APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yong Yang,Jiajia Wu,Tingting Xiao,Zheng Tang,Jinyou Shen,Haijin Li,Yong Zhou,Zhigang Zou
A unique urchin-like CoZnAl-LDH/RGO/g-C 3 N 4 (LDH/RGO/CN) Z-scheme photocatalyst, which is fabricated by the hydrothermal synthesis of CoZnAl-LDH and the in situ loading of RGO and g-C 3 N 4 , is developed for the photocatalytic conversion of CO 2 . The special spiny external surface and hollow inner cavity endow LDH/RGO/CN with a significantly enhanced light-harvesting capacity. The well-distributed g-C 3 N 4 nanosheets on the CoZnAl-LDH nanoplates, combined with RGO as an electron mediator, constructs an excellent heterosystem with numerous interfaces, efficient charge separation and highly exposed catalytic active sites. The Z-scheme charge-transfer process promotes the oxidizability and reducibility of CoZnAl-LDH and g-C 3 N 4 . Furthermore, the synergistic effect among the components contributes to intense adsorption and chemical activation towards CO 2 , which reduces the reaction barrier for CO 2 photoreduction. As a result, the optimized LDH/RGO/CN exhibits highly efficient and selective photocatalytic CO 2 conversion to CO. The special 3D urchin-like architecture paves a new way for design of photocatalyst with ideal performance.
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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Xiaojie Li,Hui Shi,Kai Pan,Miao Dai,Wei Wei,Xiaoya Liu
Zinc-lithium (Zn-Li) alloys have attracted considerable attention as potential biodegradable orthopedic implant materials . However, the biocompatibility and antibacterial property need further improvement to meet the clinical requirements. In this study, poly(γ-glutamic acid)- g -dopamine/copper (γ-PGA- g -DA/Cu) hybrid coatings were fabricated on a Zn alloy to improve its biocompatibility and antibacterial performance. Corrosion analysis in simulated body fluid indicated that the γ-PGA- g -DA/Cu coatings afforded tunable degradation rates of Zn alloys. The cytotoxicity evaluation revealed that the presence of copper ions in the coatings could reduce the cytotoxicity problem caused by zinc ions and enhance the biocompatibility of Zn alloy. In vitro antibacterial tests exhibited that the antibacterial activity of Zn alloy enhanced due to the γ-PGA- g -DA/Cu coatings and the antibacterial performance of γ-PGA- g -DA/Cu coated samples increased with increasing copper content of the coatings. In summary, γ-PGA- g -DA/Cu coatings provide a feasible strategy to design Zn alloy implant materials with improved functional performance.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2018
·Vol. 410
·期 29
·7645-7653
·
IF 3.307
Zhang Dong-Ping,Wang Ling-E,Liu Xiao-Ying,Luo Zhi-Hua,Zheng Lei,He Yun,Zhang Bo
A facile and feasible photoelectrochemical (PEC) immunoassay based on plasmon-enhanced energy transfer between gold nanoparticles (AuNPs) and CdS quantum dots (QDs)/g-C 3 N 4 nanosheets was developed for the ultrasensitive detection of lipoprotein-associated phospholipase A 2 (Lp-PLA 2 ). To construct such a sensing platform, the immunosensor was prepared by immobilizing Lp-PLA 2 on a CdS QDs/g-C 3 N 4 -modified electrode. A competitive-type immunoreaction was utilized for Lp-PLA 2 detection, with AuNP-labeled anti-Lp-PLA 2 antibody used as the competitor. Introducing AuNPs with the specific antibody for the antigen target Lp-PLA 2 led to heavy quenching of the photocurrent of CdS QDs/g-C 3 N 4 due to the plasmon-enhanced energy transfer between AuNPs and CdS QDs. The quenching efficiency decreased with increasing target Lp-PLA 2 concentration. Under optimal conditions, the PEC immunosensor presented a good photocurrent response to the target Lp-PLA 2 in the dynamic linear range of 0.01–300 ng mL −1 , with a low detection limit of 5.3 pg mL −1 . Other biomarkers and natural enzymes did not interfere with response of this system. The reproducibility and accuracy of this method for the analysis of human serum specimens were evaluated, and the results given by the method developed here were found to closely correspond to the results obtained with commercial Lp-PLA 2 ELISA kits. Importantly, this protocol offers promise for the development of exciton–plasmon interaction-based PEC detection systems.
