Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Qian Liu,Kangping Cui,Minshu Cui,Shijie Sun,Haiyang Li
As a green photocatalyst with simple synthesis method, excellent electronic structure, and metal-free properties, the deficiencies of pristine graphitic carbon nitride, such as high electron transfer resistance and narrow energy band gap, inhibit its photocatalytic activity to some extent. In this paper, we synthesized a sulfur and chlorine co-doped g-C 3 N 4 (SCl-CN) capable of efficient photocatalytic activation of peroxymonosulfate (PMS) by calcining a mixture of ammonium chloride and thiourea. By means of DFT calculation, the contribution of sulfur and chlorine to photogenic electron hole separation was discussed. The electrostatic potential of SCl-CN and the adsorption model between SCl-CN and PMS were deduced, and the activation mechanism of PMS was further analyzed. According to the calculated results, the incorporation of sulfur and chlorine tuned the electronic configuration of the material and intensified the interactions between SCl-CN and PMS. It is shown that free and non-free radicals act simultaneously in the SCl-CN/PMS/Vis system. This study provides a new idea for the study of photocatalytic activation of PMS by non-metallic co-doped carbon nitride.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Linghui Peng,Haiyu Wang,Guiying Li,Weiping Zhang,Zhishu Liang,Taicheng An
Most commercial air purifiers rely on dense fibrous filters for bioaerosols control, which filter the particulate matter size-dependently without bactericidal activity. Herein, the non-size-dependent bifunctional nickel foam filters (g-C 3 N 4 /TiO 2 (CT)/Ni-polydopamine(PDA)/Ni bifunctional filter) with two layers of coupling nickel foams deposited by CT and PDA, respectively, were developed. The bifunctional filter shows remarkable non-size dependent bacteria removal efficiency (93.5 %) and inactivation efficiency (∼70 %) within 20 min at high airflow (12.5 L min −1 ). The inactivation efficiency can be further increased to 99.99 % with prolong irradiation time and enhancement of light intensity. The non-size dependent capture effect of the CT/Ni-PDA/Ni provided by adhesive force and charge was verified. In addition, the assumption that reactive oxygen species (ROSs) could be transferred into air during bacteria inactivation was first proved by chemiluminescent. This pioneered study may provide new insights into the development of bifunctional filters for non-size dependent capture and photocatalytic inactivation of bacteria in bioaerosols .
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FOOD CHEMISTRY
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2025
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IF 9.8
Chen Hu,Chao Yang,Bo Li,Bangzhu Peng
Consumption of contaminated wines is a significant source of ochratoxin A (OTA) intake in humans, yet existing techniques for OTA removal are inadequate. This study constructs a TiO 2 /SiO 2 /g-C 3 N 4 catalyst (TiSiMs-TCN) with a tubular structure, capable of efficiently removing OTA from both simulated and real wines under visible light irradiation. The results of experiments, characterizations, and theoretical calculations demonstrate that the incorporation of silica enhances the adsorption capacity for OTA, and the tubular structure improves the catalyst's photoelectric properties. The internal electric field between TiSiMs and TCN facilitates electron transfer and the generation of active species, rapidly degrading the adsorbed OTA and promoting the regeneration of active sites, thus maintaining continuous adsorption-photocatalysis synergy. The OTA degradation pathway was analyzed using the Fukui index, electrostatic potential distribution, and intermediate product identification. Toxicological experiments confirm that TiSiMs-TCN is a safe and stable material capable of effectively detoxifying OTA contamination.
