POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6269
·
IF 3.1
Mirza Nadeem Ahmad,Muhammad Naveed Anjum,Muhammad Fayyaz Farid,Atta-ul Haq,Akbar Ali,Muhammad Fayyazur Rehman,Mohammed A. Assiri,Muhammad Safwan Akram
Water pollution is growing at an alarming rate, particularly due to the colored wastewater released by the various industries into aquifers and fresh water sources, and in some extreme cases, they have reached the water table. Faisalabad, a city in Pakistan where there is an industrial cluster of textiles dyeing and manufacturers, water table has become undrinkable. The presence of hazardous dyes and chemicals imposes serious health issues on humans, animals, and plants. The treatment of such toxic dye effluents is crucial and could be done by efficient degradation methods such as photocatalysis. The current study presents synthesis of poly( o -methylaniline)/zinc oxide/reduced graphene oxide nanocomposite (POMA/ZnO/rGO NC) using a chemical oxidative polymerization process and explores its properties as a photocatalyst by demonstrating degradation of three dyes. The composite was characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), photoluminescence emission spectroscopy (PL), Brunauer Emmett–Teller analysis (BET), and UV–visible spectroscopy (UV–visible). Further, the photocatalytic activity of POMA/ZnO/rGO NC was evaluated and compared by degrading the direct yellow 12 (DY 12), congo red (CR), and malachite green (MG) dyes in aqueous media under UV irradiation. The results indicated that after 110 min, POMA/ZnO/rGO composite degraded the dyes by 92% (DY 12), 86.1% (CR), and 82.1% (MG), respectively. Moreover, kinetic studies of the photocatalyst were also performed along with reusability test, total organic carbon, chemical oxygen demand, and degradation mechanism.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Wei Zeng,Sili luo,Da Rong,Yanlong Li,Yunying Fei,Meng Zhao,Linsheng Huang
A highly sensitive electrochemical sensor based on a composite of two-dimensional (2D) reduced graphene oxide (rGO) and three-dimensional (3D) zeolitic imidazolate framework-8 (ZIF-8) for detecting the NH4+ ion is reported. The ZIF-8/rGO composite electrode is in situ grown to be anchored on the Si/Ag substrate. Here, the rGO layer has high conductivity, while ZIF-8 has a large specific surface area, which provides a large number of active sites. This structure significantly increases the electrical conductivity and enhances the electrochemical performance. With a differential pulse voltammetry measurement at the pH value of 7.00, the multidimensional composite electrode with the optimal ZIF-8 structure exhibits a sensitivity of 9.30 μA μM–1, and a detection range of 5–50 μM with a low detection limit of 3.00 × 10–9 M, as well as high repeatability, stability, and selectivity. These results might be due to the oxidation reaction of NH4+ with the ZIF-8 framework and the special 2D–3D electron transfer channel formed by the composite.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wen-Bei Yu,Heng-Rui Zhang,Hong-Wei Zhang,Yao Liu,Yu Li,Bao-Lian Su
Carbon materials are commonly integrated with TiO 2 to achieve high carrier mobility and excellent photocatalytic performance, and the chemical bond between TiO 2 − C is considered as a significant strategy to enhance efficiency. Nevertheless, few analyses have elucidated the formation mechanism of Ti 3 + − C bonds and the underlying reasons for the performance enhancement. To address these issues, this study conducts an in-depth investigation into the electronic structure of TiO 2 − C and demonstrates that the charge in the nonbonding molecular orbital t 2 g of Ti 3 + is transferred to the unoccupied 2 p energy level of C through the formation of 1π and 2π bonds, i.e., (Ti 3 d xz - C 2 p y ) and (Ti 3 d xy - C 2 p x ). The hybridization of t 2 g -2 p orbitals endows the Ti 3 + − C bond with higher carrier mobility and a stronger binding force, thereby contributing to stable photocatalytic H 2 production. Inspired by this scenario, the NSTiO 2 /rGO hybrid architecture, featuring the {101}/{001} surface heterojunction and the Ti 3 + − C interfacial chemical bond, has been constructed. As a result, the hybrid catalyst exhibited excellent photocatalytic cycling stability of 92.9 % $92.9 \,\%$ and an H 2 evolution rate of 33.4 mmolh −1 g −1 . This work proposes a strategy for designing efficient photocatalyst by regulating orbitals to achieve high-performance photocatalytic methanol splitting.
