Frontiers in Chemistry
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2022
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IF 5.545
Lu Xin-Yang,Li Jing,Kong Fen-Ying,Wei Mei-Jie,Zhang Pei,Li Ying,Fang Hai-Lin,Wang Wei
An electrochemical sensor for sensitive sensing of acyclovir (ACV) was designed by using the reduced graphene oxide–TiO2–Au nanocomposite-modified glassy carbon electrode (rGO–TiO2–Au/GCE). Transmission electron microscopy, X-ray diffractometer, and X-ray photoelectron spectroscopy were used to confirm morphology, structure, and composition properties of the rGO–TiO2–Au nanocomposites. Cyclic voltammetry and linear sweep voltammetry were used to demonstrate the analytical performance of the rGO–TiO2–Au/GCE for ACV. As a result, rGO–TiO2–Au/GCE exerted the best response for the oxidation of ACV under the pH of 6.0 PB solution, accumulation time of 80 s at open-circuit, and modifier amount of 7 µl. The oxidation peak currents of ACV increased linearly with its concentration in the range of 1–100 µM, and the detection limit was calculated to be 0.3 µM (S/N = 3). The determination of ACV concentrations in tablet samples also demonstrated satisfactory results.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Shiliang Chen,Shuoshuo Lei,Binbin Wu,Weiping Yang
The fundamental mechanistic understanding of the working principle of metal phthalocyanine (MPc) + H 2 O 2 system, at molecular level, is in its nascent stage. In this paper, a green strategy was employed for the immobilization of sulfonated cobalt phthalocyanine (CoPc) onto reduced graphene with assistance of bio-synthesized nanocellulose , and the resulting graphene-supported-CoPc (CoPc&G) was applied for the catalytic degradation of phenol solution with H 2 O 2 as oxidant. More than 90% of phenol can be removed within 75 min, and the existence of graphene clearly has a positive effect on the catalytic activity. Theoretical calculations were conducted to unveil the catalytic nature of CoPc&G. H 2 O 2 was favorably chemisorbed onto CoPc&G in the form of OOH − , hydroxyl radicals were favorably formed by homolytic cleavage of O O bonds, and ΔG value for the formation of reactive species was decreased with the existence of graphene. Density of states (DOS) analysis shows that graphene could effectively boost the electronic activity, reduce HOMO-LUMO gap, and strengthen the polarizability of the catalyst, thereby lower the free energy gap for the enhanced generation of reactive species. A detailed catalytic degradation route of phenol with CoPc&G + H 2 O 2 system was established based on the combination of theoretical calculations and experimental results.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Ning Zhang,Xiaofeng Ning,Jia Chen,Jianming Xue,Gongxuan Lu,Hongdeng Qiu
The development of TiO 2 -based composites with a broad light response and outstanding photocatalytic performance is very important for the removal of antibiotics. In this work, we prepared a series of new porous graphene (PG)/TiO 2 nanocomposites formed the different highly reactive interface within confined space via a partial combustion strategy using TiCl 4 as the Ti source. The as-prepared PG/TiO 2 exhibited the simultaneous effect of incredible adsorptivity and photodegradation performance toward tetracycline (TC) antibiotic under UV and visible light in contrast to conventional PG/TiO 2 , pure TiO 2 (P25) and PG. Optimization experiments showed that PG/TiO 2 -4% had the optimal removal performance among all the nanocomposites. The removal rate of TC reached up to 95.5%, which was 15% higher than that of I-PG/TiO 2 and 25% higher than that of P25 within 90 min. The results were credited to (1) the high specific surface area and porous structure of PG, (2) the broad light response range and rapid separation of h + and e − of PG/TiO 2 , and (3) the highly reactive interface between PG and TiO 2 nanoparticles . In addition, active radical trapping experiments indicated that ·O 2 − was crucial to the elimination of TC. This work showed the new potential of PG/TiO 2 nanocomposites for the enhanced photocatalytic performance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jingxin Zhou,Ran Wang,Weiwei Su,Lexin Zhang,Adan Li,Tifeng Jiao
Diabetes is one of the global chronic diseases, which is mainly caused by the abnormal increase of blood sugar level. Therefore, it is particularly important to monitor glucose in real time. In this work, based on the principle that phenylboronic acid can react with diol rapidly and reversibly in aqueous medium, phenylboronic acid functionalized reduced graphene oxide (rGO-PBA) and polyhydroxy modified carbon spot fluorescent probe (CD1) were designed for detecting important glucose molecules. Among them, reduced graphene oxide (rGO) has high specific surface area and strong fluorescence quenching performance. When CD1 is close to the surface of rGO-PBA, the fluorescence of carbon dots was quenched. With the addition of glucose, the fluorescence of carbon dots increased continuously. The detection of small molecule glucose can be realized quickly and sensitively by using the "on" and "off" strategies of fluorescence.
