CARBON
·
2024
·
IF 10.5
Jiarong Zhang,Long Yu,Ya'nan Zhao,Tianran Zhao,Yi'na Yang,Chunna Yu,Chang Zhao,Guangjian Xing
The urgent need for multifunctional, high-performance materials is critical in addressing environmental pollution and energy shortages faced by contemporary society. This research presents innovative NH 2 -MIL-88B/Ta 4 C 3 T X /graphene aerogels that exhibit exceptional capabilities in photocatalysis and thermal energy storage utilizing solar energy. Synthesized through a combination of hydrothermal and freeze-drying methods, these aerogels feature unique structural characteristics, including a hierarchical porous structure, low density, and a large specific surface area. Furthermore, the synergistic effects of NH 2 -MIL-88B, Ta 4 C 3 T X MXene, and the aerogel matrix contribute to remarkable physicochemical properties, such as high sunlight absorptivity and an optimal optical band gap that aligns well with the solar spectrum. These attributes enable the aerogels to photodegrade various dye and antibiotic drug solutions with high concentrations. The photodegradation efficiencies achieved were 75.57 % for Congo red, 61.56 % for methylene blue, and 58.57 % for tetracycline hydrochloride. Additionally, these aerogels exhibit significant adsorption capacities for various dyes and drugs. Moreover, when the phase change material polyethylene glycol is successfully integrated into the aerogels, they exhibit excellent thermal energy storage performance with leak-proof capabilities. A high photothermal conversion efficiency of 90.15 %, a phase enthalpy of 202.13 J g −1 , and an enthalpy efficiency of 98.55 % provide evidence for this. This work provides valuable insights into the development of multifunctional aerogels aimed at addressing the challenges of wastewater treatment and energy shortages.
研究领域:
环境科学
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材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 8
·2377-2390
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IF 2.531
Wang Shuangshuang,Feng Jianwei,Meng Qinghan,Cao Bing,Tian Guiying
The search for highly efficient carbon materials with high desalting capacity for the brackish water desalination is still indispensable. In this study, boron and nitrogen co-doped graphene xerogels are prepared by a simple sol-gel method with atmospheric drying and carbonization, in which the rod-like primary particles are attached on the graphene sheets via crosslinking reaction of boric acid-melamine-resorcinol-formaldehyde (BMRF). With the increase in doping ratio, the carbonized BMRF gels display high micropore surface area and abundant doping sites. The maximum doping contents of boron (1.54 at.%) and nitrogen (8.72 at.%) can be achieved in the co-doped graphene xerogel with the molar ratios of C 6 H 6 O 2 and H 3 BO 3 of 1.2, which displays superior specific capacitance (242 F g −1 at a current density of 0.1 A g −1 ) and high capacitance retention (92.7% after 5000 cycles at a current density of 2.0 A g −1 ). The co-doped graphene xerogels are evaluated as electrode materials for the electrochemical desalination of brackish water. Compared to the bare graphene xerogel, the co-doped graphene xerogel displays high electrosorption capacity of 18.45 mg g −1 and high charge efficiency of 45% for NaCl solution under an applied voltage of 1.6 V.
