Abstract:In this paper, we report a new and convenient method for the synthesis of insulating aerogel by recycling solid waste coal gangue, which can reduce the industrial production cost of silica aerogels and realize high value-added utilization of solid waste. Sodium silicate was prepared from a cheap industrial waste coal gangue as the precursor for silica aerogels, which was used for silica wet gel preparation by a one pot method; this method of solvent exchange/surface modification was carried out quickly by mech… Show more
“…In addition SiO2 has both quantum orbital effect and volume effect dual effect [9][10][11][12] , which is easy to fill in other materials to realize material composite, and in this way expand the functionality of materials [13][14][15][16] . Wei et al [17] , successfully prepared silica aerogel powder using onepot method with gangue as raw material. The specific surface area of the resulting material is as high as 700 m 2 /g, with a porosity of more than 90 %, which can effectively adsorb pollutants in air and water, but the related adsorption experiments were not continued to be explored.…”
High-value comprehensive utilization of coal gangue solid waste, reducing synthesis cost and environmental hazards has become an important research direction for green development. In this study, acid-alkali treated coal gangue was used as the silica source, and abundant cotton short staple in Xinjiang was used as the raw material of aerogel. Cellulose/SiO2 composite aerogels were prepared by sol-gel method using N-N methylenebisacrylamide (MBA) as cross-linking agent and hydrochloric acid (HCl) as catalyst. The samples were characterized and analyzed by XRD, SEM, FT-IR, XPS, EDS, BET, and mechanical property tests. The results show that the composites exhibit low density and high porosity. The density ranges from 0.177–0.371 g/cm− 3 with a high porosity of 88.7%. SEM and BET results showed that the composites showed a three-dimensional mesh structure, and the specific surface area was as high as 325.742 m2/g, with a pore size of 21.997nm, which is a mesoporous material. The adsorption performance of the composite aerogel was tested by choosing the dye methylene blue (MB) to simulate wastewater, and the results showed that the adsorption amount of MB was 81.3 mg/g, and the adsorption amount showed a tendency of increasing first and then decreasing with the increase of SiO2. It still showed good adsorption after 5 cycles of adsorption experiments. Therefore, the results of this study provide a good application prospect for composite aerogels and a theoretical basis for the development of low-cost novel advanced materials.
“…In addition SiO2 has both quantum orbital effect and volume effect dual effect [9][10][11][12] , which is easy to fill in other materials to realize material composite, and in this way expand the functionality of materials [13][14][15][16] . Wei et al [17] , successfully prepared silica aerogel powder using onepot method with gangue as raw material. The specific surface area of the resulting material is as high as 700 m 2 /g, with a porosity of more than 90 %, which can effectively adsorb pollutants in air and water, but the related adsorption experiments were not continued to be explored.…”
High-value comprehensive utilization of coal gangue solid waste, reducing synthesis cost and environmental hazards has become an important research direction for green development. In this study, acid-alkali treated coal gangue was used as the silica source, and abundant cotton short staple in Xinjiang was used as the raw material of aerogel. Cellulose/SiO2 composite aerogels were prepared by sol-gel method using N-N methylenebisacrylamide (MBA) as cross-linking agent and hydrochloric acid (HCl) as catalyst. The samples were characterized and analyzed by XRD, SEM, FT-IR, XPS, EDS, BET, and mechanical property tests. The results show that the composites exhibit low density and high porosity. The density ranges from 0.177–0.371 g/cm− 3 with a high porosity of 88.7%. SEM and BET results showed that the composites showed a three-dimensional mesh structure, and the specific surface area was as high as 325.742 m2/g, with a pore size of 21.997nm, which is a mesoporous material. The adsorption performance of the composite aerogel was tested by choosing the dye methylene blue (MB) to simulate wastewater, and the results showed that the adsorption amount of MB was 81.3 mg/g, and the adsorption amount showed a tendency of increasing first and then decreasing with the increase of SiO2. It still showed good adsorption after 5 cycles of adsorption experiments. Therefore, the results of this study provide a good application prospect for composite aerogels and a theoretical basis for the development of low-cost novel advanced materials.
“…This Special Issue presents original research results in the following areas: the use of solar panels after the end of their life cycles in the production of cement composites [1]; the radioactivity of building materials in historical buildings [2]; the use of silicon nitride (Si 3 N 4 ) and silicon powder (Si) in the production of briquettes with defined properties [3]; the utilization of by-products of solid waste incineration in concrete production [4]; the comparison of the thermal conductivity of aerated concrete based on fly ash [5]; the utilization of by-products of the incineration of solid municipal waste in the production of foam concrete [6]; the mechanical properties of micropowder cement mortar and engineered cementitious composites (ECC), involving investigations of the use of different methods of processing for municipal solid waste incineration (MSWI) as a mineral admixture [7]; the use of marble dust and blast furnace slag in the production of self-compacting concrete [8]; a new method for the synthesis of insulating aerogel via recycling solid waste coal gangue, which has the potential to reduce the industrial production costs of silica aerogels and realize the high-value-added utilization of solid waste [9]; strength tests and numerical simulations of the Loess modified by desulfurization ash and fly ash [10]; research on the rheological properties of cement paste prepared using silica fume [11]; and, finally, research on the properties of cement paste prepared from superfine basalt powder [12].…”
This Special Issue, titled “Research and Development of Building Materials Based on Industrial Waste”, is focused on the preparation and description of the properties of new building materials based on industrial waste that are to be used in practice in civil engineering and engineering construction [...]
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