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PubMed
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
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2022
·Vol. 22
·期 7
·2009-2021
·
IF 3.536
Liu Quanfeng,Yu Jiang,Jiang Yinying,Zhong Chengwei,Ding Senxu,Zhou Peng,Jin Yuanxiao
Purpose Soil organic matter pollution is a serious threat to the human living environment. The purpose of this paper is to investigate the effect of MIL-101(Fe)/g-C 3 N 4 catalyzed peroxynitrite degradation of 2-chlorophenol in soil and to analyze the reaction mechanism and further to explore the optimal parameters of this reaction system with utilizing the mathematical model. Methods MIL-101(Fe)/g-C 3 N 4 was successfully obtained by hydrothermal synthesis method by growing MIL-101(Fe) on the surface of g-C 3 N 4 to catalyze the degradation of 2-CP (2-chlorophenol) in soil by sodium persulfate. The influence factors on the removal rate of 2-CP were analyzed by the response surface methodology (RSM) and combined with theoretical calculations. RSM can be used to model continuous variable surfaces with less data and determine the optimal level range. Results MIL-101(Fe)/g-C 3 N 4 had a good catalytic performance due to its good catalytic properties and the adsorption of g-C 3 N 4 on 2-CP in the system and made the best removal rate of 2-CP increase to 91.2%. The correlation of model fitting results was significant, and the verification of its optimal parameters yielded results with an error of only 4.1%. Conclusion Further studies revealed that SO 4 •− and • OH were the reactive radicals, and SO 4 •− was the dominant, which impelled Fe 2+ and Fe 3+ to interconvert in the complex system. Possible degradation pathways were derived by analyzing the intermediates. Generally, this experiment provides some ideas for future research of MOFs in soil organic pollutant removal systems. Graphical abstract
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Haiyan Wang,Yiming Xie,Yujia Wang,Guosong Lai
The abuse of kanamycin (Kana) in many fields has led to increasing antibiotic pollution problems and serious threats to public health. Therefore, determining how to develop methods to realize the convenient detection of antibiotics in complicated environmental matrices is highly desirable. In this study, we utilized a target biorecognition-triggered hybridization chain reaction (HCR) assembly of a G-quadruplex DNAzyme (G-DNAzyme)-decorated nanotree to develop a novel homogeneous colorimetric biosensing method for the convenient and ultrasensitive detection of Kana antibiotic residues in real samples. Through the designed aptamer-recognition reaction, an Mg 2+ -dependent DNAzyme (MNAzyme) strand can be liberated. Thus, its catalyzed cleavage of the hairpin substrates anchored at a DNA nanowire will cause the assembled formation of an HCR-initiator; this process can be greatly amplified by the exonuclease III-assisted target recycling and the MNAzyme-catalyzed release of another MNAzyme strand. Based on the DNA-nanowire-accelerated HCR assembly of many G-DNAzyme-decorated DNA duplexes on the two sides of the nanowire, a DNA nanotree decorated by numerous G-DNAzymes will form to realize the ultrasensitive colorimetric signal output. Under the optimal conditions, this method exhibited a wide five-order-of-magnitude linear range and a very low detection limit of 28 fg mL −1 . In addition, excellent selectivity, repeatability, and reliability were also demonstrated for this homogeneous bioassay method. These unique features along with its automatic manipulation and low assay cost show promise for practical applications.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2011
·
IF 3.463
Fang Wu,Yong Zhang,Lin Liu,Juming Yao
A new, low-cost, and eco-friendly cellulose-based superabsorbent was successfully prepared from flax yarn waste. The method used was a free-radical graft copolymerization of AA and AM onto a cellulose backbone in a homogeneous aqueous solution. APS was used as the initiator in the presence of a crosslinker, MBA. The effects of various factors on water absorbency were discussed. The factors included reaction temperature, initiator amount, monomer amount, salt solution type, and solution pH. Under the optimized conditions, the water absorbencies of the obtained superabsorbent composite were 875 g/g distilled water, 490 g/g natural rainwater, and 90 g/g 0.9 wt% aqueous NaCl solution. The product also had excellent water retention and salt resistance properties. Fourier-transform infrared spectroscopy and scanning electron microscopy were employed to examine the structure of the prepared superabsorbent.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Boru Gao,Mengmeng Dou,Jin Wang,Shuming Li,Dongying Wang,Lin Ci,Yao Fu
