European Journal of Wood and Wood Products
·
2014
·Vol. 73
·期 1
·97-102
·
IF 1.105
Pan Chengyuan,Ruan Guanhua,Chen Haihong,Zhang Dayu
Wood preservation is one of the most effective methods to prevent damage caused by termites. Sodium fluoride (NaF) is a well-known fungicide for preventing decay in timber due to its excellent diffusion in wood. In this study, the toxicity of NaF to the termites Reticulitermes flaviceps and its potential leachability as wood preservative were assessed. While termites were in contact with NaF-treated filter paper in a Petri dish for nine days, termites were found completely dead while the papers were treated by NaF at concentration of 0.5 % (wt/wt) or above. Wood blocks of Pinus massoniana were treated with five different concentrations of NaF (0.1, 0.25, 0.5, 1 and 2 %) respectively, and then exposed to a non-soil-contact field leaching experiment. After 4 weeks, retention levels of NaF in the wood blocks dropped from 0.075–0.834 % to 0.057–0.284 %. A choice test, in which NaF-treated and untreated wood blocks were exposed to the termites R. flaviceps was conducted. The results showed NaF, even at retention of 0.057 % (wt/wt), could significantly inhibit termite feeding in the treated blocks. The results suggest that NaF is a suitable wood preservative with anti-feedant activity against termites.
研究领域:
昆虫学
·
林学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2025
·Vol. 17
·期 3
·1146
·
IF 3.3
Ruyun Bai,Yong Huang,Sining Li,Changzhi Su,Huan Li,Qiushuang Cui,Wen Liu,Hanyu Wei,Yi Si
Xinjiang is one of China’s most significant energy bases, and the generated fly ash (FA) contains a high concentration of metallic elements that can be used as a valuable resource. In this study, we looked into a roasting-acid leaching process technique for efficiently extracting gallium metal (Ga) from FA, employing sodium fluoride (NaF) as the roasting auxiliary and citric acid inzter (C6H8O7) acid leaching. After high-temperature activation by NaF, the glassy phase of FA was converted into silica aluminate with excellent acid solubility, and Ga was extracted from FA via acid leaching. The effects of optimal roasting and acid leaching process conditions on the Ga leaching rate were investigated. The results showed that it exhibited 83.71% Ga extraction under the conditions of a roasting temperature of 850 °C, FA-NaF coordination ratio of 1:0.5, roasting time of 10 min, C6H8O7solution concentration of 1.75 mol/L, ratio (S/L) of 1:15, acid leaching temperature of 100 °C, and acid leaching time of 1 h. The results also indicated that it was possible to obtain a higher extraction efficiency for the Ga extracts under the conditions of roasting temperature of 850 °C and FA-NaF coordination ratio of 1:0.5.
研究领域:
环境科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Rui Qu,Huijie Hou,Keke Xiao,Bingchuan Liu,Sha Liang,Jingping Hu,Shijie Bian,Jiakuan Yang
The evaluation of ecological risks of contaminant mixtures to organisms is very challenging due to the non-linear response of organisms to each component, especially under the co-existence of both stimulators and inhibitors. Whether the stimulatory effect can reduce or even offset the inhibitory effect would be critical to the risk assessment and the treatment measures of mixed pollutants. Here, the combined toxicity of sodium fluoride (NaF), a stimulator with stimulation rate >100%, and six compounds that cannot induce hormesis (four ionic liquids (ILs) and two pesticides) were studied. The time-dependent toxicity of each toxicant on Vibrio qinghaiensis sp.-Q67 was investigated at 0.25, 2, 4, 6, 8, 10 and 12 h. Results showed that four ILs and two pesticides failed to induce hormesis, while NaF induced hormesis from 2 to 6 h and induced stimulation only after 6 h and reached its maximum (650%) at 12 h. All mixture rays with NaF induced hormesis at different times. In the four NaF-IL mixture systems, the absolute value of maximum stimulation demonstrated an upwards and then a downwards trend with the increasing of mixture ratio of IL. In two NaF-pesticide systems, the maximum stimulation effect declined with the increasing of the mixture ratio of pesticide. The toxicities of the mixture were successfully predicted by the improved inverse distance weighted interpolation, which are not able to be predicted by the commonly used concentration addition or independent action models. This paper shed lights on evaluating the hormesis of mixtures and the ecological risk of fluoride.
