PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Yujie Zhang,Zexin Cui,Rongfang Yuan,Huilun Chen,Beihai Zhou
As the persistent contamination of water sources with antibiotics poses a growing environmental challenge, effective strategies for the degradation of such pollutants are urgently needed. Herein, a novel organic-inorganic Z-scheme heterojunction material, reduced Graphene Oxide (rGO)@PANI/SnO 2 , was prepared for the photocatalytic degradation of sulfadiazine (SD). When the PANI/SnO 2 with PANI doping amount of 1% was loaded on 1% rGO, the catalyst showed the best photocatalytic activity, with a reaction rate constant of 0.184 h -1 , which was 32.8 and 7.19 times higher than that of PANI and SnO 2 , respectively. The improved photocatalytic activity was mainly due to the high electrical conductivity of rGO and the formation of a Z-scheme heterojunction between PANI and SnO 2 , which effectively facilitated the transfer of photogenerated carriers. Quenching experiments showed that ·OH is the main active species. Besides, Density Functional Theory (DFT) calculations found that the sulfonamide bond and pyrimidine heterocyclic were vulnerable site in the SD. Then, four possible degradation pathways were proposed, primarily involving the breaking of the sulfonamide bond and the ring-opening of the pyrimidine heterocycle. The response surface method (RSM) was used to confirm that the removal of SD was affected by the single factor of initial SD concentration, pH value and catalyst dosage, and the magnitude of the effect of different parameters was in the order of pH > catalyst dosage > SD concentration. It was found that Cl - and SO 4 2- inhibited the photocatalytic process, whereas HCO 3 - facilitated the process through its ability to produce ·OH by hydrolysis and provide a weakly alkaline environment. This work provides novel ideas for the preparation of organic-inorganic heterojunction photocatalysts and enhances the application of organic materials in the photocatalytic degradation of antibiotics in water.
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Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Wei Wei,Shiqian Gao,Feiyue Qian,Chongjun Chen,Youyi Wu
Reduced graphene oxide modified CoFe2O4 (CoFe2O4/rGO) magnetic nanoparticles (MNPs) were synthesized by employing an in situ crystallization microwave irradiation method. The morphology and textural properties of CoFe2O4/rGO were characterized using SEM, TEM, BET/BJH and XPS. GO was reduced to rGO via the thermal catalysis of Co(acac)2, which contributed to expanding the effective microwave absorption bandwidth of carbon-based materials. The lattice stability of CoFe2O4 effectively improved Snoek's limit and protected the catalytic active site distribution of CoFe2O4/rGO nanoparticles. The CoFe2O4/rGO composites were selected as a heterogeneous catalyst to initiate the activation of peroxymonosulfate (PMS) for the generation of reactive oxygen species (ROS) and degrade 2-aminobenzothiazole (ABT) in a water sample. Under optimal conditions, the coupling of CoFe2O4/rGO and PMS can completely degrade ABT in aqueous solutions within 90 minutes. The effect of inorganic anions, metal cations and humic acid (HA) on the degradation efficiency of ABT was explored. Experimental results showed that the presence of HA and low concentrations of Cu2+ enhanced the process performance remarkably, while the addition of NO3−, SO42−, Zn2+, Cd2+ and high concentrations of Cu2+ suppressed the degradation of ABT. Meanwhile, the absence of Cl− and HCO3− presented no significant influence on the degradation. Radical quenching experiments indicated that SO4−·, ·OH and non-free radicals of 1O2 were involved in the CoFe2O4/rGO-PMS system, with the former two being the dominating radical species. A degradation efficiency of 100% was obtained when the proposed method was applied to the degradation of ABT in actual water samples. The CoFe2O4/rGO catalyst-activated PMS processes offered a reference to eliminate refractory organics in water.
