SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shi Zhou,Jing Yin,Qiang Ma,Baikerouzi Baihetiyaer,Jiaxue Sun,Ya Zhang,Yanji Jiang,Jun Wang,Xianqiang Yin
In this study, a type of montmorillonite-reduced graphene oxide aerogel (M−rGO) was successfully prepared by the sol–gel method and used for the effective removal of heavy metals (cadmium, Cd) and cationic dyes (methylene blue, MB) in wastewater. The chemical composition and micromorphology of the resulting M−rGO were characterized utilizing scanning electron microscopy and energy dispersive spectrometry, Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, and X-ray diffraction. Furthermore, the effects of the initial concentration, adsorption time, and temperature on the static adsorption process were systematically studied. Equally important, the effects of the concentration, pH, ionic strength (IS), and pumping flow rate of contaminated solution on the dynamic removal of Cd and MB by M−rGO were investigated by a fixed-bed column experiment. The kinetics, isothermals, and thermodynamic adsorption experiment results showed that the Langmuir and pseudosecond-order models best suited the adsorption process in which physical adsorption and chemical adsorption act together. Functional groups containing O and C were involved in the adsorption of Cd and MB, and the hydrogen bonds, π-π, n-π interaction, and hydrophobic interaction between M−rGO and MB made important contributions to adsorption. The lower initial concentration, higher pH value, and slower pumping flow rate of the contaminated solution can effectively increase the dynamic adsorption capacity of Cd and MB on M−rGO. Contrary to that of Cd, the adsorption capacity of MB on M−rGO increased with IS. Both static adsorption and dynamic column experiments confirmed that the presence of Cd promoted the adsorption of MB, and MB inhibited the adsorption of Cd by M−rGO. In addition, the Cd/MB combined pollution wastewater experiment and the regeneration study showed that M−rGO could be a cost-effective and promising sorbent for Cd and MB wastewater treatment due to its high efficiency and excellent reusability.
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高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Kun Jiang,Jin Zhang,Yingfei Wan,Zengjian Liu,Jinwei Chen
In order to obtain the advanced photocatalyst with high performance for removing the gaseous formaldehyde, a new strategy with amination of titanium dioxide (TiO 2 ) and combination with reduced graphene oxide (rGO) is proposed in this work. TiO 2 was first aminated into amino-TiO 2 and then combined with rGO by an electrostatic self-assembly process to form the amino-TiO 2 /rGO photocatalysts. The structure and morphology were characterized by XRD , FTIR, and SEM, respectively. Physicochemical properties were measured by EIS, XPS , ESR , PL , and photocurrent measurements. The mechanism of the photocatalytic reaction was studied. Optimal amino-TiO 2 /rGO catalyst exhibits high catalytic activity and recyclability. The reaction rate constant of HCHO over this catalyst is approximately 9.8 × 10 −3 L mol −1 ·min −1 , which is 10.5 times higher than that of the commercial Degussa P25 TiO 2 . The analysis results from XPS and ESR indicates that the high catalytic activity could be mainly attributed to the imine formed by chemisorption of amino and HCHO. The reaction speed of formaldehyde photolysis increases as the concentration of HCHO on the photocatalyst surface increased. In addition, the introduction of graphene enhances carrier separation efficiency so that leads to more reactive radicals such as hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ), leading to improved performance on formaldehyde photolysis. This could provide a useful method for highly efficient formaldehyde photocatalysis .
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CHEMOSPHERE
·
2021
·
IF 7.086
Jingwei Feng,Peng Nian,Lu Peng,Aiyong Zhang,Yabing Sun
Non-thermal plasma (NTP) combined with zinc ferrite-reduced graphene oxide (ZnFe 2 O 4 -rGO) nanocomposites were used for the degradation of aqueous methylparaben (MeP). ZnFe 2 O 4 -rGO nanocomposites were prepared using the hydrothermal method, with the structure and photoelectric properties of nanocomposites then characterized. The effects of discharge power, initial MeP concentration, initial pH, and air flow rate on MeP degradation efficiency were investigated, and the multi-catalytic mechanism and MeP degradation pathways were established. Results showed that ZnFe 2 O 4 -rGO nanocomposites with a 10%:90% mass ratio of GO:ZnFe 2 O 4 had an optimal catalytic effect. The MeP degradation efficiency of NTP combined with ZnFe 2 O 4 -rGO (10 wt%), was approximately 25% higher than that of NTP alone. Conditions favorable for MeP degradation included higher discharge power, lower MeP concentration, neutral pH value, and higher air flow rate. The degradation of MeP by NTP combined with ZnFe 2 O 4 -rGO nanocomposites followed pseudo-first-order kinetics. O 2 •- , •OH, H 2 O 2, and O 3 were found to play important roles in the MeP degradation, as part of the multi-catalytic mechanism of NTP combined with ZnFe 2 O 4 -rGO nanocomposites. MeP degradation pathways were proposed based on the degradation intermediates detected by gas chromatography mass spectrometry, including demethylation, hydroxylation, carboxylation , ring-opening, and mineralization reactions. The prepared ZnFe 2 O 4 -rGO nanocomposites provide an approach for improved contaminant degradation efficiency, with reduced energy consumption in the NTP process.
