SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Benlin Dai,Xin Chen,Xiaofan Yang,Gang Yang,Shijie Li,Lili Zhang,Feihu Mu,Wei Zhao,Dennis Y.C. Leung
A novel S-scheme Au/g-C 3 N 4 /BiO 1.2 I 0.6 plasmonic heterojunction was constructed by calcining a mixture of flower-like BiOI and Au/g-C 3 N 4 nanosheets for the first time. This Au/g-C 3 N 4 /BiO 1.2 I 0.6 heterojunction exhibited excellent photocatalytic activity in bisphenol AF (BPAF) degradation and Cr(VI) reduction with high cycle stability under visible light irradiation. In particular, the photocatalytic performance of the optimum material developed (4-Au/g-C 3 N 4 /BiO 1.2 I 0.6 ) can reach 0.0174 min −1 (apparent rate of BPAF degradation) and 0.0204 min −1 (apparent rate of Cr(VI) reduction), which were 6.5 and 3.7 times that of pristine g-C 3 N 4 , respectively. The high photocatalytic performance was due to the high efficiency of charge separation, the excellent light absorption of localized surface plasmon resonance (LSPR) caused by the Au deposition, and the formation of S-scheme heterojunctions, which maintained strong photocatalytic reduction and oxidation activity. Noticeably, the charge density difference and band offsets of the g-C 3 N 4 /BiO 1.2 I 0.6 were calculated. The results revealed that an internal electric field (IEF) was created, which further demonstrated the formation of an S-scheme photocatalytic mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Shikang Yin,Linlin Sun,Yaju Zhou,Xin Li,Jinze Li,Xianghai Song,Pengwei Huo,Huiqin Wang,Yongsheng Yan
The use of semiconductor photocatalytic reduction technology has higher efficiency and lower energy consumption for CO 2 reduction, but its existence of some mismatched energy band positions and relatively slow charge-hole separation greatly limits its practical application. In this paper, a SnS 2 /Au/g-C 3 N 4 embedded structure model with carbon and nitrogen hybridization is proposed to gain an in-depth understanding of the role of hybridization and precious metal modification in photocatalysis. Carriers were investigated from the perspective of kinetics through photocurrent, LSV curve, and FL spectroscopy. After modification of Au nanoparticles, the photo-excited electrons showed a slower decay process, indicating that the separation of carriers was enhanced, which was further confirmed by impedance and PL spectroscopy. SEM, AFM and TEM analysis confirmed that the 2D face-to-face SnS 2 /Au/g-C 3 N 4 embedded structure was successfully prepared and the Au nanoparticles were evenly distributed. Au nanoparticles not only act as a bridge for electron transport in 2D semiconductor materials to accelerate electron transport, but generate more excited electrons by themselves under the radiation of sunlight, which effectively improves the separation efficiency of electron-hole pairs and enhances the photocatalyst activity. DFT calculations show that the Z-type mechanism and the intercalated energy level of the SnS 2 /Au/g-C 3 N 4 embedded structure expand the light absorption and improve the carrier separation efficiency. As expected, the photocatalyst activity with CO and CH 4 the evolution rate of up 93.81 µmol·g −1 ·h −1 and 74.98 µmol·g −1 ·h −1 under visible light irradiation, respectively, while the photocatalytic activity is negligible loss after 30 h photoreduction. This work reveals the role of embedded structure and precious metal modification in the separation and transmission of electron-hole, opening up new perspective for achieving high-efficiency solar CO 2 reduction performance.
研究领域:
材料科学
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环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Feihu Mu,Jin Huang,Shengpan Xu,Ruiqing Wang,Xiaozhong Chu,Zhipeng Cheng,Xujing Guo,Wei Zhao,Benlin Dai,Wenshuai Zhu
Dissolved organic matter (DOM) in black-odorous water can cause excessive growth of plants and algae, leading to deterioration of water quality. Herein, an S-scheme Au/g-C 3 N 4 /BiVO 4 heterojunction was constructed using a three-step method for DOM degradation in real black-odorous water in the presence of peroxymonosulfate (PMS). 4Au/g-C 3 N 4 /BiVO 4 /PMS exhibited highly efficient photocatalytic performance, and the DOM removal rate could reach 92.9 %, which was 19.1 and 9.9 times higher than that of g-C 3 N 4 /PMS and BiVO 4 /PMS, respectively. The changes of fluorescence components in DOM were detected using synchronous fluorescence spectra and two-dimensional correlated spectroscopy analysis, and the toxicity of catalytically treated black-odorous water was evaluated by growth inhibition of Escherichia coli . A reasonable S-scheme mechanism was suggested by theoretical calculations and photoelectrochemical tests. The S-scheme mechanism and the synergistic effect of photocatalysis and hybrid advanced oxidation process (HAOP) increased the catalytic activity of Au/g-C 3 N 4 /BiVO 4 /PMS.