研究领域:
生态毒理学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 17
·3871
·
IF 3.057
Bingbing Wan,Wenfang Li,Wanting Sun,Fangfang Liu,Bin Chen,Shiyao Xu,Weiping Chen,Aihua Yi
Secondary aluminum dross (SAD) is regarded as a solid waste of aluminum recycling process that creates serious environmental and health concerns. However, SAD can also be used as a good source of aluminum, so that utilizing the SAD for the production of valuable products is a promising approach of recycling such waste. In the present work, a novel eco-friendly three-step process was proposed for the synthesis of cryolite (Na3AlF6) from the SAD, and it consisted of (1) water-washing pretreatment of SAD, (2) extraction of Al component via pyro-hydrometallurgy, including low-temperature alkaline smelting, water leaching and purification of leachate in sequence, (3) precipitation of cryolite from the purified NaAlO2solution using the carbonation method. By analysis of the parameter optimization for each procedure, it was found that the maximum hydrolysis efficiency of aluminum nitride (AlN) in the SAD was around 68.3% accompanied with an extraction efficiency of Al reaching 91.5%. On this basis, the cryolite of high quality was synthesized under the following optimal carbonation conditions: reaction temperature of 75 °C, NaAlO2concentration of 0.11 mol/L, F/(6Al) molar ratio of 1.10, and 99.99% CO2gas pressure, and flow rate of 0.2 MPa and 0.5 L/min respectively. The formation of Na3AlF6phase can be detected by XRD. The morphological feature observed by SEM revealed that the as-synthesized cryolite had a polyhedral shape (~1 μm size) with obvious agglomeration. The chemical composition and ignition loss of the as-synthesized cryolite complied well with the requirements of the Chinese national standard (GB/T 4291-2017).
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yichong Li,Han Zhang,Huizhong Zhao,Jun Yu,Jiuhong Ma,Li Feng,Yanli Liu
Management and utilization of solid waste are necessary for sustainable development in the metallurgical industry. This study focuses on the use of ferrotitanium slag (FTS) as a low-cost source of hibonite in the refractory lining of an aluminum-melting furnace. FTS enhances the resistance of castable samples to cryolite melt penetration but reduces their bulk density and cold mechanical strength . To explain this enhancement mechanism, we present a model in which the Al 2 O 3 and SiO 2 components in the castable samples react with the cryolite melt to form a high-viscosity barrier layer against the molten cryolite. Moreover, the well-developed calcium hexaaluminate crystals in FTS, which show excellent resistance against Na + and F − , prevent the penetration of cryolite melt through the FTS aggregate area, and reduce the penetration speed. By promoting high-efficiency resource utilization, this study contributes to the development of a circular economy in the metallurgical industry.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2019
·
IF 4.12
Baozhong Zhu,Fan Li,Yunlan Sun,Yuxin Wu,Wei Shi,Weikang Han,Qichang Wang,Qi Wang
Micron-sized aluminum powder exhibits difficulties in ignition and burnout in steam. To overcome these problems, we added various sodium fluoride contents to micron-sized aluminum powder in steam at 800, 900, and 1000 °C to assess their effects on ignition and combustion performances. The ignition delay times, ignition temperatures , and combustion characteristics of all samples were measured primarily using two high-temperature tube resistance electric furnace systems. The experiments showed that adding sodium fluoride to micron-sized aluminum powder decreases its ignition delay time and temperature. Moreover, the ignition delay time and temperature of aluminum powder with addition of sodium fluoride decreases considerably when the temperature increases. For this study, the components and morphology of solid combustion products were obtained using X-ray diffraction and scanning electron microscopy. The combustion efficiency was measured volumetrically using a specially designed apparatus. The obtained combustion efficiency was found to increase with the amount of sodium fluoride added and increase in the temperature. The relationship among the parameters related to combustion characteristics and product characterization was examined in detail to reveal the combustion mechanism.
