Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Linfa Bao,Jingjing Han,Huifang Wang,Renrong Liu,Muqing Qiu,Baowei Hu
In this study, a novel synergistic photocatalyst (Fe 3 O 4 /GO/g-C 3 N 4 composites) were constructed by chemical precipitation of Fe 3 O 4 nanoparticles on surface of GO/g-C 3 N 4 suspension. The characterization results indicated that Fe 3 O 4 /GO/g-C 3 N 4 composites exhibited high efficient separation of photogenerated electron–hole pair, narrow bandgap (∼2.38 eV) and wide absorption range. The incorporation of Fe 3 O 4 significantly increased the photocatalytic performance of GO/g-C 3 N 4 composites due to synergistic effect. More than 90% of U(VI) was photo-reduced by Fe 3 O 4 /GO/g-C 3 N 4 composites within 2 h under visible light irradiation. The trapping experiments and XPS analysis indicated that the photogenerated electrons and superoxide ( ⋅ O 2 ) radicals are responsible for U(VI) removal. These findings indicated that magnetic g-C 3 N 4 composites can be used as excellent candidates for the high efficient removal of U(VI) in actual environmental cleanup.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 11
·5176-5187
·
IF 3.925
Yuzhen Li,Shaojie Wang,Yunsheng Xia,Lizhen Gao
A series of Z-scheme CuSnO3/g-C3N4 heterojunctions were synthesized by a precipitation–calcination method. Morphological features, chemical composition, optical properties and crystallographic information of the prepared materials were obtained using scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV–Vis diffuse reflection spectroscopy (UV-Vis DRS), and photoluminescence spectroscopy (PL). The as-fabricated catalysts assisted by H2O2 showed remarkably enhanced photocatalytic performance for the degradation of tetracycline (TC) under visible light irradiation. The 20 wt% CuSnO3/g-C3N4 composite exhibited the highest photocatalytic degradation activity, which could be up to 93.6% at 60 min for the degradation of TC under visible light irradiation. Reactive species scavenging experiments revealed that superoxide radicals were the main active species during the photocatalytic process. This work will be useful for the design of other direct Z-scheme photocatalytic systems for applications in energy conversion and environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
ECOTOXICOLOGY
·
2022
·Vol. 31
·期 3
·503-515
·
IF 2.935
Hu Xuemei,Peng Kuan,Chen Yijun,Chen Xiaoyong,Liu Shuguang,Zhao Yunlin,Wu Yaohui,Xu Zhenggang
Photocatalysts have been widely prepared and used in wastewater treatment. Although the influence of photocatalyst application on survival and activity of organisms has been examined, its impact on composition and diversity of microbial community is not fully understood. In this study, the impact of photocatalyst g-C 3 N 4 (Graphitic carbon nitride) on microbial communities in riverbed sediments polluted by antibiotic tetracycline (TC) was investigated. The sediment samples collected from the Xiangjiang River of China were exposed to different concentrations of TC, g-C 3 N 4 and TC/g-C 3 N 4 and the bacterial community were analyzed by Illumina sequencing. The results showed that the dominant bacterial phyla were Acidobacteriota, Proteobacteria, Actinobacteriota , and Chloroflexi in the study site. When compared to the control treatments, the application of TC, g-C 3 N 4 and TC/g-C 3 N 4 exhibited distinguishable effects on bacterial community structure in sediments. The presence of TC had greater influence on bacterial composition, while g-C 3 N 4 and TC/g-C 3 N 4 had less influence on bacteria. The diversity and richness of microorganisms in sediment increased under g-C 3 N 4 application and reached the highest values when g-C 3 N 4 was 75 mg/kg. The photocatalyst g-C 3 N 4 restored bacterial community diversity affected by TC, reduced the TC residues in aquatic environment, and eliminated the side effects of TC application in sediments. Our study indicated that g-C 3 N 4 was an environmentally friendly photocatalyst with lightly negative effects on microbial community in riverbed sediments, and could be used for effective remediation of TC-contaminated environments.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Shirong Kang,Hao Zhang,Mingyu Dou,Gaimei Gao,Hongjie Zhu,Hua Yang,Dacheng Li,Jianmin Dou