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Journal of Water Process Engineering
·
2025
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IF 6.7
Yang Yu,Lichao Xu,Kaiyuan Xu,Yan Li,Hao Chen,Dongxu Zhang,Yuanzi Chen,Yue Liu,Wenyue Qi
The construction of S-scheme heterojunctions has drawn widespread attention within the photocatalysis field due to their capacity for efficient separation of photogenerated carriers, leading to excellent photo-oxidation-reduction performance. Herein, a novel S-scheme loofah biochar/MoS 2 /g-C 3 N 4 (LB/MS/CN) heterojunction was successfully constructed by ultrasonication in 50 % ethyl alcohol and heat treatment in N 2 atmosphere. Degradation experiments showed that the 5 % LB/MS/CN ternary photocatalyst had optimal photocatalytic efficiency (96.4 %) for the degradation of rhodamine B (RhB), and the reaction rate (k) of this photocatalyst (0.05420 min −1 ) was 5.4 times that of unmodified CN (0.01001 min −1 ). Ultraviolet-visible diffuse reflectance spectra, Mott-Schottky, and free radical trapping experiments suggested that the photogenerated carriers in LB/MS/CN were transferred through the S-scheme structure. Consequently, the co-catalytic action of LB and the synergistic impact of the heterojunction structure between CN and MS led to a reduced photogenerated carrier recombination rate. Furthermore, LB/MS/CN had outstanding stability and the capacity to maintain RhB degradation performance under various environmental conditions (H 2 PO 4 − , NO 3 − , SO 4 2− , HCO 3 − , NaCl, humic acid (HA), and real water), showing good promise for practical applications. Thus, this work provides a possible strategy for purifying wastewater under visible light.
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Nanomaterials
·
2024
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IF 4.4
Fangqin Liu,Mingjie Fan,Xia Liu,Jinyang Chen
A cellulose-based carbon aerogel (CTN) loaded with titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) was prepared using sol–gel, freeze-drying, and high-temperature carbonization methods. The formation of the sol–gel was carried out through a one-pot method using refining papermaking pulp, tetrabutyl titanate, and urea as raw materials and hectorite as a cross-linking and reinforcing agent. Due to the cross-linking ability of hectorite, the carbonized aerogel maintained a porous structure and had a large specific surface area with low density (0.0209 g/cm 3 ). The analysis of XRD, XPS, and Raman spectra revealed that the titanium dioxide (TiO 2 ) and graphitic carbon nitride (g-C 3 N 4 ) were uniformly distributed in the CTN, while TEM and SEM observations demonstrated the uniformly distributed three-dimensional porous structure of CTN. The photocatalytic activity of the CTN was determined according to its ability to degrade rhodamine B. The removal rate reached 89% under visible light after 120 min. In addition, the CTN was still stable after five reuse cycles. The proposed catalyst exhibits excellent photocatalytic performance under visible light conditions.
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RSC Advances
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2025
·Vol. 15
·期 38
·31508-31521
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IF 4.6
Donghai Li,Yunrui Xu,Shilin Zhang,Linping Wang
To improve the utilization of solar energy and the efficiency of photocatalytic organic pollutant degradation, novel Z-scheme heterojunctions with high visible light catalytic performances have been widely developed. Herein, a novel Z-scheme BiFeO3/Ag/g-C3N4 heterojunction with a hierarchical 1D/0D/2D structure and visible light absorption was constructed by matching the suitable band structure between 1D BiFeO3 and 2D g-C3N4 and employing the localized surface plasmon resonance (LSPR) effect of 0D Ag nanoparticles. BiFeO3 nanofibers were synthesized via the electrospinning technique, providing short electron transport paths and visible light absorption range for g-C3N4. Plasmonic Ag nanoparticles were photodeposited on the surface of BiFeO3 to enhance the separation efficiency of the photogenerated electron–hole pairs between the bulk interfaces. UV-vis DRS, PL, photocurrent and EIS spectra confirmed the important roles of Ag and BiFeO3 in improving the photocatalytic activity of the Z-scheme heterojunction. The working principle of the BiFeO3/Ag/g-C3N4 Z-scheme heterojunction was proposed, indicating that ˙O2− and ˙OH are the main active species for the photocatalytic degradation of methylene blue (MB). The prepared BiFeO3/Ag/g-C3N4 heterojunction exhibited the highest photocatalytic activity, where its rate constant was 5.84 times higher than that of the pristine BiFeO3 and 3.26 times higher than that of the pristine g-C3N4. This study offers a new means for the design of novel high-performance photocatalysts, which can be a promising candidate in industrial applications.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
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IF 3.764
Like Ouyang,Yan Zhang,Yuan Wang,Xinlong Wang,Shaojun Yuan