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高影响因子
Catalysts
·
2020
·Vol. 10
·期 2
·189
·
IF 3.52
Ting Zhang,Chunyuan Qian,Pengran Guo,Shuchai Gan,Lingyu Dong,Ge Bai,Qiyang Guo
Ciprofloxacin, a third-generation fluoroquinolones (FQs) antibiotic, is observed to increasingly pollute the environment. In this study, a three-dimensional reduced graphene oxide-attapulgite-based catalyst Fe2O3/RGO-ATP was prepared and used to analyze the degradation of ciprofloxacin in a heterogeneous Fenton reaction. The heterogeneous catalyst Fe2O3/RGO-ATP was prepared by a one-step hydrothermal method, and the samples were characterized using BET(Brunauer-Emmett-Teller) surface area, Raman spectroscopy, X-ray diffraction (XRD), Fourier infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of reaction time, temperature, pH, initial concentration, H2O2dosage and reuse time on the degradation of ciprofloxacin by the catalyst Fe2O3/RGO-ATP was investigated. The optimum conditions of degradation of ciprofloxacin are observed to be 60 °C, pH 5, H2O2concentration of 2.9724 mmol/L, and initial ciprofloxacin concentration of 50 mg/L. The catalyst could be reused several times with a decline in catalytic capacity. Fourier-transform ion cyclotron resonance mass spectrometer (FT) was also employed to study the degradation products of ciprofloxacin in the aqueous solution. The results show that the heterogeneous catalyst Fe2O3/RGO-ATP possessed an excellent ability for the catalytic degradation of ciprofloxacin. Direct hydroxyl oxidation is noted to be the main pathway of degradation of ciprofloxacin, and no defluorination reaction is observed during the degradation process.Keywords:graphene;ciprofloxacin;catalytic degradation;hydroxyl oxidation
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高影响因子
Electrocatalysis
·
2020
·Vol. 11
·期 5
·513-521
·
IF 2.587
Xiao Haolin,Wei Shanshan,Chen Zhencheng,Cao Liangli
Herein we report a label-free amperometric immunosensor based on reduced graphene oxide-tetraethylene pentamine (rGO-TEPA) hybrid material co-modified by gold and iron-oxide magnetic nanoparticles (Au/MNPs-rGO-TEPA) for detection of carcinoembryonic antigen (CEA). The Au/MNPs-rGO-TEPA nanomaterials were prepared and coated on the working electrode as a sensing platform for antibody (anti-CEA) immobilization and signal amplification. This nanomaterial exhibited some excellent functionalities, such as magnetic and enhanced electrical properties due to its large specific surface area and favorable conductivity. Thionine (Thi) molecule was attached onto rGO-TEPA via π-π stacking and was used as an electrochemically active substance. The immunosensor was developed based on the increase in quantity of CEA captured, proportional to the decrease in peak currents of Thi. Under optimal conditions, the Au/MNPs-rGO-TEPA/Thi-based immunosensor showed impressive linear range from 0.1 pg/mL to 150 ng/mL. In addition, the proposed method had excellent linearity, high sensitivity, and relatively good stability, thereby offering a good platform for early clinical analysis.
A novel label-free binary nanoparticle-decorated reduced graphene oxide-tetraethylene pentamine-based electrochemical immunosensor was developed. Au/MNPs-rGO-TEPA/Thi was used as electrochemical sensitive platform for quantitative detection of CEA.
