SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Yuan Gao,Zhenhuan Li,Bowen Cheng,Kunmei Su
In this study, Poly(p-phenylene sulfide) (PPS) microporous membrane was prepared via Thermally Induced Phase Separation (TIPS), and the superhydrophilic membrane was modified by nitric acid. After the interfacial reaction between PPS membrane and HNO 3 , a large number of hydrophilic groups, such as SO , SO 2 , C O, NH 2 and NO 2 groups, were introduced onto PPS membrane surface. When the treatment temperature was 50 °C, the characterized results indicated that the membrane became superhydrophilic with contact angle of 0° and pure-water flux of 154.95 L/m 2 h. And the membrane structure was not destroyed during the modification via HNO 3 . Furthermore, the performance of modified membrane on oil/water separation was studied and all of the separation efficiency were greater than 95% when the modified membrane was utilized to separate four different types of oil/water emulsions. In particular, the modified membrane was utilized to separate the chlorobenzene/water emulsion with the separation efficiency of 98.98%. Both carbonic ink solution and 1 wt% chlorobenzene/water emulsion were filtered with the treated membrane with acid/base solution (pH = 1, 7 and 14) to evaluate the modified membrane corrosion resistance of acid/base, and the characterized results indicated that modified membrane possessed the excellent acid/base corrosion resistance.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Shuying Shi,Kangkang Yuan,Chonghe Xu,Xiaotong Jin,Yongshuai Xie,Zenghao Wang,Xinqiang Wang,Luyi Zhu,Guanghui Zhang,Dong Xu
CaZrO 3 (CZO) precursor fibers were prepared by sol-gel method and electrospinning technique from solutions which contained aqueous precursors of calcium and zirconium ions and polyethylene oxide . The crystallization of CZO fibers was a concurrent process with the decomposition of organics. The evolution process was characterized by Fourier transform infrared (FT-IR) and Raman spectra, thermogravimetry and differential scanning calorimetry (TG/DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The heat-conducting property and high temperature stability of fibers were characterized by the measurements of thermal conductivity and heating permanent linear change, respectively. The fibers were treated in NaOH solution at 80 °C to characterize the alkali resistance. The results showed that CZO fibers had the lower thermal conductivity than the other reported forms of CZO materials, and they possessed excellent stability up to 1100 °C with thermal shrinkage less than 1.2% and excellent corrosion resistance to alkalis. Hence, CZO fiber could be used as a suitable corrosion resistant refractory material for high-temperature thermal insulation .
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
Applied Water Science
·
2021
·Vol. 11
·期 3
·1-14
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IF 3.874
Wen Gongpu,Chen Kun,Zhang Yanhong,Zhou Yue,Pan Jun,Wang Qian,Sun Siyuan,Wang Zhaohui
A novel strategy was proposed to fabricate alkali-resistant PVDF membrane via sodium lauryl sulfate (SDS) attached to the surface of membrane and immobilized by UV-curable polyester acrylate and tri(propylene glycol) diacrylate (TPGDA). The attached anionic surfactant, SDS, on the membrane surface can resist the alkali corrosion by NaOH, and the curing of the resin can immobilize the SDS on the membrane firmly. Due to the unique alkali resistance of SDS and resin formed, the UV-curable resin-modified PVDF membrane showed greatly enhanced alkali-resistant ability. Characterization of SEM and FTIR showed that polyester acrylate and TPGDA were cured successfully under the action of 1-hydroxycyclohexyl phenyl ketone (184) and ultraviolet light. Whiteness, differential scanning calorimeter and X-ray photoelectron spectrometer characterization showed that the modified PVDF membrane had a lower degree of dehydrofluorination than the pristine PVDF membrane after alkali treatment. Results of the detailed alkali-resistant analysis indicated that the F/C ratio of the UV-curable resin-modified PVDF membrane decreased by 2.6% after alkali treatment compared to pristine PVDF membrane decreased by 19.28%. The alkali-resistant performance was mainly attributed to the immobilized SDS. This study provided a facile and scalable method for designing alkali-resistant PVDF membrane, which shows a promising potential in the treatment of alkaline wastewater and alkaline-cleaning PVDF membrane.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Building Engineering
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2024
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IF 6.7
Cong Wei,Quan Zhou,Kai Deng,Yongquan Lin,Linge Wang,Yue Luo,Yuling Zhang,Heng Zhou
Basalt fiber is commonly regarded as an alkaline corrosion-resistant material, capable of being transformed into various products (such as basalt fiber roving, chopped yarn and composite reinforcement). However, the main composition of the basalt fiber network skeleton consists of Si ∼ O bonds, which can still react with ∼OH in the alkaline environment. Nevertheless, there are differing viewpoints on the alkaline corrosion of basalt fibers within literatures. Therefore, this study aims to select three representative types of basalt fibers and compare them with two alkali-resistant glass fibers and one regular glass fiber. The attenuation mechanism of basalt fibers were investigated through orthogonal experiments, practical application scenarios and microscopic characterization methods. Additionally, we employed the Weibull model to analyze failure probabilities after erosion on basalt fibers while also applying a machine learning artificial neural network (ANN) model for predicting their alkali resistance. The results indicated that the tensile strength of basalt fiber tended to decrease and the alkali resistance of basalt fiber between alkali-resistant glass fiber and regular glass fiber in four alkaline solutions. The Weibull model also confirms that erosion increases failure probability of basalt fiber and glass fiber. Moreover, Si ∼ O, which forms the network reacted with OH-, resulting in a reduction in surface Si and Al elements content. It became possible to predict the alkali resistance of basalt fiber accurately by establishing an ANN model. Our study provide a theoretical foundation for predicting the lifespan of basalt fibers under corrosive conditions while offering guidance for enhancing their alkali resistance.
