JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wisal Muhammad,Nazma Faqir,Muhammad Asif Khan,Zaheen Ullah Khan,Bilal Ahmad,Muhammad Jawad Ahmad,Amir Zada,Fawad Ali,Sajid Nadeem,Muhammad Zaka Ansar,Wajid Ali
Developing an efficient visible-light-driven photocatalysts for conversion of atmospheric CO 2 into valuable fuels is a promising strategy to mitigate the escalating greenhouse gas, environmental, and energy crisis. This study presents an innovative design for a cascade Z-scheme comprising of dimensional matched SnO 2 -α-Fe 2 O 3 /g-C 3 N 4 (SO-FO/CN) nanosheets heterojunction. In this configuration, SnO 2 functions as an optimal energy platform that not only facilitates charge transfer and separation but also sustains sufficient thermodynamic energy for redox reactions and inhibits the undesired type-II charge transfer pathway. The optimized cascade Z-scheme exhibits a remarkable 20-fold improved photoactivity for CO 2 conversion to CH 4 and CO compared to bare g-C 3 N 4 (CN). It also shows significantly improved photocatalytic activity for the degradation of toxic organic pollutants, 2,4-dichlorophenol (2,4-DCP) ∼6.6-fold and bisphenol A (BPA) ∼4.2-fold, respectively. The improved photocatalytic activity results from effective charge separation facilitated by the Z-scheme, along with a favorable energy platform and extended charge lifetime. This innovative strategy, which utilize an energy platform, presents a promising approach for designing an efficient Z-scheme heterojunction photocatalysts for solar-to-fuel conversion and pollutant degradation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaojie Liu,Yong Zhao,Yahui Du,Quanliang Wang,Xin Jing,Liangmin Yu,Mingliang Sun
Conjugated donor (D)–acceptor (A) polymer heterojunctions have developed as attractive photocatalysts. However, it is a great difficulty in precisely keeping the batch-to-batch reproducibility of polymers and controlling the related photocatalytic activity . Herein, three ladder-like small molecules BTx (BT2F, BTORCAE, and BTORIC2Cl) are synthesized via molecular engineering and the corresponding BTx/g-C 3 N 4 heterojunctions are developed as photocatalysts for sterilization and contaminant degradation. It is demonstrated that employing another A unit into the D–A–D backbones of the small molecule could promote its intramolecular charge transfer and also improve the intermolecular charge transfer. Notably, BTORIC2Cl employing 2-(5,6-Dichloro-3-oxo-2,3 dihydro-1H-inden-1-ylidene)malononitrile as A 1 unit in its symmetric A 1 –D–A 2 –D–A 1 structure displays near-infrared absorption and extends the absorption edge of BTORIC2Cl/g-C 3 N 4 to 850 nm. With the synergy of efficient intermolecular charge transfer, BTORIC2Cl/g-C 3 N 4 contributes the champion photocatalytic activity of 98.9 % and 99.6 % antibacterial rates for Staphylococcus aureus and Escherichia coli . Moreover, the highest degradation reaction rate constant for Rhodamine B obtained by BTORIC2Cl/g-C 3 N 4 is 5.7 times that of g-C 3 N 4 . This study proposes new ideas of fabricating small molecules/g-C 3 N 4 OSHJs as photocatalysts via rational molecular engineering.
