JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 103
·期 3
·876-889
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IF 2.606
Luo Qiuzi,Sun Yihua,Lv Xin,Huang Long,Fang Liang,Wang Rui
Al and Ga were co-doped into ZnO lattice (AGZ) by the sol–gel method. Herein, graphite carbon nitride (g-C 3 N 4 ) was synthesized by using the thermal decomposition method, which was used to integrate with the obtained AGZ to create direct Z-scheme Al/Ga co-doping biphasic ZnO/g-C 3 N 4 heterojunction by the simple single-phase dispersion method. The synthesized catalysts of composition, optical properties, topography structure and chemical state of element of the prepared AGZ/g-C 3 N 4 composites were analyzed by XRD, FT-IR, UV, PL, TEM and XPS respectively. The results have shown that the combination of AGZ and g-C 3 N 4 to form a direct Z-type heterojunction can effectively reduce the band gap of AGZ, thereby shifting the absorption edge to the visible light region. The PL spectroscopy study of the synthesized sample found that, compared with bare g-C 3 N 4 or AGZ catalyst, AGZ/g-C 3 N 4 significantly reduced the recombination of photogenerated electrons and holes, thereby ensuring that more reactive groups participate in the dye degradation process. The degradation experiment of methylene blue(MB) dye verifies that the AGZ/CN sample has excellent photocatalytic performance. Al/Ga co-doped ZnO/g-C 3 N 4 catalyst showed the maximum photocatalytic MB degradation of 95.4% after 150 min in visible light illumination, while the degradation efficiency of ZnO and g-C 3 N 4 are only 30.5% and 50.1%, respectively. It have observed that ·O 2 − , ·OH and h + radicals were the main active species that affect the photocatalytic degradation of dyes by radical trapping experiment. In addition, the heterojunction formed by AGZ and g-C 3 N 4 inhibited the photocorrosion of ZnO, which was confirmed by these five consecutive dye degradation tests. At the same time, in order to determine the optimal compounding ratio, four groups of AGZ/CN with different ratios were prepared. It was found that AGZ/CN15 has the highest catalytic efficiency, and the degradation of MB reached 94% within 2.5 h. This work will open up a new path for the development of more effective photocatalysts for organic matter treatment.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Jingxuan Pei,Yibo Sun,Xiang Yu,Zhenfei Tian,Shuting Zhang,Songbo Wei,Yanfang Zhao,Rabah Boukherroub
Development of reliable sensing strategy combining surface-enhanced Raman scattering (SERS) and surface-assisted laser desorption/ionization-mass spectrometry (SALDI-MS) is of significant interest to distinguish cysteine enantiomers in body fluid for understanding their physiological roles and toxicity hazards. In this work, a SERS/SALDI-MS dual-mode sensing platform of gold nanoparticles (Au NPs) decorated holey carbon nitride (hg-C 3 N 4 ) was fabricated for sensitive detecting cysteine. The designed Au@hg-C 3 N 4 matrix featured a uniform distribution of Au NPs with the help of anchoring effect of hg-C 3 N 4 holey structure, which was conducive to produce highly repeatable signals. Moreover, the combination of Au NPs and holey g-C 3 N 4 endowed this matrix with superior enrichment capacity, enhanced charge transfer and strong UV absorption. These merits allowed the matrix to acquire high sensitivity and enhanced reproducibility for l -cysteine by means of SERS/SALDI-MS. Likewise, reliable detection of l -cysteine and efficient recognition of d -cysteine in human serum jointly revealed its prospect for detecting cysteine enantiomers in body fluids. This work offers a reliable SERS/SALDI-MS strategy for determining L/D-cysteine enantiomers, and the designed Au@hg-C 3 N 4 matrix becomes a potential application candidate for selective detection of bio-enantiomers.