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
CARBON
·
2022
·
IF 11.307
Yiying Yue,Yu Wang,Junyao Li,Wanli Cheng,Guangping Han,Tao Lu,Chaobo Huang,Qinglin Wu,Jianchun Jiang
Oil spillage accidents have caused serious environmental issues, and resulted in oil-cleaning materials receiving widespread attention. In this study, lignin, a crucial recalcitrant component in biomass utilization , was employed to mediate the preparation of graphene aerogel for oil/water separation and rapid regeneration through combustion. The resultant aerogel exhibits ultralight weight (14.22 mg/cm 3 ), high porosity (99.01%), good mechanical properties (1.361 ± 0.04 MPa), super-hydrophobicity (Water Contact Angle = 154.9°), excellent oil and water separation performance (adsorption capacity of chloroform = 102 g/g), and rapid regeneration via direct ignition within 1 min. In addition, the obtained aerogel not only maintained high oil absorption rates in harsh environments (strong acid, strong alkali, high salinity, and high temperature) and facilitated continuous separation of oil and water through pumping but also retained approximately about 90% of the initial absorption capacity after at least 20 combustion cycles. Therefore, based on these extraordinary properties, the obtained aerogel demonstrates great potential for the treatment of marine oil spills. Furthermore, this work may provide a new approach for realizing the high-value utilization of lignin.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 25
·10654-10661
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IF 3.288
Qi Wu,Wei Wu,Xue Zhan,Xiudan Hou
A simple, facile method was adopted to synthesize three-dimensional chitosan grafted graphene oxide aerogel modified silica (3D CS/GOA@Sil) as an eco-friendly, sustainable extraction material for the preconcentration of phenoxy acid herbicides. An amidation reaction realized the immobilization of CS and GO on the surface of silica, which was followed by a freeze-drying technique to yield the CS/GOA@Sil with 3D architecture structure. The successful synthesis and properties of 3D CS/GOA@Sil were characterized and confirmed by using scanning electron microscopy, infrared spectroscopy, BET adsorption–desorption analysis, and thermogravimetric analysis. The surface area of 3D CS/GOA@Sil was twice that of the individual GO@Sil. Besides, the adsorption and extraction times were also shorter due to the ordered porous structure and rapid mass transfer. Under the optimal conditions, coupled with a high-performance liquid chromatography-ultraviolet detector, this as-established method presented wide linearities with desirable correlation coefficients (≥0.9936) and low limits of detection (≤1.5 μg L−1). Finally, it was applied in the analysis of phenoxy acid herbicides in vegetables, and satisfactory relative recoveries of 62.38–102.92% of spiked standard solutions with different concentrations were obtained.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Donglin Zhao,Yangyang Wang,Siyu Zhao,Muhammad Wakeel,Zheng Wang,Rehan S. Shaikh,Tasawar Hayat,Changlun Chen
In this study, graphene aerogel (GA) was successfully prepared through a simple hydrothermal method. The resulting GA exhibited a porous network structure with a large specific surface area (350.8 m 2 /g), ultra-light mass and easy separation from water. The pH IEP value of the GA was estimated to be 3.5. The adsorption process and the factors that affect adsorption capacity were studied. The adsorption could be conducted in a wide pH range from 2.0 to 7.0. The maximum adsorption capacity of GA towards U(VI) at pH 4.0 and T = 298 K was 238.67 mg/g calculated from the Langmuir model. The GA had greatly rapid adsorption property for the removal of U(VI) at pH 4.0. Kinetic data showed good correlation with pseudo-second-order equation. Fourier transform infrared spectroscopy and X-ray photoelectron spectrometry characterizations showed that GA adsorbed U(VI) through chemical interaction by oxygen-containing and nitrogen-containing groups functional groups. The results show that GA has excellent application potential as an adsorbent material for removing U(VI) from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2021
·Vol. 10
·期 7
·1616
·
IF 4.35
Xiudan Hou,Rong Ding,Shihai Yan,Haiyan Zhao,Qingli Yang,Wei Wu
