, liquid‐crystal display (LCD) waste glass containing high SiO2 and Al2O3 contents was investigated as an alternative source for the synthesis of a humidity‐conditioning Al‐MCM‐41 mesoporous molecular sieve (HC‐Al‐MCM‐41). The hydrothermal method of synthesis involved the use of supernatants of LCD glass waste and the cationic surfactant cetyltrimethylammonium bromide as a structural controller. Chemically examined LCD waste glass was used in the HC‐Al‐MCM‐41 preparation. Silicates were used as a matrix and as a source of Si and Al precursors in HC‐Al‐MCM‐41 preparation. HC‐Al‐MCM‐41 has a uniform pore network and a transparent, hexagonal arrangement of pores or honeycomb‐like structures synthesized at a hydrothermal temperature of 105°C. At 105°C and 120°C, the N2 adsorption‐desorption isotherms are commonly type IV, with the HC‐Al‐MCM‐41 sampling characteristics of the hysteresis chain. The HC‐Al‐MCM‐41 samples synthesized from LCD waste glass showed higher equilibrium moisture contents than mortars (0.8‐1.6 m3/m3) and bricks (0.3‐0.8 m3/m3) due to the ordered structure. When the hydrothermal reaction temperature was 105°C (relative humidity = 95%), HC‐Al‐MCM‐41 exhibited favorable mechanical properties and met JIS A 1475 intensity building materials specifications (equilibrium moisture content >5 m3/m3); therefore, HC‐Al‐MCM‐41 can be used in several applications, especially as a humidity‐conditioning material in construction. [ABSTRACT FROM AUTHOR]

This paper describes the use of sandblasting waste (SW) and solar panel waste glass (SPWG) as raw materials in the hydrothermal synthesis of Linde-type A zeolite (zeolite A) with crystallinity (83.89%) matching that of samples in the literature. ANOVA results indicated the following optimal synthesis parameters: crystallization temperature (120 °C), crystallization time (36 h), and Si/Al molar ratio (SAMR = 2.0). Model fitting results (R2 = 0.94) revealed a strong correlation between our regression results and experiment results, with the P value meeting the 95% confidence level. Experiment results confirmed the efficacy of the proposed hydrothermal processing method in synthesizing zeolite A using SPWG and waste SW as raw materials. [Display omitted] • Zeolite A (SZ) synthesized from solar panel waste glass and sandblasting waste. • Achieving the crystalline SZ with crystallinity of 83.89% at 120 °C and 36 h. • Model fitting results (R2 = 0.94) revealed a correlation between regression results and experiment results. • This study explains the crystallization mechanism of zeolite A synthesized from waste materials. • All major components of solar panel waste glass and sandblasting waste were utilized fully. [ABSTRACT FROM AUTHOR]

This paper examines the synthesis of zeolite A via hydrothermal alkali fusion using liquid crystal display waste glass (LCDWG) and sandblasting waste (SB). The design of the experiments was determined using the Box-Behnken method in conjunction with response surface design. Three factors were shown to have a pronounced effect on synthesis outcomes: (i) Si/Al molar ratio, (ii) crystallization temperature, and (iii) crystallization period. Synthesis parameters were optimized in accordance with the crystallinity (%) of the zeolite. XRD results revealed that increasing the Si/Al ratio improved the crystallinity and phase purity of the synthesized zeolite A. Increasing the crystallization temperature altered the crystal type and enhanced crystal purity; however, excessive temperatures reduced crystallinity and led to decomposition of the zeolite A phase. SEM results revealed that the resulting zeolite A possessed a cubic structure. ANOVA revealed that the Si/Al molar ratio had the most profound effect on the synthesis of zeolite A, followed by crystallization duration and crystallization temperature. The fact that the R2 value (0.95) was similar to the adjusted R2 value (0.8736) confirmed the efficacy of the proposed polynomial model. A highly significant F-value of 11.75 confirmed that the proposed model could be used for design purposes. The excellent water adsorption/desorption performance of the proposed zeolite A (49.83 g/ m2; meeting JIS A 1470 standards) indicates its suitability as a low-cost construction material for a variety of applications. The ultimate objective of this study was to overcome difficulties encountered in the disposal of industrial waste by converting LCDWG and SB into zeolite A. [Display omitted] • The LCDWG and SB were shown to be a feasible source of Al 2 O 3 and SiO 2 for the synthesis of zeolite A. • The DOE was determined using the BBD method in conjunction with response surface design. • This paper proposes a feasible model describing the crystallization of zeolite A. • Optimal zeolite A synthesis conditions included a Si/Al molar ratio of 2.0, temperature of 120°C, and synthesis time of 36 h. [ABSTRACT FROM AUTHOR]