研究领域:
环境科学
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光催化材料
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 12
·1-11
·
IF 5.833
Wang Xiao,Liao Xiaochen,Zhang Bingjian,Zhang Mengmeng,Mei Lisha,Wang Fangwai,Chen Siyu,Qiao Xiuwen,Hong Chenglin
Abstract Carcinoembryonic antigen levels in the human body reflect the conditions associated with a variety of tumors and can be used for the identification, development, monitoring, and prognosis of lung cancer, colorectal cancer, and breast cancer. In this study, an amperometric immunosensor with CuCo/carbon nanocubes (CuCo/CNC) as the signal label is constructed. The bimetal-doped carbon skeleton structure has a high specific surface area and exhibits good electrocatalytic activity. In addition, Au/g-C 3 N 4 nanosheets (Au/g-C 3 N 4 NSs) are used to modify the substrate platform, facilitating the loading of more capture antibodies. The reaction mechanism was explored through electrochemical methods, X-ray powder diffraction, X-ray photoelectron spectroscopy, and other methods. Kinetic studies have shown that CuCo/CNC have good peroxidase-like activity. In addition, the electrocatalytic reduction ability of CuCo/CNC on hydrogen peroxide can be monitored using amperometric i – t curve (− 0.2 V, vs. SCE), and the response current value is positively correlated with the CEA antigen concentration. The prepared electrochemical immunosensor has good selectivity, precision, and stability. The dynamic range of the sensor was 0.0001–80 ng/mL, and the detection limit was 0.031 pg/mL. In addition, the recovery and relative standard deviation in real serum samples were 97.7–103 % and 3.25–4.13 %, respectively. The results show that the sensor has good analytical capabilities and can provide a new method for the clinical monitoring of CEA. Graphic abstract
研究领域:
生物医学工程
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肿瘤学
·
分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·54964-54975
·
IF 3.289
Jian Zeng,Ting Song,Meixiang Lv,Tingting Wang,Jiayi Qin,Heping Zeng
A Au/g-C3N4/NiFe2O4 nanocomposite was successfully prepared and characterized, and it exhibited a significant visible-light-driven photoactivity for hydrogen production. The results suggested that NiFe2O4 was closely coupled with flake-like g-C3N4 and Au nanoparticles were successfully loaded onto the surface of an optimal g-C3N4/NiFe2O4 nanocomposite. Subsequently, the photocatalytic hydrogen evolution of the as-prepared sample was investigated and optimized, indicating that the optimal Au/g-C3N4/NiFe2O4 ternary nanocomposite with AuNP loading of 1.0 wt% showed the highest hydrogen generation rate of 1.607 mmol g−1 h−1, which was 30.9 times and 28.7 times higher than the values of pure NiFe2O4 and pure g-C3N4, respectively, whereas the optimized g-C3N4/NiFe2O4 binary nanocomposite with NiFe2O4 coupled at 49.4% exhibited a hydrogen generation rate of 0.351 mmol g−1 h−1. Interestingly, the photocatalytic hydrogen production mechanism was also tentatively proposed as promoted charge carrier transfer and the strong surface plasmon resonance (SPR) effect of AuNPs via PL, EIS and photocurrent measurements was verified.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaoming Liu,Suqing Wang,Fang Yang,Yinchu Zhang,Liushui Yan,Kexin Li,Huiqin Guo,Jiajun Yan,Jun Lin
In this paper, a novel Au/g-C 3 N 4 /ZnIn 2 S 4 plasma photocatalyst heterojunction composite with 3D hierarchical microarchitecture has been successfully constructed by integrating Au/g-C 3 N 4 plasmonic photocatalyst composite with 3D ZnIn 2 S 4 nanosheet through a simple hydrothermal process. The Au nanoparticles were firstly anchored on the surface of pristine g-C 3 N 4 material to get Au/g-C 3 N 4 plasmonic photocatalyst. Ascribing to the surface plasmon resonance of Au nanoparticles , the obtained Au/g-C 3 N 4 plasmonic photocatalyst shows a significant improved photocatalytic activity toward hydrogen production from water with visible light response comparing with pristine g-C 3 N 4 . Further combining Au/g-C 3 N 4 plasmonic photocatalyst with 3D ZnIn 2 S 4 nanosheet to construct a heterojunction composite. Owing to the synergistic effect of the surface plasmon resonance of Au nanoparticles in Au/g-C 3 N 4 and the heterojunction structure in the interface of Au/g-C 3 N 4 and ZnIn 2 S 4 , the prepared Au/g-C 3 N 4 /ZnIn 2 S 4 plasma photocatalyst heterojunction composite shows an excellent photocatalytic activity toward hydrogen production from water with visible light response, which is around 7.0 and 6.3 times higher than that of the pristine C 3 N 4 and Znln 2 S 4 nanosheet, respectively. The present work might provide some insights for exploring other efficient heterojunction photocatalysts with excellent properties.
