NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 37
·期 4
·677-685
·
IF 1.595
Huiming Fan,Jingkun Yang,Zhuoyao Ma,Hangtian Gao,Hongyan Mou,Jianan Liu
In order to solve the environmental problems caused by landfilling and incineration of Fenton sludge, realize the recycling of papermaking solid waste. In this paper, we explored the formation of a layer of calcium carbonate coating on the surface of Fenton sludge by crystallization coating in the Fenton sludge-[Ca(OH) 2 /H 2 O]-CO 2 three-phase reaction system to improve the brightness of Fenton sludge and apply it to the filling of paper. The effects of particle size, temperature, stirring rate and calcium hydroxide addition on crystallization coating effect were studied. The advantages and disadvantages of the coating effect are mainly judged by the brightness and dustiness of the powder material. The research results show that when the particle size is 38–48 μm, the temperature is 25 °C, the stirring speed is 600 r/min, and the ratio of calcium hydroxide to Fenton sludge is 2:1, the brightness of the composite can be increased from 3.56 % ISO to 64.24 % ISO.
研究领域:
环境科学
·
材料科学
·
造纸工程
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Jinpeng Lv,Xiangyu Wen
Passive thermal control coatings (TCC's) have been widely used to tune the thermal equilibrium of spacecraft surfaces since 1970s. Development of new TCC's with improved thermo-physical properties and radiation hardness are essential to the space assets that fly in harsh environments. Herein, we fabricated calcium orthophosphate based inorganic white paint, which possess relative low solar absorptance (α s ) of 0.095 and thermal emittance (ε H ) of 0.88. Noticeably, the Ca 3 (PO 4 ) 2 coating shows excellent space radiation tolerance and thermal control capacity. After performing 90 keV proton irradiation at a fluence of 4×10 15 cm -2 , the α s of ZnO coating increases from 0.160 to 0.213 while the Ca 3 (PO 4 ) 2 coating rises from 0.095 to 0112, which only degrades one third (0.017) of the ZnO coating (0.053). Furthermore, after performing simulated solar irradiation test, the surface temperature of Ca 3 (PO 4 ) 2 paint is 14.4 °C lower than that of ZnO coating, evidencing its prominent thermal-optical performance. Besides, we also found that Ga 2 O 3 based liquid-glass white paint is a good candidate for thermal equilibrium of spacecraft.
研究领域:
材料科学
·
航天工程
✓ 已验证
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 12
·1534
·
IF 2.881
Yaping Wen,Huoliang Qing,Hui Shu,Qiang Liu
The purpose of this work was to use different surfactants to deposit different crystalline calcium carbonate films on the surface of sandstone through a simple double displacement reaction. This was done to test the protective effects of calcium carbonate coatings based on water absorption, moisture permeability and weather resistance. Experimental results showed that the air permeability of the stone treated with vaterite calcium carbonate was reduced, but that this did not affect water vapor’s access into and out of the stone. Compared with untreated stone, the water absorption rate was reduced 0.5 times, and the weather resistance increased by 4 times due to small crystal grains, high solubility, and deep penetration hindering the erosion of water and soluble salts. These findings are expected to provide useful suggestions for the protection of stone cultural heritage.
研究领域:
材料科学
·
文物保护学
·
无机化学
·
表面化学
·
建筑材料耐久性
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiuwen Qian,Xiaoyu Ji,Chunni Yan,Juan Huang,Yufeng Wu,Xinyue Wang
Modified basalt fiber (MBF) has been employed as biological carrier to strengthen wastewater treatment. However, few studies focused on the superiority of different MBFs and their microbial mechanisms. In this study, after surface coating and chemical grafting, four MBFs and BF were applied as carriers in contact oxidation reactors. Surface roughness and area of MBFs increased in relation to original BF. Compared to BF group, MBFs could improve nutrients removal performance and stability, probably owing to impacts on microbial community structure. Specifically, calcium coating (Ca-MBF) contributed to the highest ammonium removal in average (72.25%), due to the relative more stimulation on Nitrosomonas and Nitrospira . Improvement on nitrification in Ca-MBF group resulted in the most significant increase of total nitrogen removal by 9.72% (p < 0.05) compared to BF. In contrast, chemical grafting was more inclined to enhance denitrification, particularly in PEI-MBF group, which was 34.62% higher (p < 0.05) than BF. The most enrichment on denitrification bacteria was also observed in PEI-MBF group (51.29%), including Zoogloea , Flavobacterium , and Acinetobacter , causing promotion on microbial denitrification. Besides, chemical grafting brought about more phosphate accumulating organisms like Thauera , Acinetobacter , and Pseudomonas , increasing total phosphorus removal compared to BF by 4.27–18.53%. Nevertheless, the highest phosphorus removal was discovered with Ca modification, inconsistent to the lowest microbial abundance, suggesting that more physical absorption sites by Ca modification was the major reason for enhancement on phosphorus removal. This work provided insights into application potential of different modified BFs for wastewater treatment.
研究领域:
环境工程
·
微生物学
·
废水处理
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）