研究领域:
能源科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
S. Yang,Y. Cheng,T. E,Y. Wang,L. Liu,Y. Li,D. Wang,J. Qian
The inert substrate surface of MoS 2 leads to unsatisfactory adsorption performance. Herein, an inert substrate surface activation strategy is proposed, and the resulted MoS 2 /montmorillonite (MMT) prepared via the hydrothermal method is immersed with NaF (F–Mt). The intercalation of Na + contributes to inducing the transformation of MoS 2 from 2H phase to 1 T phase, thereby providing a large number of S vacancies and exposing available Mo 4+ . Meanwhile, the surface of MMT is activated due to the fact that partially [Si 4 O 10 ] 4- are etched by F - , which facilitates forming Si–O–Mo bonds to promote the charge transfer. The improved charge transfer rate can make S 2- in MoS 2 accumulate more negative charges, greatly enhancing the adsorption capacity to Pb 2+ . Moreover, the natural negative potential on the surface of MMT solves the problem of easy stacking for nanosheets , improving the availability of active sites on the edge, which are also benefit from the etching effect on MoS 2 nanosheets with NaF. The maximum adsorption capacity achieves 97.09 mg/g. Additionally, density functional theory (DFT) calculations confirm the resulted S vacancies in MoS 2 are in favor of removing Pb 2+ , which is also contributed by the electrostatic and chemical adsorption with MMT. Therefore, it suggests that F–Mt is an excellent adsorbent for Pb 2+ .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ARCHIVES OF ORAL BIOLOGY
·
2015
·
IF 1.735
Yu-Ting Xu,Qiong Wu,Ya-Ming Chen,Roger J. Smales,Shu-Ya Shi,Meng-Ting Wang
Objective The objective of this study was to investigate the antibacterial effects on a cariogenic biofilm of a bioactive glass (BAG) combined with either sodium fluoride (NaF) or triclosan (TCS). Design According to minimal bactericidal concentrations, 37.5 mg/ml of BAG, 4.69 mg/ml of NaF, and 15.53 μg/ml of TCS solutions were prepared. When used alone, the three antimicrobial solutions were increased to double-dosage strength (2MBC). The study contained the following experimental groups: group 1, BAG (2MBC); group 2, NaF (2MBC); group 3, TCS (2MBC); group 4, BAG + NaF; group 5, BAG + TCS; group 6, control (saline). Streptococcus mutans biofilm was cultured with 0.1% sucrose anaerobically on 66 sterilized coverslips (1 × 1 cm 2 ) for 24 h uninterrupted. After 10 min of exposure to the experimental groups, the microbial kinetics, morphology, and viability of the S. mutans biofilms were assessed by evaluation of colony-forming units (CFUs), scanning electron microscopy (SEM), and confocal laser scanning microscopy (CLSM). Results BAG (2MBC) used alone showed significantly stronger antibacterial effects than the other two antimicrobials used alone. The combination groups also displayed the same or greater biofilm inactivation effects as BAG (2MBC) in the plate count test. SEM showed smaller stacks (towers) and fewer surrounding bacteria in groups BAG (2MBC), BAG + NaF, and BAG + TCS. Confocal microscopy also determined higher live/dead ratios in groups NaF (2MBC), TCS (2MBC), and control than in groups BAG (2MBC), BAG + NaF, and BAG + TCS. Conclusions The combinations of BAG with either NaF or TCS enhanced the inactivation effects of BAG (2MBC) on S. mutans biofilm, and these findings should be further investigated clinically for the control of dental biofilms.