研究领域:
材料科学
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催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Jun-Tao Cao,Yu-Xiang Dong,Yan Ma,Bing Wang,Shu-Hui Ma,Yan-Ming Liu
Photoactive materials with high photo-electron transfer efficiency and stable signal output hold a key role in constructing the photoelectrochemical (PEC) biosensing systems. In this study, the ternary [email protected] 3 N 4 heterojunction was first prepared and characterized, and its application in PEC bioanalysis was explored. The gold nanoparticles sandwiched between CdS and g-C 3 N 4 , acting as both plasmonic photosensitizer and electron relay, significantly boosted the light absorption and accelerated the charge transfer from g-C 3 N 4 to CdS, both of which contributed to the enhancement of photoelectric conversion efficiency. Signal quenching with graphene oxide-CuS efficiently weakened the photocurrent from [email protected] 3 N 4 . The combination of the excellent PEC properties of [email protected] 3 N 4 and the remarkable quenching effects of graphene oxide-CuS enabled construction of a sandwich-type PEC immunosensor for prostate specific antigen (PSA) detection. This immunosensor achieved sensitive PSA analysis by multiple signal amplification mechanisms, with a detection limit of 0.6 pg mL −1 and a wide linear range from 1.0 pg mL −1 to 10 ng mL −1 . This work not only demonstrates the great potential of noble metal sandwiched ternary heterojunctions in the PEC field, but also lays a foundation for developing the general PEC immunoassays .
研究领域:
光电化学
·
生物传感器
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jingjing Xu,Jingyi Wei,Yanying Cui,Sixian Yu,Sufang Guo,Qi An,Ping Han
In this work, an Au/g-C 3 N 4 /GO/Au hybrid nanofilm for surface-enhanced Raman scattering (SERS) substrate application was prepared by a facile layer-by-layer assembly technique using nanosheet-structured graphitic carbon nitride (g-C 3 N 4 ), graphene oxide (GO) and 40 nm-gold nanoparticles (Au NPs). The effects of composition, assembly sequence and assembly cycles on the SERS performance were optimized to achieve the SERS-active substrate. The detection limit of Au/g-C 3 N 4 /GO/Au substrate for crystal violet and rhodamine 6 G probe molecules reached as high as 10 -8 M, with good stability and uniformity. Its further application in food colorants detection (erythrosine, carmine and temptation red) had successfully met the national food safety standards and the quantitative detection for erythrosine and temptation red had also been established. Based on finite-difference time-domain element simulation and density functional theory quantum chemical calculation, the mechanism of the SERS effect of the substrate was unveiled, which is attributed to the combination of electromagnetic enhancement effect of Au nanoparticle aggregates and chemical enhancement effect of GO and g-C 3 N 4 . Notably, water droplet evaporation induced Raman enhancement was observed on the Au/g-C 3 N 4 /GO/Au substrate. This can be ascribed to the inhomogeneous evaporation of the droplet that promotes the enrichment of the probe molecules into the center of the droplet. This novel enhancement strategy provides a new idea for further improving detection sensitivity of SERS substrate materials.