The coupled adsorption–photocatalytic oxidation process provides a great potential scenario to enhance the removal efficiency of arsenite contaminants by converting As(III) to As(V) and simultaneous adsorption. In this study, the boron-doped black TiO2/g-C3N4 nanocomposite is synthesized by combination of sol–gel and in situ decomposition-thermal polymerization methods as a photocatalyst for the photocatalytic oxidation and adsorption of As(III). Under dark conditions, the boron-doped samples (B-TiO2 and B-TiO2/g-C3N4) display an increase in the As(III) adsorption capacity by one order of magnitude up to circa 3.2 mg g–1 with an initial As(III) concentration of 2 mg L–1 at 298.15 K and pH 5. The adsorption kinetics of As(III) on B-TiO2/g-C3N4 conform to the pseudo-second-order kinetic model, revealing the chemical adsorption mechanism. Under visible light irradiation, the total arsenic removal capacity is substantially improved by 20% with a removal capacity of 3.9 mg g–1. The enhancement of arsenic adsorption is attributed to the chemical complexation and hydrogen bond, in which B–OH bonds play a dominant role. The photocatalytic oxidation mechanism of the as-synthesized B-TiO2/g-C3N4 is attributed to the synergism of superoxide radicals, hydroxyl radicals, and photogenerated holes.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Runyu Zhou,Yongsheng Fu,Gaofeng Zhou,Shixiang Wang,Yiqing Liu
In this study, a novel Fe/Co bimetallic spinel sulfide (FeCo 2 S 4 ) modified g-C 3 N 4 composite (FeCo 2 S 4 -CN) was prepared by a hydrothermal method and firstly applied as a catalyst for the activation of peracetic acid (PAA) at neutral pH. The efficient rhodamine B (RhB) degradation in FeCo 2 S 4 -CN/PAA system indicated that PAA was successfully activated by FeCo 2 S 4 -CN. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results indicated that g-C 3 N 4 carrier could anchor FeCo 2 S 4 particles with good dispersion. The X-ray photoelectron spectroscopy (XPS) analysis suggested that the surface ≡Co(II) and ≡Fe(II) could activate PAA to form CH 3 C(O)O • and • OH, synchronously yielding ≡Co(III) and ≡Fe(III). Meanwhile, the surface ≡Co(III) and ≡Fe(III) could also react with PAA to generate CH 3 C(O)OO • as well as ≡Co(II) and ≡Fe(II), resulting in the redox cycles of ≡Co(II)/≡Co(III) and ≡Fe(II)/≡Fe(III). Besides, the presence of S 2- in FeCo 2 S 4 -CN was favorable to these redox cycles. Radical scavenging experiments confirmed that organic radicals (i.e., CH 3 C(O)O • and CH 3 C(O)OO • ) were the primary reactive species for RhB degradation in FeCo 2 S 4 -CN/PAA system. This system also exhibited a high removal efficiency for various organic contaminants, suggesting its potential application in degrading refractory pollutants.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Rongdi Tang,Daoxin Gong,Yaocheng Deng,Sheng Xiong,Jie Deng,Ling Li,Zhanpeng Zhou,Jiangfu Zheng,Long Su,Lihua Yang
In this study, a novel π-π stacked PDI/g-C 3 N 4 /TiO 2 @Ti 3 C 2 photocatalyst with step-scheme (S-scheme) heterojunction was constructed to boost the atrazine (ATZ) photocatalytic degradation by activating peroxymonosulfate (PMS). The π-π interaction in the PDI/g-C 3 N 4 induced the delocalization of the photoelectrons, therefore promoted their migration. Meanwhile, the intimate contact and the staggered band configurations between the PDI/g-C 3 N 4 and TiO 2 @Ti 3 C 2 results in the S-scheme heterojunction thus declined the recombination of photocarriers. The π-π interaction and S-scheme heterojunction synergistically promoted the ATZ removal rate to 75% within one hour and can be well-adapted in a variety of environments. It was found that 1 O 2 domain the photocatalysis, and the H 2 O 2 generated during the reaction may also be helpful for the process. The transformation of ATZ, intermediates, and three pathways during the process were also investigated via LC-MS. Moreover, the total organic carbon analysis shows that the mineralization of ATZ reached 46.08%.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Guangyong Zeng,Zhenzhen He,Tao Wan,Tairan Wang,Zhaomei Yang,Yongcong Liu,Qingquan Lin,Yiheng Wang,Arijit Sengupta,Shengyan Pu
The present paper deals with the coupling the advantages of photocatalysis and membrane technology in order to resolve the issue of membrane fouling without any compromise on separation characteristics. The g-C 3 N 4 (CN) nanosheets have been used to modify two-dimensional (2D) MXene membrane, to obtain novel g-C 3 N 4 @MXene/PES (CN-MX) photocatalytic composite membrane through vacuum filtration for wastewater treatment. The 2D materials and membranes have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) to evidence successful modification. The CN-MX composite membrane exhibited higher permeability than that of pure MXene membrane, which achieved a maximum permeability of 1790 L·m −2 ·h −1 ·bar −1 . The composite membrane also showed a fabulous removal ratio for different organic pollutants: 98 % for Congo red (CR), 96 % for Trypan blue (TB) and 86 % for Tetracycline hydrochloride (TC), respectively. The best performed membrane (M3) was found to sustain three consecutive separation cycles without any performance deterioration and thereby, confirming a significant improvement in anti-fouling characteristic of the membrane.
