JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhenjie Ma,Xiangshang Chen,Gaoyang Zhou,Yue Jia,Huayan Chen,Xiaolong Lu
A stability-enhanced extraction gel membrane (EGM) with a thin functional layer of carrier for metal ion recovery was prepared and improved by cross-linking technology. Hydroxyl-terminated polybutadiene (HTPB) was used as the coupling agent to form a cross-linked network skeleton. Polymethylhydrosiloxane (PMHS) and HTPB were hydrosilylated to form a compact cross-linked structure. In addition, the D2EHPA (carrier) was fixed on polymer cross-linked structure. The prepared stability-enhanced EGM was characterized by SEM, EDS, ATR-IR, XPS . The influence of preparation parameters was studied and compared systematically. The optimum preparation conditions obtained from the data indicate that the total polymer concentration is 8 wt%, the mass ratio of HTPB/PMHS is 1:2, and the mass ratio of TEOS/VTES is 1:1. After 72 h of stability experiments, the mass transfer flux decreased from 2065.46 mg m −2 h −1 –1718.82 mg m −2 h −1 , the overall flux attenuation rate is only 16.8 %, which is 50.8 % lower than that of EGM without surface enhancing layer. In comparison, the flux attenuation rate of the traditional supported liquid membrane (SLM) even reached 100 % after 66 h. Therefore, the stability-enhanced EGM prepared in this study presents obviously higher operating stability compared with the EGMs operated at same conditions. The results suggest a potential approach for metal ions removal from water with high efficiency and stability.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongdong Liu,Xiuming Liu,Kuanjun Fang,Jixian Gong,Shuai Zhang,Xiran Qiao,Jinkun Wang,Tianning Wang,Enzheng Xing
The use of auxiliaries for textile dyeing and printing and the release of residual dyeing liquor cause enormous harm to the environment, while the single function of dyed fabrics hinders their development in more advanced fields. In this work, zeolitic imidazolate framework-8 (ZIF-8) nanocrystals were grown in situ on carboxymethyl cotton fabric to absorb acid dyes without auxiliaries. To further improve its durability and color fastness, polymethylhydrosiloxane (PMHS) hydrophobic coating was used to protect its surface. The as-prepared cotton fabrics exhibited a K/S value of 21.78, a hydrophobic angle of 160.2° and a UPF value close to 50+. They showed high stability under various environmental conditions, which provided a simple and enviromental way to prepare multifunctional dyed textiles. The high hydrophobic angle of the fabric offered excellent adsorption of oil agent in the oil–water mixture, and the oil–water separation efficiency can still reach more than 95% even after 20 cycles, indicating that the fabric also had promising applications in the treatment of oiled wastewater.
研究领域:
材料科学
·
环境科学
·
纺织工程
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DOI
高影响因子
Coatings
·
2018
·Vol. 9
·期 1
·15
·
IF 2.35
Jingbing Chen,Yunyun Ma,Huiping Lin,Qingzhu Zheng,Xinxiang Zhang,Wenbin Yang,Ran Li
Poor mildew resistance has limited the application of bamboo materials. In this work, ZnO/PMHS coatings were fabricated on bamboo timber surfaces by hydrothermal synthesis method and hydrophobic modification with poly(methylhydrogen)siloxane (PMHS). The surface chemical characteristics and microstructure of the bamboo before and after modification were investigated using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and water contact angle (WCA). The morphology results indicated that ZnO on the surface of bamboo forms flower-like aggregations. The WCA of ZnO/bamboo increased from 65° to 142° after PMHS hydrophobic modification, indicating that the hydrophobicity of bamboo was significantly improved. The original bamboo had poor anti-mildew properties when exposed toTrichoderma viride,Aspergillus niger, andPenicillium citrinum.After depositing ZnO onto the surface of the bamboo, the anti-mildew properties were significantly improved. Furthermore, it was found that after PMHS hydrophobic modification, ZnO/bamboo had excellent anti-mildew properties when exposed to the three mold hyphae, which indicated that PMHS hydrophobic modification had a synergistic effect on the anti-mildew properties of bamboo with a ZnO coating.Keywords:bamboo;anti-mildew;ZnO;poly(methylhydrogen)siloxane;synergistic effect
研究领域:
材料科学
·
生物学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 75
·期 1
·82-89
·
IF 1.532
Xiao Zuo-Yi,Huang Shu-Xian,Zhai Shang-Ru,Zhai Bin,Zhang Feng,An Qing-Da
Abstract A one-pot method was introduced to fabricate Ag–SiO 2 hollow composite spheres with developed porosity by employing monodisperse carboxylic-capped polystyrene (PS–COOH) spheres as a hard template. During the synthetic process, Ag + ions were immediately anchored on the surface of the PS–COOH spheres via electrostatic interaction and readily reduced by employing polymethylhydrosiloxane (PMHS) as a reducing agent. At the same time, silica oligomers derived from the hydrolysis of PMHS and TEOS were slowly deposited on the PS–COOH spheres to form solid silica shells. Subsequent decomposition of the PS–COOH spheres in air induced the formation of Ag–SiO 2 hollow spheres. The as-prepared products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and N 2 absorption–desorption study. The results show that the well-designed composite spheres featured thin and spherical silica shell (~10 nm), large surface area (>240 m 2 g −1 ) and mesopore (6.0–9.0 nm). In addition, the Ag–SiO 2 hollow composite spheres exhibited high catalytic performance toward the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Graphical Abstract A one-pot method was reported to prepare Ag–SiO 2 hollow spheres with well-developed porosity, which exhibited high catalytic performance and durable activity for the reaction of 4-NP to 4-AP.
