CHEMOSPHERE
·
2023
·
IF 8.8
Huanxin Zhao,Yu Cao,Yuqi Liu,He Wang,Huixin Yu
A high-performance, durable, low-cost, and environmentally friendly catalyst is highly desired in advanced oxidation processes (AOPs) for water treatment . Considering the activity of Mn(Ⅲ) and the superior catalytic properties of reduced graphene oxide (rGO) in peroxymonosulfate (PMS) activation, rGO-modified MnOOH nanowires (MnOOH-rGO) were fabricated by a hydrothermal method for phenol degradation. The results showed that the composite synthesized at 120 °C with 1 wt% rGO dopant exhibited the best performance for phenol degradation. Nearly 100% of the phenol was removed by MnOOH-rGO within 30 min, which is higher than the removal rate of pure MnOOH (70%). The effects of catalyst dosages, PMS concentration, pH, temperature, and anions (Cl − , NO 3 − , HPO 4 2− and HCO 3 − ) on phenol degradation were investigated. The removal rate of chemical oxygen demand (COD) reached 26.4%, with a low molar ratio of PMS to phenol at 5:1 and a high PMS utilization efficiency (PUE) of 88.8%. The phenol removal rate remained more than 90% after five recycle with less than 0.1 mg L −1 leakage of manganese ions . Together with the results of radical quenching experiments, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance spectroscopy (EPR), electron transfer and 1 O 2 were proved to dominate the activation process. During the direct electrons transfer process, the electrons transfer from the phenol to PMS by using the Mn(Ⅲ) as the mediate with a stoichiometric ratio between PMS and phenol at 1:2, which mainly contributed to the high PUE. This work provides new insight into a high-performance Mn(Ⅲ) based catalyst on PMS activation with high PUE, good reusability, and environmentally friendly for removing organic pollutants.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xinmeng Zhang,Xin Wen,Jiahan Yang,Ji Li,Yuanting Wu
The Globe Thistles-Like (GTL) NiCo 2 S 4 nanostructures were supported on reduced graphene oxide modified filter paper (FP). The prepared GTL NiCo 2 S 4 /rGO/FP is investigated as a disposable and flexible electrode for the electrochemical detection of H 2 O 2 in alkaline media. Owing to the rich redox active sites, the synergistic effect between Co 3+ and Ni 2+ , and the rapid electron transportation of substituting sulfur (S) for oxygen (O) in NiCo 2 O 4 , the GTL NiCo 2 S 4 /rGO/FP exhibits considerable enzyme-free H 2 O 2 sensing performance with wide linear H 2 O 2 ranging from 38.8 to 37306.8 μM, high sensitivity of 2.4326 mA mM −1 cm −2 , and low detection limit of 0.08 μM. The GTL NiCo 2 S 4 /rGO/FP electrode has stable sensing performance and is highly selective toward analyte for physiological interfering species. The excellent electrochemical performance of GTL NiCo 2 S 4 /rGO/FP composite is attributed to the GTL structure of NiCo 2 S 4 . By studying the hydrothermal reaction time, electrochemical active surface area, and hydrophilic-hydrophobic surfaces of GTL NiCo 2 S 4 /rGO/FP composite, the relationship between the microstructure and sensing performance of the composite was elucidated. Surely this study opens up new possibilities for the application of low-cost, biodegradable flexible electrode materials in wearable sensors in the near future.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Han Chen,Xingxing Wu,Chunfeng Lao,Yingchun Li,Qunhui Yuan,Wei Gan
Metal organic framework (MOF), as an emerging type of porous materials, has attracted great interest in numerous fields. In this study, combining the advantages of MOF derived carbon and reduce graphite oxide (rGO), two types of MOF derived carbon modified reduced graphite oxide (ZIF-8C@rGO) were developed. When applied as electrode modifier in an electrochemical determination of hydroquinone (HQ) and catechol (CC), the obtained ZIF-8C@rGO exhibits remarkably improved selectivity and sensitivity than the ZIF-8C counterpart, attributable to the synergistic effect of the self-templated ZIF-8C anchors and the graphitized rGO substrate. Electrochemical results show that the ZIF-8C@rGO based sensor exhibits a wide linear range of 0.5 to 70 μM for both HQ and CC, with low detection limits of 0.073 μM for HQ and 0.076 μM for CC, respectively. A trial of monitoring HQ and CC in real water sample demonstrates the feasibility of the proposed ZIF-8C@rGO based sensor.