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高影响因子
MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Yong-Yi Zhao,Heng Li,Qing-Mei Ge,Hang Cong,Mao Liu,Zhu Tao,Jiang-Lin Zhao
Fluorescence and electrochemical response of multifarene[3,3](S) to serotonin hydrochloride and its quantitative measurement by hybridization on the surface of reduced graphene oxide were investigated. The fluorescence titration suggested the formation of host–guest complex in a radio of 1:1, and the moderate association constants of (1.7 ± 0.3) × 10 4 M (in DMSO) and (2.7 ± 0.2) × 10 4 M (in water) were obtained by non-linear curve fitting, which implied the supramolecular interaction could be irrelevant to the species of solvents. Furthermore, the hybridization of multifarene[3,3](S) with reduced graphene oxide improved the response to serotonin hydrochloride in both fluorescence and voltammetry, which was employed to realize the quantitative analysis for the drug, and a low limit of detection of 3.9 × 10 −7 M was found for determination in the real simple of human serum.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Kaili Zhang,Juan Chen,Shoujing Yue,Haiyan Zhang,Chao Meng,Jigang Wang
In this work, the core-shell carbonyl iron/SiO 2 (CI/SiO 2 ) decorated reduced graphene oxide (RGO) was prepared. The introduction of the wave transparent medium SiO 2 could make the EM wave easier to enter the material, thus effectively improving the impedance matching of the absorber. Moreover, the unique structure led to Debye relaxation, natural resonance and space charge polarization multi-loss mechanisms which greatly improved the attenuation ability of the absorber. As a result, the EM wave absorbing properties of CI/SiO 2 /RGO was significantly enhanced. The maximum reflection loss (RL) of CI/SiO 2 /RGO composite reached −46.43 dB at 10.79 GHz and the effective absorption bandwidth (RL < −10 dB) was 6.47 GHz covering the whole X frequency band. Meanwhile, the simulation results show that the radar cross section (RCS) can be effectively reduced by coating the CI/SiO 2 /RGO. Therefore, the CI/SiO 2 /RGO composite can be used as an ideal absorber in the EM field and aerocraft stealth design.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 44
·期 2
·833-844
·
IF 3.343
Xiao Wang,Wei Li,Shu-ao He,Qiong Ma,Bingchang Yan,Nan Meng,Lifen Hao
Summary With the improvement of people's living standard, energy shortage is increasingly severe. Photocatalysis technology is one of the most effective means to solve this problem. Generally, poor visible-light response and fast combination of photo-induced carriers are the main limiting factors to traditional photocatalysts. Aiming at this problem, in this paper, AgBr was used as the photosensitizer to immobilize on the surface of reduced graphene oxide (rGO) for the complexation of Ag + ions and carboxyl groups of precursor graphene oxide (GO), then the two-dimensional rGO-AgBr/Ag composites (2D rGAA-α, α = 1, 2 and 3) were synthesized by solvothermal method. The structures, morphologies, chemical bonding states and photoelectrochemical properties of the samples were analyzed to study the samples, and the corresponding visible-light-driven (VLD) catalytic performances were studied by hydrogen evolution reaction (HER). Compared with pure rGO, the light absorption of rGAA-α was almost extended to full spectral range for the Z-scheme heterointerface (rGO-AgBr) construction, and the separation of photo-induced carriers can be promoted effectively. The HER results showed that the average hydrogen evolution rate ( ) of rGAA-α was significantly increased, and the rGAA-2 catalyst presented the highest (72.71 μmol h -1 g -1 ). After six recycling experiments, the very faint activity decrease and unobvious structure change suggested the high photostability. Accordingly, the enhanced catalytic activity of rGAA-α catalysts was attributed to the formation of Z-scheme heterointerface and generation of Ag plasmas, so this study will provide a simple, effective and promising method for hydrogen energy development.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Xuehan Xiao,Zongxue Yu,Zhong Yang,Juan Wang,Qingcan Xiang Ximei Zhu
The treatment of oilfield wastewater has been a problem for oil workers for a long time. Indeed, it is economical, efficient and environmental friendly to treat oilfield wastewater with membrane. However, the contamination and stability of membrane limit the application of membranes. This study focuses on improving the long-term integrated treatment of oilfield wastewater by commercial PVDF membranes in different environments. Sepiolite(Sep)@MnO 2 composites were synthesized by hydrothermal method . SEP@MnO 2 and graphene oxide(GO) were left on the commercial PVDF membrane after vacuum filtration. Then the membrane was subjected to 120 vacuum thermal reduction. The prepared Sep@MnO 2 /RGO composite membrane showed good separation result and flux for different proportion of oilfield wastewater. Moreover, it can remove some common salt (NaCl,MgSO 4 , CaCl 2 , MgCl 2 ) and heavy metal ions (Ni 2+ , Fe 3+ , Cr 6+ ) in oilfield wastewater. Even more valuable, a few addition of H 2 O 2 to oilfield wastewater caused an oxidation reaction and the produced in situ microbubbles greatly enhance the antifouling property of the membrane. After 15 cleaning tests and 12 h of cycling, the membrane still showed strong separation ability. Compared with other oil-water separation membranes reported, this membrane demonstrated a longer and better separation effectively. All the work promotes the application of membrane separation technology in oilfield wastewater treatment . Hopefully, the application of in-situ microbubble method on membrane will solve the problem of membrane pollution in oilfield wastewater treatment.
