Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yongbo He,Mengqi Liu,Linzhi Zhai,Hongshuang Li,Peng Song,Xiufang Zhu,Yubin Tang
The metal organic framework (MOF) polycrystalline membranes on stainless steel mesh (SSM) are urgently required for effective oil-water separation, but the affordable preparation still remains a challenge. Herein, we report a series of UiO-66-NH 2 /SSM films, which are developed by a rational ‘seeding-assisted secondary growth’ method. Results depict that the proposed method greatly shortens the synthesis time, and helps to achieve a continuous and uniform modification of UiO-66-NH 2 on SSM, and hence contributes to a superior hydrophilicity and superoleophobicity for UiO-66-NH 2 /SSM with minimum water contact angle of 32° and maximum underwater oil contact angle of 150°, respectively. Specifically, the UiO-66-NH 2 /SSM-600–2 has total permeation fluxes and separation efficiencies of ca. 8.4×10 4 L·m −2 ·h −1 and 100% for the n-hexane-, petroleum ether- and chloroform-water emulsions (1% volume ratio), which exceed numerous polycrystalline membranes reported so far. It also exhibits a great durability with only 0.1% loss of separation efficiency after 8 cycles. Furthermore, outstanding acid-resistivity and salt-tolerance are also presented. Our work supplies a new strategy to construct UiO-66-NH 2 /SSM, and the decent properties confirm a huge potential for practical use in oil-water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Liang Pan,Guoxi Li,Zhaoyang Wang,Dongbao Liu,Weikang Zhu,Chunyi Tong,Rilong Zhu,Shilin Hu
To reduce the corrosion of Q235 steel, environment-friendly and efficient N-doped carbon dots (N-CDs) were synthesized using 4-amino salicylic acid (4-ASA) and l-histidine (l-His) as precursors. The corrosion inhibition behavior of N-CDs for Q235 steel in 1 M HCl solution was systematically investigated using a weight-loss experiment, an electrochemical test, and corrosion morphology. Results showed that N-CDs could effectively inhibit the corrosion of Q235 steel, and the inhibitory efficiency reached 93% at 50 mg L–1. Quantum chemistry and molecular dynamics were used to study the inhibition mechanism of N-CDs. The results demonstrated that N-CDs exhibited a strong adsorption force on metal and the adsorption process followed the Langmuir adsorption isotherm, indicating physical/chemical mixed adsorption.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2021
·
IF 5.485
Qian Zhao,Liang Hao,Fei Li,Tongyang Liu,Yiqiang He,Jun Yang,Yifan Zhang,Yun Lu
The hydrothermal method was used to prepare flexible BiOCl-BiOI films on one stainless steel wire mesh. Nano-flower like BiOCl-BiOI crystals consisted of nanoplates were formed, and BiOCl was uniformly distributed. The XPS (X-ray photoelectron spectroscopy) spectra confirm the formation of BiOCl-BiOI heterojunction, which enhanced the visible light absorption of the BiOI film. The photocatalytic activity of the BiOCl-BiOI film in degrading RhB and MB was elevated by at most 8.7 and 2.4 times, respectively, comparing with the individual BiOI film. We designed and constructed a piezo/photocatalytic platform in which the prepared BiOCl-BiOI films were fixed on a rotating shaft. Compared with the static state, the photocatalytic activity of the BiOCl-BiOI film was increased by 1.4 times when the shaft was rotating. We believe that the enhancement of the photocatalytic activity should be ascribed to the piezoelectric field by introducing bending deformation, which accelerated the separation of photogenerated electrons and holes. The improvement mechanism of the photocatalytic and piezo/photocatalytic performance was proposed and discussed. The flexible BiOCl-BiOI heterojunction films show significant application potential in the pollution control of fluid fields such as rivers, oceans, waterfalls, and air.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jihao Zuo,Yi Zhou,Zehao Chen,Ting Zhao,Qing Tan,Cailong Zhou,Xinjuan Zeng,Shouping Xu,Jiang Cheng,Xiufang Wen,Pihui Pi
Design of charged materials for demulsification of ionic surfactant-stabilized oil-in-water emulsions is emerging in recent years. Herein, a superwetting stainless steel mesh with Janus surface charges (Janus SSM) was prepared by respectively brush-coating polyethyleneimine/aminated carbon nanotubes (PEI/CNTs-NH 2 ) coating and polyacrylic acid (PAA) coating on its two sides. Two demulsification mechanisms, i.e., electrostatic attraction-repulsion and electrostatic repulsion-attraction based on the synergism of two oppositely charged sides were proposed. Combined with the superwettability and optimized pore size, the Janus SSM can successfully be used to demulsify, coalesce and separate emulsions. In detail, the Janus SSM exhibited separation efficiencies of up to 99.29%, 97.12% for SDS- and DTAC-stabilized oil-in-water emulsions respectively under the electrostatic attraction-repulsion mechanism, and up to 97.10%, 98.57% under the electrostatic repulsion-attraction mechanism. The results indicated that the electrostatic attraction-repulsion mechanism proposed in this study is conductive to achieving higher efficiency in emulsion separation. Furthermore, excellent durability extend the operation life of Janus SSM. This Janus SSM, which combines opposite charges on its two sides, may advance the development of charged materials for emulsion separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xiangxiao Qiu,Jifeng Li,Zhanqing Liu
