ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Junxiang Zhang,Zeyu Cheng,Xinbo Qin,Xi Gao,Rongping Yun,Xu Xiang
Salt lake brine has become a promising lithium resource, but it remains challenging to separate Li+ ions from the coexisting ions. We designed a membrane electrode having conductive and hydrophilic bifunctionality based on the H2TiO3 ion sieve (HTO). Reduced graphene oxide (RGO) was combined with the ion sieve to improve electrical conductivity, and tannic acid (TA) was polymerized on the surface of ion sieve to enhance hydrophilicity. These bifunctional modification at the microscopic level improved the electrochemical performance of the electrode and facilitated ion migration and adsorption. Poly(vinyl alcohol) (PVA) was used as a binder to further intensify the macroscopic hydrophilicity of the HTO/RGO-TA electrode. Lithium adsorption capacity of the modified electrode in 2 h reached 25.2 mg g–1, more than double that of HTO (12.0 mg g–1). The modified electrode showed excellent selectivity for Na+/Li+ and Mg2+/Li+ separation and good cycling stability. The adsorption mechanism follows ion exchange, which involves H+/Li+ exchange and Li–O bond formation in the [H] layer and [HTi2] layer of HTO.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xinyu Li,Fei Ye,Hui Zhang,Munir Ahmad,Zhenxing Zeng,Shuaijie Wang,Sufeng Wang,Dawei Gao,Qingrui Zhang
Integrating g-C 3 N 4 with narrow-band semiconductor to construct a Z-scheme structured heterojunction has been regarded as a common strategy to improve the photocatalytic performance of g-C 3 N 4 . However, limited catalytic activity increment is achieved due to the contradiction of expanding the light absorption scope of traditional photo-oxidation semiconductors (PS II) and preserving their valance band oxidative abilities. Herein, to extend the light absorption range of g-C 3 N 4 based Z-scheme photocatalyst to the whole solar spectra while without losing the high oxidative ability of this system, we select the heavy doped W 18 O 49 as PS II and provide a facile in situ hydrothermal method to elaborately fabricate an rGO decorated W 18 O 49 @g-C 3 N 4 (r-CNW) Z-scheme photocatalyst. The prepared r-CNW-2 (with optimal W 18 O 49 to g-C 3 N 4 weight ratio of 1:2) exhibits improved photocatalytic performance with H 2 O 2 generation rates of 71, 58.5 and 6.3 μmol g −1 h −1 obtained under the simulated solar light, visible light (>400 nm) and NIR light (>800 nm) irradiation, respectively, which is 1.3 and 2 times higher than those of the g-C 3 N 4 counterparts (54, 29 μmol g −1 h −1 and even not detected).such outstanding performance of r-CNW-2 could be associated with the broader light absorption, fast charge separation, and rapid redox reactions. Moreover, the r-CNW-2 also displays an excellent E-coli inactivation activity, comparable to most g-C 3 N 4 -based photocatalysts. Our work gives a new insight through trading off light absorption and redox ability to fabricate efficient Z-scheme photocatalyst for photocatalytic H 2 O 2 generation and environmental remediation.
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Light-Science & Applications
·
2023
·Vol. 12
·期 1
·1-10
·
IF 19.4
Gu Kai,Zhong Haizheng
Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy harvesting. As a fundamental property of materials, accurate measurement of light-to-heat conversion efficiency (LHCE) is of vital importance in developing advanced materials for photothermal applications. Herein, we report a photothermal and electrothermal equivalence (PEE) method to measure the LHCE of solid materials by simulating the laser heating process with electric heating process. The temperature evolution of samples during electric heating process was firstly measured, enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal equilibrium. The LHCE of samples can be calculated under laser heating with the consideration of heat dissipation coefficient. We further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements, supporting the obtained small error within 5% and excellent reproducibility. This method is versatile to measure the LHCE of inorganic nanocrystals, carbon-based materials and organic materials, indicating the applicability of a variety of materials.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 26
·8971-8981
·
IF 6.4
Zheng Yuan,Jun Yan,Feng Gao,Jue Cheng,Junying Zhang
It is a challenge to develop polyurea with high-performance and multifunctionality because the integration of functions often comes at the expense of mechanical properties. This work synthesized a novel diisocyanate with a pyrene side chain, followed by reacting with poly(propylene oxide) diamine to prepare polyurea elastomers (PPU-x). Herein, thanks to the strong π–π stacking effect between pyrene groups and the anchoring effect of the amino group, the maximum tensile strength of PPU-x reached 41.4 MPa. The large conjugate structure of pyrene groups also gave PPU-x outstanding fluorescence and UV shielding performance. More noteworthy is the fact that graphene can be well dispersed in PPU-x with such high polarity via π–π interactions, which caused the dielectric constant of graphene-modified PPU-x nanocomposites to be three times that of PPU-0.3. Furthermore, this nanocomposite was used to make a triboelectric nanogenerator. Under the action of 0.5 N, the output voltage can reach 80 V, which is expected to be used to monitor weak signals of the human body. This work opens up a new strategy for the development of high-performance polyurea and its graphene-modified multifunctional polyurea nanomaterials with wide potential applications.