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Water
·
2024
·Vol. 16
·期 14
·2026
·
IF 3
Yang Gu,Chengjun Qiu,Wei Qu,Wei Tao,Zizi Zhao,Huili Hao
Cadmium (Cd) and zinc (Zn) in seawater enter the human body through the food chain. Combined toxicity tests indicated that high concentrations of Cd(II) and low concentrations of Zn(II) had a synergistic effect on humans. Thus, there is an urgent need to prepare a sensor for rapid and simultaneous detection of Cd(II) and Zn(II) in seawater. Herein, a reduced graphene oxide/carboxylated multi-walled carbon nanotube (rGO/MWCNT-COOH)-modified glassy carbon electrode was prepared in the experiments using the dropping method. The synthesis of various materials achieved the purpose of expanding the surface area, and scanning electron microscopy was used to observe the structure of the composite membrane. Moreover, the large number of functional groups on the surface of the composite membrane can also increase the adsorption of ions. For the determination of trace cadmium (II) and zinc (II) in seawater, the method used was differential pulse voltammetry (DPV). The results show that the peak current, which was obtained in the range of 5–400 μg/L for Cd(II) and Zn(II), has a linear relationship with concentration, corresponding to the detection limits of 0.8 μg/L for Cd(II) and 0.98 μg/L for Zn(II). The modified electrode was used to determine the Cd(II) and Zn(II) content in the coastal seawater of the Maowei Sea, and the recovery rate was between 95.8 and 98.2% for Cd(II) and 96.7~99.4% for Zn(II), which provided a novel approach of detection to define trace Cd(II) and Zn(II) in seawater.
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TALANTA
·
2020
·
IF 5.339
Bo Yin,Rui Rui Liu,Hong Lin Zhai,Shao Hua Lu,Jia Ying Mi
A simple and facile one-pot approach for the synthesis of copper nanoclusters decorated reduced graphene oxide (CuNCs/RGO) nanocomposite was proposed, in which the CuNCs attached to the surface of the reduced glutathione (GSH) functionalized RGO through ligand exchange via their thiol functionalities. The synthesized nanocomposite was verified by structural characterizations, and the further investigation of density functional theory (DFT) indicated that Cu 3 R 2 cluster (R = C 10 H 16 O 6 N 3 S) with the lowest energy was the most stable structure in GSH-capped CuNCs. Although the CuNCs/RGO nanocomposite exhibited rather weak fluorescence, with the addition of heparin (Hep), the significant enhancement of fluorescence at 595 nm was achieved, which was developed to detect Hep in human serum samples with high selectivity and sensitivity. The mechanisms of fluorescence quenching of CuNCs/RGO nanocomposite and the sensing of Hep were discussed. The linear range was 0.1–10 μM with the detection limit of 26 nM in buffer solution containing 2% human serum sample, and satisfactory recovery in the range of 96.6%–104% was obtained, suggesting that the proposed method could applied to the detection of Hep in human serum samples.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Hongyuan Li,Hongli Zhao,Zhenxing Wang,Fangfang Zhou,Minbo Lan
Hydrogen peroxide (H 2 O 2 ) is an important biomarker for recognition of multiple diseases, the construction of nonenzymatic miniaturized sensors that capable to real-time monitor H 2 O 2 is tremendously significant. Here, we developed a high-performance microelectrode based on carbon fiber via a facile stepwise electrodeposition method, which could realize the high-sensitivity detection of the target H 2 O 2 . Carbon fiber was decorated by reduced graphene oxide supported PtCu bimetallic cluster nanocomposite (PtCu-rGO), in which rGO as catalyst support had a thin layer, which could realize the uniform loading of the other material. Meanwhile, in virtue of the low cost and synergistic effect, PtCu bimetallic cluster nanoparticles exhibited great potential in electrocatalytic of H 2 O 2 . The PtCu-rGO modified microelectrode displayed outstanding electrochemical behavior to H 2 O 2 sensing, including a broad working range of 5 μM-1270 μM (R 2 = 0.991), 1270 μM-3920 μM (R 2 = 0.998) with high sensitivity (15079.9 μA mM -1 cm −2 , 5–1270 μM; 10319.8 μA mM −1 cm −2 , 1270–3920 μM), an appreciable detection limit of 0.60 μM, as well as good selectivity, reproducibility and stability. Additionally, this easy-to-interpret sensor enabled real-time monitoring of H 2 O 2 generated from living cells and could further recognize cancer cells and normal cells. This newly proposed microsensor could be a promising tool for clinic diagnosis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wenyan Huang,Zhichao Xue,Lingjie Li,Shengjian Mao,Yufeng Wang,Yeqi Zhu,Tao Luo,Qianwen Tao,Rongqian Yao