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Environmental Science-Nano
·
2023
·
IF 7.3
Tao Li,Yuhua Li,Peiyan Qin,Gehong Wei,Chun Chen
Phytophthora sojae is an oomycete pathogen that causes significant agricultural losses worldwide, mainly the soybean damping-off and root/stem rot. To counter this, copper oxide nanoparticles (CuO NPs)/reduced graphene oxide (rGO) composites (CuO-rGO) have been proposed as a potential solution in nano-agriculture. In this study, we aimed to investigate the inhibitory mechanisms of CuO-rGO, CuO NPs, and CuCl2 on P. sojae through phenotypic and transcriptomic analysis. Even a low concentration of 10 mg Cu2+ L−1, CuO-rGO, CuO NPs, and CuCl2 exhibited remarkable inhibitory effects on the pathogen. This was due to the capacity of these three forms of Cu to induce oxidative stress, which caused disruptions in the mycelial cell membrane, intracellular structure, carbon metabolism, organic acid metabolic processes, and amino acid metabolism. Among them, CuO-rGO showed a better slow-release effect and long-lasting antimicrobial properties, making it more suitable for practical agricultural use. Furthermore, the transcriptomic analysis revealed distinct patterns of antioxidant enzyme-related genes among treatments. Compared to the other two treatments, the CuO-rGO treatment showed higher expression of differential expression genes (DEGs) associated with superoxide dismutase (SOD) and peroxiredoxin (PRDX). The CuO NPs treatment had the most significant expression of DEGs related to catalase (CAT), while the DEGs linked to glutathione peroxidase (GPX) were significantly expressed in the CuCl2 and CuO-rGO treatments. These findings suggest that CuO-rGO has great potential as a practical agricultural agent against oomycete pathogens. Further investigations are essential to elucidate the mechanisms underlying the oxidative stress and antioxidant systems induced by different copper forms in the future.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jian Hu,Fei Song,Shuhan Lian,Zhichao Liu,Xiangqi Peng,Jie Wang,Guohao Li,Zhenjun Wu,Xiuqiang Xie,Nan Zhang
Assembling two-dimensional (2D) MXene nanosheets into monolithic three-dimensional (3D) structures is an efficient pathway to transfer the nanoscale properties to practical applications. Nevertheless, the majority of the preparation schemes described in the literature are carried out at relatively high temperatures, which inevitably leads to the notorious high-temperature oxidation issue of MXenes. Preparing MXene-based hydrogels at lower temperatures or even room temperature is of great research importance. In this study, we report a novel and efficient room-temperature gelation method for fabricating 3D macro-porous Ti 3 C 2 T x MXene/reduced graphene oxide (RGO) hybrid hydrogels, using anhydrous sodium sulfide (Na 2 S) as the primary reducing agent and l -cysteine as the auxiliary crosslinker. This room-temperature preparation technique successfully prevents the oxidation issue of MXenes and generates porous aerogels with excellent structural robustness after freeze-drying. As the self-standing anode for sodium-ion storage, the optimized 3D Ti 3 C 2 T x MXene/RGO electrode possesses a specific capacity of 152 mAh/g at 0.1 A/g and good cycling stability with no significant capacity degradation after 500 cycles, which is significantly higher than that of the vacuum-filtered MXene film. This work demonstrates a straightforward room-temperature gelation method for constructing 3D MXene-based hydrogels to avoid the oxidation of MXenes, and casts new insight on the mechanism of the graphene oxide (GO)-assisted gelation.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Ai-Hong Chen,Yue-Jia Yang,Shuai Wang,Li-Ming Yang,Xue-Yun Gao,Dan Cui
Bio-electrochemical systems (BESs) have attracted wide attention in the field of wastewater treatment owing to their fast electron transfer rate and high performance. Unfortunately, the low electro-chemical activity of carbonaceous materials commonly used in BESs remains a bottleneck for their practical applications. Especially, for refractory pollutants remediation, the efficiency is largely limited by the cathode property in term of (bio)-electrochemical reduction of highly oxidized functional groups. Herein, a reduced graphene oxide (rGO) and polyaniline (PANI) modified electrode was fabricated via two-step electro-deposition using carbon brush as raw material. Benefiting from the modified graphene sheets and PANI nanoparticles , the rGO/PANI electrode shows highly conductive network with the electro-active surface area increased by 12 times (0.013 mF cm −2 ) and the charge transfer resistance decreased by 92% (0.23Ω) comparing with the unmodified one. Most importantly, the rGO/PANI electrode used as abiotic cathode achieves highly efficient azo dye removal from wastewater. The highest decolorization efficiency reaches 96 ± 0.03% within 24 h and the maximum decolorization rate is as high as 20.9 ± 1.45 g h −1 ·m −3 . The features of improved electro-chemical activity and enhanced pollutant removal efficiency provide a new insight toward development of high performance BESs via electrode modification for practical application.
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