JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 8
·1-12
·
IF 2.8
Yan Xin,Xie Ming,Pan Liangfeng,Ai Tao,Li Zhuo,Niu Yanhui
The recombination of charge carriers in photocatalysts is one of the main factors restricting photocatalytic performance. In this paper, the NaNbO 3 /g-C 3 N 4 heterojunction photocatalyst was prepared by a simple ultrasonic mixing approach and applied to obtain superior piezo-photocatalytic activity. The results showed that the NaNbO 3 nanowires were attached to the g-C 3 N 4 surface for efficient degradation of rhodamine B (RhB). Through the synergistic action of visible-light irradiation and ultrasonic vibration, the RhB solution could be degraded within 30 min by 5% NaNbO 3 /g-C 3 N 4 heterojunction. The reaction rate constant ( k ) of 5% NaNbO 3 /g-C 3 N 4 heterojunction is 2.7 times that of pure g-C 3 N 4 . Moreover, quenching tests and electronic spin resonance (ESR) indicated that ·O 2 − was the primary active species for RhB degradation. The enhanced photocatalytic performance was attributed to the formation of the heterojunction at the NaNbO 3 /g-C 3 N 4 interface. Furthermore, the piezoelectric field that originated from the bending deformation of NaNbO 3 nanowires effectively promoted charge carriers separation efficiency in the NaNbO 3 /g-C 3 N 4 heterojunction.
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Coatings
·
2023
·Vol. 13
·期 3
·655
·
IF 3.4
Yuxin Bai,Shasha Xu,Jing Chen,Xun Sun,Shan Zhao,Jingcai Chang,Zuoli He
Ternary heterojunction photocatalysts can improve the transport and separation of photogenerated electrons and holes, which could promote their reduction and oxidation properties for environmental and energy applications. In this research, the ternary photocatalyst Ti3C2@TiO2/g-C3N4was successfully synthesized via direct electrostatic self-assembly during hydrothermal process. Ti3C2MXene was used to optimize the interfacial carrier transport and separation between the interfaces. The obtained ternary heterostructured photocatalyst had a higher photocatalytic degradation performance for removing rhodamine B (RhB) and 4-chlorophenol (4-CP). The synergistic effect of heterojunction between g-C3N4and TiO2and Schottky barrier presented among TiO2and Ti3C2suppressed the recombination of the photogenerated electron–hole pairs. Moreover, the Ti3C2can serve as an active site for the adsorption and activation of organic pollutants resulting from sufficient functional groups (F−here).Keywords:Ti3C2;g-C3N4;heterojunction;photocatalyst;4-chlorophenol
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanan Liu,Lingchang Jiang,Yuyang Tian,Zhifeng Xu,Wenting Wang,Ming Qiu,Hongmei Wang,Xi Li,Guangshan Zhu,Yangang Wang
Photocatalytic water splitting into H2 is the most economic and environmentally friendly strategy for H2 production, and rationally constructing a heterojunction retains enormous influence on a photocatalytic system. Herein, 2D/2D covalent organic framework/graphitic carbon nitride (COF/CN) van der Waals heterojunctions were readily prepared via an ultrasonic method for high-efficiency visible-light photocatalytic H2 production. The photocatalytic H2 production performance of optimized COF/CN composites can reach up to 449.64 μmol·h–1, which is approximately 5 times that of pure CN (89.08 μmol·h–1). The characterization and experimental studies reveal that the synergistic effect between COF and CN contributes to promoting the interfacial migration and spatial separation of photoinduced e––h+ pairs, further boosting the photocatalytic hydrogen production activity. This work may open a new window to design and fabricate effective heterojunction photocatalysts for photocatalytic energy conversion.
