期刊：
Construction and Building Materials,2024年411:134825 ISSN：0950-0618
通讯作者：
Sun, DL
作者机构：
[Zou, Weihua; Wang, Zhangheng] Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410004, Hunan, Peoples R China.;[Sun, Delin; Song, Ling; Sun, Zhenyu; Zhao, Shan; Liu, Wenshuang; Yu, Minggong; Zou, Weihua; Liu, Fang; Wang, Zhangheng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Sun, Delin; Sun, DL] 498 Shaoshan South Rd, Changsha, Hunan, Peoples R China.
通讯机构：
[Sun, DL ] 4;498 Shaoshan South Rd, Changsha, Hunan, Peoples R China.
关键词：
Superhydrophobic wood;Wet chemical method;Wettability;Bond strength;Interface modification
摘要：
Superhydrophobic modification transforms the wood surface into a non-wetting state, which hinders the effective spreading and penetration of the adhesive at the gluing interface. In this study, a wet chemical method was used to optimize the wettability of the glued interface of superhydrophobic wood (S-wood) through NaOH@KH-550 synergistic treatment. The method can improve the structrue and chemical condition to increase the adsorption capacity of the wood surface for the adhesive, and the bond strength of S-wood increased to 3.21 MPa, which was beneficial to the efficient use of S-wood in construction and furniture fields.
摘要：
As green renewable resources, wood and its composites are widely used in the construction field, which puts forward higher requirements for their flame-retardant performance. In this study, a high-temperature hydrothermal crystallization method for in situ constructing an epoxy crosslinked Si-Al zeolite-like structural wood composite (WZLC) was reported. Under the action of amine guiding agents and epoxy resin, the zeolite-like catalytic structure constructed in poplar wood comprised negative electrocatalytic sites, which can efficiently catalyze the formation of the carbon layer and endow WZLC with excellent flame retardant, smoke-suppression, and self-extinguishing properties. Compared with the untreated wood (WN), the thermal stability of the treated wood (WZLC) was greatly improved, and the amount of volatile organic compounds released during the decomposition process was significantly reduced. The heat release rate, total heat release, smoke production rate, and total smoke production of WZLC1 decreased by 50.23%, 44.14%, 45.21%, and 28.46%, respectively. Particularly, CO and CO2 yields of WZLC significantly decreased by 92.26% and 92.02%, respectively, indicating that the Si-Al zeolite-like catalytic structure displayed excellent catalytic flame retardant properties, which can effectively decrease the thermal decomposition rate and combustion risk of the WZLC. This method uses less flame retardants to achieve a good flame retardant and smoke suppression effect, thereby reducing the risk of environmental pollution caused by too many flame retardants.
摘要：
When wood is used as a stressed component of building materials, the parts most prone to failure are the upper and lower surfaces which can be called the weak structure. In a hydrothermal environment, lignin and hemicellulose in wood readily soften and dissolve, thus leading to their designation as the weak structure. The weak structures results in the wood having a low strength. In this paper, the sandwich beam material can be obtained by two steps from the skin self-reinforcement method, whereby the weak structure of the wood surface was removed by the delignification, and then the wood surface was densified. The authenticity of the sandwich structure is proved by a scanning electron microscope (SEM) and density profile analysis. When the moisture content (MC) is 10%-12% and the mass loss ratio is 23.04%, the optimal resilience of the sandwich beam is only 1%, the maximum modulus of rupture (MOR) and modulus of elasticity (MOE) are 1.42 and 2.1 times greater than those of natural wood, respectively. This finding shows that our method strengthens the weak structure of natural wood, which has good flexural performance and springback ratio.
作者：
Peng, Dongmei;Zhang, Zhongfeng;Zhang, Jijuan;Yang, Yang
期刊：
Molecules,2023年28(15):5815- ISSN：1420-3049
通讯作者：
Zhang, ZF
作者机构：
[Zhang, Jijuan; Zhang, Zhongfeng; Peng, Dongmei; Yang, Yang] Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410000, Peoples R China.;[Zhang, Jijuan; Zhang, Zhongfeng; Peng, Dongmei; Yang, Yang] Green Furniture Engn Technol Res Ctr, Natl Forestry & Grassland Adm, Changsha 410004, Peoples R China.;[Zhang, Jijuan; Zhang, Zhongfeng; Peng, Dongmei; Yang, Yang] Green Home Engn Technol Res Ctr, Changsha 410004, Peoples R China.;[Zhang, Zhongfeng] Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410000, Peoples R China.;[Zhang, Zhongfeng] Green Furniture Engn Technol Res Ctr, Natl Forestry & Grassland Adm, Changsha 410004, Peoples R China.
通讯机构：
[Zhang, ZF ] ;Cent South Univ Forestry & Technol, Coll Furniture & Art Design, Changsha 410000, Peoples R China.;Green Furniture Engn Technol Res Ctr, Natl Forestry & Grassland Adm, Changsha 410004, Peoples R China.;Green Home Engn Technol Res Ctr, Changsha 410004, Peoples R China.
关键词：
charge transfer;formaldehyde degradation;graphite-like C3N4/C60 composite;photocatalysis;robust built-in electric field
摘要：
The photocatalytic degradation of formaldehyde by graphite-like C(3)N(4) is one of the most attractive and environmentally friendly strategies to address the significant threat to human health posed by indoor air pollutants. Despite its potential, this degradation process still faces issues with suboptimal efficiency, which may be attributed to the rapid recombination of photogenerated excitons and the broad band gap. As a proof of concept, a series of graphite-like C(3)N(4)@C(60) composites combining graphite-like C(3)N(4) and C(60) was developed via an in situ generation strategy. The obtained graphite-like C(3)N(4)@C(60) composites exhibited a remarkable increase in the photocatalytic degradation efficiency of formaldehyde, of up to 99%, under visible light irradiation, outperforming pure graphite-like C(3)N(4) and C(60). This may be due to the composites' enhanced built-in electric field. Additionally, the proposed composites maintained a formaldehyde removal efficiency of 84% even after six cycles, highlighting their potential for indoor air purification and paving the way for the development of efficient photocatalysts.