A novel sorbent based on the ZrO2nanoparticles and poly(diallyldimethylammonium chloride)-modified graphene oxide aerogel-grafted stainless steel mesh (ZrO2/PDDA-GOA-SSM) was used for the extraction and detection of organophosphorus pesticides (OPPs). Firstly, the PDDA and GO composite was grafted onto the surface of SSM and then freeze-dried to obtain the aerogel, which efficiently reduced the accumulation of graphene nanosheets. It integrated the advanced properties of GOA with a thin coating and the three-dimensional structural geometry of SSM. The modification of ZrO2nanoparticles brought a selective adsorption for OPPs due to the combination of the phosphate group as a Lewis base and ZrO2nanoparticles with the Lewis acid site. The ZrO2/PDDA-GOA-SSM was packed into the solid-phase extraction (SPE) cartridge to extract OPPs. According to the investigation of different factors, the extraction recovery was mainly affected by the hydrophilic-hydrophobic properties of analytes. Effective extraction and elution parameters such as sample volume, sample pH, rate of sample loading, eluent, and eluent volume, were also investigated and discussed. Under the optimal conditions, the linearity of phoxim and fenitrothion was in the range of 1.0–200 μg L−1, and the linearity of temephos was in the range of 2.5–200 μg L−1. The limits of detection were ranged from 0.2 to 1.0 μg L−1. This established method was successfully applied to detect OPPs in two vegetables. There was no OPP detected in real samples, and results showed that the matrix effects were in the range of 46.5%–90.1%. This indicates that the ZrO2/PDDA-GOA-SSM-SPE-HPLC method could effectively extract and detect OPPs in vegetables.Keywords:graphene aerogel;ZrO2;solid-phase extraction;organophosphorus pesticides
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 55
·期 11
·4578-4591
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IF 3.442
Diao Shuai,Liu Huie,Chen Shuang,Xu Wenlong,Yu Anran
Graphene aerogels with different pore sizes, volumes and degrees of reduction were prepared through Pickering emulsion method. The controllable preparation of aerogels was achieved. The graphene aerogels prepared were characterized by FTIR and XPS. The adsorption capacity of pure oil by graphene aerogel was investigated. The graphene aerogels can adsorb pure oil quickly and hardly adsorb water. Linear relation exists between saturated adsorption capacities of graphene aerogels on oil and the densities of the oil adsorbed. The volume of the adsorbed organics on unit mass of the aerogel is 186.46 cm 3 g −1 . The occupancy rate in the aerogel pores is 73.71%. The factors affecting its adsorption rate on emulsified oil were investigated. The adsorption curves of graphene aerogels on emulsified oil conform to the pseudo-second-order kinetic model. The larger the inner diameter of the pore size in the graphene aerogels and the larger the outer surface area, the faster the adsorption rate of the emulsified oil would be. The adsorption rate of the rough internal with higher hydrophobicity decreases slightly, but as the degree of reduction increases, the hydrophobicity gradually increases and the adsorption rate increases gradually, so there should exist an optimum hydrophobicity value of aerogels for the adsorption of emulsified oil in water.
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
高影响因子
RSC Advances
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2020
·Vol. 10
·期 24
·14283-14290
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IF 3.119
Xin Zhang,Jie Su,Xueyuan Wang,Xiaolei Tong,Fanglian Yao,Caideng Yuan
Graphene aerogels (GAs) were synthesized via a one-step hydrothermal method. Generally, the pore shape and diameter of GAs are difficult to control or the preparation process is complicated, requiring a multi-step operation. Herein, a soft-template one-step hydrothermal synthesis process was proposed to produce GAs with controllable pore sizes. Cyclohexane and n-butanol were added to a graphene oxide suspension to form a uniform aqueous dispersion under emulsification by sodium lauryl sulfate. The reduction process may have occurred around the organic droplets during the hydrothermal reaction, and a large number of organic droplets became countless physical barriers inside the hydrogel. In the later freeze-drying and high-temperature calcination procedures, the droplets evaporated to form a rich pore structure. Compared to the conventional templating method, the organic template was volatilized during the drying process such that no additional process for removing the template was required. In addition, GAs prepared by the template method possessed lower density (2.66 mg cm−3) and better compression performance and, as an adsorbent material, absorbed organic matter and petroleum from wastewater more efficiently than GAs obtained by the traditional one-step hydrothermal method; Q for n-hexane reached 116, and Q for xylene reached 147; also, the GAs prepared by the soft template method can absorb all crude oil in water samples within 30 s.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Jingjing Li,Xiaoguang Li,Xiaoying Zhang,Jingxian Zhang,Yusen Duan,Xingbang Li,Dongliang Jiang,Takahiro Kozawa,Makio Naito