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Small
·
2020
·Vol. 16
·期 13
·1906880
·
IF 11.459
Weikang Wang,Hongjian Zhou,Yanyan Liu,Shengbo Zhang,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
It is an important issue that exposed active nitrogen atoms (e.g., edge or amino N atoms) in graphitic carbon nitride (g-C 3 N 4 ) could participate in ammonia (NH 3 ) synthesis during the photocatalytic nitrogen reduction reaction (NRR). Herein, the experimental results in this work demonstrate that the exposed active N atoms in g-C 3 N 4 nanosheets can indeed be hydrogenated and contribute to NH 3 synthesis during the visible-light photocatalytic NRR. However, these exposed N atoms can be firmly stabilized through forming B N C coordination by means of B-doping in g-C 3 N 4 nanosheets (BCN) with a B-doping content of 13.8 wt%. Moreover, the formed B N C coordination in g-C 3 N 4 not only effectively enhances the visible-light harvesting and suppresses the recombination of photogenerated carriers in g-C 3 N 4 , but also acts as the catalytic active site for N 2 adsorption, activation, and hydrogenation. Consequently, the as-synthesized BCN exhibits high visible-light-driven photocatalytic NRR activity, affording an NH 3 yield rate of 313.9 µmol g −1 h −1 , nearly 10 times of that for pristine g-C 3 N 4 . This work would be helpful for designing and developing high-efficiency metal-free NRR catalysts for visible-light-driven photocatalytic NH 3 synthesis.
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高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 10
·3822-3827
·
IF 8.262
Fang He,Gang Chen,Yansong Zhou,Yaoguang Yu,Laiquan Li,Sue Hao,Bin Liu
A ZIF-8 derived carbon (C-ZIF)/g-C3N4 composite was constructed for the first time through facile thermal condensation of a zeolitic imidazolate framework (ZIF-8) and melamine. The obtained C-ZIF/g-C3N4 composite exhibited an obviously enhanced photocatalytic H2 production rate compared to pure g-C3N4 under visible light irradiation. The 1 wt% C-ZIF/g-C3N4 composite without loading the Pt co-catalyst showed 36.2 times higher H2 evolution rate than that of pure g-C3N4, which is even 2.8 times higher than that of Pt/g-C3N4 (the state-of-the-art g-C3N4-based photocatalyst). It was revealed by photoluminescence spectroscopy, time-resolved fluorescence spectroscopy and electrochemical impedance spectroscopy that the formed C-ZIF and g-C3N4 junction could promote quick charge carrier separation and transfer. The C-ZIF not only acted as an effective electron acceptor, but also functioned as an efficient hydrogen evolution reaction (HER) cocatalyst to promote photocatalytic hydrogen evolution. Our work provides an effective way for the development of metal-free, all carbon-based photocatalysts for H2 evolution.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Baadal Jushi Janani,Safaa Mohammed Ibrahim,Asad Syed,Morug Salih Mahdi,Abdallah M. Elgorban,Haider Radhi Saud,Manjula Subramaniam,Ling Shing Wong,Ramadan Fallah Amer
In this study, we have designed a nanocomposites based on MXene/g-C 3 N 4 (MX/CN) loaded on Fe 2 WO 6 /BiIO 4 (FWO/BIO) for different applications. The nanocomposites were identified by using the structural and morphological studies including XRD , FESEM, EDS , DLS , TGA , BET, UV–vis, XPS techniques. The average sizes of BIO, FWO/BIO, and MX/CN/FWO/BIO were 44, 46, and 58 nm, respectively. The synthesized MX/CN/FWO/BIO nanocomposites was utilized for the peroxidase colorimetric identification of uranyl ions (UO 2 2+ ) with the excellent selectivity and sensitivity properties (LOD: 3.21 nM). The antifungal efficiency of the as-fabricated nanomaterials was investigated and the inhibition zone at high concentration 2.5 mg/mL of MX/CN/FWO/BIO nanocomposites were 19.74, 17.91, 24.25, and 21.32 mm against Aspergillus spp., Penicillum spp., Candida spp. and Fusarium spp., respectively. The MX/CN/FWO/BIO nanocomposites was utilized in photocatalysis process for decomposition of p-chlorophenol under visible light lamp. The findings