• MCM-41 was prepared from liquid crystal display waste glass and chemical mechanical polishing sludge via hydrothermal treatment. • Effect of different temperatures and liquid–solid ratio on the microstructure humidity control performance of MCM-41 were studied. • The environmental humidity control and high performance of the materials were observed. • The effective synthesis of mesoporous materials from photovoltaic industry waste was developed. In this work, aluminum-containing MCM-41 mesoporous materials (ACMCM-41) were successfully prepared from liquid crystal display (LCD) waste glass and chemical mechanical polishing (CMP) sludge by a novel route for the reused of industrial waste. It can be inferred from the increase in the surface area, the introduction of an appropriate amount of aluminum retained the ordered mesoporous structure of the ACMCM-41 during the hydrothermal treatment process. Larger pore volume and specific surface area, as well as a great deal of mesopores distributed in the range of 3–20 nm can greatly contribute to the improvement of humidity control performance. ACMCM-41 was tested for its average equilibrium moisture content under different relative humidity of the material under water vapor adsorption/desorption. ACMCM-41 showed excellent humidity control performance (61.18 m3/ m3). The possibility of synthesis zeolite from the residual solid after aged was also discussed. The residual solids can be reused as suitable raw material for the synthesis of zeolite. [ABSTRACT FROM AUTHOR]

In this study, liquid crystal display waste glass (LCD wg) and chemical mechanical polishing sludge (CMP s) were investigated as alternative sources of SiO 2 and Al 2 O 3 for the preparation of the mesoporous moisture regulation material Al-MCM-41 (MRMCM). The aluminosilicate supernatant from the alkali fusion of LCD wg and CMP s and the surfactant cationic cetyltrimethylammonium bromide (CTAB) were used as structure-directing agents. Synthesis was carried out by alkali fusion and hydrothermal methods, and the factor affecting the synthesis was the alkali fusion liquid-solid ratio. Reliable instruments and methods, including XRD, TEM, XRF, BET and BJH, were employed for characterization of the fabricated MRMCM. The results show that the pore size of these materials was between 3.0 and 4.5 nm, and with an increase in the liquid-solid ratio, the specific surface area of MRMCM increased to a maximum value of 1260 m2/g and exhibited a mesoporous structure. In addition, the hydrothermal temperature and the specific surface area also had a significant positive correlation as the temperature increased such that the surface area increased from 370 m2/g to 601 m2/g, which is a significant increase of 1.62 times. MRMCM exhibited a positive linear correlation between pore volume and specific surface area during 48 h of moisture absorption and desorption, and the amount of moisture absorbed by mesoporous MRMCM was determined. Thus, the mesoporous molecular sieves met Japan Industrial Standard JIS A 1470–1 2002, which regulates moisture regulation building materials (response to humidity variation > 29 g/m2). Therefore, the materials can be utilized in multiple applications, particularly as moisture regulation materials in building engineering. Image 1 • A new type of Al-MCM-41 mesoporous humidity control material is reported. • The influence of the liquid-solid ratio and hydrothermal temperature are discussed. • High adsorption/desorption capacity of water molecule were observed. • The mesoporous molecular sieves met Japan Industrial Standard JIS A 1470. [ABSTRACT FROM AUTHOR]