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ChemSusChem
·
2023
·Vol. 16
·期 17
·e202300493
·
IF 8.4
Yong-Feng Shen,Meng-Meng Zhang,Dong Yan,Jia-He Lv,Tao Wu,Bin He,Wen-Cui Li
Graphical From petroleum coke : Soft carbon cathode with superb rate performance for dual-ion batteries is presented. In situ XRD and Raman show that PF 6 − anions form stage-1 graphite intercalation compounds in the surface region, and directly stage-2 in the bulk, skipping the conversion from stage-4 to stage-2 due to the benefit of surface effect. The improved reaction kinetics results in better rate performance than that of conventional graphite. Dual-ion battery is a new type of battery in which both anions and cations participate in the energy storage process. However, this unique battery configuration imposes high requirements on the cathode, which typically presents a poor rate performance due to the sluggish diffusion dynamics and intercalation reaction kinetics of anions. Herein, we report petroleum coke-based soft carbon as the cathode for dual-ion batteries, exhibiting a superior rate performance with a specific capacity of 96 mAh g −1 at a rate of 2 C and 72 mAh g −1 remained even at 50 C. In situ XRD and Raman demonstrate that the anions can directly form lower-stage graphite intercalation compounds during the charge process owing to the surface effect, skipping the long evolutionary process from higher to lower stage, thus significantly improving the rate performance. This study highlights the impact of the surface effect and provides a promising perspective for dual-ion batteries.
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ACS Applied Electronic Materials
·
2023
·
IF 4.7
Xintong Zhao,Wei Wu,Dietmar Drummer,Yi Wang,Sufei Cui,Chao Liu,Zijian Lu,Shuo Li,Qiming Chen
Thermal conductive composites have a wide application in the electronic packaging field, and fabricating three-dimensional (3D) graphene aerogels by the self-assembly method is a facile way to construct thermal conductive networks in polymer composites. But those self-assembled graphene aerogels can only endow composites with a limited thermal conductivity because (1) abundant defects on RGO sheets reduce their intrinsic thermal conductivity and (2) massive edges and gaps in aerogels cause severe phonon scattering. Many works before have been done to heal the defects by high-temperature annealing, but the works of filling gaps and decreasing phonon scattering are rare. Herein, we designed a facile route to synthesize SiC nanowires on the edges of RGO sheets for connecting adjacent RGO sheets, decreasing phonon scattering, and enhancing thermal conduction efficiency in graphene aerogels. Before that, RGO/Si aerogels with vertically aligned structures were obtained by the chemical reduction method and the freeze-drying method to enhance their through-plane thermal conduction efficiency. When the initial mass ratio of GO solute/silicon powder was 5:1, HGA-5 endowed the EP composite with a high through-plane thermal conductivity of 3.59 W m–1 K–1 at a relatively low filler loading of 2.87 wt %. Finite element analysis was applied to illustrate the thermal conductive mechanism of the hybrid aerogels-filled EP composites. The EMI shielding performance of the composites was also discussed in this work.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xueyu Wei,Saraschandra Naraginti,Xiaofan Yang,Xiaoping Xu,Jiyuan Li,Junwei Sun,Zhigang Liu,Jiang Pei
A superior semiconductor material with efficient charge separation and easy reuse could be a promising route for efficient photocatalytic hydrogen evolution and pollutant degradation . AgVO 3 is one of the best visible light active materials which has attracted much attention for several biological and environmental applications. In the aim of enhancing its stability and recyclability a novel AgVO 3 /rGO/CuFe 2 O 4 heterojunction was prepared by hydrothermal method for hydrogen generation (H 2 ) and 4-nitrophenol (4-NP) degradation as well. The composite was well characterized by XRD, SEM, HR-TEM, XPS and VSM. The morphological images suggested the rod shaped AgVO 3 and irregular shaped CuFe 2 O 4 are unevenly distributed on reduced graphene oxide (rGO) layers. The hydrogen evolution results indicated that the composite showed around 8.937 mmol g −1 h −1 of H 2 generation which was ∼2.3 times and ∼9.2 times higher than pure AgVO 3 (3.895 mmol g −1 h −1 ) and CuFe 2 O 4 (0.96 mmol g −1 h −1 ) respectively. The 4-NP degradation efficiency of the prepared composite was observed as 94.7% (k = 0.01841 min −1 ) which is much higher than the AgVO 3 (66.3%) and CuFe 2 O 4 (38.2%) after 4 h of irradiation. The higher efficiency could be attributed to the heterojunction formation and faster charge separation. The radical trapping results indicated that the •OH, O 2 •− and photogenerated h + are the main species responsible for efficient activity. The AgVO 3 /rGO/CuFe 2 O 4 heterojunction showed 49.6 emu/g of saturation magnetization and confirms that it could be easily separated with an external magnet, and showed 85.3% of degradation efficiency even after 6 recycles which indicated its higher stability and recyclability. Thus, our study provides new insight into hydrogen generation and phenol degradation using AgVO 3 based recyclable composites.