研究领域:
材料科学
·
分析化学
·
表面科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 24
·6372-6383
·
IF 4.495
Wenhua Ye,Jisong Hu,Xiaofeng Hu,Wenhua Zhang,Xinguo Ma,Huihu Wang
Graphical Photocatalysis : The traditional p–n junction charges transfer mode at the interface of CuInS 2 /g-C 3 N 4 can be switched to Z-scheme mode in CuInS 2 /Au/g-C 3 N 4 heterostructure through Au integration by weakening the built-in electric field and improving the interfacial bonding. Two dimensional (2D) heterojunction based on g-C 3 N 4 and CuInS 2 (CIS) nanosheets has been successfully constructed with the assistance of biomolecules L-cysteine. We demonstrated that a typical p–n junction charges transfer mode of CIS/PCN (protonated g-C 3 N 4 ) can be switched to Z-scheme transfer mode through the integration of Au by weakening the role of built-in electric field. The morphology of CIS/Au/PCN can be well adjusted through the formation of Au−S covalent bond and the electrostatic adsorption between Au and PCN during the hydrothermal process. Furthermore, the intimate interface contact inside CIS/Au/PCN heterojunction was indeed constructed, which may promote the charges separation and transfer process at the interface as evidenced by ESR spectra and time-resolved PL spectra. Under visible light illumination, the CIS/Au/PCN exhibited an enhanced CO (19.46 μmol/g) and CH 4 (1.18 μmol/g) yield in CO 2 reduction, which was about 5.04 times and 2.03 times higher than pure PCN. The composite heterojunction also showed excellent photocatalytic activity for tetracycline degradation with a 87 % degradation efficiency in 1 hour, which was 2.07 times higher than pure PCN. The experimental and theoretical calculation results demonstrated that an all-solid-state Z-scheme heterojunction was formed in the CIS/Au/PCN system, which was different from the typical p–n junction charges transfer mechanism in CIS/PCN.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Colloid and Interface Science Communications
·
2022
·
IF 5.633
Zhiying Guo,Fangxu Dai,Huixiang Yin,Mingming Zhang,Jun Xing,Lei Wang
Gold nanoparticles (Au NPs) are widely utilized to broaden the light absorption of the photocatalysts due to their localized surface plasmon resonance (LSPR). However, the photocatalytic mechanism of Au/photocatalyst heterostructure involving charges transfer and reactive sites is still in dispute. Here, we synthesized a typical system Au/graphite carbon nitride (g-C 3 N 4 ) and demonstrate that the role of Au NPs in the LSPR enhanced photocatalysis . Under visible light, the photoexcited electrons of g-C 3 N 4 would transfer to Au NPs and reduce protons into hydrogen together with hot electrons of Au NPs. The hot holes of Au NPs would flow to g-C 3 N 4 and oxidize triethanolamine . Therefore, the Au NPs play a dual role, plasma, and cocatalyst, in the LSPR enhanced photocatalyst. When λ > 420 nm, Au /g-C 3 N 4 has hydrogen production of 159.9 μmol g −1 h −1 . Our findings confirm the significance of metal plasma in photocatalytic reaction and benefit designing photocatalysts with boosting performance.
研究领域:
材料科学
·
光催化
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMATERIALS
·
2016
·
IF 8.387
Zhenzhen Wang,Kai Dong,Zhen Liu,Yan Zhang,Zhaowei Chen,Hanjun Sun,Jinsong Ren,Xiaogang Qu
As common reactive oxygen species, H 2 O 2 is widely used for bacterial inactivation and wound disinfection . However, the concentrations used are always higher than physiological levels , which frequently result in potential toxicity to healthy tissue and even delay wound healing. Here we report highly efficient nanozyme hybrids that are capable of activating biologically relevant concentrations of H 2 O 2 for defending bacterial infections. The integration of AuNPs with ultrathin graphitic carbon nitride (g-C 3 N 4 ) provides excellent peroxidase-activity, which can catalyze the decomposition of H 2 O 2 to OH radicals much more efficiently, allowing the use of bio-safety levels of H 2 O 2 for the first time. Furthermore, our system not only exhibits striking bactericidal performance against both DR Gram-negative and DR Gram-positive bacteria, but also shows high efficiency in breaking down the existing DR-biofilms and prevented formation of new biofilms in vitro. More importantly, in vivo experiments indicate that our system could significantly prevent bacterial infections and accelerate the healing rate of wounds.
研究领域:
生物化学
·
纳米医学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）