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Surface Topography-Metrology and Properties
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2022
·Vol. 10
·期 1
·015039
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IF 2.185
Xiaolin Li,Gang Kong,Jingwen Zhang,Delin Lai,Chunshan Che,Bo Yang,Shuanghong Zhang,Jiayu Gu
Conductive metals can speed up the self-assembly and reduction process of graphene oxide (GO) in liquid media, but there is little available information about the effect of this process on the corrosion rate of metal substrates. The corrosion performance of Q235 steel in GO aqueous solution was studied by comparing the influence of different GO concentrations and immersion times on the corrosion rate of steel. The result found that a GO layer will be formed on the surface of steel when immersing in the GO aqueous dispersion, which has a shielding effect on the diffusion process of ions and electrons, and effectively inhibits the steel corrosion. However, this inhibition effect of GO layer will disappear with the self-reduction of GO, which increasing the defect density and conductivity of the sedimentary layer on steel and thus the corrosion rate of steel will increase with the immersion time and the GO concentration in solution.
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Materials Today Chemistry
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2022
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IF 7.613
Zahra Ansarian,Alireza Khataee,Samira Arefi-Oskoui,Yasin Orooji,Hongjun Lin
Herein, Ti 3 GeC 2 MAX phase was synthesized using the reactive sintering method and characterized via various techniques. The X-ray diffraction pattern confirmed the successful synthesis of the MAX phase in the hexagonal crystal structure with high purity. Based on the field-emission scanning electron microscopy and high-resolution transmission electron microscopy analysis, layered morphology with the compacted structure was observed. The catalytic activity of the MAX phase was evaluated for activation of peroxydisulfate (PDS) under ultrasound (US) irradiation. Ti 3 GeC 2 MAX phase (0.2 g/L) with a bandgap of 1.72 eV demonstrated high capability to activate 0.15 mmol/L of PDS under US irradiation, resulting in 94.7% removal efficiency within 80 min of reaction time. The removal of diverse types of pollutants such as dimethyl phthalate, hydroxychloroquine, and mefenamic acid confirmed the high performance of the Ti 3 GeC 2 /PDS/US ternary system. The quenching tests indicated that both radical and non-radical pathways are involved in the degradation process, and O 2 • − , O • H , S O 4 • − , and O 2 1 were recognized as critical species. In addition, a probable degradation mechanism was proposed. The results provide a promising perspective for the application of MAX phase-based materials in the ternary catalyst/oxidant/US systems for the efficient treatment of organic contaminants. To the best of our knowledge, the present work is the first effort to make use of the Ti 3 GeC 2 MAX phase as a desirable catalyst for the removal of organic pollutants applying the catalyst/PDS/US ternary system.