研究领域:
材料科学
·
纳米技术
·
化学工程
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DOI
高影响因子
FIRE TECHNOLOGY
·
2025
·
IF 2.4
Ji Jingwei,Li Wenju,Zhang Hongxiang,Zheng Yuechuan,Zhang Tengpu,Du Jinghui,Zhang Hong,Shi Bangkai
At present, research on dry powder for magnesium fire extinguishing is mostly focused on extinguishing surface fires, with limited research on internal smoldering. Moreover, fire extinguishing performance tests of dry powder are primarily conducted on horizontal surfaces, while inclined and vertical combustion poses greater hazards and extinguishing challenges. To address this issue, a new dry powder extinguishing agent (NaCl/PMHS@LMG) with a dual phase-change temperature range was prepared in this paper to extinguish surface open flames and internal smoldering generated by magnesium fires on non-horizontal surfaces. The extinguishing agent was made using sodium chloride (NaCl) and polymethylhydrosiloxane (PMHS)-modified low melting point glass powder (LMG). The results of material testing showed that the NaCl/PMHS@LMG exhibited a dual phase transition, featuring a lower initial phase transition temperature, greater thermal stability, and enhanced heat absorption. At the same time, the modification of PMHS converted LMG from hydrophilic to hydrophobic, enhancing the dry powder’s overall moisture resistance. The results of magnesium fire extinguishing experiments show that NaCl/PMHS@LMG can effectively extinguish magnesium fires in both stacked and vertical forms. Compared with NaCl, the average extinguishing time and consumption of NaCl/PMHS@LMG in stacked fires were reduced by 49% and 52.7%, respectively, and the temperature reduction rate of stacked surfaces during extinguishing was approximately 4 times faster than with NaCl. Additionally, NaCl/PMHS@LMG formed a three-layer air-isolated cover on the stack surface after extinguishing, with an “auto-filling” function that effectively extinguished internal smoldering in magnesium chip stacks. Subsequently, the extinguishing mechanism of the dry powder was further explored.
研究领域:
材料科学
·
消防工程
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DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2017
·
IF 4.265
Ran Li,Pengkun Hou,Ning Xie,Zhengmao Ye,Xin Cheng,Surendra P. Shah
A silica-based hybrid nanocomposite , SiO 2 /polymethylhydrosiloxane (SiO 2 /PMHS), is synthesized by a sol-gel process and used for surface treatment of hardened cement-based materials. The advantages of both normal organic and inorganic silica-based treatment agents are explored. Results revealed a covalent chemical bonding of SiO 2 and PMHS and the SiO 2 /PMHS showed hydrophobicity and pozzolanic reactivity when used for surface treatment. Greater reductions of the water absorption rate and gas permeability coefficient of cement-based materials were achieved by the hybrid nanocomposite compared to its individual components, showing synergistic effects of hydrophobicity and pore refinement characteristics as proved by the measurements of the contact angle, the mineralogy, the morphology and the porosity. The results showed promising advantages of using silica-based hybrid nanocomposite for surface treatment to achieve a higher surface quality. Moreover, it can be suggested that more functionalities of the cement-based materials can be tailored through the design and use of the silica-based hybrid materials .
