Journal of Water Process Engineering
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2024
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IF 6.3
Junjie Su,Qi Yang,Zhihu Zhang,Ziyue Zhang
Nowadays, Ni/Fe bimetallic nanocomposites have shown great potential for removing Cr(VI). However, the action of Ni 0 in Cr(VI) removal is still controversial, which was studied in this work. In this study, Ni/Fe@Fe 3 O 4 -g-C 3 N 4 (NFFOCN) nanocomposites were applied to remove Cr(VI) from aqueous solutions and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. Batch experiments were conducted to evaluate the Cr(VI) removal performance. Experimental results demonstrated that under optimal operating conditions (pH 5.5, 10 mg/L Cr(VI), 0.3 g/L NFFOCN, 30°C), a Cr(VI) removal efficiency of 90.78% was achieved within 50 min. Theoretical maximum adsorption capacity was calculated to be 36.101 mg/g. Combining experimental and characterization results, it could be concluded that Cr(VI) removal was attributed to the synergistic effect of the NFFOCN components. Ni 0 not only participated directly in the reduction of Cr(VI) as an electron donor, but also converted the corrosion product H 2 of nano-zero-valent iron (nZVI) into highly reducible atomic hydrogen (·H) to remove Cr(VI). Additionally, Ni 0 could form a primary battery with nZVI, facilitating the electron transfer between nZVI and Cr(VI). NZVI and its derivatives, Fe 2+ ions and green rust, were responsible for Cr(VI) reduction. Furthermore, the presence of Fe 3 O 4 and carbon nitride (g-C 3 N 4 ) improved the stability and reactivity of the nanocomposites.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Yanhui Niu,Wenshuo Zhang,Huiyun Xia,Ningning Li,Lifang Song,Xu Li,Liying Cui
As well known, the apparent structure and chemical composition of self-cleaning photocatalytic coatings are crucial for their application. In this study, C 3 N 4 with a large specific surface area was introduced into N-CQDs/Bi 2 WO 6 to construct a highly catalytic active catalyst (CBW-0.5), which continuously degraded 57.7 % of NO. A robust self-cleaning photocatalytic coating (CCBW-B) was prepared by firmly bonding CBW-0.5 to the substrate through a layered spraying process. CBW-0.5 endowed CCBW-B with high catalytic activity, maintaining a degradation rate of 64.9 % for NO, and most of the surface organic dye contamination was degraded after 36 h. Due to the appropriate arrangement of low surface energy substances and micro/nano particles on the surface, CCBW-B with a graded cross network on the surface has contact angles (CA) of 156°/145° for water/olive oil, respectively. The influence of each component of CCBW-B on its photocatalytic and liquid repellent ability was studied, and the patterns for the differences in coating performance due to the changes in surface roughness structure caused by different layer distributions was discussed. In addition, the mechanism for the excellent performance of CCBW-B was explored using SEM, specific surface area, and the theory of the generation and distribution of air pockets. Finally, the durability and self-cleaning ability of CCBW-B were tested, and the synergistic mechanism of self-cleaning and photocatalysis was also provided.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Jie Mao,Jihui Wang,Jun Zhang,Sha Shi,Yizhen Zhang,Yaohui Bai,Jiuhui Qu
The persistence of pharmaceuticals and personal care products (PPCPs) in aquatic ecosystems poses severe environmental risks, primarily owing to their incomplete removal by conventional treatment methods and potential for inducing bacterial resistance. While CdS/g-C 3 N 4 heterojunctions exhibit promise for photocatalytic degradation, the role of nitrogen-defect engineering in steering interfacial charge behavior to synergize photocatalysis with persulfate (PS)-based advanced oxidation remains unexplored. Herein, a nitrogen-deficient Z-scheme CdS/g-C 3 N 4 (CdS/N-CN) heterojunction was designed via hydrothermal synthesis to enable solar-driven cooperative photocatalysis and PS activation for PPCPs degradation. The optimized system achieved complete degradation of 10 mg/L sulfamethoxazole (SMX) within 60 min under visible light, achieving a rate constant (0.157 min −1 ) 29 times higher than pristine g-C 3 N 4 . Mechanistic investigations demonstrated dual-pathway operation: a built-in electric field drove Z-scheme charge transfer, migrating electrons from N-CN to CdS while holes in N-CN served as primary oxidants. Meanwhile, electrons from CdS activated PS to generate sulfate and hydroxyl radicals, with the latter transforming into singlet oxygen for supplementary oxidation. This synergistic photocatalysis-PS activation system maintained efficient redox activity while enhancing charge separation, ultimately enabling effective PPCPs decontamination. This research presents a novel strategy for leveraging solar-driven heterojunctions and persulfate chemistry for sustainable water remediation.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Xiaohua Zheng,Zhongchen Chen,Chenbin Cai,Huilin Han,Ruomeng Zhang,Jingting Yang
