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25 results on '"Shi, Bi"'

7. Flame-Retardant and Smoke-Suppressed Silicone Foams with Chitosan-Based Nanocoatings

Author

Shi-Bi Deng, Zhi-Jie Cao, Wang Liao, Yu-Zhong Wang, and Jun-Chi Yang

Subjects
Smoke, Thermogravimetric analysis, Materials science, General Chemical Engineering, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Industrial and Manufacturing Engineering, 0104 chemical sciences, Limiting oxygen index, chemistry.chemical_compound, Silicone, Montmorillonite, chemistry, Chemical engineering, 0210 nano-technology, Pyrolysis, Ammonium polyphosphate, Fire retardant
Abstract

Flexible silicone foams (SiFs) are high-performance but flammable materials that emit dense smoke in a fire. Two type of low-cost, eco-friendly nanocoatings, i.e., chitosan (CH)/ammonium polyphosphate (APP) and CH/montmorillonite (MMT), were fabricated on SiFs through a layer-by-layer (LbL) assembly. With seven bilayers (BL) of CH/APP coatings, the limiting oxygen index (LOI) increases from 20.2% to 23.8%, the peak heat release rate (pHRR) decreases by 27.6%, and the total smoke production (TSP) decreases 42%. Further deposition of CH/APP, however, partly damaged the fire resistance. In contrast, fire hazard and smoke release of CH/MMT coated SiFs were monotonously reduced. Every 7 BL of coating leads to ca. 12% reduction of TSP. Moreover, thermogravimetric analysis (TGA) was used to follow the pyrolysis of the coated foams, and scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDX) were applied to analyze the char residues systematically.

Published
2016

25. Novel g-C3N4/C/Fe2O3Composite for Efficient Photocatalytic Reduction of Aqueous Cr(VI) under Light Irradiation

Author

Zhao, Liming, Guo, Lijun, Tang, Yuling, Zhou, Jianfei, and Shi, Bi

Abstract

Research on the rational design of photocatalysts for efficient hexavalent chromium (Cr(VI)) reduction from Cr(VI)-containing wastewater has attracted widespread attention. In this paper, a novel g-C3N4/C/Fe2O3photocatalyst was successfully synthesized by anchoring g-C3N4nanosheets onto C/Fe2O3that was prepared using collagen fiber as the biochar resource following the Fe tanning mechanism to reduce Cr(VI) under artificial solar irradiation. Under the same conditions, the as-prepared g-C3N4/C/Fe2O3photocatalyst exhibited higher Cr(VI) reduction efficiency than g-C3N4, and the Cr(VI) reduction efficiency increased as Fe content in the g-C3N4/C/Fe2O3photocatalyst increased. The enhanced photocatalytic performance was primarily ascribed to the formation of an indirect Z-scheme heterojunction between C/Fe2O3and g-C3N4, which improved the separation efficiency of the photogenerated charge carrier. Furthermore, radical trapping indicated that photoinduced electrons (e–) were the main factor for Cr(VI) reduction. This work provides guidance for high value-added utilization of collagen fiber in constructing efficient light-driven photocatalysts and practical Cr(VI) removal from wastewater.

Published
2021
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