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高影响因子
Environmental Science-Water Research & Technology
·
2019
·Vol. 6
·期 2
·303-311
·
IF 4.195
Chengxu Li,Shiyong Wang,Gang Wang,Shuaifeng Wang,Xiaoping Che,Duanzheng Li,Jieshan Qiu
Capacitive deionization (CDI) has developed rapidly due to its advantages of low energy consumption and eco-friendliness. In recent years, many researchers have devoted their efforts to fabricating new electrode materials in order to achieve superior desalination efficiency and excellent long-term recycling stability. Herein, a new CDI cathode material — an NH4V4O10/rGO (NHVO/rGO) composite — was synthesized using a simple hydrothermal process. The as-prepared ammonium vanadium bronze NH4V4O10 (NHVO) displayed a large 2D layer spacing, of about 1.0 nm, and was hence tested as a potential Na+-intercalating material. The graphene present in the composite played a significant role in improving the electrical conductivity of NHVO, greatly promoting its desalting efficiency. During desalination tests, an NHVO/rGO-based CDI system delivered a NaCl removal capacity of 20.1 mg g−1 at an applied voltage of 1.2 V in a 500 mg L−1 NaCl solution; that is, the NHVO/rGO composite displayed a remarkable salt removal performance. Due to the excellent desalination performance of this system, the NH4V4O10/rGO composite is expected to become an appealing candidate for enhancing the performance of CDI electrodes.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Peiman Xu,Jinming Zhang,Zhifeng Ye,Yiyi Liu,Tianlun Cen,Dingsheng Yuan
Tailoring low-cost electrocatalysts with high activity and good stable for hydrogen evolution reaction (HER) is vital to energy harvesting and storage. Herein, Co doped Ni 0.85 Se nanoparticles supported on reduced graphene oxide (Co Ni 0.85 Se/RGO) were synthesized by a facile one-step hydrothermal method . As expected, the resulting hybrid materials effectively inhibit the aggregation of nanoparticles and possess the enhanced intrinsic conductivity, leading to exposure of more active sites and the faster electron transport . And then these beneficial effects enable Co Ni 0.85 Se/RGO efficient HER catalytic activity in both acid and basic electrolytes, achieving small overpotentials of 148 and 128 mV at a current density of 10 mA cm − 2 in 0.5 M H 2 SO 4 and 1.0 M KOH, respectively.
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IONICS
·
2019
·Vol. 25
·期 10
·4739-4749
·
IF 2.289
Han Tao,Han Jia-Jun,Ma Hui,Zhang Ning,Sun Dan-Dan
Graphene oxide (GO) was synthesized by the modified Hummers method and then reduced with NaBH 4 to form RGO with a regular layered structure. The graphene oxide is benzenesulfonated to obtain a functionalized graphene material (RGO-BS). The benzenesulfonated polyaniline/RGO composite (PANI/RGO-BS) was prepared by adsorption double oxidation method using RGO as template. Some physical characterization methods (X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy) were used to analyze the morphology and crystallinity of the composite. The electrochemical properties were characterized by cyclic voltammetry, impedance spectroscopy, galvanostatic charge/discharge, and rate capability. The initial discharge specific capacities of oxidized PANI/RGO-BS and reduced PANI/RGO-BS were 165.4 and 176 mAh/g. After 100 cycles, the capacity retention rates were 92.6% and 96%, the coulombic efficiency of the battery is close to 100%. These results indicate functionalized composite has exciting potentials for the cathode material of lithium-ion battery.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Rui Zhang,Youfeng Cai,Xuyang Zhu,Qiong Han,Tongqing Zhang,Yi Liu,Yu Li,Ailian Wang
In this study, a reduced graphene oxide/silver phosphate (RGO/Ag 3 PO 4 ) was obtained via polydopamine (PDA) modification, and the PDA/RGO/Ag 3 PO 4 composite was coated on the pure polyvinylidene fluoride (PVDF) membrane, which named PDA/RGO/Ag 3 PO 4 /PVDF memebrane. The PDA/RGO/Ag 3 PO 4 was characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Futhermore, the SEM, Energy dispersive spectrometer (EDS) spectrograms and Atomic force microscopy (AFM) were used to characterize the morphology structure, elemental mapping and roughness of PDA/RGO/Ag 3 PO 4 /PVDF memebrane. The results showed that the composite membrane has a good effect on the degradation of dyes, and the rejection rate of MB reached 99% with an increasing of the composite material ratio. The hydrophilicity of the membrane surface increased by measuring the contact angle, with decrease to 59.2°compared with 88.2°of pure PVDF membrane. In addition, under the visible light irrradiation, the coated membrane still keeps stable flux and high separation efficiency after 5 cycles. Hence, this study provides an attractive PVDF modified membrane.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Chongjun Zhao,Pengwei Li,Danmin Shao,Ruizhi Zhang,Shengqi Wang,Zhaoqiang Zhu,Chunhua Zhao
A phytic acid-derived Co 2-x Ni x P 2 O 7 -C/RGO composite was designed and facilely synthesized, in which phytic acid acted as both a phosphoric source and carbon source. Both carbon derived from phytic acid and reduced graphene oxide (RGO) in composite, enhanced the conductivity and thus improve its electrocatalytical capability. As-synthesized Co 1.22 Ni 0.78 P 2 O 7 -C/RGO composite exhibited excellent oxygen evolution reaction (OER) catalytic performances: At the current density of 10 mA cm −2 , only a low overpotential of 283 mV and a small Tafel slope of 51 mV dec −1 were observed. Good OER catalytic performance was retained even after 10 h continuously running at a constant voltage, which is even comparable to those of first-rate noble metal catalyst RuO 2 . In addition, the performances of Co 2-x Ni x P 2 O 7 -C/RGO catalysts were also strongly dependent on Ni content.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 24