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RSC Advances
·
2017
·Vol. 7
·期 88
·55790-55795
·
IF 3.108
Yunfei Sun,Yanfeng He,Bo Tang,Chongben Tao,Jianmin Ban,Li Jiang
RGO nanosheets-modified epoxy resin (ER) is a major research interest because of the high thermal performance of the resulting thermal interface materials (TIMs). In this study, the attention is focused on the influences from the types of functional groups of the RGO nanosheets on the obtained thermal conductivity. Among all the types of functional groups, the carboxyl group is found to play the most important role to enhance the phonon transport at the interface between the graphene basal plane and ER, which is proven by the obtained thermal conductivity and calculated thermal boundary resistance. A close chemical contact between the graphene and ER is one of the key factors in the resulting high thermal conductivity. Moreover, the formed chemical bond based on the carboxyl group from the RGO and hydroxyl (epoxy) group from the ER also exerts a positive influence on the resulting mechanical performance, which endows a satisfactory ultimate strength and stretch limits to the as-prepared TIMs. The findings of this study reveal the core factors which determine the obtained performances of the graphene-assisted ER, providing a path to further enhance the thermal and mechanical properties of the TIMs for practical application.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Jingyi Luo,Danfeng Jiang,Tao Liu,Jingmeng Peng,Zhenyu Chu,Wanqin Jin
In this work, a novel sandwich-type aptasensor was designed for the ultrasensitive recognition of trace mercury ions in water. Numerous oriented platinum nanotube arrays (PtNAs) were in-situ crystallized on a flexible electrode as a sensing interface, while thionine labelled Fe 3 O 4 /rGO nanocomposites as signal amplifiers. Both PtNAs/CF and nanocomposites were synthesized by easy hydrothermal processes. With their large surface area, it was favorable for electrochemical performance and immobilization of capture DNAs (cDNA) and report DNAs (rDNA). Upon the existence of Hg 2+ , partial linker DNAs were tightly bound with cDNAs through thymine-Hg 2+ -thymine pairing (T-Hg 2+ -T). Then rDNAs attached Fe 3 O 4 /rGO nanoprobes were fixed on the electrode through the match of remaining linker DNAs and rDNAs. Under the optimal conditions, the Hg 2+ aptasensor showed a synergistic amplification performance with a wide linear range from 0.1nM to 100 nM, as well as a low detection limit of 30 pM. Moreover, the as-prepared aptasensor also exhibited reliable performance for assay in real lake water samples.
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高影响因子
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
·
2018
·
IF 3.638
Songsong Zhang,Beibei Qiu,Jinhua Zhu,Weiping Hu,Fanyi Ma,M. Z. H. Khan,Xiuhua Liu
Present study aimed to immobilise the α-glucosidase on suitable supports to construct enzymatic microreactors and their subsequent applicability in efficient inhibitor screening from the Chinese Yam (Dioscorea opposita Thunb.) peel. A type of lamellar and porous composites (rGO@Fe3O4) were synthesised with a facile one-step solvothermal method and employed as carriers to construct enzymatic microreactors for screening α-glucosidase ligand from the Chinese Yam peel in league with the high performance liquid chromatography and mass spectrometry (HPLC-MS). The immobilisation amount of α-glucosidase on rGO@Fe3O4 under the optimised conditions was about 40 μg α-glucosidase/mg carriers. Furthermore, the binding capacities of screened inhibitors, 2,4-dimethoxy-6,7-dihydroxyphenanthrene and batatasin I, were 35.6 and 68.2%, respectively. Hence, considering their high screening efficiency and excellent magnetic separation ability, these as-prepared nanocomposite consisting of rGO and Fe3O4 may be potential supports for the enzyme (such as α-glucosidase) immobilisation for rapid α-glucosidase inhibitors screening from the diverse nature resources.
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高影响因子
CARBON
·
2024
·
IF 10.5
Yuan Guo,Yuping Duan,Xiaoji Liu,Jie Tian,Ningxuan Wen,Zeng Fan,Lujun Pan
Graphene aerogels have attracted increasing attention in electromagnetic wave (EMW) absorption due to their ultra-low density and excellent dielectric performance. However, pure graphene aerogels have limited loss mechanisms, and it remains a challenge to introduce multiple loss mechanisms while maintaining lightweight. Here, reduced graphene oxide/metal organic framework (MOF)-derived carbon nanotubes (rGO/MD@CNTs) aerogels are successfully constructed by uniformly compositing GO and MOF particles by hydrothermal treatment and further in-situ growing CNTs by chemical vapour deposition method. GO and MOF particles form strong bonding sites due to their interaction to construct the aerogel with excellent mechanical property, while magnetic loss is also introduced. The MOF-catalyzed CNTs not only contribute to the formation of interface and dipole polarizations, but also effectively regulate the conductivity to improve impedance matching. rGO/MD@CNTs aerogel integrates multiple losses and optimal impedance matching. With a filling ratio of 6 wt%, the aerogel exhibits an excellent reflection loss of −51.6 dB and a wide effective absorption bandwidth of 5.9 GHz. In addition, the aerogel shows good thermal stability and antifreeze properties. Therefore, this work provides an effective strategy for obtaining the aerogel with multiple losses for efficient EMW absorption, demonstrating the potential applications of rGO/MD@CNTs aerogel in complex environments.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Liang Chen,Jialin Zhao,Jinlong Li,Yan Zhuang,Dongxuan Guo,Shuang Meng,Dantong Zhang,Xue Yang,Guozhe Sui