Contaminants such as antibiotics and the resulting antibiotic-resistant bacteria (ARB) and antibiotic-resistant genes (ARGs) have become a hot topic in the field of wastewater purification. In this study, a method was proposed to simultaneously remove antibiotics and reduce ARB and ARGs with C–(N) 3 defect carbon nitride-coupled persulfates (CN-C V2 /PS). The location of the C–(N) 3 defects was determined by a combination of spectroscopic techniques and electron spin resonance tests. Based on photoluminescence and electrochemical tests, and deformation charge density calculations, electron traps were generated at defect sites resulting in enhanced electron–hole separation. The mineralization rates of CN-C V2 /PS for six typical antibiotics were 11–17% and 21–28% higher than those of CN-C V2 and conventional CN , respectively. Over the same reaction time, the inactivation rates of CN-C V2 /PS for E. coli and E. faecalis screened from wastewater treatment plants were 3.6 and 2.7 log higher than that of CN-C V2 . In addition, CN-C V2 /PS showed a reduction rate of more than 2.5 log for tet A and intI 1. DFT calculation showed that due to the formation of defects, the adsorption energy between the PS and catalysts increased from –8.924 eV (CN) to –18.340 eV (CN-C V2 ). At the same time, the effective stretch of peroxide bond of PS changed from 1.505 Å to 1.519 Å. Both results indicated that the activation of PS was significantly enhanced in the presence of the modified CN-C V2 . The synergetic effect of CN-C V2 /PS is expected to remove the antibiotics, resistant bacteria and genes efficiently in future wastewater advanced treatment.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jianfei Li,Bin Zhang,Junyan Lu,Zihao Guo,Mingxia Zhang,Degang Li,Zengdian Zhao,Shasha Song,Yan Liu,Luchang Qin
The path and mechanism of charge transfers in composite catalyst are important for degrading organic pollutants effectively. A quasi-ternary Z-scheme heterojunction photocatalyst with carbon quantum dots (CQD), CdS, and graphitic carbon nitride (g-C 3 N 4 ) (CQD/CdS/g-C 3 N 4 ) has been successfully constructed in this work, and its electron transfer path is elucidated by contrast CdS/CQD/g-C 3 N 4 photocatalyst. The built-in electric field at the interface between CdS and g-C 3 N 4 induces exciton separations. The energy barrier between CQD and CdS accelerated charge transfers and further prevents exciton annihilation. As a result, CQD/CdS/g-C 3 N 4 exhibits the greatest photocatalytic degradation, and the removal rates of Rhodamine B and sulfadiazine are 94.7 % and 76.0 %, which are 2.46 times and 1.47 times of CdS/CQD/g-C 3 N 4 , 7.02 times and 7.92 times of g-C 3 N 4 , respectively. It is further proved that CQD as the active site can promote the generation of H 2 O 2 and effectively inhibit the formation of •O 2 – in the photocatalytic reaction. In addition, the degradation pathway and products of sulfadiazine are explored by means of HPLC-MS and calculation of Gaussian software. This work demonstrates the relationship between photocatalytic activity and electron transfer path, meanwhile, provides a reference for the design of efficient heterogeneous photocatalysts for environmental remediation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Jiangping Jing,Zhuoyuan Chen,Chang Feng,Mengmeng Sun,Jian Hou
Photoelectrochemical cathodic protection is emerging as a green and environmental method to protect metals against corrosion. Graphitic carbon nitride (g-C 3 N 4 ) shows great application potential in this area because of its high efficiency, high stability and low cost. However, the pristine g-C 3 N 4 shows amphoteric properties, resulting in its failure in providing photoelectrochemical cathodic protection for the coupled metal in NaCl solution. In this work, a K&I co-doping technique was performed to modulate the band structure of g-C 3 N 4 , and an n-type g-C 3 N 4 (n-C 3 N 4 ) was obtained. The changes in the molecular structure were studied by SEM, HRTEM , XRD , EDS, XPS and FT-IR technologies. The n-type semiconductor characteristics were verified by the photoinduced i-V curves, SKP potential distributions and pH drift techniques. The n-C 3 N 4 can generate positive photocurrent in the whole investigated potential range, making it able to provide photoelectrochemical cathodic protection for the coupled 316L stainless steel in NaCl solution. This work is very helpful for promoting the application of g-C 3 N 4 in the fields of the photoelectric conversion and the photoelectrochemical cathodic protection.