研究领域:
口腔医学
·
微生物学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yueyang Tan,Yayun Pu,Zhongyan Zhang,Yabin Jiang,Lei Zeng,Chao Cai,Lu Jia,Weiman Zhuang,Zongzhao Sun,Limin Huang
In the typical ionothermal synthesis of crystalline carbon nitride (CCN), alkali metal halides are usually used in large amounts. Here, we report a new method for synthesizing poly (heptazine imide) (PHI) using only a trace amount of NaF, which is 20 times less than the amount of NaCl typically required to achieve the PHI structure. Different from the prevailing view that salts function primarily as templates and chelating agents during polymerization, our research revealed the unique role that NaF plays in the polymerization of PHI. We propose a new formation mechanism, termed the “pinning-docking mechanism,” in which fluoride (F) atoms and bidentate nitrogen atoms (N) coordinated to sodium (Na) atoms build a strong triangle configuration that synergistically promotes the formation of PHI. Calculations indicate that the highly electronegative F atom generates an effective electron flow within the N-metal-F complex, causing local electron reorganization and accordingly activating the N sites for H 2 evolution. The synergistic roles of Na and F atoms in NaF for synthesizing PHI cannot be replicated with either NaCl or NH 4 F salts under low dosage conditions. The synthesized PHI structure exhibits an exceptional hydrogen evolution rate of 10.2 mmol h −1 g cat −1 , exceeding that of amorphous TCN (550) by 217 times. This work provides an economical method for CCN synthesis and explores the underlying role of NaF salt during polymerization, which can be valuable for designing highly crystalline carbon nitride materials.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science of Advanced Materials
·
2017
·Vol. 9
·期 12
·2187-2195
·
IF 1.671
Zeng Lu,He Mou,Yang Ligang,Wang Shuping
Herein, we report the hydrothermal synthesis and detailed characterization of fluorine-doped calcium silicate hydrate (F-CSH). The synthesized material were characterized by several techniques, i.e., X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform
infrared (FTIR) spectroscopy. The detailed studied revealed that the sodium fluoride was beneficial to promote the growth of gyrolite but prevent the formation of plate-like 14 Å tobermorite. The produced CaF2 affects the appearance and shape of the material. The XRD results
confirmed that the constitution and structure of CSH are different from those of F-CSH which can generate the phase of gyrolite. Finally, the modification mechanism of F-CSH was primarily analyzed and discussed in this paper. This research is of great significance in the preparation and characterization
of various fluorine-doped inorganic compounds.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF DENTISTRY
·
2022
·
IF 4.991
Yaoxin Wang,Ning Ding,Zhenyu Zong,Zutai Zhang
Objectives This study aimed to investigate the effect of etch-mineralizing solution as a dentin treatment agent on dentin bonding. Methods This study designed four kinds of etch-mineralizing solutions (EMs) by adding sodium fluoride in 35% phosphoric acid aqueous solution with four different concentrations (5, 10, 20, and 30 mg/ml), and named F1, F2, F3 and F4, respectively. 35% phosphoric acid gel treatment was the control group. SEM, EDS, FTIR and microhardness tests were performed on the treated dentin. Shear bond strength was measured before and after aging. Nanoleakage was also evaluated. Fracture mode was researched after SBS testing. The antibacterial properties of treated dentin were also investigated through live/dead staining of biofilms. Results The smear layer was removed and mineralization substances were observed on the dentin surface and tubule, and no obvious collagen fibers were observed compared with the control group. FTIR spectrums showed that the ratios of phosphate/collagen on EMs treated dentin surfaces were significantly increased ( P < 0.05). F2 group had the highest bonding strength (32.14 ± 7.33 MPa) and microhardness (66.08 ± 10.58), while the control group had the lowest bonding strength (21.81 ± 4.03 MPa) and microhardness (42.34 ± 7.08) ( p < 0.05), and excellent bonding strength caused more cohesive fracture. Experimental groups showed less nanoleakage than group C ( P < 0.05). Moreover, experimental groups had better antiaging performance and antibacterial properties than the control group ( p < 0.05). Conclusion EMs treatment not only improved dentin bonding and antibacterial ability, but also remineralized dentin with autologous mineral elements. Clinical significance The treatment provides a novel therapeutic strategy for obtaining ideal dentin bonding strength and prolonging the longevity of the restoration.
研究领域:
牙科材料学
·
口腔医学
·
生物材料学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 326
·期 1
·575-581
·
IF 1.137
Cai Fei,Yan Heng,Fan Wenbin,Li Shihong,Xu Jianfeng,Wang Zheng,Tang Xiaobin
A mild HPLC method for the quality control of [ 18 F]sodium fluoride solution for injection was developed. The method used anion exchange column for separation, UV and online radio-detectors for fluoride content and fluorine-18 determination. A mixture of 100 mM sodium acetate and 25 mM sodium chloride was chosen as mobile phase. The method was validated for system suitability, specificity, fluoride concentration and radiochemical purity determination with good linearity, accuracy and precision. The good robustness of the system was also verified, enabling routine analysis of fluoride content and radiochemical purity of the [ 18 F]sodium fluoride product.
研究领域:
药学
·
核医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）