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Nano Energy
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2022
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IF 19.069
Feng Lin,Shuang Zhou,Guohong Wang,Juan Wang,Tengyuan Gao,Yaorong Su,Ching-Ping Wong
g-C 3 N 4 (CN) has been widely explored as a visible light photocatalyst . Nevertheless, the low structural ordering of CN suffers from high-density defects that resulting in poor charge separation efficiency. Therefore, increasing the crystallinity of CN is considered to be an efficient approach to enhance its photocatalytic activity . However, crystalline g-C 3 N 4 (CCN) synthesized via ionothermal method exhibits one-dimensional (1D) nanorod structure and is prone to agglomerate due to its high surface energy, giving rise to unsatisfactory performance improvement. Herein, the 1D carbon nanofibers/crystalline g-C 3 N 4 heterojunction photocatalyst (CNF/CCN) is obtained through electrostatic self-assembly combined with microwave heating strategy. The CNF/CCN sample shows an enhanced photocatalytic H 2 evolution rate (HER) of 6398 µmol g −1 h −1 , which is up to 16.0 and 2.6 times of CN and CCN, respectively. The enhanced HER performance of CNF/CCN is attributed to the improved crystallinity of CN, promoted visible light utilization, large specific surface area and efficient charge transfer across the interface between CNF and CCN. This work conveys a simple and general method for crystallinity and activity enhancement for a wide range application of CN.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Meng Qiao,Lujing Fu,Damia Barcelo
Polycyclic aromatic hydrocarbons (PAHs) ubiquitously exist in aqueous environment , posing considerable chronic and acute ecological risk to aquatic species. Non-metallic photocatalyst g-C 3 N 4 is a promising photocatalyst that can be used in river remediation under visible light irradiation. The removal of a typical PAH phenanthrene (PHE) by g-C 3 N 4 under visible light was detailed studied. The removal efficiency of PHE (initial concentration 5 mg/L) by g-C 3 N 4 -nano sheet (NS) (1 g/L) reached 100% within 10 min under visible light. Reactive oxygenated species, including •O 2 - , 1 O 2 , and •OH, were generated in the g-C 3 N 4 -NS/visible light system. •O 2 - and 1 O 2 were determined as the main active species , whereas photoelectric-hole and •OH were also involved in the reaction. The effects of co-existed substances were investigated, including humic acid (HA), Cl - , and NO 3 - . HA decreased the removal rate of PHE, probably due to its reaction with photo-generated holes. Cl - with lower concentration (0.2 – 10.0 mmol/L) decreased the removal rate of PHE, while with higher concentration (20 mmol/L) increased the removal rate of PHE, probably because of the interaction of Cl - with •OH. NO 3 - with the concentration of 10–100 μmol/L did not significantly affect the removal rate of PHE. This study will provide a possible in-situ route for the removal of typical PAHs in urban river environment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jinming Chen,Powei Gu,Yuting Guan,Haifeng Su
Herein, an effective solid-state pyrolysis method was employed to synthesize CeO 2 (Ce)/biomass carbon(C)@g-C 3 N 4 photocatalyst , which was then used to degrade methylene blue (MB) with high efficiency under visible light irradiation. After 60 min of visible light irradiation, the MB removal rate of Ce/C@g-C 3 N 4 composite photocatalyst reached 96.8%, while the MB removal rates of CeO 2 and g-C 3 N 4 were only 37.8% and 56.3%, respectively. According to the BET and PL results, the Ce/C@g-C 3 N 4 composite material possesses a specific surface area and a low electron-hole recombination rate. The findings of free radical capture experiments and ESR analysis indicated that electron-holes (h + ) and superoxide radicals (•O 2− ) are the most active groups in photodegradation reactions using Ce/C@g-C 3 N 4 composite. Furthermore, after five consecutive cycles, the photocatalytic activity of the Ce/C@g-C 3 N 4 composite material remained steady. This work provides a facile approach for the fabrication of highly stable Ce/C@g-C 3 N 4 photocatalyst with high photocatalytic activity making it a promising material for the photodegradation of methylene blue under visible-light conditions.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