Earlier investigations have shown that corrosion products of weathering steel presented photovoltaic effect under illumination. In this study, we explored the influence of chloride ions on this effect and the related corrosion behavior. Open circuit potential, electrochemical impedance spectroscopy and Mott- Schottky plots were recorded on weathering steel surface treated with NaCl after 3 days exposure in simulated atmospheric condition under illumination. For comparison, similar study was also performed on the weathering steel surface without NaCl deposition. There was clearly photoelectrochemical response difference between the samples. It was found that the defects concentration and electric conductivity of the corrosion products were higher due to the chloride ions migration, which was promoted by incorporation of photo-generated holes under illumination. The detailed mechanism was discussed in this study.
研究领域:
材料科学
·
电化学
·
腐蚀工程
✓ 已验证
DOI
高影响因子
CORROSION
·
2022
·Vol. 78
·期 4
·324-338
·
IF 2.094
Xu Yangshuhan,Mao Jie,Li Minghua,Wang Shufen,Yu Tingting
Corrosion of carbon steel causes many losses, hazards, and contaminations to our daily life. In this article, epoxy synergistically added with hydrophobic nano-silica and graphene was prepared to provide corrosion protection for carbon steel. Graphene can act as filler to improve the corrosion resistance of epoxy, but the aggregation of graphene severely affects its application. Embedding hydrophobic nano-silica into graphene sheets contributes to the good dispersity of graphene in an epoxy matrix. Besides, SiO 2 can also act as another filler to improve corrosion resistance. Hence, the synergistical addition of hydrophobic nano-silica and graphene into epoxy can provide better corrosion resistance for modified epoxy coating. A scanning electron microscope was used to investigate the microstructures of modified epoxy coating. Coating wettability was measured by a static contact angle measurement instrument. The anticorrosive behaviors of modified coatings were measured by an electrochemical workstation. The corrosion mechanism was analyzed by equivalent circuits simulation. According to the results, the modified coating with impedance of about 10 8 Ω·cm 2 (10 mHz) at 100 d immersion still showed excellent anticorrosive performance. In general, epoxy doped with hydrophobic nano-silica and graphene displays better corrosion protection than epoxy without modification.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Cheng Yuan,Yu Liu,Guangqiang Li,Yongshun Zou,Ao Huang
The microporous refractory with low thermal conductivity shows a promising application prospect as tundish lining. In this study, the interactions between microporous magnesia aggregates and oxide inclusions in steel were explored. The experimental results and thermodynamic calculation show that the interaction process of microporous magnesia aggregates and oxide inclusions at high temperature can be divided into dissolution, reaction and post-reaction. The microporous magnesia aggregates can absorb the inclusions in steel by reaction and liquid phase penetration. The microporous magnesia aggregates have a strong adsorption for Al 2 O 3 and TiO 2 . Moreover, the microporous magnesia aggregates mainly absorb SiO 2 by penetration, but excessive SiO 2 will lead to the serious corrosion of microporous magnesia aggregates.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
CORROSION
·
2022
·Vol. 78
·期 12
·1166-1175
·
IF 2.094
Wang Changxuan,Zhang Wenjiao,Wang Yanli
In this paper, in order to improve the corrosion resistance of 316 stainless steel (316 SS) in molten chloride salt, an in situ grown Al 2 O 3 diffusion barrier is prepared through, first, electrodepositing an inner Ni-Al/NiO composite transition layer and an outer Ni layer through double-pulse composite electroplating technique, followed by annealing at 800°C for 12 h under Ar. The obtained Al 2 O 3 /Ni composite coating is dense and shows good adherence to the substrate. Then the corrosion resistance of Al 2 O 3 /Ni composite coating in molten 52MgCl 2 -48NaCl (wt%) is measured through electrochemical technique and immersion tests and the corrosion mechanism is also discussed. The results show that the 316 SS is effectively protected by the Al 2 O 3 /Ni composite coating from the corrosion of molten chloride salt.