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RSC Advances
·
2023
·Vol. 13
·期 18
·12609-12617
·
IF 3.9
Tao Gong,Xiaoyu Wang,Huirui Zhu,Chaochao Wen,Qing Ma,Xiaoning Li,Meining Li,Rui Guo,Wenting Liang
The combination of chemo-photothermal therapy with high efficiency and fewer side effects has a good application prospect in cancer treatment. It is of great significance to construct a nano-drug delivery system with cancer cell targeting, high drug loading and excellent photothermal conversion efficiency. Therefore, a novel nano-drug carrier MGO-MDP–FA was successfully constructed by coating folic acid-grafted maltodextrin polymers (MDP–FA) on the surface of Fe3O4-modified graphene oxide (MGO). The nano-drug carrier combined the cancer cell targeting of FA and the magnetic targeting of MGO. A large amount of anti-cancer drug doxorubicin (DOX) was loaded by π–π interaction, hydrogen bond interaction and hydrophobic interaction, with the maximum loading amount and loading capacity of 657.9 mg g−1 and 39.68 wt%, respectively. Based on the excellent photothermal conversion efficiency of MGO, MGO-MDP–FA showed good thermal ablation effect of tumor cells in vitro under NIR irradiation. In addition, MGO-MDP–FA@DOX showed excellent chemo-photothermal synergistic tumor inhibition in vitro (tumor cell killing rate reached 80%). In conclusion, the novel nano-drug delivery system MGO-MDP–FA constructed in this paper provides a promising nano-platform for chemo-photothermal synergistic treatment of cancer.
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Plants-Basel
·
2023
·Vol. 12
·期 9
·1738
·
IF 4.5
Zixin Zhou,Jiaxin Li,Cui Li,Qiang Guo,Xincun Hou,Chunqiao Zhao,Yu Wang,Chuansheng Chen,Qinghai Wang
The extensive applications of graphene oxide (GO) inevitably lead to entry into the natural aquatic environment. However, information on its toxicity to emergent plants is still lacking. In this study, an emergent plant,Iris pseudacorus,was exposed to GO (1, 20, 80, and 140 mg·L−1) under hydroponic conditions for 15 weeks. Changes in plant growth were assessed by analyzing plant biomass and photosynthetic pigment contents; the photosynthesis response was verified by measuring chlorophyllafluorescence; and the nutrient levels of the plant were evaluated. Results showed that GO at 20–140 mg·L−1significantly increased plant dry weight by 37–84% and photosynthetic pigment contents by 26–178%, and 80 mg·L−1was the optimal concentration. PSII activity, adjustment capacities of electron transport in PSII, the grouping or energetic connectivity between PSII units, light energy conversion efficiency, photosynthesis performance indexes (by 11–51%), and contents of several nutrient elements (N, Fe, and Cu) were increased by 49–69%, 34–84%, and 11–38%, respectively. These findings indicate that GO can enhance plant growth by promoting plant photosynthesis performance and improving plant nutrient levels, and has great application potential in promoting the growth and development of this emergent plant as a phytoremediation agent.Keywords:aquatic plant;graphene oxide;photosynthesis;plant nutrients
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Small Methods
·
2023
·Vol. 7
·期 8
·2300054
·
IF 12.4
Lu Chen,Youbing Li,Kun Liang,Ke Chen,Mian Li,Shiyu Du,Zhifang Chai,Michael Naguib,Qing Huang