Strengthening interface bonding for superior mechanical/ablation performances of SiC-based aerospace vehicle components remains a major challenge. Attractively, polycarbosilane-vinyltriethoxysilane-graphene oxide with addition of TiN/B (PVG(TiN, B)) were successfully synthesized for the first time. An ingenious route via re-pyrolyzing ball-milling-induced SiC(rGO, TiB 2 ) p fillers/PVG(TiN, B) precursors blends was introduced to prepare lightweight SiC(rGO, TiB 2 ) composite polymer-derived ceramics (PDCs). Interestingly, both SiC(rGO, TiB 2 ) p and PVG(TiN, B) pyrolysis products, composed of β-SiC/SiO x C y /C free (rGO, TiB 2 ), are tightly coupled by each other owing to plentiful Si-dangling bonds. In-situ formed intergranular TiB 2 /B 4 C, well compatible with amorphous ceramic network, can prevent β-SiC grain growth, strengthen interface bonding, and even hinder further crack propagation along the grain boundaries. Particularly, samples re-pyrolyzed at 1300 °C possess unique combination of good hardness (5.44 GPa), excellent fracture toughness (4.70 MPa·m 1/2 ), high flexural strength (41.90 MPa) and outstanding compressive strength (126.33 MPa). Improved high-temperature and ablation resistance gives them distinct advantages of interlocked microstructure under exposure of butane flame. As demonstrated, SiC(rGO, TiB 2 ) composite PDCs were developed into porous ceramics with good thermal insulation , focusing on manufacturing large-size bulk PDCs for thermal protection system of hypersonic vehicles.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Fuling Li,Changgeng Li,Quan Xie,Xuelong Chen,Xiu-Zhi Tang,Tong Guo
Elegant material construction to realize high-efficiency microwave absorption with low filler loading is in strong demand yet remains challenging. Here we combine a self-assembly method followed by pyrolysis to fabricate core-shell Co 9 S 8 @MoS 2 nanocubes, which were uniformly anchored on reduced graphene oxide nanosheets (A-G/Co 9 S 8 @MoS 2 ) to form hierarchical heterostructures . The heterostructure was deliberately designated via chemical etching of in situ formed Co 9 S 8 derived from ZIF-67 and decoration of flower-like MoS 2 nanosheets. Owing to its synergic effect in compositions and well-designed heterostructure, the product A-G/Co 9 S 8 @MoS 2 exhibits excellent microwave absorption performance with low loading content. A minimum reflection loss of − 55.13 dB and effective absorption bandwidth of 6.61 GHz with filler loading of only 8 wt% was achieved, contributed by the good impedance matching and dual loss mechanism. This work provides a new pathway for designing low-filler loading high-performance microwave absorption materials.
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高影响因子
Current Analytical Chemistry
·
2020
·Vol. 16
·期 8
·1063-1070
·
IF 1.365
Zhang Lin,Si Xiaojing,Yan Xiaoxia,He Haibo,Deng Dongmei,Luo Liqiang
Background: Paracetamol is a common antipyretic and analgesic drug, but its excessive intake can accumulate toxic metabolites and cause kidney and liver damage, so it is critical to determine the content of paracetamol for clinical diagnosis and dose use. Methods: Au-reduced graphene
oxide (Au-rGO) nanocomposite decorated with poly(L-cysteine) on carbon paste electrode was fabricated for the determination of paracetamol. Au-rGO was first coelectrodeposited on the carbon paste electrode surface. Afterwards, L-cysteine was electropolymerized to fabricate the Au-rGO/poly(L-cysteine)
modified carbon paste electrode. Scanning electron microscope was used to characterize the morphology of Au-rGO and poly(L-cysteine)/Au-rGO. The electrochemical properties of the sensor were studied by cyclic voltammetry and differential pulse voltammetry. Results: After exploring the
optimal conditions, the sensor showed a wide linear response for paracetamol detection in the range of 1-200 μM with a detection limit of 0.5 μM (S/N = 3). Conclusion: The fabricated sensor demonstrated good sensitivity with rapid detection capacity in real samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Longjie Liu,Jiajiang Lin,Gary Owens,Zuliang Chen