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Kegui Zhang,Wenzhong Yang,Xiaoshuang Yin,Yun Chen,Ying Liu,Jinxun Le,Bin Xu
Konjac glucomannan (KGM) was modified with amino acids to synthesize polysaccharide esters (KGMA and KGMH) which were evaluated as corrosion inhibitor for mild steel in 0.5 M HCl solution by weight loss tests, Tafel curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The synthetic polymers were found to have the lower water absorbency and the higher water solubility than KGM. Gravimetric measurements showed the maximum efficiencies of KGMA and KGMH for decreasing the corrosion rate of metal at 2000 ppm are up to 89.9% and 92.4%, respectively. Polarization curves indicated polysaccharide esters could retard both hydrogen evolution reaction and metal dissolution reaction and that the inhibitory effect was concentration dependent. Besides, EIS studies demonstrated the corrosion resistance of mild steel in hydrochloric acid was enhanced by polymer additives. The observations on mild steel surface by SEM suggested the metallic substrate obtained good protection against corrosion in inhibitor-containing HCl solution. The adsorptive behavior of polymer molecules including physisorption and chemisorption obeyed Langmuir isotherm and UV–vis spectra revealed the formation of inhibitor-ion complex. The better performance of KGMH on corrosion inhibition was attributed to the easier transfer of π-electron or n -electron, which was confirmed by quantum chemical calculations.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Coatings
·
2024
·Vol. 14
·期 2
·198
·
IF 2.9
Fengqin Li,Yuxue Hu,Xiaoming Feng,Guizhong Tian
In order to improve the anti-fouling of stainless steel surfaces in outdoor or humid environments, a superhydrophobic modification is often used to improve its self-cleaning performance. However, the mechanical stability of superhydrophobic surfaces remains a challenge. In this paper, a two-step preparation method was adopted to prepare the micro–nanocomposite coating, which innovatively combined “top-down” and “bottom-up” approaches, and also coupled together two key factors that affect superhydrophobicity: a rough microstructure, and low surface energy. The silver mirror, adhesion, and pollution-resistance results show that the composite coating samples, which were obtained by optimizing the preparation process, have excellent water repellency and self-cleaning properties. Meanwhile, the samples demonstrate outstanding mechanical stability, and can resist damage from sandpaper and tape. The two-step preparation method was simple, fast, and efficient. This method could be popularized and applied to the preparation of superhydrophobic surfaces on metal substrates.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiangyu Ge,Linghao Zhang,Qiuyu Shi,Yuhao Xing,Yanfei Liu,Zhengfeng Cao,Wenzhong Wang
Achieving macroscopic superlubricity in electric environments on steel surfaces remains a challenge. This study achieved macroscopic superlubricity on steel surfaces by employing graphene oxide (GO) nanosheet additives with electric stimulation. Multiple factors were studied regarding the effect on lubrication performances. The morphology of the GO adsorption film on the intermittent contact surface (disc) is the main factor affecting the COF, as the continuous contact surface (ball) is required to overcome the peaks of GO film during sliding. The mechanism underlying the friction reduction is concluded as follows: when the intermittent contact surface (disc) was the positive pole, negatively charged GO migrated towards it, forming an adsorption film on its surface. The surface layer orientation of the GO film is relatively smooth, attributed to its contact with the negative pole (ball), resulting in friction reduction. This study illustrates the feasibility of achieving macroscopic superlubricity on steel interfaces through electric stimulation, thereby laying the groundwork for practical applications of superlubricity in engineering contexts, particularly in electric environments.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE STRUCTURES
·
2024
·
IF 6.3
Zhihao Zhao,Shuangqing Sun,Chunling Li,Songqing Hu
Pipeline steels are among the most common engineering materials and are used extensively in various industries. Therefore, it is essential that these materials are hydrophobic and corrosion resistant . Herein, a simple method to prepare a superhydrophobic coating on X65 steel is proposed. Firstly, the black oxide coating (BO) was grown in situ on X65 steel surface, utilizing its morphology advantage to build the micro-nano structure, where they showed a water contact angle (WCA) of 158°. After fluorination, the WCA of the coating increased to 163°. The prepared superhydrophobic samples were exposed to air and salt spray test for a 30-day durability study, where the long-lasting superhydrophobicity of the coating demonstrated its wide applicability. In addition, the coating also exhibited excellent corrosion resistance and self-cleaning property. This work provides a simple and low-cost technique for designing superhydrophobic coatings on steels.
研究领域:
材料科学
·
表面工程
✓ 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）