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IF 8.91
Chengze Yu,Jiaqi Hou,Bin Zhang,Shiqi Liu,Xiangrui Pan,Heng Song,Xiangting Hou,Qinghua Yan,Chengzhi Zhou,Guocheng Liu,Yingjie Zhang,Yanjun Xin
The dual-chamber photoelectrocatalytic (PEC) system possess advantages in the degradation efficiency and processing cost of organic contaminants . In this study, TiO 2 nanotube arrays modified by rGO and g-C 3 N 4 (rGO/g-C 3 N 4 /TNAs) photoelectrodes were successfully prepared. The surface micromorphology , chemical structure, crystal structure, and basic element composition of rGO/g-C 3 N 4 /TNAs photoelectrodes were studied by SEM , FTIR, XRD , Raman, and XPS . UV–vis absorption, photoluminescence (PL) spectra, and photoelectrochemical (PECH) tests were used to explore the photoelectrochemical characteristics of rGO/g-C 3 N 4 /TNAs photoelectrodes. Under simulated sunlight illumination, the dual-chamber PEC system with external bias voltage was used to investigate the degradation of oxytetracycline (OTC) on rGO/g-C 3 N 4 /TNAs photoelectrodes. The results showed that rGO and g-C 3 N 4 were successfully loaded on TNAs, and the separation efficiency of electrons and holes at rGO/g-C 3 N 4 /TNAs photoelectrodes was improved. The light absorption range of rGO/g-C 3 N 4 /TNAs photoelectrodes extends to the visible light region and has better light absorption performance. Compared with the photocatalytic process, when 1.2 V bias voltage was applied, the degradation efficiency of OTC in anode and cathode chambers in PEC were increased by 3.28% and 44.01% within 60 min, respectively. In addition, the anode and cathode chambers have different degradation effects on OTC. Both the external bias voltage and initial pH have significant effects in cathode chamber, but have little effect in photoanode chamber. The fluorescence excitation-emission matrix spectra and liquid chromatography-tandem mass spectrometry showed that there were different intermediates in the degradation process of OTC. This study indicated that for the dual-chamber PEC system, rGO/g-C 3 N 4 /TNAs photoelectrodes exhibited excellent photocatalytic performance and have potential application prospects in water environmental remediation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Qian Li,Jiahui Zhang,Jiayu Zhou,Wang Xu,Zhuowei Cheng,Piet N.L. Lens,Jianmeng Chen,Dongzhi Chen
The effective and economic treatment of chlorobenzenes has become one of the most intractable issues in the field of air pollution control. Herein, a visible-light photocatalysis coupled with biodegradation (VPCB) system was developed by integrating an innovative visible-light responsive TiO 2 /oxygenous groups decorated g-C 3 N 4 (TiO 2 /OCN) with polyurethane carriers immobilized with Ralstonia sp. XZW-1 for chlorobenzene removal. Performance tests showed that light intensity, preparation of the MICs, catalyst dosage and composition of the TiO 2 /OCN cast significant influence on chlorobenzene removal efficiency, with the degradation efficiency, mineralization and dechlorination ratios of VPCB achieving 100%, 35.5%, and 99.4% under the optimal conditions, respectively, outcompeting the sum of visible-light photocatalytic system and biodegradation protocols. Cycling tests further demonstrated the excellent stability of VPCB. Mechanism analysis found that increased reactive sites, improved visible-light harvesting, accelerated charge transfer and separation, and the resulting abundant active species jointly contributed to the enhanced photocatalytic activity of TiO 2 /OCN. Photogenerated holes were most significant active species for chlorobenzene removal, followed by OH and O 2 − radicals. The carriers could effectively protect microorganisms from light illumination and strong oxidizing species, allowing the further microbial metabolism of chlorobenzene photocatalytic oxidation intermediates with good biodegradability, not only greatly promoting the microbial growth and activity, but further enhancing chlorobenzene photocatalytic degradation. Plausible synergistic mechanism for chlorobenzene degradation between photocatalysis and biodegradation was also revealed. Furthermore, the VPCB system constructed presented wide applicability towards various pollutants, and its performance was found closely related with the hydrophobicity of pollutants. This work provided insight into the design and application of the VPCB system for the efficient and economic treatment of refractory pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuhang Zhou,Jiafeng Ding,Wen Yan,Yunjuan Meng,Bingzhi Yu,Teer Wen,Yao Yue,Yuchi Zhong,Hangjun Zhang