研究领域:
材料科学
·
土木工程
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Zhidong Ma,Min Sun,Anhang Li,Guiyu Zhu,Yue Zhang
A novel environment-friendly composite coating (P/P'-Ch-P/P') was prepared by layer-by-layer assembly of polyvinyl butyral (PVB), polymethylhydrosiloxane (PMHS) and chitosan (Ch) on AA 2024 substrate to improve the corrosion resistance of AA 2024 sample. The properties of the coatings were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and laser confocal microscope. The results showed that the addition of PMHS increased the hydrophobicity of composite coating；as the intermediate layer, Ch also crosslinked other components while forming the film. At the same time, the corrosion resistance of the coating in 3.5 wt.% NaCl solution was characterized by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. Compared with the bare aluminum substrates, the impedance modulus of the composite coating was increased by 3 orders of magnitude; the corrosion current density (Icorr) of the composite coating was reduced by 5 orders of magnitude. The results of long-term immersion test showed that the composite coating still had good anticorrosion ability after 60 days. This study provides a simple and environment-friendly method for corrosion protection of aluminum alloy in marine environment.
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高影响因子
Journal of Chemistry
·
2020
·
IF 1.79
Zhaozhuo Yu,Weibo Wu,Hu Li,Song Yang
Hydrogenation of bio-based furfural (FUR) to furfuryl alcohol (FFA) is tremendously expanding the application of biomass in many industries such as resins, biofuels, and pharmaceuticals. However, mass manufacture of FFA from FUR is restrained by strict requirements of reaction conditions and expensive catalysts. In this work, an economical and benign catalytic system, containing an easily prepared and reusable catalyst 5 wt.% KF/ZrO2 and a low-cost hydrogen source polymethylhydrosiloxane (PMHS), was developed to be efficient for the hydrogenation of FUR to high-value FFA under mild conditions. The catalyst reactivity was found to be remarkably influenced by the support acid-base properties and KF loading doge. In the presence of 5 wt.% KF/ZrO2, a high FFA yield of 97% and FUR conversion of 99% could be obtained at 25°C in just 0.5 h, which was superior to those attained with other tested catalysts. The KF/ZrO2 catalyst could be recycled at least five times, with the FFA yield slightly decreasing from 97% to 71%. The spare decrease in FFA yield is possibly attributed to the catalyst pore blocking, as clarified by SEM, BET, XPS, and ICP-MS measurements of the fresh and reused catalysts.
研究领域:
化学工程
·
可再生资源利用
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2014
·Vol. 72
·期 2
·385-393
·
IF 1.547
Guo Ping,Zhai Shang-Ru,Xiao Zuo-Yi,Zhang Feng,An Qing-Da,Song Xiao-Wei
Fabrication of s uerhydrophobic materials towards oil/water separation and oil absorption has been receiving great attention nowadays, due to the significant increase of industrial oily wastewater and frequent accident of oil spill. In most previous studies, the usage of expensive precursors restricted the wide applications of prepared superhydrophobic materials. In this work, superhydrophobic filter paper, fabric and polyester sponges were fabricated by dip-coating the mixed solution of polystyrene and xerogels, which were prepared with tetraethoxysilane and polymethylhydrosiloxane, based on previous work. The as-fabricated fabric can effectively separate oil and water mixtures and possesses excellent reusability; more significantly, the materials maintained its good hydrophobic and excellent oil/water separation capacity even after ten cycles. Interestingly enough, the stability was provided, as a result, the fabric still exhibited superhydrophobic after 100 abrasion times and showed high repellency towards many liquids with different pH values. Additionally, the coated polyester sponges can quickly absorb various oil and organic liquid, which will offer a practical application for the treatment of seawater or oily wastewater. By contrast, this experiment process is simple and avoided using costly fluoro-chemicals or complicated fabrication process.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 17
·3574
·
IF 5
Guang Yang,Zhonghua Chen,Changwei Lv,Lei Deng,Xiaofeng Luo,Yi Li,Songtao He,Qibin Liu
