JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Yiqian Lv,Yueqing Zheng,Honglin Zhu,Yinghao Wu
As a semiconductor material with a 2D-laminate structure, g-C 3 N 4 (bandwidth 2.7 eV) has a similar structure and excellent performance to graphene. However, high surface energy and photogenerated e–h recombination of g-C 3 N 4 seriously hinder its application in the field of marine anticorrosion and antifouling. To solve these problems, we synthesized the g-C 3 N 4 nanosheets decorated with ZnO nanoring via chemical etching technology. Whether the NR ZnO-CNNs have surface protection performance among the pure EP on the corrosion protection for metal substrate were investigated. The antifouling properties NR ZnO-CNNs hybrid were also estimated through photocatalytic bacterial and algae resistance tests. Combined with the electrochemical results, it was found that the impedance modulus of NR ZnO-CNNs/EP within 45 days showed two orders of magnitude higher than that of pure EP in the 3.5 wt% NaCl solution. Besides, Local electrochemical impedance spectroscopy (LEIS) further explored the anticorrosion behavior of NR ZnO-CNNs/EP coating, which indicated that the NR ZnO-CNNs/EP coating with a scratch maintained an excellent corrosion resistance between 0–24 h. Under the visible light conditions, the lifetime of photogenerated e–h was prolonged due to the formation of NR ZnO-CNNs heterojunction structure, it was observed that the antibacterial rate against Bacillus subtilis reached 100% within 8 h. An Antialgae test was performed on chlorella seawater solution, which indicated that 5 mg/mL of NR ZnO-CNNs hybrid could make chlorella sharply reduce within 4 days. Simultaneously, the corrosion protection and photocatalytic antifouling mechanisms of NR ZnO-CNNs were proposed, thus it provided a broader platform for the design of versatile marine protection materials.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhengqing Cai,Yining Huang,Haodong Ji,Wen Liu,Jie Fu,Xianbo Sun
A novel g-C 3 N 5 /Bi 4 O 5 Br 2 surface heterojunction was developed via in-situ growth of Bi-rich Bi 4 O 5 Br 2 on g-C 3 N 5 nanosheets. The optimal composite achieved 3.6- and 16.0- times of sulfathiazole (STZ) degradation activity when compared with pristine Bi 4 O 5 Br 2 and g-C 3 N 5 . The interlayer stacking morphology and extra nitrogen in triazine units significantly narrowed the conduction band of g-C 3 N 5 , which greatly promoted its visible utilization; while the bismuth-rich property of Bi 4 O 5 Br 2 prolonged the excited charge carrier lifetime. Both photoluminescence and electrochemical impedance spectroscopy analysis demonstrated that the type-II surface heterojunction (g-C 3 N 5 /Bi 4 O 5 Br 2 ) offered remarkable charge transfer and separation due to the matched energy band structure. The STZ degradation mechanism and pathways were proposed based on experiments and density functional theory calculation, and the contribution of reactive species for STZ degradation followed the order of O 2 ∙ - > h + > OH. Moreover, the toxicity evolution of STZ was evaluated, suggesting that sufficient mineralization is required to ensure safe discharge. The Box-Behnken experimental design methodology study revealed that g-C 3 N 5 /Bi 4 O 5 Br 2 exhibited high reactivity for antibiotics degradation under different water matrix. This study suggested that g-C 3 N 5 /Bi 4 O 5 Br 2 has great application potential for cost-effective remediation of persistent organic contaminants by using solar light.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wei Wang,Jiaojiao Fang,Hu Chen
Mesoporous materials offer attractive routes for designing photocatalysts with nano-confined structures, high activities, and recyclability. Here we take the core-shell and mesoporous SiO 2 nanoparticles as the template for the in situ synthesis of nano-confined g-C 3 N 4 with controllable structures and quantum size effects by varying the precursor species and concentrations. Results indicate that decrease the cyanamide, the precursor, concentration will improve the specific surface area, adsorption ability, and quantum size effect of the final photocatalysts. Cyanamide aqueous solution with a weight ratio of 50.0 wt% results in the most active photocatalyst containing 31.17 wt% of the confined g-C 3 N 4 with a tetracycline degradation rate of 6.63 times higher than that of the cyanamide-derived bulk g-C 3 N 4 (C) under the xenon lamp irradiation. Replacing the cyanamide with urea can further improve the photocatalytic activity even the more active SiCN(U10) contains only 12.47 wt% of the confined g-C 3 N 4 . The improved photocatalytic activity is resulted from the synergistic effects of the high adsorption ability, low aggregation, enhanced quantum size effect, and more exposed active sites. The present study gives new sight on improving the aqueous phase recyclability of the few-layered and high-reactive g–C 3 N 4 –based photocatalysts, and may promote its industrial application process.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Zhi Zhu,Changchang Ma,Kesheng Yu,Ziyang Lu,Zhi Liu,Pengwei Huo,Xu Tang,Yongsheng Yan