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CHINESE JOURNAL OF CATALYSIS
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2019
·
IF 4.914
Jianhua Ge,Yujie Liu,Daochuan Jiang,Lei Zhang,Pingwu Du
Photocatalytic H 2 production via water splitting in a noble-metal-free photocatalytic system has attracted much attention in recent years. In this study, noble-metal-free Ni 3 N was used as an active cocatalyst to enhance the activity of g-C 3 N 4 for photocatalytic H 2 production under visible-light irradiation ( λ > 420 nm). The characterization results indicated that Ni 3 N nanoparticles were successfully loaded onto the g-C 3 N 4 , which accelerated the separation and transfer of photogenerated electrons and resulted in enhanced photocatalytic H 2 evolution under visible-light irradiation. The hydrogen evolution rate reached ∼305.4 μmol h −1 g −1 , which is about three times higher than that of pristine g-C 3 N 4 , and the apparent quantum yield (AQY) was ∼0.45% at λ = 420. Furthermore, the Ni 3 N/g-C 3 N 4 photocatalyst showed no obvious decrease in the hydrogen production rate, even after five cycles under visible-light irradiation. Finally, a possible photocatalytic hydrogen evolution mechanism for the Ni 3 N/g-C 3 N 4 system is proposed.
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Xiangwei Tang,Rongdi Tang,Zhanpeng Zhou,Ling Li,Yaocheng Deng,Daoxin Gong,Lihua Yang,Tianwei Song,Mingxuan He
In the field of photocatalysis , Graphitic carbon nitride (g-C 3 N 4 ) has received a lot of attention for its superior functionality and benefits. However, it suffers from the fatal defect of low charge separation efficiency, which is well addressed by tourmaline's self-contained surface electric field. In this work, tourmaline/g-C 3 N 4 (T/CN) composites were successfully synthesized. Due to its surface electric field effect, tourmaline and g-C 3 N 4 are stacked on top of each other. It makes its specific surface area increase greatly and more active sites are exposed. Additionally, the rapid separation of photogenerated electron holes under the action of electric field promotes the photocatalytic reaction. T/CN exhibited excellent photocatalytic performance under visible light, with 99.9% Tetracycline (TC 50 mg L −1 ) removal after 30 min. Compared to tourmaline (0.0160 min −1 ) and g-C 3 N 4 (0.0230 min −1 ), the T/CN composite's reaction rate constant (0.1754 min −1 ) was 11.0 and 7.6 times higher. A series of characterizations also determined the structural properties and catalytic performance of the T/CN composites, which were found to have a larger specific surface area, narrower band gap, and higher charge separation efficiency compared to the monomer . In addition, the toxicity of tetracycline intermediates and their degradative pathways were investigated, and the toxicity of the intermediates was found to be reduced. Given the quenching experiments and active substance determination, it was also found that h + and ·O 2 − play a major role. This work provides more inspiration for photocatalytic material performance research as well as green innovation for environmental management.
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高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 12
·1764-1772
·
IF 1.158
An Ji-Bin,Hu Dai-Peng,Li Yan-Lin,Chen Na-Li
The Magnetic photocatalytic cobalt ferrite/graphitic-carbon nitride (CoFe2O4/g-C3N4) composites with enhanced photocatalytic activity were successfully fabricated through a simple calcination method. Scanning electron microscopy, powder X-ray
diffraction, and infrared spectroscopy were applied to characterize the samples. The photocatalytic behavior of CoFe2O4/g-C3N4 was assessed by degradation of atrazine in photo Fenton-like system under visible light irradiation. The results showed
that CoFe2O4/g-C3N4 with 2.0 gL–1 catalyst loading in the presence of 1 mM peroxymonosulfate (PMS) exhibited the best catalytic performance, and more than 97% of atrazine was destructed in 12 min. This enhancement could be attributed
to the synergistic effect between CoFe2O4 and g-C3N4 promoting longer lifetime of separated electron–hole pairs derived from the formation of the heterojunction between CoFe2O4 and g-C3N4. This could
enhance the composite-mediated activation of PMS for the visible-light driven degradation of atrazine. Moreover, the quenching tests showed that sulfate radicals were responsible for the atrazine degradation. CoFe2O4/g-C3N4 composites have strong
magnetic ability, thus their recovery from water could be readily achieved by applying external magnetic field. This study demonstrates reasonable performance of the PMS/CoFe2O4/g-C3N4 system in water matrix as potentially important candidate for
environmental remediation.
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