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Catalysis Science & Technology
·
2018
·Vol. 8
·期 14
·3484-3492
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IF 5.365
Xing Ding,Dong Xiao,Lei Ji,Ding Jin,Ke Dai,Zixin Yang,Shengyao Wang,Hao Chen
The construction of a multifunctional two-dimensional (2D) composite photocatalyst is of great significance because such a composite can exhibit enhanced catalytic performance and improved practical usability in contrast to a single component catalyst. Herein, a ternary photocatalyst composed of g-C3N4, a carbon layer (C), and Fe3O4 nanoparticles was successfully synthesized by a facile one-pot hydrothermal carbonization (HTC) method from g-C3N4, glucose, and FeCl3. The resultant composite, Fe3O4/C/g-C3N4, had an ordered 2D heterostructure and exhibited enhanced visible-light-driven photocatalytic performances and good magnetic recyclability. The kobs for Cr(VI) photoreduction (or dimethoate photodegradation) over Fe3O4/C/g-C3N4 was 20.9-fold (or 2.1-fold) of that over g-C3N4. Comparative study of Fe3O4/C/g-C3N4, C/g-C3N4, and g-C3N4 on their optoelectronic properties revealed that this enhanced photocatalytic activity was mainly due to rapid photogenerated electron transport from the g-C3N4 component to carbon and/or Fe3O4, which effectively suppressed the recombination of photogenerated electrons and holes. In addition, the good surface adsorption capacity of the carbon component towards Cr(VI) also contributed to Cr(VI) photoreduction over Fe3O4/C/g-C3N4. Finally, a reasonable photocatalytic reaction mechanism of Fe3O4/C/g-C3N4 was proposed based on the results of trapping experiments. This study is not only limited to developing a high-performance g-C3N4 based photocatalyst, but also expected to provide a green, facile, and cost-efficient strategy to combine 2D materials with a carbonaceous layer and other functional components for a multifunctional system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Haitao Li,Ming Wang,Yiping Wei,Fei Long
A series of noble-metal-free NiS 2 -loaded g-C 3 N 4 hybrid composites were prepared via simple hydrothermal method. Benefited from the wider spectral response range and the effective separation of photoelectron-holes of g-C 3 N 4 -NiS 2 heterojunction catalysts, as well as the rich unsaturated active S atoms on the NiS 2 with S 2 2− , the composite catalysts has prominent photocatalytic performance for H 2 evolution. Remarkably, the optimal composite photocatalysts achieved an average hydrogen production rate as high as 715.83 μmol/h/g in 3 h under visible-light irradiation, which is 2.75 times as high as that of precious metal Pt (259.5 μmol/h/g) as a co-catalyst. Besides, the composite catalyst still shows prominent photocatalytic performance for H 2 evolution after three continuous photocatalytic reaction cycles for 9 h. This study provided a facile method to build a low-cost but effective metal sulfide co-catalyst for hydrogen production under visible light irradiation.
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