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REVIEWS ON ADVANCED MATERIALS SCIENCE
·
2023
·Vol. 62
·期 1
·
IF 3.6
Yuchen Guan,Zhixin Ren,Yan Lang,Tianze Liu,Zhao Gong,Yuguang Lv
Graphite-carbon nitride (g-C 3 N 4 ) was prepared by thermocondensation, and g-C 3 N 4 /BiVO 4 material (GCB) and g-C 3 N 4 /CNTs composite material (GCC) were prepared by doping different contents of BiVO 4 and carbon nanotubes (CNTs) with g-C 3 N 4 samples, respectively. Then, BiVO 4 , CNTs, and g-C 3 N 4 samples with different contents were doped to prepare ternary composite material (GCBC). In the performance experiment, Sulfamethoxazole (SMZ) was used as degradation material to evaluate the photocatalytic performance of the prepared samples, and the degradation reaction kinetics equation, quadric cycle stability experiment, free radical capture, and intermediates identification were studied. The intermediates of photocatalytic degradation of SMZ were analyzed by high-performance liquid chromatography-mass spectrometry. From the experimental data, it can be seen that for SMZ solution, when the reaction time T = 0 min and retention time rt = 7.53 min, there is a peak corresponding to the substance with m / z [M + H] + of 254, which is judged as SMZ. At 20, 40, and 60 min, rt was 2.00, 7.06, and 9.57 min, indicating the presence of intermediates in the photocatalytic process. Experimental analysis shows that there are three intermediates of SMZ degradation by composite sample GCBC. In this work, three kinds of composite materials were successfully prepared, and a variety of characterization, SMZ as pollutants, test the photocatalytic performance of composite materials (GCB, GCC, and GCBC) samples, and elucidated the cyclic stability of the material, active species capture, and photocatalytic degradation mechanism.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Wan-Ting Lin,Cheng-Ye Zhu,Di Zhou,Wan-Long Li,Ping Fu,Xiao-Jun Huang,Zhi-Kang Xu,Ling-Shu Wan
Thin film nanocomposite membrane with a nanomaterial interlayer (TFNi) has attracted extensive attention in recent years. Herein, for the first time, tannic acid (TA) functionalized g-C 3 N 4 nanosheets are used to construct an interlayer for the fabrication of TFNi nanofiltration membranes with enhanced separation performance. The TA-C 3 N 4 nanosheet interlayers possess high hydrophilicity, low resistance for water transport, and strong structural stability, which is conducive to improving water permeance of the TFNi membranes. Meanwhile, the uniformity of interfacial polymerization on the interlayers is improved by virtue of the smooth surface of the interlayer, enabling the formation of an integral and dense polyamide layer with a thickness of only about 10 nm. The TFNi membranes exhibit excellent performance with water permeance of 34.25 L m −2 h −1 bar −1 and Na 2 SO 4 rejection of 98.53%, which are obviously higher than those of the corresponding membrane without TA-C 3 N 4 nanosheets (21.03 L m −2 h −1 bar −1 and 92.04%). The TFNi membranes also show significant selectivity improvement toward divalent/monovalent ions. This work gives inspiration for designing advanced nanofiltration membranes with functionalized nanomaterials acting as interlayers.
