Polymers
·
2023
·Vol. 15
·期 11
·2441
·
IF 5
Weiping Li,Dajiang Mei,Jihu Wang,Hui Wu,Shaoguo Wen
Microencapsulated phase change materials (MCPCM) as a green energy storage material not only prevent leakage of phase change materials but also increase the heat transfer area of phase change materials. Extensive previous work has shown that the performance of MCPCM depends on the shell material and MCPCM with polymers, as the shell material suffers from low mechanical strength and low thermal conductivity. In this study, a novel MCPCM with hybrid shells of melamine-urea-formaldehyde (MUF) and sulfonated graphene (SG) was prepared by in situ polymerization using SG-stabilized Pickering emulsion as a template. The effects of SG content and core/shell ratio on the morphology, thermal properties, leak-proof properties, and mechanical strength of the MCPCM were investigated. The results showed that the incorporation of SG into the shell of MUF effectively improved the contact angles, leak-proof performance, and mechanical strength of the MCPCM. Specifically, the contact angles of MCPCM-3SG were reduced by 26°, the leakage rate was reduced by 80.7%, and the breakage rate after high-speed centrifugation was reduced by 63.6% compared to MCPCM without SG. These findings suggest that the MCPCM with MUF/SG hybrid shells prepared in this study has great potential for application in thermal energy storage and management systems.Keywords:microencapsulated phase change materials;sulfonated graphene;Pickering emulsion
研究领域:
材料科学
·
能源工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 15
·3068
·
IF 4.967
Junjie Wang,Mingyu Li,Gaoliang Wei
A sulfophenyl-functionalized reduced graphene oxide (SrGO) membrane is prepared. The SrGO membranes have a high charge density in water and could provide many atomically smooth nanochannels, because of their strong ionized-SO3H groups and low oxygen content. Therefore, the SrGO membranes have an excellent performance in terms of high permeance and high rejection ability. The permeance of SrGO membranes could be up to 118.2 L m−2h−1bar−1, which is 7.6 times higher than that of GO membrane (15.5 L m−2h−1bar−1). Benefiting from their good electrical conductivity, the SrGO membranes could also function as an electrode and demonstrate a significantly increased rejection toward negatively charged molecules and positively charged heavy metal ions such as Cu2+, Cr3+and Cd2+, if given an appropriate negative potential. The rejection ratios of these metal ions can be increased from <20% at 0 V to >99% at 2.0 V. This is attributed to the enhanced electrostatic repulsion between the SrGO membrane and the like-charged molecules, and the increased electrostatic adsorption and electrochemical reduction in these heavy metal ions on the membranes. This study is expected to contribute to efficient water treatment and the advance of graphene-based membranes.Keywords:composite membrane;porous materials;sulfonated graphene;nanofiltration;electrochemistry
研究领域:
材料科学
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环境工程
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DOI
PubMed
高影响因子
Coatings
·
2021
·Vol. 11
·期 2
·251
·
IF 2.881
Jijia Zhang,Jihu Wang,Shaoguo Wen,Siwei Li,Yabo Chen,Jing Wang,Yan Wang,Changrui Wang,Xiangyi Yu,Yan Mao
In this paper, an environmentally friendly waterborne polyurea (WPUA) emulsion and its corresponding coating were prepared, which was characterized by dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and scanning electron microscopy (SEM). To improve the performance of the coating, we doped sulfonated graphene (SG) into WPUA to prepare composite coating (SG/WPUA). SG can be uniformly dispersed in WPUA emulsion and is stable for a long time (28 days) without delamination. The water resistance of the composite coating with 0.3 wt.% SG nanofiller was improved; the water contact angle (WCA) result was SG/WPUA (89°) > WPUA (48.5°), and water absorption result was SG/WPUA (2.90%) < WPUA (9.98%). After water immersion treatment, SEM observation revealed that the SG/WPUA film only generated enlarged microcracks (100 nm) instead of holes (150–400 nm, WPUA film). Polarization curves and electrochemical impedance spectroscopy (EIS) tests show that SG nanosheets with low doping content (0.3 wt.%) are more conducive to the corrosion resistance of WPUA coatings, and the model was established to explain the mechanism.Keywords:waterborne polyurea;synthesis;sulfonated graphene;anti-corrosion