Degradation of endocrine disrupting compounds by optimizing advanced oxidation processes is highly feasible, but remains a daunting challenge. In this work, a novel copper and molybdenum co-doped g -C 3 N 4 (Cu/Mo@CN) were successfully synthesized via a simple dip-calcination approach, of which highly dispersed Cu and Mo atom sites were doped in the ring of g -C 3 N 4 . The Cu/Mo@CN catalysts were characterized by XRD, SEM, TEM, XPS, UV–vis DRS analyses, etc. The optimized system of Cu 1 /Mo 3 @CN catalyst in the visible light-persulfate oxidation (Vis + PS + Cu 1 /Mo 3 @CN system) had high photocatalytic activity to remove 97.2 % of bisphenol A (BPA, 5 mg/L) within 60 min. Compared to pure g -C 3 N 4 , Cu/Mo@CN has better visible-light (Vis) response function and narrower band gap (2.58 eV), which are easier to get excited by Vis illuminate. The results showed that reactive oxygen species of SO 4 • − , • OH and • O 2 − could be stably produced to contribute to the BPA degradation in Vis + PS + Cu/Mo@CN systems. Meanwhile, the Cu and Mo elements co-doped in g -C 3 N 4 can also effectively activate PS to promote the production of reactive oxygen substances. In addition, the continuous production of photoelectrons enhanced the cycling of Cu 2+ /Mo 6+ and Cu + /Mo 4+ , which could be further improved the removal efficiency of Vis + PS + Cu/Mo@CN towards BPA. The degradation mechanism of BPA were proposed according to the identification of intermediate products and DFT calculation. Overall, this study provides a viable pathway for BPA abatement in actual wastewater treatment applications.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wenxia Wang,Zhen Li,Han Wang,Hangyu Luo,Zhenbang Meng,Xiaofeng Liu,Lingyu Liu,Weirui Chen,Baosheng Jin,Kai Huang,Ri Chen,Qi He
Dual Z-scheme heterojunction with highly separation efficiency of photoinduced carriers and outstanding redox capability has received considerable attention and hold great promise for environmental remediation. Herein, magnetic dual Z-scheme g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 heterojunction was successfully constructed, and applied as a dual-function photocatalyst for tetracycline (TC) degradation and bacterial inactivation. The optimized g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 heterojunction exhibited excellent photocatalytic capacity for TC degradation with a rate constant of 0.0154 min −1 , which is 2.73, 3.08, and 2.92 times higher compared to that of the g-C 3 N 4 , ZnFe 2 O 4 , and g-C 3 N 4 /ZnFe 2 O 4 , respectively. Impressively, the g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 -1.25 heterojunction displayed satisfying activity within a wider range of pH (3.0–9.0), TC concentration (5–25 mg L −1 ), and with the addition of various anions including Cl - , HCO 3 - , SO 4 2- , and NO 3 - . Meanwhile, 6.5-log of Escherichia coli cells could also be inactivated by g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 -1.25 heterojunction under visible light. Mechanism exploration based on trapping experiment, electron paramagnetic resonance (EPR) analysis, and liquid chromatography-mass spectrometer (LC-MS) indicated that the improved photocatalytic performance resulted from the synergetic effect of semiconductors and constructed dual Z-scheme heterojunction, which significantly promotes charge separation rate and endows strong redox capacity. As expected, the toxicity of TC degradation intermediates was reduced according to the Toxicity estimation analysis based on a quantitative structure activity relationships (QSAR) method. Further, the g-C 3 N 4 /ZnFe 2 O 4 /Ag 2 CO 3 heterojunction also demonstrated magnetic separation property and satisfactory photocatalytic stability even after 4 cycles. This work offers a new perspective on constructing novel magnetic dual Z-scheme heterojunction with dual-function photocatalytic properties and is of significance for water remediation.