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MOLECULES
·
2023
·Vol. 28
·期 14
·5563
·
IF 4.6
Yayang Wang,Ziyi Liu,Yuesheng Li,Xiaojie Yang,Lingfei Zhao,Jian Peng
The development of a stable and highly active photocatalyst has garnered significant attention in the field of wastewater treatment. In this study, a novel technique involving a facile stirring method was devised to fabricate an array of g-C3N4/ZnO nanowire (ZnO NW) composites. Through the introduction of g-C3N4to augment the generation of electron-hole pairs upon exposure to light, the catalytic efficacy of these composites was found to surpass that of the pristine ZnO NWs when subjected to simulated sunlight. The photocatalytic performance of a 20 mg·L−1methylene blue solution was found to be highest when the doping rate was 25 wt%, resulting in a degradation rate of 99.1% after 60 min. The remarkable enhancement in catalytic efficiency can be ascribed to the emergence of a captivating hetero-junction at the interface of g-C3N4and ZnO NWs, characterized by a harmoniously aligned band structure. This alluring arrangement effectively curtailed charge carrier recombination, amplified light absorption, and augmented the distinct surface area, culminating in a notable boost to the photocatalytic prowess. These findings suggest that the strategic engineering of g-C3N4/ZnO NW heterostructures holds tremendous promise as a pioneering avenue for enhancing the efficacy of wastewater treatment methodologies.Keywords:g-C3N4;ZnO NW;heterostructure;photodegradation
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 41
·94112-94125
·
IF 5.8
Zhang Mingyuan,Li Yueyao,Zhou Xiaoying,Wang Liping,Xie Yuke,Hou Chentao
In recent years, wastewater treatment to remove tetracycline hydrochloride (TCH) has received much attention in water treatment problems. ZIF-67/C 3 N 4 composite adsorbent, a nanosheet structured material stacked with MOFs, was prepared by in situ growth method, which has high adsorption activity for tetracycline hydrochloride in wastewater. Comparing the effect of monomeric and composite adsorbents, Z 6 C 2 had the best adsorption effect (206 mg·g −1 ), which was 77.6% higher than that of ZIF-67 (116 mg·g −1 ) and 10.8 times higher than that of C 3 N 4 (19 mg·g −1 ). The structure of ZIF-67 stacked on C 3 N 4 nanosheets has an excellent specific surface area and number of active sites, as well as π-π interactions, electrostatic interactions, and hydrogen bonding interactions between the adsorbent and TCH, which combine to enhance the adsorption performance. The adsorption process is accompanied by a combination of chemisorption, mass transport, and internal diffusion rate-limiting. It was shown that the adsorption process is favorable for monolayer adsorption as well as a heat absorption reaction that proceeds spontaneously. The adsorbent exhibits good stability and adsorption capacity, which may be suitable for efficient and low-cost water purification.
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ChemistrySelect
·
2022
·Vol. 7
·期 40
·e202203024
·
IF 2.307
Xuehui You,Fang Liu,Guofei Jiang,Shuhua Chen,Beiya An,Rongli Cui
Graphical Degradation experiments of TC suggested that SCN/NT-2@PTFE composites showed the best photocatalytic performance under the optimal conditions, the degradation rate of tetracycline reached 99 % after 120 min of irradiation. The preparation of SCN/NT-2@PTFE composite membrane can solve the problem of difficult recovery and secondary contamination of powder catalysts. Herein we synthesized S-g-C 3 N 4 and N−TiO 2 catalysts by hydrothermal and calcination technologies and SCN/NT@PTFE membrane by a vacuum filtration method. The morphology and composition of the synthesized materials were analyzed by different characterization methods (SEM/HRTEM/XRD/XPS/UV-vis et.). The effects of different catalysts, pollutant concentrations, mass of catalyst and pH on the photo-degradation of tetracycline were investigated. The degradation rate of tetracycline by SCN/NT-2@PTFE membrane was as high as 99.9 % after 2 h of illumination. This was mainly because heterogeneous structure between S-g-C 3 N 4 and N−TiO 2 broadened the light absorption range and suppressed the carrier complex. Superoxide radicals (⋅O 2 − ) were proved to play a dominant role in the degradation reaction. After 20 days of stirring in water, the photocatalytic performance of membrane decreased slightly, demonstrating its good stability. The study of SCN/NT-2@PTFE membrane provides a new direction for the development of photocatalysis and membrane.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Xujia You,Limei Wu,Deqiang Wang,Zhichao Xue,Mingyu Zhao,Xiaolong Wang,Qingxin Liu,Ning Tang
Due to the good photocatalytic performance, which ensures the decomposition of pollutants under light, g-C3N4 is considered as an ideal photocatalytic material. Montmorillonite has a high adsorption capacity and layered structure, which has positive effects on increasing the specific surface area of g-C3N4 and avoid its polymerization agglomeration. In this paper, montmorillonite was used as carrier for g-C3N4 to obtain a new photocatalytic composite g-C3N4/Mt. Then the morphological and (micro)structural properties were characterized. The well-characterized materials were evaluated for the photocatalytic activity in degradation of methylene blue and Bisphenol A. The effects of the mass fraction of g-C3N4, light irradiation time, and pollutant concentration on the photocatalytic performance of g-C3N4/Mt composites were studied. Under the optimal experimental plan, the rate of photocatalytic degradation can reach to 99.3% within 120 min. Through the MS spectrum, it can be found that methylene blue molecule were catalysed and degraded into many harmless substances with low-molecular weight. Finally, based on the obtained reaction products, the mechanism by which the pollutants are removed was proposed. This study provides a new strategy to improve the photocatalysis ability of g-C3N4, which is of great significance for a sustainable pollution treatment.