Wastewater from sewage treatment plants containing 17α-estradiol (αE 2 ) has a high potential to cause environmental and human toxicity. Integration of adsorption and Fenton-like oxidation is one of the potential approaches to enhance αE 2 removal. In this study, one-step biosynthesized iron nanoparticles/reduced graphene oxide (FeNPs/rGO) by tea extract was successfully used for αE 2 removal. The results showed that the removal of αE 2 by FeNPs/rGO increased to 56.1%, being only 25.4% and 45.4% for rGO and FeNPs, respectively, indicating that both adsorption and Fenton-like oxidation enhanced the removal of αE 2 , where was confirmed by HPLC-UV. To understand the removal mechanism, characterizations, including ESR, SEM, EDS, FTIR and XPS were used to elucidate the specific roles of rGO and FeNPs in the adsorption and oxidation of αE 2 , and results showed that αE 2 was adsorbed as a monolayer on the surface of rGO via π–π bond interactions and that FeNPs underwent reactions with H 2 O 2 to generate ·OH for αE 2 degradation. Thereafter, a αE 2 degradation pathway was proposed via identification of degradation products (e.g., C 18 H 22 O 3 ) by HPLC-MS. Moreover, the removal of αE 2 by FeNPs/rGO conformed to the Langmuir isotherm with pseudo-first-order adsorption kinetics and pseudo-second-order degradation kinetics. Based on these evidences, the removal of αE 2 by FeNPs/rGO was presented.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 10
·7799-7810
·
IF 2.779
Viswanathan Munusami,Arutselvan K.,Vadivel S.,Govindasamy S.
As a two-dimensional nanostructure, reduced graphene oxide (RGO) has high specific surface area and excellent conductivity. In this report, we obtain the BaSnO 3 /RGO via facile hydrothermal method and apply it as a photoanode material in dye-sensitized solar cells. A facile hydrothermal method is used to describe the synthesis of RGO hybridization of BaSnO 3 perovskite-type oxide nanopowder and its use as a photoanode replacement in dye-sensitized solar cells. Strutural, morphological, elemental composition and optical properties of the prepared samples were analyzed by X-ray diffraction, Raman, scanning electron microscope, energy dispersive spectra, transmission electron microscope, UV-Vis spectra, photoluminescence and X-ray photoelectron spectra analysis. RGO in the BaSnO 3 photoanode can inhibit charge recombination and thus improve the power conversion efficiency (PCE) of the DSSC. Moreover, the layered structure RGO increases the dye absorption in the BaSnO 3 photoanode and the light harvesting efficiency. As a result, JSC and PCE based on BaSnO 3 /RGO photoanode have considerably increased from 8.45 to 19.51 mA cm −2 , 3.41% to 9.88%. Based on the findings, BaSnO 3 /RGO photoanodes under easily reproducible scientific/rational approach will facilitate an astonishing possibility to enhancing the PCE which confidently reinforce the probability of implementation in practical life and is indispensable for balancing the future non-renewable energy dearth.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Yang Bai,Yufei Yuan,Luyang Miao,Changli Lü
Anion exchange membranes (AEMs) still remains a povital issue such as low ion conductivity, which hinders the practical applications. Therefore, constructing cross-linking structure in AEMs is considered as an effective strategy to balance the comprehensive properties including chemical stability and ion conductivity. However, the cross-linking may hinder the ion transport and decrease the ion conductivity unsatisfactorily. Herein we prepared highly ion conductive quaternized polysulfone (QPSU)-based AEMs (CQPSU-X-rGO) cross-linked by reduced graphene oxide (rGO) functionalized with different-chain length small molecules. The cross-linked QPSU AEMs (CQPSU-n) with organic small molecules as cross-linkers were also prepared to serve as control samples. Compared with AEMs cross-linked by short-chain cross-linkers, the cross-linked membranes with elastic long-chain cross-linkers (PTMHDA) and their modified rGO (LrGO) displayed higher ion conductivity due to the generation of more quaternary ammonium groups and nanophase separated morphology. Especially, the functionalized rGO-cross-linked composite membranes (CQPSU-X-LrGO and CQPSU-X-SrGO) exhibited better conductivity and chemical stability as compared with cross-linked polymer membranes (t-CQPSU-n and p-CQPSU-n) with small molecule cross-linkers. The highest ion conductivity was achieved for rGO-cross-linked AEMs (CQPSU-2%-LrGO, σ OH - = 139.7 mS/cm at 80 °C). Thus, the functionalized rGO has been demonstrated to be a potential cross-linker and filler for preparing cross-linked AEMs with improved properties.
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高影响因子
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