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JOURNAL OF MOLECULAR LIQUIDS
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2023
·
IF 6
Xian Li,Weilong Zhang,Xiaojun Wen,Lijun You,Jumei Li
Magnetically separable Fe 3 O 4 /hTiO 2 /g-C 3 N 4 composites were successfully constructed through coating polymethylacrylic acid sacrificial interlayer by the reflux-precipitation polymerization and subsequent TiO 2 outer layer by sol–gel method over magnetic Fe 3 O 4 nanospheres, calcining process and forming composites with g-C 3 N 4 in sequence . The formation mechanism of unique composites was proved by TEM, XPS, VSM, XRD and EDX mapping characterization. Their photocatalytic activity was investigated by the solar photodegradation of organic dyes. The results revealed the photocatalytic performance of Fe 3 O 4 /hTiO 2 /g-C 3 N 4 for degrading methylene blue (95.0 %, 120 min) under simulated sunlight irradiation (Xe lamp, 500 W) was much better than g-C 3 N 4 (71.1 %, 120 min) and Fe 3 O 4 /hTiO 2 (40.3 %, 120 min). The boosted property is presumably ascribed to the synergetic interaction of multiple components and effective separation of the photoproduced electron-hole pairs between g-C 3 N 4 and TiO 2 , which was verified using photocurrent and EIS analysis. On the basis of the scavenging studies of radicals ( h + , •O 2 – and •OH), the mechanism of the boosted photocatalytic performance was put forward. The degradation pathways of methylene blue were also proposed by identifying reaction intermediates produced during photocatalysis. More significantly, the composites presented excellent magnetic responsive property owing to the magnetic Fe 3 O 4 . The superior recyclability was confirmed by cyclical photocatalytic experiments with the help of an external magnet, which is crucial for the sustainable and green application of photocatalysts.
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CORROSION SCIENCE
·
2023
·
IF 8.3
Yiqian Lv,Wenjie Zhao,Yujie Qiang,Jingmao Zhao
Based on high barrier performance, the combination of active/passive self-repairing and early corrosion monitoring functions becomes an ideal anti-corrosion strategy. Abundant surface polar functional groups of carbon quantum dots (CQDs) made of juice helped graphite carbon nitride(g-C 3 N 4 ) compatible with epoxy resin, and effectively improved the barrier property of CQDs@g-C 3 N 4 composites in coatings. In addition, the adsorption of CQDs on metal is the source of the active protective performance of the coating. The fluorescence characteristics of CQDs made it realizable to detect the micro-cracks in coatings. This work provides a meaningful strategy for the design of intelligent protective materials.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
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IF 8.4
Guorui Chang,Sirui Li,Yunqi Wang,Qingxia Ran,Qing Tan,Shuli Gou,Haiying Du,Shuxia Xu
Rapid detection of pesticide residues in vegetables has recently attracted much attention. Herein, a Cu-modified graphitic carbon nitride nanomaterial (Cu-C 3 N 4 ) with peroxidase (POD)-like property was synthesized to construct an enzyme-based colorimetric sensing platform for the detection of organophosphorus pesticides paraoxon . Cu-C 3 N 4 could catalyze H 2 O 2 produced by reaction of acetylcholine with acetylcholinesterase and choline oxidase, and then further oxidized 3,3,5,5-tetramethylbenzidine (TMB) to produce a blue colored product. Presence of organophosphorus pesticide paraoxon (PA) restrained the activity of acetylcholinesterase AChE, triggering a remarkably decreased amount of H 2 O 2 towards TMB oxidation, which led to the inhibition of oxidation reaction. After that, the reaction solutions were freeze-dried in a portable bioactive capsule with addition of trehalose as stabilizer for improved enzymes activities . On the basis of the variation in gray-scale values of blue colored TMB solutions using an application, a smartphone-based 3D printing platform was obtained with a linear range from 100 to 33,000 nM (R 2 = 0.994) and a detection limit of 13 nM (3 σ/k ). This smartphone-based 3D-printed colorimetric platform combined with a bioactive capsule offers a novel approach with the potential for rapid detection of PA in vegetables.
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