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13565-13570
·
IF 0
Yingying Fan,Dongxue Han,Bin Cai,Weiguang Ma,Mohsin Javed,Shiyu Gan,Tongshun Wu,M. Siddiq,Xiandui Dong,Li Niu
TiO2 is an abundant and environmentally benign material, but has a wide band gap, which greatly confines its applications in photocatalysis. Doping and modifying the material composition are both generally used to change and control the photocatalytic activity of semiconductors. Herein, we describe a method and resulting activity of depositing Ce-/S-codoped TiO2 nanoparticles (NPs) on water-soluble sulfonated graphene (SGE) sheets, which guarantees a direct contact and satisfactory electron transfer between the semiconductor and graphene. The Ce/S–TiO2 NPs are homogeneously fixed on the surface of SGE sheets with an average particle size of ∼7 nm. The resulting composite showed noticeable activity in photodegrading methyl orange (κ = 0.425 h−1). This improved performance can be attributed to the synergistic effects of Ce- and S-codoping toward TiO2 and the composite action between TiO2 NPs and SGE. This type of novel composite is expected to stimulate the development of doped and graphene-involved photocatalysts for addressing environmental problems.
研究领域:
材料科学
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环境科学
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产品关联
DOI
Polymers
·
2018
·Vol. 10
·期 1
·75
·
IF 2.935
Jianyan Feng,Xuechuan Wang,Peiying Guo,Yujie Wang,Xiaomin Luo
In order to improve the dispensability of graphene oxide (GO) in waterborne polyurethane (WPU), sulfonated graphene (SGO) with superior dispersity was prepared by modifying graphene oxide with sodium 2-chloroethane sulfonate to introduce hydrophilic sulfonic groups into the structure. SGO/WPU composites were prepared using isophorone diisocyanate (IPDI), polytetramethylene ether glycol (PTMEG 2000), dimethylolpropionic acid (DMPA) and SGO as raw materials. The influence of SGO content on composite properties were investigated. The structure and morphology of SGO and SGO/WPU composites were characterized by infrared spectroscopy, X-ray diffractometry and transmission electron microscopy etc. Their mechanical properties and wear resistance were analyzed as well. The experimental results showed that SGO was successfully grafted onto polyurethane macromolecule by an in situ method and, with the introduction of sulfonic groups, the interfacial compatibility of GO and PU was improved significantly so that SGO evenly dispersed into WPU. The SGO that was grafted onto WPU macromolecules exhibited layered morphology with nanometers in the WPU matrix. With increasing SGO content, the tensile strength and the wear resistance of the film increased, but the addition of more than 0.8 wt % SGO yielded unfavorable results. When the added amount of SGO was 0.8 wt % of WPU, the tensile strength of the composite film was 46.53% higher than that of the blank group, and the wear resistance of the film was remarkably improved, which was due to a strong interaction between the SGO and WPU phases. Thus, the conclusion can be drawn that appropriate amount of SGO addition can enhance the mechanical properties of SGO/WPU composite film.Keywords:sulfonated grapheme;waterborne polyurethane;in situ method;mechanical resistance properties;wear resistance
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2012
·Vol. 2
·期 11
·2332-2340
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IF 0
Jiefeng Hu,Yuping Wang,Min Han,Yaoming Zhou,Xiaoqing Jiang,Peipei Sun
Fe3O4 and Pd nanoparticles were assembled on sulfonated graphene (s-G) by an easy chemical approach and characterized by transmission electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. The resulting material could be dispersed homogeneously in water or water/ethanol and further used as an excellent semi-heterogeneous catalyst for the Suzuki–Miyaura cross-coupling reaction in an environmentally friendly solvent under ligand-free ambient conditions. The high heterogeneous catalytic activity appears to be due to the small size of Pd nanoparticles and homogeneous distribution of the nanoparticles on the Fe3O4/s-G matrix. In addition, the catalytic activity did not deteriorate even after repeated applications, which may be due to the easy and efficient magnetic separation of the catalyst and the high dispersion and stability of the catalyst in an aqueous solution.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