showed that the MX/CN/FWO/BIO nanocomposites can be degrade p-chlorophenol (100.0 %) under visible light irradiation (80 min). The photocatalytic response was decreased about 2 % after 5th cycle times, and showed the best stability of the MX/CN/FWO/BIO nanocomposites. The quenching test shows the mechanism of p-chlorophenol degradation was conducted by •O 2 − , and •OH species. Additionally, the ecological structure activity relationships ECOSAR software was utilized to evaluate the toxicity of the p-chlorophenol and the intermediates produced. This work can lead for manufacturing innovation in near future.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Jingqi Tian,Rui Ning,Qian Liu,Abdullah M. Asiri,Abdulrahman O. Al-Youbi,Xuping Sun
Direct mixing of aqueous dispersions of ultrathin g-C3N4 nanosheets and graphene oxide (GO) under ultrasonication leads to three-dimensional (3D) porous supramolecular architecture. Photoreduction of GO yields conductive porous g-C3N4/rGO hybrid. The resulting 3D architecture possesses high surface area, multilevel porous structure, good electrical conductivity, efficient electron transport network, and fast charge transfer kinetics at g-C3N4/rGO interfaces, which facilitate the diffusion of O2, electrolyte, and electrons in the porous frameworks during oxygen reduction reaction (ORR). Ultrathin g-C3N4 nanosheet also causes effective electron tunneling through g-C3N4 barrier, leading to rich electrode–electrolyte–gas three-phase boundaries, and shortens the electron diffusion distance from rGO to O2. As a novel ORR catalyst, such 3D hybrid exhibits remarkable catalytic performance, outperformed other g-C3N4/rGO composites, and exhibits excellent durability.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Dongxue Yu,Yimin Tang,Ziqi Liu,Lihui Hu,Xin Jiang,Bing Zhao,Libin Yang
Developing new-type semiconductor surface-enhanced Raman scattering (SERS) platform with synchronous enhancement of sensitivity and stability is an effective strategy for achieving ultra-sensitive detection of emerging pollutants in various pollution scenarios. In this work, a new g-C 3 N 4-x /N-doped TiO 2-x (g-C 3 N 4-x /N-TiO 2-x ) heterojunction SERS matrix was purposefully developed by a combined strategy of interface engineering and defect engineering. During the formation of heterojunction, “N-bidirectional migration” between two monomers can be achieved (that is, N vacancies and N doping can be generated simultaneously), which achieves a synchronous modulation of the atomic and electronic structures of the heterojunction. This endows g-C 3 N 4-x /N-TiO 2-x with excellent interfacial performance, abundant defect states, as well as ultra-high stability. The enhancement factor of the SERS matrix is as high as 10 9 . Theoretical calculations and experiments reveal the contribution of charge transfer (CT) mechanism to the SERS enhancement. The high-efficiency carrier separation induced by the strong interface coupling effect and the multi-channel CTs mediated by multiple defect states (vacancy defects and doping defects) are jointly responsible for the observed huge SERS enhancement. Benefiting from its high SERS sensitivity (selectivity) and excellent stability, g-C 3 N 4-x /N-TiO 2-x can be applied for ultrasensitive detection of antibiotic pollutants in multiple scenarios, including animal-derived foods such as milk, sour milk and beef, as well as natural water systems such as lake water and seawater. The detection limit of several typical antibiotic residues (enoxacin, ciprofloxacin, sulfamethoxazole and florfenicol) is as low as 1 × 10 −11 mol/L.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shi-Wen Lv,Qiuyu Zheng,Lingjie Ye,Chun-Yang Li,Jing-Min Liu,Yanqing Cong,Shuo Wang