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ECS Journal of Solid State Science and Technology
·
2022
·Vol. 11
·期 4
·047001
·
IF 2.483
Junyuan Feng,Xiaohui Chen,Xinlin Shi,Weidong Zheng,Xiaofang Zhang,Haipeng Yang
Sarcosine has been shown to be a new biomarker for prostate cancer that is superior to prostate-specific antigen (PSA). By detecting the concentration of sarcosine in the human body, accurate screening and diagnosis of prostate cancer can be achieved in clinical practice. However, the sarcosine level is extremely low in human serum or urine, and accurate detection of sarcosine concentration is difficult. More work is needed to prepare sarcosine biosensors with good anti-interference performance. In this work, we prepared a sarcosine biosensor using a highly electrocatalytically active nanocomposite comprising platinum/carbon nitride (Pt/g-C3N4) as the electrode modification material. The porous lamellar graphite phase carbon nitride (g-C3N4) prevents the agglomeration of Pt nanoparticles and keeps the Pt nanoparticles in a highly dispersed state. The constructed sarcosine biosensor achieves high sensitivity and can selectively detect low concentrations of sarcosine. Its linear detection range is 2–70 μM, and the limit of detection (LOD) is 0.8 μM (S/N = 3). The prepared sarcosine biosensor shows relatively good performance in terms of resistance to interference caused by electroactive substances and provides the potential to be applied in serum for accurate detection of sarcosine.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Di Xie,Shuo Zhang,Tianyu Wu,Mei He,Yiyan Cai,Panpan Zhao,Fangchao Cheng
The MnFe 2 O 4 /g-C 3 N 4 composites with promising photocatalytic activity were successfully prepared in this study. The structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and the photocatalytic activity was evaluated through the degradation of rhodamine B (RhB). It was found that the composites with 30 wt% MnFe 2 O 4 possessed 2.64 times higher photocatalytic activity than that of pure g-C 3 N 4 , and the degradation rate of 30 mg/L RhB solution could reach 97.2% in 90 min under 1 sun irradiation. The promising photocatalytic activity of the composites was mainly attributed to excellent adsorption performance and light absorption capacity of the sample. Simultaneously, the recombination of photogenerated electron-hole pairs was delayed due to the formation of heterojunction between MnFe 2 O 4 and g-C 3 N 4 , and MnFe 2 O 4 /g-C 3 N 4 showed almost no decrease in photocatalytic activity after recycling for five times.
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Materials
·
2023
·Vol. 16
·期 10
·3879
·
IF 3.4
Yelin Dai,Ziyi Feng,Kang Zhong,Jianfeng Tian,Guanyu Wu,Qing Liu,Zhaolong Wang,Yingjie Hua,Jinyuan Liu,Hui Xu,Xingwang Zhu
Water pollution is a significant social issue that endangers human health. The technology for the photocatalytic degradation of organic pollutants in water can directly utilize solar energy and has a promising future. A novel Co3O4/g-C3N4type-II heterojunction material was prepared by hydrothermal and calcination strategies and used for the economical photocatalytic degradation of rhodamine B (RhB) in water. Benefitting the development of type-II heterojunction structure, the separation and transfer of photogenerated electrons and holes in 5% Co3O4/g-C3N4photocatalyst was accelerated, leading to a degradation rate 5.8 times higher than that of pure g-C3N4. The radical capturing experiments and ESR spectra indicated that the main active species are •O2−and h+. This work will provide possible routes for exploring catalysts with potential for photocatalytic applications.Keywords:photocatalyst;type-II heterojunction;carrier separation;photodegradation
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