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RSC Advances
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2022
·Vol. 12
·期 13
·7950-7960
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IF 4.036
Chuanxiang Zhang,Xiqiang Li,Lingling Ding,Chen Jin,Haijun Tao
Perovskite solar cells (PSCs) are considered to be ideal energy devices, where perovskite-type organic metal halides act as light-absorbing materials. In PSCs, the photoexcitons are extracted and separated to afford high photoelectric conversion efficiency under the action of the built-in electric field (Ebi). However, the current challenge is that a low Ebi cannot provide a sufficient driving force to separate photonic excitons, which causes the captured charges to escape from the deep energy-level defect state. Here, the ferroelectric material barium titanate (BaTiO3) was directly introduced into the perovskite precursor solution to reduce the defection density (to 8.58 × 1017 cm−3) in PSCs and promote the separation of photoexcitons. Furthermore, the addition of BaTiO3 improved the quality of the perovskite film and significantly increased the photoelectric performance after the polarization treatment. This is mainly attributed to the residual polarization electric field generated by ferroelectric polarization, which increased the Ebi of the PSCs and the width of the depletion layer and inhibited the non-radiative recombination of carriers. This work provides a possibility to design and develop optoelectronic devices with high-efficiency optoelectronic response behavior.
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Materials Today Nano
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2022
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IF 13.364
J. Wu,P. Wu,X. Weng,J. Lin,G. Owens,Z. Chen
Recently, the green synthesis of iron nanoparticles and associated hybrids using plant extracts has attracted much attention due to its low cost, simplicity and environmental friendliness . However, the exact formation mechanism is still unclear. In this study, the one step green synthesis of hybrid rGO/Fe NPs by a tea extract was examined using a response surface methodology (RSM) to obtain a high activity of rGO/Fe NPs. The results showed that the best conditions for synthesis were an extract concentration = 35 g/L, pH = 7, and temperature = 30 °C. The optimized hybrid produced could remove 99.9% of mitoxantrone (MTX) compared to only 78.9% when unoptimized. To better understand the formation process, characterizations by SEM , TEM, AFM , FTIR, XRD , Raman, and XPS were performed. Theses characterizations showed that the Fe NPs produced had a particle size of 25 nm which were deposited randomly across the rGO nanosheet with a thickness of approximately 1.5 nm, indicating that stable hybrid rGO/Fe NPs were successfully synthesized, where the green tea extract exhibited both reducing and capping/stabilizing behavior. Furthermore, the specific biomolecules in the green tea extract responsible for bio-reduction and stabilization were identified by GC-MS and LC-MS, which showed that catechins were the main reducing agents, while alkaloids, amino acids and phenolic acids were the main capping/stabilizing agents. Finally, a mechanism for synthesizing rGO/Fe NPs was proposed, where the polyphenols successfully reduced GO and complexed with iron ions to form amorphous ferric (and ferrous) polyphenol complex nanoparticles.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Chongbin Wang,Yongsheng Li,Hongchao Wang,Yiyu Wang,Xiaoyu Chen,Chengze Li,Mengfei Sun,Jianxin Chen
Nanofiltration membranes prepared via polyamide crosslinked Graphene oxide (GO) sheets have been considered to be promisingly applied in water purification. Unfortunately, the water flux of polyamide crosslinked GO-based membranes is strongly restricted due to the small interlamellar spacing of GO sheets. To solve this problem, the microporous polymer networks (MPNs) and GO sheets were introduced into the polyamide layer to reach a synergistic effect in this work. Specifically, the interlamellar interaction of GO sheets was manipulated via intercalating MPNs nanoparticles. The synergistic effect of GO and MPNs was significantly beneficial for the improvement of water flux. A delicate wrinkled membrane surface was formed via regulating the content of MPNs nanoparticles, which could provide larger area in contact with water molecules, further improved the water flux. The prepared membrane with 1 g/m 2 MPNs and 41.8 mg/m 2 GO sheets gave an evidently increased water flux from 6.6 L m −2 h −1 bar −1 to 25.1 L m −2 h −1 bar −1 compared with the GO-based membrane without MPNs. Additionally, a high Na 2 SO 4 retention of 94% and considerable efficiency in anti-fouling property were also observed for the prepared membranes.