Nowadays, simultaneous removal of organic pollutants and heavy metals from wastewater is still a complicated task with great challenge. Herein, a newly-designed Fe-g-C 3 N 4 /α-Fe 2 O 3 composite with an active N-Fe-O bridge was prepared by coupling Fe-doped g-C 3 N 4 (namely Fe-g-C 3 N 4 ) and α-Fe 2 O 3 . Interestingly, the combination of Fe-g-C 3 N 4 with α-Fe 2 O 3 broadened the light absorption region and restrained the photoinduced electron-hole pair recombination. Meanwhile, elaborate construction of N-Fe-O bridges based on coordination interaction can reduce electrochemical impedance and facilitate electron transfer, thereby prolonging the charge lifetime. As expected, the Fe-g-C 3 N 4 /α-Fe 2 O 3 composite displayed excellent photocatalytic performance in simultaneous removal of tetracycline (TC) and Cr(VI). More importantly, Fe-g-C 3 N 4 /α-Fe 2 O 3 -mediated electron transfer from TC to Cr(VI) also played an essential role on TC oxidation and Cr(VI) reduction under visible light. Both experimental analyses and theoretical calculations revealed that the migration route of photogenerated carriers followed a direct Z-scheme heterojunction mechanism under built-in electric field. The Fe-g-C 3 N 4 /α-Fe 2 O 3 composite with great stability also displayed promising practical application potential. In short, the current work not only provided a highly-efficient photocatalyst with N-Fe-O bridges but also shared new insights into the simultaneous removal of organic pollutants and heavy metals.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yong Yang,Zheng Tang,Baojing Zhou,Jinyou Shen,Huichao He,Amjad Ali,Qin Zhong,Yujie Xiong,Chao Gao,Ahmed Alsaedi,Tasawar Hayat,Xiaoyong Wang,Yong Zhou,Zhigang Zou
An absolute metal-free in-plane heterosystem consisting of g-C 3 N 4 as scaffold and embedded half-metallic C(CN) 3 as cocatalysts was conceptually designed for photoconversion of CO 2 . The no-slot joint between half-metallic C(CN) 3 and g-C 3 N 4 through covalent bonding generates a unique two-dimensional, π-conjugated hybrid structure, allowing obstacle-free transferring of the photogenerated electrons in g-C 3 N 4 into C(CN) 3 via an intrinsic driving force. Our theoretical calculations together with the in-situ Fourier transform infrared spectra indicate that the most negative charge distribution and binding energy with CO 2 for C(CN) 3 allow outstanding capture and chemical activation capacity toward CO 2 , and subsequently enable the optimized heterosystem to exhibit highly efficient and selective photocatalytic reduction of CO 2 into CO, 7.8 and 1.9 times those produced with pristine and Pt-modified g-C 3 N 4 , respectively. The no-slot joint of organic half-metal cocatalysts with g-C 3 N 4 may open up new opportunities for metal-free, polymer-based photocatalytic systems for CO 2 conversion and solar fuel generation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zengxin Pu,Bing Xiao,Siman Mao,Yingxue Sun,Dandan Ma,Hongkang Wang,Jun Zhou,Yonghong Cheng,Jian-Wen Shi
Photocatalytic hydrogen evolution from water splitting presents an attractive prospect in dealing with the energy crisis, but the low efficiency of charge separation and migration still seriously hinders its further practical application. Here, an acidified boron-doped g-C 3 N 4 (HBCNN) and cobalt porphyrin metal organic frameworks (CoPMOF) self-assembled two-dimensional and two-dimensional (2D/2D) hybrid photocatalyst is fabricated successfully. The resultant HBCNN/CoPMOF with optimum ratio exhibits a superior H 2 evolution rate of 33.17 mmol g −1 h −1 , which is 3.04 and 100.50 times higher than the single HBCNN and CoPMOF, respectively. It is found that a coordination connection has formed between CoPMOF and HBCNN through Co-N bond, and the interfacial Co-N bond then forms a pseudo-gap in the up-spin channel of electronic states, establishing an electron-hole separation mechanism. It is this electron-hole separation mechanism that contributes to a Z-scheme transport mode of photogenerated carriers, which greatly promotes the photocatalytic H2 production performance of HBCNN/CoPMOF heterostructure. This work may provide an idea for the design of heterojunction to improve the photocatalytic performance by constructing electron-hole separation through interfacial bond.
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