The heterojunction structure with CdS@g-C 3 N 4 photocatalyst was obtained via a simple microthermal chemical in-situ deposition method. The catalyst CdS@g-C 3 N 4 (weight ratio of 1:3) maintained excellent degradation activity to 10 ppm tetracycline (TC) after four cycles due to Z-scheme electron transport mechanism, which was demonstrated through several methods, and the photo-corrosion of CdS was inhibited successfully own to this electron transfer paths. Microscope images showed CdS nanoparticles were uniformly distributed on g-C 3 N 4 nanosheets , such surface morphology provided numerous active sites and excellent adsorption performance for photodegradation process. Mechanism study demonstrated the high energy active species including h + , •O 2 − and •OH take part in the degradation process. Through the mass spectrometry analysis , intermediate products and degradation pathway were inferred on TC during photodegradation process. In addition, this study proved the extremely low toxicity of TC aqueous solution after degradation, there was special significance for ecological and environmental protection. This work provided a reference for the design of the Z-scheme photocatalyst and synthesis of catalysts at low temperature (80 °C), and it has application potential in the treatment of water pollution.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yang Li,Qiao Yin,Yingshan Zeng,Zhi Liu
The core of realizing the effective CO 2 conversion by solar energy is to develop a stable photocatalyst with high CO 2 adsorption capacity and high charge separation efficiency. In this work, a hollow spherical Z-scheme SnS 2 /g-C 3 N 4 /C (SCC) photocatalyst is successfully constructed by a morphology-inherited strategy. Biomass mabospores are utilized as both the precursor for formation of hollow spherical structure and carbon source, and the g-C 3 N 4 and SnS 2 nanosheets tightly anchor on the surface of mabospores-derived carbon spheres. The Z-scheme SCC heterostructure exhibits 5.5 times activity enhancement on CO 2 photoreduction to CO with a high evolution rate up to 40.86 μmol∙g −1 ∙h −1 . Examined by various photoelectrochemical analysis, the boosted photocatalytic activity originates mainly from the construction of hollow spherical Z-scheme heterojunction, providing the more preferable basic sites for CO 2 adsorption, promoting the separation efficiency of electron-hole pairs, as well as increasing the reductionability of electrons in conduction band of g-C 3 N 4 . The formed internal electric fields between the g-C 3 N 4 and SnS 2 can also further reinforce the spatial separation of photogenerated charge carriers. Theoretical calculations further verify that the SCC Z-scheme heterostructure can effectively decrease the energy barriers of formed intermediates, especially the crucial COOH*, and thus leading to the facile conversion of CO 2 -to-CO. This work induces a new strategy to construct g-C 3 N 4 -based Z-scheme heterojunction assisted by versatile biomasses with optimized structure and enhanced photoelectrochemical merits for efficient CO 2 conversion into chemical fuels.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yaxi Tian,Yan Gao,Qiongqiong Wang,Zhaojin Wang,Rongfeng Guan,Wenyan Shi
Graphitic carbon nitride (g-C 3 N 4 ) photocatalysts are used to achieve photocatalytic activity under visible light, but they suffer from an unprecedented bottleneck period. These photocatalysts have many intrinsic shortcomings, such as their small specific surface area and inefficient separation rate of photogenerated electron-hole pairs. Therefore, changing the morphology and structure of g-C 3 N 4 are essential challenges in addressing these shortcomings. Herein, we propose a novel one-pot method for constructing porous ultrathin g-C 3 N 4 nanosheets . Melamine and potassium gluconate were effectively combined via a supramolecular assembly strategy. As a gas template, potassium gluconate decomposes to produce CO 2 at high temperature. This novel potassium gluconate-cooperative pore generation on g-C 3 N 4 nanosheets method is proposed for the first time. As a result, the PCN-1.4 (the optimum sample of porous ultrathin g-C 3 N 4 nanosheets) photocatalyst has a large surface and a porous layer structure (67.95 m 2 g −1 , 0.3594 