Hemihydrate phosphogypsum, an industrial solid waste product of phosphoric acid production, is abundant and inexpensive. If the problem of poor water resistance is solved, this material could be substituted for cement and other traditional energy-consuming cementitious materials in the construction industry. This approach would confer important economic and environmental benefits while promoting the resource utilization of phosphogypsum (PG). In this study, hydrophobic and self-cleaning coatings of H-PDMS/PMHS/OTS hybrid nanosilica were prepared on a post-hydroxylated PG surface using sol–gel and impregnation methods. The water contact angle, Fourier-transform infrared spectroscopy, Three-dimensional surface morphology and roughness analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, surface abrasion tests, and tape adhesion tests were used to evaluate the hydrophobicity of the coatings. The results demonstrated that the in situ reaction produced a hydrophobic siloxane/nanosilica hybrid network that bonded to the PG surface via hydrogen bonding, making the otherwise completely hydrophilic PG hydrophobic (PGH-3, contact angle (CA) = 144.1°). The PGH-3 sample exhibited excellent chemical stability, maintaining a contact angle greater than 135° under strongly acidic or alkaline conditions. The contact angle remained at 123.7° after 50 tape-bonding tests. After 100 wear cycles, the contact angle remained at 121.9°. This study presents an environmentally friendly method and a straightforward application procedure to impart hydrophobicity to solid waste PG. Its potential is thus demonstrated in the field of PG-based construction materials and the comprehensive utilization of solid waste.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Ping Guo,Shangru Zhai,Zuoyi Xiao,Qingda An
Facing the issues of significant increase of industrial oily wastewater and frequent accident of oil spills, the developing of efficient and affordable absorbents for improving oil pollution is of practical significance. Herein, several superhydrophobic and superoleophilic materials, utilizing filter paper, filter cloth and polyester sponge as substrates, through facile coating of hybrid SiO 2 colloid particles from controllable PMHS–TEOS sol system were presented. These methyl-modified particles not only provided hierarchical micro/nano-scale structure with distinct roughness, but also largely lowered the surface energy of the coated substances, leading to excellent superhydrophobic and superoleophilic surfaces. The modified filter cloths could be applied for oil/water separation owing to the flexible and foldable property; sponges could efficiently absorb oil or organic solvents in situ on account of its low density and high porosity, and meanwhile the absorbed oil could be easily recollected by simple squeezing. It is worth mentioning that both modified filter cloths and sponges exhibited excellent selectivity , high efficiency, outstanding rapidity and remarkable recyclability. More importantly, after treatment of 100 abrasion cycles with metal scalpel and strongly acidic and basic water droplets, the whole WCA values of resultant filter cloths still maintained superhydrophobic character (>150°), illuminating the charming mechanical and chemical stability of sol–gel processed coating with hierarchical roughness and covalently bonded methyl groups . Combining controllable fabrication process and cheap raw precursors, this method enables scalable manufacturing of stable and superhydrophobic substances, which are promising in practical applications involved in oil/water separation and oil sorption .
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2026
·Vol. 11
·期 30
·45485-45493
·
IF 5.2
Ye Zhixuan,Chen Xingshu,Zhang Linxin,Wang Jun,Chen Hanxian,Zhang Xinxiang,Zhao Weiwei,Yuan Zhanhui
The abundant hydrophilic
hydroxyl groups and porous structure make
wood highly susceptible to moisture absorption from the environment,
leading to issues such as deformation and decay. This work aims to
in situ construct a multifunctional organosilicon/organic hybrid resin
coating on the wood surface derived from the click reaction of polymethylhydrosiloxane
(PMHS), using PMHS, divinylbenzene (DVB), and the Karstedt catalyst.
At room temperature, through the Si–H addition click reaction
between PMHS and DVB, a cross-linked and rigid hybrid resin coating
with a hardness of 94.00 HA is fabricated on the wood surface. Simultaneously,
a dehydrogenation click reaction takes place between the Si–H
groups of PMHS and the –OH groups on the wood surface, anchoring
the hybrid resin coating to the wood via covalent bonds. These endow
the hybrid resin coating with excellent mechanical stability. The
low surface energy of organosilicon resin in the hybrid coating affords
the modified wood with good waterproofness by decreasing the 24 h
water absorption rate from 78.6% to 13.9%. Most importantly, the coating
remains hydrophobic even after being immersed in an alkaline solution
(pH = 13) for 24 h. SEM images of the coating after alkaline corrosion
indicate that while the Si–O–Si skeleton of the organosilicon
component is partially dissolved due to its susceptibility to alkali,
the hydrophobic organic resin skeleton remains intact, imparting good
alkali resistance to the hybrid resin coating. In summary, the organosilicon/organic
hybrid coating constructed via the click reaction of PMHS on the wood
surface effectively addresses the issue of poor alkali resistance
commonly associated with traditional organosilicon coatings.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）