Indoor gaseous pollutants pose a great threat to human health, graphene aerogel (GA) has attracted more and more attention due to its high adsorption performance. However, the increase of the adsorption capacity together with high strength for long time and repeat using is still a challenge. In this study, a novel silica modification method was proposed to modify graphene aerogels with high strength and ultrahigh adsorption capability. Apart from its high adsorption capacity for liquid toluene, the adsorption capability to benzene, an indoor pollutant gas, was increased to 809.51 mg/g, which is higher than pure graphene aerogel and other carbon-based adsorbents such as graphene, activated carbon and single-wall carbon nanotubes. The enhanced adsorption performance is due to two reasons in addition to the electrostatic interactions. On one hand, tetraethyl orthosilicate (TEOS) could help to modify the pore structure of aerogel, reducing its average pore diameter and increasing its BET specific surface area. On the other hand, the addition of TEOS could help to improve the hydrophobicity of aerogel. The selective adsorption character of graphene aerogels to benzene/toluene binary system in the breakthrough experiment confirmed that the prepared graphene aerogels could also be used in the field of separation of multicomponent indoor pollutant gases.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2019
·
IF 5.04
Jin Li,Qin Wang,Lei Zheng,Hongbo Liu
A novel graphene aerogel has been synthesized from cellulose by an easy way through sol-gel reaction and carbonization . In this route, it can be found the products have a high yield about 48 % and form a specific porous networks assembled by graphene flake. The product sample like CGA-2, characteristic of a specific area about 1426.11 m 2 /g and total pore volume about 1.02 cm 3 /g, exhibits a remarkable performance for removing cationic dye like methylene blue (MB) in water. Of which the maximal MB adsorption capacity can be found about 610.85 mg/g in a neutral solution and 1.2 g/g in a basic solution. Under the condition of initial MB concentration of 100 mg/L and pH of 7.0, the adsorption equilibrium can be achieved on CGA-2 in 10 min, with MB removal ratio about 99 %. In the MB adsorption on CGA-2, the isotherm fits Langmuir model with correlation coefficient of 0.9905, and the kinetics follows pseudo-second-order model with correlation coefficient of 0.9999.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Xiaoming Wang,Li Li,Yan Lin,Jin Xu,Jiatao Zhao,Xiaoguang Zhang,Fei Wang,Xiaolin Wang
The use of porous media as a fixed bed for promoting methane hydrate formation has been endowed with great potential in hydrate-based energy storage. In this work, a graphene aerogel (GA) with a one-piece structure and ultralight weight was prepared and adopted for the first time as a fixed bed for methane hydrate formation. In particular, the effects of the filling ratio and hydrophobic–hydrophilic properties of GA on the promotion efficiency were comprehensively investigated. In the range of 84–95%, a lower filling ratio resulted in higher promotion efficiency, which at 84% increased the methane storage capacity and apparent storage capacity from 114.4 ± 7.6 and 52.4 ± 6.7 V/V to 146.3 ± 6.5 and 91.1 ± 13.0 V/V, respectively. Cryo-scanning electron microscopy (Cryo-SEM) demonstrated that the hydrates formed in the inner pores of GA but also revealed the existence of empty pores, indicating that part of the reaction solution migrated out of the GA. Fortunately, by regulating the hydrophilic–hydrophobic properties of GA, the migration of the reaction solution during hydrate growth could be controlled, and the methane storage capacity could be optimized. More importantly, GA produced excellent advantages in terms of gravimetric storage capacity over traditional media and, therefore, produced great potential in serving as an ultralight fixed bed for the industrial application of hydrate-based energy storage.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Feng Liang,Xuefeng Wei,Xinquan Zhou,Yafei Guo,Juan Miao,Hang Xu,Weiwei Lu,Ruichang Zhang,Ning Zhang,Shuge Peng
To obtain a high-efficiency and low-cost electrocatalytic anode for environmental pollutant degradation, a nitrogen doped graphene aerogel supported tin oxide (SnO 2 -NGA) composite catalyst was prepared and SnO 2 -NGA/Ti anode was fabricated. The influence of nitrogen doping content on electrocatalytic activity of the catalysts was investigated. The effects of current density and initial solution pH on degradation efficiency were studied. The SnO 2 -N 3.0 GA/Ti anode shows good catalytic activity for phenol degradation. The conversion of phenol and COD removal by SnO 2 -N 3.0 GA/Ti reached 83.6% and 61.2% within 4 h when applied current density was 5.00 mA/cm 2 and initial pH was 3.0. The SnO 2 -N 3.0 GA/Ti electrode has higher specific surface area, and lower charge transfer resistance. The nitrogen atoms doping increased the content of pyridinic N species, which is beneficial for providing more in-situ catalytic active sites and enhancing the production of reactive oxygen species, especially hydroxyl radical (•OH). This work provides a novel strategy for synthesis of electrocatalytic anode with enhanced activity for degradation of refractory organic pollutants in water.
研究领域:
环境科学
·
材料科学
✓ 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）