ACS Applied Energy Materials
·
2021
·
IF 6.024
Huiling Chen,Pan He,Meng Li,Yuehua Wen,Gaoping Cao,Jingyi Qiu,Hai Ming,Pengcheng Zhao,Songtong Zhang
In this paper, sulfonated graphene (SA-GE) with the functions of both high electronic conductivity and fast Li+ transport is utilized to modify high-voltage LiNi0.5Mn1.5O4. We show that LiNi0.5Mn1.5O4 modified with 2 wt % SA-GE exhibits extremely long cycling life, achieving a great capacity retention of 98.0% after 1000 cycles at the loading of 2.6 mg cm–2 and 99.0% after 350 cycles at the loading of 6.0 mg cm–2 under 1C. Besides, the rate capability is also greatly improved (discharge capacity remains 78.5 mAh g–1 at 10C). It is revealed that the SA-GE-involved layer could significantly inhibit the rapid growth of the cathode electrolyte interphase (CEI) layer at 5.0 V, which mainly contributes to an enhanced Li+ diffusion kinetics without sacrificing the electronic conductivity of graphene coating. Thus, the polarization degree and charge transfer resistance are significantly mitigated. Furthermore, structure degradation of the cathode is avoided by reducing the side reactions and the dissolution of transition-metal ions. It is thus well demonstrated that chemical decorations of graphene modifiers with an optimized amount of functionized sulfonic acid groups can be a promising strategy to construct lithium-ion batteries with long life and high energy density.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Mao-ping Wei,Hui Chai,Ya-li Cao,Dian-zeng Jia
One of the major challenges encountered in some conventional nano-structured adsorbents such as graphene oxide (GO) and graphene is the structural limits including serious aggregation and hydrophilic surface in water. And the sulfanilic acid functionalized graphene oxide (SGO) can powerfully attract positively charged pollutants. Therefore, the SGO served as an adsorbent to remove dyes and toxic metal ions from aqueous solution were intensively investigated. At the same time the reduced sulfonated graphene oxide (rSGO), reduced graphene oxide (rGO), and graphene oxide (GO) were performed as the comparative samples. The results showed that the maximum adsorption capacities of SGO were 2530 mg/g for methylene blue and 415 mg/g for Pb 2+ , which was much higher than that of the contrast samples and adsorbents reported in literatures. The adsorption of SGO was investigated systematically including the saturated adsorption capacities, isotherm, and kinetic adsorption process. The SGO displayed high adsorption efficiency and superior adsorption capacity toward metal ions and dyes, which is mainly attribute to the good dispersibility and the multiple adsorption sites of SGO. These results are promising not only providing effective adsorbing heavy metal ions and organic dyes, but also gaining insights into adsorption mechanism of graphene materials.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 19
·10569-10577
·
IF 3.049
Jianru Ma,Wenzhi Li,Shengnan Guan,Qiying Liu,Qingqing Li,Chaofeng Zhu,Tao Yang,Ajibola Temitope Ogunbiyi,Longlong Ma
Sulfonated graphene (SG) was prepared and employed to convert corn stalk and xylose into furfural. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) were used to characterize SG. The effects of reaction time, temperature, substrate loading, catalyst dosage and solvents on the reaction were researched and optimized. SG exhibited high catalytic activity in the conversion of xylose and corn stalk to furfural. A fairly high furfural yield of 96% was achieved at 150 °C from xylose and a 71.9% furfural yield was obtained when using a 10.7 ratio (mass ratio: xylose to SG) at 140 °C. While a 48% furfural yield was obtained from corn stalk (based on the starting combined moles of xylan and glucan in corn stalk; yield was >100%, if based on only xylan) using a substrate loading (corn stalk to catalyst mass ratio) of 2.14 and a 19% 5-hydroxymethylfurfural (5-HMF) yield was obtained. What's more, a 43.9% yield of furfural was obtained in only 20 min. In addition, the reusability of SG was also investigated and shown to have good stability for xylose dehydration.