·25286-25300
·
IF 2.914
Liu Fang,Che Yangli,Chai Qingwen,Zhao Mengfei,Lv Yan,Sun Hui,Wang Yongqiang,Sun Juan,Zhao Chaocheng
Copper and zinc composite oxides (Cu 2 O/ZnO) were synthesized by an impregnation-reduction-air oxidation method. A series of Cu 2 O/ZnO/rGO ternary composites were prepared by coupling with graphene oxide (GO) with different mass fractions in a solvothermal reaction system. The microscopic morphology, crystal structure, and optical characteristics of the photocatalysts were characterized. The degradation of p-Nitrophenol (PNP) and polyacrylamide (PAM) by photocatalytic materials under simulated solar irradiation were studied, and the degradation kinetics were also investigated. The results showed that cubic Cu 2 O was modified by ZnO nanorods and distributed on rGO nanosheets. The ternary Cu 2 O/ZnO/rGO nanocomposites have stronger simulated solar absorption ability and higher photodegradation efficiency than pure ZnO and binary Cu 2 O/ZnO nanocomposites. When the amount of Cu 2 O/ZnO/rGO-10 was 0.3 g L −1 , the degradation rate of 10 mg L −1 PNP reached 98% at 90 min and 99.6% of 100 mg L −1 PAM at 30 min. The photocatalytic degradation processes of PNP and PAM all followed the pseudo-first-order kinetic model. Free radical trapping experiments showed that superoxide radicals were the main active substances to improve photocatalytic efficiency. In addition, after four recycles, the catalytic efficiency of Cu 2 O/ZnO/rGO-10 was still over 90%. It showed that Cu 2 O/ZnO/rGO-10 was a promising catalyst for wastewater treatment because of its good photostability and reusability.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yongmin Huang,Jiaxing Ouyang,Xun Tang,Yao Yang,Jiangfeng Qian,Juntao Lu,Li Xiao,Lin Zhuang
This work reports a novel Ga-based material, NiGa2O4, which is typically used as a photocatalyst for water splitting, as an anode for Li-ion battery with a long cycle life. High-surface-area reduced graphene oxide (rGO) has been used as the conductive substrate to avoid the aggregation of NiGa2O4 nanoparticles (NPs). Because the size and shape of NiGa2O4 are very sensitive to the pH of the precursor, ethylene glycol has been employed as the solvent, as well as the reduction agent to reduce GO, to avoid using extra surfactants and also to avoid the variation of pH of the precursor. The obtained NiGa2O4/rGO composite possesses high capacity and long cycle life (2000 cycles, 2 A/g), with NiGa2O4 NPs around 3–4 nm that are uniformly distributed on the rGO surface. Full cell performance with LiCoO2 as cathode has also been studied, with the average loss of 0.04% per cycle after 100 cycles (C/2 of LiCoO2). The long cycle life of the composite was ascribed to the self-healing feature of Ga0 formed during charging.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Di Huang,Lingxi Yang,Xing lin Li,Lina Zou,Baoxian Ye
A novel electrochemical sensor was designed and constructed for high-sensitive detection of Taxifolin based on Co 3 S 4 @MoS 2 loaded on reduced graphene oxide (RGO-Co 3 S 4 @MoS 2 ) as modified materials. It’s the first time for Co 3 S 4 @MoS 2 was exploited to constructed electrochemical sensor. Owing to the Co 3 S 4 @MoS 2 providing a huge surface area to enrich more Taxifolin and the excellent electric conductivity of RGO, Taxifolin was detected sensitively with a linear range from 5.0 × 10 −9 to 1.0 × 10 −6 mol L − 1 and limit of detection down to 1.67 × 10 −9 mol L − 1 (S/N = 3). In addition, the sensor also demonstrated strong anti-interference properties in the presence of some metal ions and organic compounds. The proposed method was successfully applied for determination of Taxifolin in traditional Chinese medicine in fructus polygoni orientalis with satisfactory results.
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高影响因子
Materials
·
2018
·Vol. 11
·期 9
·1720
·
IF 2.467
Qiuyan Hao,Guoliang Cui,Yuan Tian,Taizhe Tan,Yongguang Zhang
In this paper, the synthesis of the three-dimensional (3D) composite of spherical reduced graphene oxide (RGO) with uniformly distributed CeO2particles is reported. This synthesis is done via a facile and large-scalable spray-drying process, and the CeO2/RGO materials are hydrothermally compounded with sulfur. The morphology, composition, structure, and electrochemical properties of the 3D S/CeO2/RGO composite are studied using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), Raman spectra and X-ray photoelectron spectroscopy (XPS), etc. The electrochemical performance of the composites as electrodes for lithium–sulfur batteries is evaluated. The S/CeO2/RGO composites deliver a high initial capacity of 1054 mAh g−1, and retain a reversible capacity of 792 mAh g−1after 200 cycles at 0.1 C. Profiting from the combined effect of CeO2and RGO, the CeO2/RGO materials effectively inhibit the dissolution of polysulfides, and the coating of spherical RGO improves the structural stability as well as conductivity.Keywords:Lithium–sulfur battery;CeO2/RGO composite;electrochemical performance
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