cm 3 g −1 ) with abundant nitrogen defects. Furthermore, the porous ultrathin g-C 3 N 4 nanosheets prepared by this method not only have good performance in hydrogen production , but also in TC degradation. On the one hand, the PCN-1.4 sample exhibits an excellent hydrogen production efficiency (2323 μmol.g −1 h −1 ) that is 12 times that of bulk g-C 3 N 4 (192 μmol g −1 h −1 ). On the other hand, compared to the tetracycline hydrochloride degradation efficiency of bulk g-C 3 N 4 of 22 %, PCN-1.4 exhibits a higher degradation rate as high as 83 %. In summary, a new pathway for the generative pore-making is provided to prepare other porous materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Wenjing Wang,Xin Xin,Ke An,Yao Chen,Zhanfeng Zhao,Jiangdan Tan,Dong Yang,Zhongyi Jiang
Graphite carbon nitride (g-C 3 N 4 ) has a huge application potential in the photocatalysis field due to its unique conjugated structure. Inspired by the mussel adhesion protein, the cPTA/CNT/CNU (cPTA, carbonized poly(tannic acid); CNT, g-C 3 N 4 prepared by thiourea); CNU, g-C 3 N 4 prepared by urea) nanorod was synthesized by using PTA as the adhesive and template, and thiourea and urea as g-C 3 N 4 precursors. The CNT/CNU isotype heterojunction is assembled on the surface of porous cPTA nanorod, which effectively solves the problem of high photogenerated electron-hole recombination of pure g-C 3 N 4 . The optimal cPTA/CNT/CNU photocatalyst can degrade 95% of rhodamine B (RhB) within 1 h under visible light, which is much higher than CNT, CNU and CNT/CNU. With the conduction band potential difference of cPTA, CNT and CNU, a multistep electron transfer path forms in the cPTA/CNT/CNU, which can accelerate the electron transfer through the interface, thereby increasing the photocatalytic activity.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Yi Wu,Keren Lu,Fubin Pei,Yanghao Yan,Shasha Feng,Qingli Hao,Mingzhu Xia,Wu Lei
The wide clinical application of d -penicillamine (D-PA) makes it inevitably accumulates in the environment, seriously threatening human health and the ecological environment. To better supervisory control D-PA, a highly sensitive and reliable photoelectrochemical (PEC) sensor based on gold nanoparticles (Au NPs) loaded on graphitic carbon nitride sheet and hexagonal NH 2 -UiO-66 composite (g-C 3 N 4 /Au/NH 2 -UiO-66) was synthesized. Tactfully using the strong bonding between D-PA and Au NPs and the effective carrier separation of Z-scheme heterojunction, the designed g-C 3 N 4 /Au/NH 2 -UiO-66 PEC sensor without an extra recognition unit exhibited a selective and sensitive photocurrent to D-PA. With the aid of UV diffuse reflectance spectra (UV-DRs), electron paramagnetic resonance (EPR) characterization, and free radical capture experiments, the electron transfer path of the PEC sensing system was deduced. The proposed g-C 3 N 4 /Au/NH 2 -UiO-66 PEC-based sensor achieved a low detection limit of 0.0046 μM (S/N = 3) with a wide linear response ranging from 10 nM to 400 μM. In addition, its good stability and selectivity also laid a good foundation for practical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yang Huang,Xi Luo,Yini Du,Yu Fu,Xujing Guo,Changwu Zou,Yue Wu
The Fenton-like process provides a promising method to produce reactive radicals for the degradation of refractory organic pollutants in environmental remediation. In this study, the iron-doped g-C 3 N 4 (CNF) coupled with H 2 O 2 was applied to enhance the degradation of carbamazepine (CBZ). And the role of CNF was elucidated by experiment and density functional theory (DFT) calculations. The largest CBZ removal efficiency of 99.02% was achieved in acid condition (pH = 3) with the addition of 0.5 g/L 14% CNF and 50 mM H 2 O 2 . Thirteen intermediates were identified based on high performance liquid chromatography coupled with mass spectrometer (LCMS) and DFT calculations. The degradation products of CBZ were mainly protein-like materials with a low humification degree. During the degradation process, H 2 O 2 was preferentially adsorbed on the active Fe-O site of CNF by hydrogen bonding, hence the promoted electron transfer from H 2 O 2 to Fe(III) contributed to the generation of Fe(II). Certain deformation of H 2 O 2 was observed that the O-O bond length increased to about 1.51 Å. As a result, large amounts of radical species (·OH) were generated by H 2 O 2 decomposition, which was responsible for attacking the CBZ molecules and proceeding the degradation reaction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 5