Two-dimensional (2D) transition metal carbides and/or nitrides, MXenes, are prepared by selective etching of the A-site atomically thin metal layers from their MAX phase precursors. High entropy MXenes, the most recent subfamily of MXenes, are in their infancy and have attracted great interest recently. They are currently synthesized mainly through wet chemical etching of Al-containing MAX phases, while various MAX phases with A-sites elements other than Al have not been explored. It is important to embody non-Al MAX phases as precursors for the high entropy MXenes synthesis to allow for new compositions. In this work, it is reported on the design and synthesis of Ga-containing medium/high entropy MAX phases and then their corresponding medium/high entropy MXenes. Gallium atomic layer etching is carried out using a Lewis acid molten salt (CuCl2). The as-prepared (Ti 1/4 V 1/4 Nb 1/4 Ta 1/4 ) 2 CT x exhibits a Li + specific capacity of ≈400 mAh g −1 . For (Ti 1/5 V 1/5 Nb 1/5 Ta 1/5 Mo 1/5 ) 2 CT x a specific capacity of 302 mAh g −1 is achieved after 300 cycles, and high cycling stability is observed at high current densities. This work is of great significance for expanding the family members of MXenes with tunable chemistries and structures.
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Molecular Catalysis
·
2023
·
IF 4.6
Junqiang Li,Weifeng Huang,Zhuoyue Wang,Xiao Xu,Miao Sun,Longtian Kang
The carbon-based materials with metal-N-C active sites have been widely studied on the electrocatalysis for carbon dioxide reduction reaction (CO 2 RR), however, they were investigated a few for the photocatalytic CO 2 RR. Here, cobalt phthalocyanine (CoPc) molecules with intrinsic Co-N 4 -C moiety are successfully dispersed on graphene oxide (GO) as the CO 2 RR photocatalyst. The morphology, structure, and component of CoPc/GO composites with the different ratio of GO to CoPc are systematically characterized, confirming the existence of Co-O-C axial coordination bond between CoPc and GO. The optical, photoelectric, and electrical properties of CoPc/GO composites are carefully investigated, indicating their synergistic role of CoPc and GO in photocatalysis. With the optimal CoPc/GO sample as photocatalyst, a ∼1500 μmol⋅g − 1 ⋅h − 1 evolution rate and ∼ 85% selectivity of CO and CH 4 can be achieved, which is much higher than those performances of CoPc. After the reduction of CoPc/GO to CoPc/rGO, the rate of CO 2 RR to CO and CH 4 is reduced to 916 μmol⋅g − 1 ⋅h − 1 , indicating the important role of Co-O-C axial bond in the CO 2 RR. This work provides a simple way to prepare the single-molecule catalyst for CO 2 RR.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·11001-11014
·
IF 3.3
Haiyang Fu,Bo Gao,Jiahao Li,Zhuang Liu,Qihao Yin,Zhongbao Feng,Ali Reza Kamali
Honeycomb graphene–polyaniline (HG–PANI) nanocomposites are synthesized through a facile electrostatic self-assembly approach, and the obtained material is characterized as the electrode for supercapacitor applications. HG–PANI comprises of fibrous polyaniline embedded within honeycomb graphene nanosheets, preventing the stacking of nanosheets and suppressing the volume expansion of polyaniline. In the nanocomposite, nitrogen (≈8 at%) exists in the form of quinonimine (N–), amine (–NH–) and positively charged nitrogen cation radical (N+), and the latter effectively enhances both the electronic conductivity of graphene and the surface activity of the electrode improving the capacitive performance of the nanocomposite. HG–PANI exhibits a mesoporous structure with an average pore size of 3.78 nm and a specific surface area of 40 m2 g−1 providing sufficient channels for the ion transport. The electrical conductivity of HG–PANI (80%) was measured to be 6289.31 S m−1, a 10-fold increase in electrical conductivity over the unmodified material HG. The specific capacitance of the material is measured to be 736.2 F g−1 at a current density of 0.5 A g−1, 81.6% higher than that of HG without the involvement of PANI. This article reports on the simple, scalable and low-cost preparation of a honeycomb graphene–polyaniline nanocomposite, and its supercapacitor application.
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