In the present study, we constructed the Ce-doped biomass carbon-based mesoporous g-C 3 N 4 photocatalyst via alternanthera philoxeroides griseb growing guide using calcination method. The Ce-C@g-C 3 N 4 exhibited more superior photocatalytic performance for 2-mercaptobenzothiazole (96 %) degrading than that of pure g-C 3 N 4 (39 %) and C@g-C 3 N 4 (60 %). As a consequence, the improved degradation efficiency of Ce-C@g-C 3 N 4 attributed to the biomass carbon can significantly enhance the mass transport channels of electron-hole pairs. Meanwhile, the doped Ce 4+ ions acting as the redox center can sufficiently utilize the photogenerated carriers for generating more active radicals. Also, the possible photocatalytic reaction mechanisms including transfer behaviors of charge carriers, generation of reactive species, intermediate degradation products are also discussed in detail. This work may provide a promising approach for synthesizing g-C 3 N 4 -based photocatalyst by the plant growing guide and application in wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenhua Tang,Ying Tian,BoWen Chen,Yayan Xu,Bingpeng Li,Xufeng Jing,Junjie Zhang,Shiqing Xu
The N-deficient porous g-C3N4 with broadband white light emission was constructed by supramolecular copolymerization design, which combined organic copolymers cyanuric acid and 2,4,6-triaminopyrimidine with melamine upon the mixture gas environment of (95%)N2/(5%)H2. Herein, we achieved great breakthrough in narrowing the band gap of g-C3N4 from 2.64 to 1.39 eV. Furthermore, in contrast to pristine g-C3N4, we demonstrated that the emission wavelengths of N-deficient porous g-C3N4 can be tuned from narrow blue to broadband white range, where the optimal white light coordinate position is (0.297, 0.345). The prepared N-deficient porous g-C3N4 overcomes the limitation of the narrow adjusting range of optical properties while using conventional g-C3N4 and makes it more promising for applications in solid-state displays.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2019
·Vol. 4
·期 2
·517-523
·
IF 0
Li Meng,Elena V. Ushakova,Zhengjie Zhou,Enshan Liu,Di Li,Ding Zhou,Zhanao Tan,Songnan Qu,Andrey L. Rogach
Sustainable, environment-friendly phosphors produced from cheap and readily available precursor materials using green preparation processes are in high demand for lighting applications. Herein, a composite phosphor comprising carbon dots (CDs) and graphitic carbon nitride (g-C3N4) is prepared on a large scale from citric acid and urea in water, through a green microwave assisted in situ heating method. An optimized CDs@g-C3N4 composite with a 1 wt% loading of CDs shows a strong green emission under 410 nm excitation, with a photoluminescence quantum yield of 62% in the solid state. Using this composite as a phosphor in the color conversion layer, a white light emitting diode with a power efficiency of up to 42 lm W−1 is fabricated.
✓ 已验证
产品关联
DOI
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qiang Guo,Liming Fu,Tao Yan,Wen Tian,Danfeng Ma,Jiaming Li,Yanan Jiang,Xitao Wang
Porous ZnO nanosheets (PNS-ZnO) were prepared by calcining ZnS(en) 0.5 (en = ethylenediamine) nanosheets in air, and g-C 3 N 4 (g-CN) nanofilms were coated on the surface of PNS-ZnO by thermal deposition using bulk g-C 3 N 4 as precursor. Experimental results showed that the graphene-like g-C 3 N 4 could be deposited on the surface of ZnO to form nanocomposites with core/shell structure. After the loading of g-CN, the light absorption and chemical adsorption of CO 2 over PNS-ZnO were improved obviously and the recombination of photogenerated electron and hole was greatly depressed due to the formation of heterojunction between PNS-ZnO and g-CN. All PNS-ZnO@g-CN nanocomposites exhibited much higher photocatalytic activity for CO 2 reduction with H 2 O vapor when compared to pure PNS-ZnO and bulk g-CN. The loading amount of g-CN had significant influence on the light absorption and photocatalytic activity, and PNS-ZnO@g-CN-0.4 exhibited the best photocatalytic performance, for which H 2 , CH 4 and CO production rates of 22.7, 30.5 and 16.8 μmol/g cat /h can be obtained, respectively.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Feng Hou,Jianan Liu,Yanhong Zhang,Chen Zhao,Xudong Xiao,Jinlong Zou,Qi Li,Shan Hu,Hong Wang,Baojiang Jiang
Copper modified carbon nitride (CuCN) was prepared by a hydrothermal self-assembly reaction and following high temperature thermal polymerization process. Finally, the sample exhibits uniform one-dimensional tubular structure. Interestingly, the separation efficiency of electron-hole pair is improved, and more catalytic active sites are exposed due to the special hollow structure. Meanwhile, the presence of copper element narrows its band gap, leading to the enhancement of photocatalytic degradation performance under simulated sunlight. In addition, the effect of CuCN on dehydrogenase activity of activated sludge was determined by TTC reduction method. After adding CuCN-2, the activity of activated sludge reached 0.134 μmol g −1 min −1 , which indicated that the prepared CuCN-2 had good biocompatibility. It is suitable for both photocatalytic process and activated sludge treatment process. Therefore, the combination of photocatalytic technology and activated sludge process can further completely degrade organic pollutants. We found that CuCN could protect the survival and growth of microorganisms in activated sludge, so that the degradation efficiency of CuCN to nitrobenzene could reach 94.4 %. Therefore, CuCN has broad application prospects in photocatalytic-activated sludge combined treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2019