·1431-1440
·
IF 2.523
Zhang Shixian,Rong Xinshan,Sun Ting,Gao Ping,Liu Jun,Qiu Xuchun,Zhou Xiangtong,Wu Zhiren
An energy-efficient and environmentally friendly nitrogen fixation process is urgently needed to solve problems of high energy consumption and high emissions in the traditional ammonia industry. In this work, a Z-scheme porous g-C 3 N 4 /ZnFe 2 O 4 photocatalyst was synthesized, characterized and employed for N 2 photofixation. Temperature programmed desorption characterization confirmed that the adsorption capacity of nitrogen was improved for the porous structure. From N 2 photofixation evaluation experiments, the highest ammonia production efficiency can reach 147.33 μmol/L within 120 min. Photocatalytic performance is greatly improved because of the increasing of specific surface areas, enhancement of N 2 adsorption ability and synergistic effect of Z-scheme photocatalytic system. In the ammonia production process of the research, visible light is used as energy; N 2 and H 2 O are used as raw materials, which possesses a good application potential due to the advantages of being energy-efficient, environmentally friendly and pollution-free.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 28
·5141-5148
·
IF 3.756
Yan Ma,Dianjun Chi,Yuping Tao,Shengjun Liu,Lei Dong,Yu Chen,Lifang He,Kui Zhang
Catalysts with low cost, high efficiency, and no need for precious metal cocatalysts are the key to realizing the maximum utilization of solar energy-efficient hydrogen (H2) production. In this study, a series of graphitic carbon nitride-derived catalysts (g-C3N4/CoP@C) were successfully obtained by in situ phosphating of g-C3N4/Co-BDC. A CoP@C cocatalyst developed with Co-BDC nanosheets as precursors can accelerate the H2 generation of g-C3N4. The close interface between CoP@C and g-C3N4 increased the electron–hole separation efficiency. Moreover, the CoP@C surface carbon accelerated electron transfer and increased the light absorption range. The prepared g-C3N4/CoP@C composite material exhibited H2 production capability up to 1968 μmol g−1 (3 h), approximately 129.9 times that of g-C3N4. Therefore, the CoP@C cocatalyst is proposed as an alternative to non-precious metal cocatalysts based on the findings of the study.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Chong Liang,Mingyu Cui,Wei Zhao,Linyang Dong,Shangshang Ma,Xutang Liu,Dingkai Wang,Zhijie Jiang,Fei Wang
Photocatalytic technology has been considered as a promising method to alleviate environmental pollution owing to the dual characteristics of redox. The novel V-based H 5 PMo 10 V 2 O 40 (HPA-2) photocatalyst with Z-scheme heterostructure was constructed. The energy level of HPA-2 matches well with CdS and g-C 3 N 4 (CN) according to Mott-Schottky and UV–Vis diffused reflectance tests, which allows the efficient separation of photogenerated electrons. The optimized CdS/HPA-2/CN showed superior ability in Rhodamine B (RhB) degradation and reduction of Cr (Ⅵ) under visible light irradiation. The maximum rate constant reached 0.092 min −1 for RhB degradation at 60 min and 0.260 min −1 for Cr (Ⅵ) reduction at 20 min, respectively. The photocatalytic mechanism was analyzed by adding scavengers. The effect of active species for RhB degradation was determined as h + > ·O 2 − > ·OH, while ·O 2 − and e − were essential for the reduction of Cr (Ⅵ). Besides, cyclic tests exhibit excellent repeatability and stable structure of CdS/HPA-2/CN after four cycles. Meanwhile, the detailed degradation process of RhB involving de-ethylation, hydroxylation, substitution and decarboxylation was determined according to LC-MS and evaluated by Fukui function calculation. Furthermore, total organic carbon content decreased to 6.2% of the initial value. In this work, as an electron mediator, HPA-2 provides the inspiration for construction of Z-scheme heterojunction , and CdS/HPA-2/CN exhibits enormous potential in the environmental remediation by photocatalysis .
✓ 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）