研究领域:
生物化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 16
·期 11
·4669-4679
·
IF 6.852
Jinxia Zhou,Yu Wang,Xinwen Guo,Jingbo Mao,Shuguang Zhang
A sulfonated graphene catalyst (SG) prepared by grafting sulfonic acid-containing aryl radicals onto the two-dimensional surface of graphene was used for the etherification of glycerol with isobutene, and a reaction–extraction process was developed for easy realization of product isolation and catalyst recycling. With its ultra thin two-dimensional open substrate, stable sulfonic acid sites, amphiphilic properties and light texture, SG exhibited excellent catalytic performance in the etherification reaction. At 60–70 °C with 4 wt% catalyst loading and a molar ratio of isobutene/glycerol 4, a nearly complete conversion of glycerol in 7 h and a selectivity of more than 90 mol% to desired multi-butyl glycerol ethers were achieved. Moreover, undesired oligomerization of isobutene was successfully suppressed. When extracted with fresh glycerol, the mixture after reaction was successfully layered to two phases, with a transparent liquid containing no less than 96 wt% di- and tri-butyl glycerol ethers in the top phase as a product and a black mixture consisting of glycerol and SG in the bottom phase which can be used to start a new run with fresh isobutene addition. During six consecutive reaction–extraction cycles the catalyst maintained its robust performance.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Dongliang Qian,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Water pollution has led to increased attention on wastewater treatment and renewable industries. Various materials have been developed for removing pollutants from water. However, materials capable of emulsion separation and soluble-contaminant degradation in a single step are rare. We report a TiO 2 /sulfonated graphene oxide/Ag nanoparticle (TSA) membrane, which possesses useful wettability and photocatalytic properties. A photocatalytic TiO 2 nanorod array-based mesh with favorable wettability properties is integrated with a sulfonated graphene oxide/Ag layer, to form a bifunctional TSA membrane. The membrane exhibits excellent oil/water separation performance, and efficient photodegradation of solubilized methylene blue under ultraviolet irradiation. The membrane also exhibits excellent stability and durability, with a water contact angle of > 150°, and a high separation efficiency after 10 consecutive cycles. The membrane therefore has potential in sewage and wastewater treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2025
·Vol. 151
·期 4
·04025013
·
IF 1.6
Yongli Hu,Jiahao Liang,Yijin Tan,Yang Yu,Yiwen Chen,Zijun Li,Chanjuan Liao
The unique benefits of membrane therapy technology make it a popular choice. However, polyvinylidene fluoride (PVDF) and polysulfone (PSF) can readily become contaminated in practical applications. Therefore, in this study, sulfonated graphene oxide (SGO) was doped as an additive at various concentrations, along with dopamine (DA) and silver (Ag) as surface modifiers, to prepare a DA-Ag–modified SGO/PSF/PVDF ultrafiltration membrane with enhanced antipollution performance. The water flux, mechanical strength, and other characterization tools were then applied to analyze the hydrophilicity and structural composition of the membrane. The flux measurement demonstrated that SGO had better hydrophilicity and contamination resistance than graphene oxide (GO). The membrane exhibited the best performance when SGO was added at 0.3 g in the casting solution. The result showed a water flux of 675.80 L m−2 h−1, which was 1.27 times greater than that of the neat membrane. Furthermore, the retention of bovine serum albumin (BSA) was 96.00% and the flux recovery was 85.60%. The antibacterial rate against Escherichia coli and Staphylococcus aureus was up to 97.96% and 96.20%, respectively. Interestingly, the membrane still implied a sustainable antimicrobial effect after 90 days, demonstrating its long-lasting bacteriostatic properties.
研究领域:
材料科学
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环境工程
·
生物医学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）