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ELECTROCHIMICA ACTA
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2022
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IF 7.336
Sijie Gao,Shuozhen Hu,Guoming Luo,Shigang Sun,Xinsheng Zhang
Doping nitrogen (N) into the carbon support was widely applied to enhance the performance of Pd toward formic acid electro-oxidation (FAO). However, traditional nitrogen doping methods can only introduce a low content of nitrogen as well as a two-step complicated procedure to synthesize catalysts. In this study, a facile one-pot strategy is demonstrated to prepare N-doped carbon encapsulated palladium nanoparticles (Pd@N x C) via the pyrolysis of 2,2′-bipyridine palladium (II) complexes. A N-doped carbon layer with the thickness of about 4 nm is in-situ generated over Pd nanoparticles by only one pyrolysis procedure. Both XPS and in-situ XRD results suggest that metallic Pd is reduced from Pd 2+ by the complexed N in bipyridine during the pyrolysis at high temperature. The physical characterizations prove that the in-situ formation of N-doped carbon shell can not only effectively prevent the agglomeration or dissolution of Pd nanoparticles, but also promote the charge donation from the carbon layer to Pd, and maintain the structure of Pd atom complexed to two pyridinic-N atoms (Pd-N). This in-situ synthesis strategy can be successfully applied to carbon supports with different geometry, such as reduced graphene oxide and Vulcan XC-72. Pd@N 3 C/rGO, which contains the highest amount of N (7.39 at.%) and Pd-N (33.15%), shows the highest specific activity (5.88 mA cm −2 ) and excellent durability toward FAO.
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Nanomaterials
·
2022
·Vol. 12
·期 4
·620
·
IF 5.719
Jun Zhou,Yuying Zheng,Dongyang Chen
The self-restacking of graphene nanosheets inevitably compromises the electrochemical performance of conventional graphene-based materials. Herein, to solve this problem, we prepared a new type of three-dimensional porous aerogel with partially unzipped multiwalled carbon nanotubes inserted into graphene nanosheets via a reduction-reaction-induced self-assembly process. In the resulting aerogels, the inner carbon nanotubes (CNTs) tightly attach to the unzipped outer graphene nanoribbons (GNRs), which bridge with the graphene nanosheets. These interconnections bring them excellent electrical contact; the CNTs act as spacers to prevent the restacking of adjacent graphene nanosheets, and the abundant interconnected pores in the aerogels provide large channels for charge transfer. Accordingly, the aerogels exhibit a specific capacitance of 348.4 Fg−1at a scan rate of 5 mVs−1, with capacitance retention remaining at 89.7% at a current density of 2 Ag−1after 5000 cycles. The results show that the aerogels are promising electrode materials for supercapacitor applications.Keywords:supercapacitor;aerogel;graphene;carbon nanotubes;nanoribbons
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MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Xiufen Han,Xiaohui Zhang,Lijuan Zhong,Xiao Yu,Haiyun Zhai
Novel sulfamethoxazole molecularly imprinted polymers based on magnetic metal–organic frameworks/graphene oxide composites (MOF/MGO@MIP) were synthesized using the surface molecular imprinting technique. The scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and other characterization methods were used to analyze MOF/MGO@MIP. The adsorption performance of MOF/MGO@MIP was studied via adsorption kinetics, adsorption isotherms and selectivity experiments, and then its adsorption mechanism was investigated using various adsorption models. The adsorption results matched well with a quasi-second-order kinetic model and a Langmuir isotherm model, with the maximum adsorption capacity, equilibrium adsorption time and imprinting factor of 42.65 mg g −1 , 120 min and 1.61, respectively. Meanwhile, the MOF/MGO@MIP with excellent recyclability displayed higher adsorption capacity and selectivity than MOF/MGO@NIP. Under the optimal extraction conditions, a method base on MOF/MGO@MIP combined with high-performance liquid chromatography (MOF/MGO@MIP/HPLC-UV) was established to separate and detect trace sulfonamides in honey and milk samples, achieving lower limits of detection (LOD, 0.39–0.47 μg kg −1 ) with an excellent linear correlation (R 2 > 0.9990). The spiked recovery and relative standard deviation (RSD) were 81.38–96.71% and 1.4–6.3%, respectively. Therefore, MOF/MGO@MIP could be regarded as an efficient adsorbent for SAs pretreatment in food samples.
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