Bimetallic-organic frameworks and their derivatives have attracted intensive attention in the field of photocatalytic hydrogen production due to their high porosity, distinctive three-dimensional structure, and favorable specific surface area. Despite these advantages, the efficiency of photocatalytic hydrogen production remains unsatisfactory owing to rapid complexation of electron-hole pairs and limited visible light utilization. Herein, in this work, the autogenous CuO–ZnO heterojunction nanoparticles are assembled on the surface of reduced graphene oxide (RGO) by calcining copper-zinc bimetallic-organic frameworks. The autogenous heterojunctions offer numerous active sites and enhance electron transfer at tightly bound heterogeneous interfaces. Furthermore, RGO acts as a co-catalyst or substrate, improving photocatalytic performance with its high surface area and excellent electron transport properties. Consequently, the RGO/CuO–ZnO Z-scheme heterojunction achieves an impressive hydrogen production rate of 479.73 μmol g −1 h −1 , which is 94.06 times higher than that of pristine ZnO. Overall, this work optimizes the potential of metal-organic framework-derived photocatalysts in hydrogen production and offers valuable insights into the effective construction of autogenous heterojunctions.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-15
·
IF 5.3
Zhang Shiyu,Chen Xin,Hu Shuai,Cai Ke,Peng Chenxi,Luo Lixia,Gu Yingying,Mei Yong
An electrochemical biosensor was created to identify the liver cancer marker alpha-fetoprotein (AFP) by employing nanocomposite materials. A combination of reduced graphene oxide (rGO) and molybdenum disulfide (MoS 2 ) was selected as the substrate material for the sensor to prepare the PtNPs/MoS 2 @rGO electrochemical immunosensor. Among them, rGO has strong conductivity and MoS 2 provides a large surface area for the anchoring of PtNPs for better attachment to the hybridized nanomaterials. Meanwhile, PtNPs exhibit consistent biocompatibility and excellent electrocatalytic activity. PtNPs also attach to hybrid nanomaterials and bind the antibody via the Pt–S bond, thereby furnishing the antibody with multiple binding sites for enhanced antibody adhesion. The immunosensor achieved ultra-sensitive AFP detection by exploiting the specific antigen–antibody binding. The structure and morphology of the PtNPs/MoS 2 @rGO composites were investigated by transmission electron microscopy (TEM), energy dispersive X-ray (EDS) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy, and the sensor was electrochemically characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under optimized conditions, using differential pulse voltammetry the biosensor detected AFP in serum within a linear range of 1 ~ 10 5 pg/mL, with a correlation coefficient ( r 2 ) of 0.9989, and a detection limit of 0.12 pg/mL ( S / N = 3). The method offers a new approach for the ultrasensitive detection of serum AFP and is extremely selective, accurate, and precise with a relative standard deviation (RSD) of less than 6%. It has been successfully applied to the analysis of real human blood samples. Graphical
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Environmental Science-Nano
·
2024
·Vol. 11
·期 7
·3104-3113
·
IF 5.8
Feijin Zhou,Wenying Cui,Chenggang Liu,Cheng Yao,Chan Song
Exploring novel nanozymes with high activity and stability is necessary in sensing to replace some natural enzymes. Here, iron phthalocyanine (FePc) was supported on two-dimensional (2D) reduced graphene oxide (rGO), synthesizing FePc@rGO nanocomposites by a one-pot method. FePc@rGO nanocomposites not only can catalyze the oxidation of colorimetric substrates, but also can degrade rhodamine B (RhB) with the help of permonosulfate (PMS). With the introduction of rGO, FePc was loaded on their surfaces. Compared with free FePc, FePc supported on rGO has smaller size, resulting in its larger specific surface area. These factors are better for exposing the active sites of catalysts and increasing the mass transfer rate between catalysts and substrates. Therefore, FePc@rGO nanocomposites exhibit enhanced catalytic activity. Based on the oxidase-like activity of FePc@rGO nanocomposites, a sensing platform was constructed for the detection of thiosulfate (S2O32−) with a detection limit of 0.124 μM and a detection range of 2–50 μM. In addition, this sensing system can be used for the visual detection of S2O32− by a portable smartphone. Furthermore, the degradation efficiency of FePc@rGO nanocomposites to RhB could be as high as above 94% for just 10 min when the pH ranged from 3 to 10. This work provides an avenue for the synthesis of novel catalysts as multifunctional nanozymes for detection and organic pollutant degradation.