·
IF 4.018
Meng Li,Bo Wang,Xufei An,Zhiyong Li,Hongtao Zhu,Boyang Mao,David G. Calatayud,Tony D. James
A fluorescent sensor for the detection of trithiocyanuric acid (TCA) and Hg 2+ was developed based on competitive interactions: non-covalent stacking between g-C 3 N 4 and TCA vs coordinative interaction between TCA and Hg 2+ . Electrostatic simulations were used to evaluate the interactions and help describe the detection mechanism. Moreover, normalized 2D fluorescence contour plots have been used to understand the fluorescence phenomenon. When TCA was added into a g-C 3 N 4 nanosheet solution free of Hg 2+ , TCA interacted with g-C 3 N 4 nanosheets via hydrogen bonding and π-π interactions, resulting in fluorescence quenching of the g-C 3 N 4 nanosheets. However, upon the addition of Hg 2+ , the fluorescence of the TCA-g-C 3 N 4 nanosheet hybrid system was restored, due to coordination of Hg 2+ with TCA through the S atoms, breaking the TCA-g-C 3 N 4 stacking interaction. Our results provide a new approach for the design of multifunctional nanosensors suitable for the detection of environmental pollutants.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Dongya Li,Yang Xiao,Mengjie Pu,Jie Zan,Shiyu Zuo,Haiming Xu,Dongsheng Xia
The application of sodium percarbonate (SPC) catalyzed by metal-free protonated g-C 3 N 4 under visible light (vis) irradiation was investigated for the first time to stimulate the degradation of methylene blue (MB) and tetracycline hydrochloride (TCH). The catalyst was obtained by using thermal induction polymerization and chemical exfoliation method. The structure and properties of as-synthesized samples were characterized. Moreover, the effects of various factors such as the initial solution pH on MB degradation were also evaluated. Results obtained in the test actively demonstrated that effective degradation of MB was achieved in the protonated g-C 3 N 4 /SPC/Vis system. This system has a wide range of pH application, and the catalyst presents excellent stability. Holes, superoxide anion radical (•O 2 − ) and hydroxyl radical (•OH) were confirmed as the predominant species responsible for MB degradation. The reaction mechanism for MB degradation in the protonated g-C 3 N 4 /SPC/Vis system was proposed according to the characterization of the samples, the free radical quenching tests, and electron paramagnetic resonance (EPR) spectrum analysis.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Jiajie Ye,Anni Li,Tianshu Chu,Xin Pan,Bingfang He
Penicillin G acylase (PGA) from Providencia rettgeri PX04 (PrPGA) was utilized to synthesize β-lactam antibiotics. Poly-lysine supported cross-linked enzyme aggregates (PL-CLEAs) were prepared using PGA. Addition of poly-lysine significantly increased retention of PGA activity in CLEAs, with a decrease in the synthesis/hydrolysis (S/H) ratio. PL-CLEAs with 0.56 mg/mL poly-lysine retained 83% of free PGA activity, and displayed a higher S/H ratio than that of the free enzyme. Both PL-CLEAs and CLEAs exhibited high pH and thermal stabilities . PL-CLEAs possessed the best stability profile, and the lowest α value [( k cat / K m ) Ps /( k cat / K m ) AD ], and was most effective at amoxicillin synthesis. A >94% yield of amoxicillin was achieved using a D-HPGME/6-APA ratio of 1.2:1 (240 mM, 200 mM), with fed-batch addition of D-HPGME. PL-CLEAs displayed excellent operational stability during amoxicillin synthesis. Over 97% of initial conversion was retained after twenty rounds of catalysis. PL-CLEAs exhibited greater potency than CLEAs in practical catalysis, permitting a higher concentration of reactants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 14
·3753-3762
·
IF 5.726
Xianliang Qiao,Zhiqiang Zhou,Xinyu Liu,Chaoyue Zhao,Qingxin Guan,Wei Li
Graphitic carbon nitride (denoted as “g-C3N4”), as a graphite-like CN material, is widely used in catalysis. In this paper, a fragmentary g-C3N4 framework with a porous structure and rich nitrogen defects was synthesized for acetylene hydrochlorination, using melamine formaldehyde (MF) resin as an oxygen-containing precursor. The fragmentary g-C3N4 shows a highly efficient activity with acetylene conversion reaching 94.5%, which is 30 times higher than that of pure g-C3N4 prepared by direct pyrolysis of melamine. Both experimental and characterization studies by XRD, XPS and TG-MS reveal that the high activity of the catalyst is mainly derived from the porous structure and rich nitrogen defects, which are attributed to the etching of the g-C3N4 framework by oxygen species in the MF resin. Moreover, density functional theory (DFT) calculations demonstrated that the nitrogen defects in the g-C3N4 framework greatly improved the adsorption of HCl and acetylene, and at the same time significantly reduced the energy barrier from 62.0 to 38.1 kcal mol−1 at the rate-determining step.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）