In recent years, ternary heterojunction catalysts have emerged owing to their exceptional properties for integrating the advantages of various materials, enabling the efficient separation of photoinduced charges and enhanced redox performance. In this study, a novel dual Z -scheme g-C 3 N 4 /Ag 6 Si 2 O 7 /AgBr (CNASAB) photocatalyst was prepared using a one-step coprecipitation method. Its catalytic performance was assessed through the photodegradation of tetracycline hydrochloride (TC) and Rhodamine B (RhB). The results showed that among various CNASAB compositions, CNASAB6 exhibited the highest catalytic activity. The catalyst achieved complete degradation of RhB within 6 min under visible light irradiation, with catalytic rates 73.7, 53.0, and 6.8 times higher than those of the individual components, g-C 3 N 4 , Ag 6 Si 2 O 7 , and AgBr, respectively. Additionally, the catalyst exhibited significant degradation of TC with an efficiency of 63.38 % within 2 min, indicating a broadened degradation ability. Ultraviolet-visible diffuse reflectance spectroscopy, photoluminescence spectroscopy and electrochemical impedance spectroscopy analyses confirmed that the ternary heterojunction broadened the spectral response range, reduced electrochemical impedance, and improved the separation of photoinduced electron-hole pairs. The successful construction of this ternary heterojunction not only provides a promising strategy for the photocatalytic degradation of organic pollutants but also has substantial potential for environmental purification applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Jiaxing Huang,Jiapeng Zhong,Ruipu Yao,Xiaojun Zhong,Qiao Xue,Xiaolong Yu,Qianwei Liang,Ke Zhong,Ningyu Tu,Jianteng Sun
An efficient photocatalyst was constructed via a simple single-stage thermal condensation reaction and applied to photoinduced peroxymonosulfate (PMS) activation for naproxen (NPX) degradation. Batch experiments demonstrated that phosphorus (P)–iron (Fe)-codoped g-C 3 N 4 (PFeCN) exhibited superior catalytic performance compared to previously reported catalysts, achieving 97 % NPX degradation within 20 min and a reaction rate constant approximately tenfold higher than that of pristine g-C 3 N 4 . P Fe codoping increased active site exposure, improved charge carrier separation efficiency, and enhanced light absorption capacity. Specifically, P N sites served as adsorption and activation centers for PMS, while Fe doping alleviated the reduction in specific surface area caused by P doping and further enhanced photoelectrochemical properties. Radical species analysis confirmed superoxide radicals as the dominant reactive species. The degradation pathways and toxicity evolution of NPX were also investigated, providing critical insights for environmental risk assessment. Furthermore, PFeCN maintained robust catalytic performance under various environmental conditions and after multiple cycles, indicating strong application prospects. This study offers key perspectives on the rational design of heteroatom-doped photocatalysts through atomic-level engineering for efficient photoinduced PMS activation.
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PubMed
高影响因子
VACUUM
·
2024
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IF 3.8
Ying Du,Juan Li,Xinqi Ma,Quanhui Guo
With the development of economy, overuse of antibiotics has been seen as a huge threat to human health. Photocatalytic degradation is an effective method for resolving this problem at present. The method of combining plasmon resonance effect and Z-scheme heterojunction can effectively improve the separation efficiency of photogenerated carrier, which is of great significance for the treatment of antibiotic wastewater. Herein, the Ag/Ag 2 CrO 4 /g-C 3 N 4 catalyst was prepared by in-situ loading and photo-reduction method for the degradation of antibiotic wastewater containing tetracycline and quinolone antibiotics . The research results showed that mesoporous graphitized carbon nitride (denoted as g-C 3 N 4 ) provided good support for Ag and Ag 2 CrO 4 nanoparticles , and mesoporous composite Ag/Ag 2 CrO 4 /g-C 3 N 4 (denoted as ACO /CN) provided more reaction sites for organic pollutants degradation. Under visible light irradiation, 5%ACO/CN catalyst showed the best degradation activity and stability for tetracycline (TC), levofloxacin (LVFX), oxytetracycline hydrochloride (OTC) and norfloxacin (NFLX), and their degradation rate constants were respectively 5.66, 8.26, 11.72 and 15.97 times of Ag 2 CrO 4 which indicated it had good potential application value in the treatment of wastewater containing various organic pollutants. This benefits from the plasmon resonance effect of silver effectively improves the utilization efficiency of visible light and the Z-scheme heterojunction between Ag 2 CrO 4 and g-C 3 N 4 promotes the rapid transmission of photogenerated carriers. Based on the experimental results, the possible TC degradation pathway and photocatalytic mechanism were proposed. This study provides a simple way for the successful design and preparation of plasmon resonance effect synergistic Z-scheme heterojunction with promising applications in the treatment of antibiotic wastewater.
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Catalysis Science & Technology
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2025
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IF 4.2
Dongfang Han,Li Niu,Yuangong Ma,Youlin Huang,Wen-Sheng Zhang
To utilize near-infrared (NIR) light within the solar energy spectrum, we have engineered an advanced composite of NaYF4:Yb3+,Tm3+@g-C3N4@WO3@MXene (denoted as NYT@g-C3N4@WO3@MXene) capable of absorbing NIR light to facilitate photocatalytic reactions. This environmentally benign system integrates semiconductor heterostructures (g-C3N4 and WO3) with upconversion nanoparticles (NaYF4:