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CHEMICAL PAPERS
·
2024
·
IF 2.1
Liu Zitong,Liu Jiali
Green water-based paint cannot exhibit antibacterial property. For good antibacterial property, ZnO/reduced graphene oxide (rGO) nanofiller was added. Graphene oxide and ZnO/rGO composite were synthesized. Then, ZnO/rGO/paint composite coating with excellent antibacterial property was prepared. As ZnO content in ZnO/rGO filler is increased, antibacterial property of coating is improved. In fighting against Escherichia coli and Staphylococcus aureus , pristine coating shows low antibacterial rates of 0.50% and 0.48%, respectively. When ZnO was added, antibacterial rates of coating were be increased to 49.31% and 41.67%. When ZnO/rGO filler was used, antibacterial rates were increased to 65.46% and 62.17%. At a higher load of ZnO/rGO filler, antibacterial rates reached 93.37% and 83.38%. Friction coefficient of ZnO/rGO/paint composite coating was decreased to 0.53 compared with original coating. At a higher dose of ZnO/rGO filler, friction coefficient was decreased to 0.40. Properties of ZnO/rGO/paint coating meet a national standard for water-based wood coatings for indoor decoration. This composite coating with excellent antibacterial property and wear resistance can be applied in eco-friendly indoor decoration.
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Chemosensors
·
2024
·Vol. 12
·期 5
·82
·
IF 3.7
Minghui Yu,Chongyang Qin,Zhi Yu,Biao Sun,Dejiang Ni,De Zhang,Pei Liang
Surface-enhanced Raman scattering (SERS) provides an alternative rapid detection method for pesticide residues in food, but fenvalerate possesses poor affinity to the novel metal substrate, thus restricting its analysis. To break this bottleneck, a SERS-active platform with an Ag/rGO composite structure was engineered using a facile method for fenvalerate detection. Ag nanoparticles with a 60 nm diameter can grow evenly on the top and bottom of rGO layers under intense ultrasonic oscillation, and rGO in hybrid material acts as an ideal hotspot holder between the gaps of Ag nanoparticles, not only allowing the interaction area to be enhanced both electromagnetically and chemically but also enabling the capture and enrichment of fenvalerate pesticide molecules into the “hotspot” area to improve detection sensitivity. Ag/rGO composite substrate possesses superior SERS performance with an ultralow detectable concentration of 4-aminothiophenol (10−10M) and good reproducibility, endowing the material with a better enhancement effect than pure Ag nanoparticles. When used as the SERS substrate for fenvalerate detection, Ag/rGO composite material showed excellent performance in both experiments and theoretical calculation, with the limit of detection (LOD) of fenvalerate being as low as 1.69 × 10−5mg/kg and a detection model with an R2of 99.2%, demonstrating its exciting potential as a SERS substrate for pesticides detection.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Guangfa Zhang,Yuekang Zhang,Jingxian Jiang
Given the ever-growing global water resource crisis, exploiting multifunctional materials featuring with high interfacial solar steam generation efficiency and good purification capability to achieving seawater desalination and wastewater treatment simultaneously are highly desired, yet it still remains a huge challenge to date. Herein, robust and multifunctional MXene/rGO (MRGA) and polydopamine & chitosan @ MRGA (CS&PDA@MRGA, CPM) three-dimensional composite aerogels with distinct interconnected cellular architecture were developed via a facile ice template-assisted chemical reduction self-assembly technology and subsequent sequential deposition modification. Due to the favorable graphene oxide-assisted assembly behavior, the resultant aerogels displayed a desirable mechanical robustness along with an excellent lightweight property. Benefiting from the strong electrostatic interaction deriving from aerogel surface moieties and dye molecules, MRGA-12 exhibited a prominent adsorption capability towards various dyes and achieved a superb adsorption capacity of up to 396.05 mg/g for malachite green (MG). Moreover, by virtue of the synergistic effect between the intentionally regulated low reduction degree of rGO and the integration of PDA and CS, CPM-12 achieved a dramatically reduced evaporation enthalpy of water from 2256 to 1617.18 J/g. Accordingly, this distinct feature resulted in an extraordinary solar-driven interfacial evaporation performance with a remarkable evaporation rate of 1.86 kg/m 2 /h and a high evaporation efficiency of 83.28 % under 1 sun illumination. Therefore, together with the terrific oil/water separation capability, these novel MXene-based aerogels hold a great potential for high-performance solar-driven interfacial evaporation and wastewater treatment.
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