研究领域:
材料科学
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化学工程
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机器学习
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产品关联
DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
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2022
·Vol. 37
·期 2
·311-319
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IF 1.595
Zhenzhen Chen,Yingping Qi,Yongfeng Shen,Hua Li
As the main carrier of art and cultural heritages, paper cultural relics are suffering from aging, oxidation, acidification, bacterial corrosion and other diseases with the passage of storage time. Therefore, it is of great significance to carry out the protection of paper cultural relics. In order to improve the bacteriostatic properties, mechanical strength and delay aging of paper, sodium carboxymethyl cellulose was modified by berberine and prepare berberylated carboxymethyl cellulose (BBR-DCMC), which is mixed with KH-791 modified nano-silica and hydroxypropyl distarch phosphate to prepare a multifunctional protective liquid integrating deacidification, reinforcement and antibacterial. The paper coated with the multifunctional protective liquid showed better antibacterial and mechanical properties, and the gloss and whiteness changed slightly. The aging test and the acid and alkali resistance test showed that the paper had certain aging resistance and acid and alkali corrosion resistance. It is an ideal protective agent for paper cultural relics and has broad application prospects in paper protection.
研究领域:
文物保护
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2024
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IF 5.8
Yinchao Jin,Hongyu Chen,Gongpu Wen,Jie Zhou,Zhaohui Wang,Feng Zhang,Zhaoliang Cui
The increased alkali resistance of PVDF membranes helps to extend membrane life and expand membrane applications in alkaline environments. In this paper, the amphiphilic copolymer hexafluorobutyl methacrylate (HFBMA) was grafted onto PVDF membranes via atom transfer radical polymerization (ATRP), and the corrosion resistance of PVDF-g-HFBMA in alkaline solutions was investigated. PVDF-g-HFBMA was prepared by one-step method, and the grafting rate was 29 %. PVDF membrane and PVDF-g-HFBMA membrane (PVDF-H) were prepared by NIPS. 19 F NMR and gel permeation liquid chromatography (GPC) results showed that HFBMA monomer was successfully grafted onto the main chain of PVDF by ATRP. The chemical compositions of PVDF membrane and PVDF-g-HFBMA membrane before and after alkali treatment were investigated by Fourier transform infrared spectrometer (FT-IR) and X-ray photoelectron spectroscopy (XPS). The membrane morphology was investigated by scanning electron microscopy (SEM). HFBMA replaced fluorine atoms and grafted onto PVDF, reducing the removal of HF groups and the formation of C C on the membrane surface. Following the alkali treatment, the whiteness of the PVDF membrane decreased by 95.62 %, and the elongation at break reduced by 56.66 %. The whiteness of the PVDF-g-HFBMA membrane decreased by 42.08 %, while the elongation only reduced by 2.88 %.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2021
·Vol. 43
·期 4
·2100599
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IF 5.734
Kang Fu,Guoxian Zhang,Yibin Liu,Jiaojun Tan,Hepeng Zhang,Qiuyu Zhang
Mechanically robust superhydrophobic coatings have been extensively reported using chemically susceptible inorganic fillers like slica, titanium dioxide, and zinc oxide for constructing micro-nano structures. Organic particles are good candidates for improving chemical resistance, whereas the synthesis of organic particles with well-defined and stable micro-nano structures remains exclusive. Here, an all-organic, cross-linked superhydrophobic coating comprising raspberry-like fluorinated micro particles (RLFMP) and fluorinated polyurethane (FPU) is prepared via thiol-click reaction. Benefiting from the robust micro-nano structure of RLFMP and the excellent flexibility of FPU, the coating can maintain superhydrophobicity after severe alkali corrosion or mechanical damage, while the superhydrophobicity can be repaired readily by the fast recovery of micro-nano roughness and migration of branched fluoroalkyl chains to the coating surface. This design strategy is expected to provide a good application of thiol-click chemistry.
研究领域:
材料科学
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表面化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT & CONCRETE COMPOSITES
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2022
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IF 9.93
Cong Wu,Bing Yin,Dongshuai Hou,Shaochun Li,Xinpeng Wang
Core-shell polymer coating is a significant means of improving the surface protection of cement-based materials. In this paper, a novel strategy for the paraffin-doped polystyrene acrylate-polysiloxane core-shell emulsions (CSP) are proposed by combining polyaddition and polycondensation reactions , integrating the superior corrosion-resistance of PSA emulsions with the high-hydrophobicity of siloxane emulsions. The CSP emulsions have excellent physical stability and rheological behavior , with a lower proportion of unsaturated bonds and lower content of chemically bound water. The core-shell structure promotes the formation of Si–O bonds between the polymer molecules and the cement matrix , and more conducive to the formation of new silicate crystals on the cement hydrate surface. Macroscopically, the surface energy of the cement samples treated with CSP coating is below 16.7 mJ/m 2 , while its superficial nanoscale papillae give a water contact angle of almost 140°. The capillary absorption coefficient of the Portland concrete treated with CSP coating can be decreased to only 2.09 g/(m 2 ·h 0.5 ). Meanwhile, the corrosion rate of Cl − and SO 4 2− on the cementitious materials are significantly inhibited by the CSP membrane, reducing the levels of Friedel's salt, ettringite and gypsum generated by ionic corrosion, respectively. Furthermore, the CSP membranes have excellent molecular structural integrity and high cross-linkage under acid/alkaline corrosion and photo-thermal aging, maintaining superior adhesion and corrosion resistance with the cement substrate.
研究领域:
材料科学
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土木工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）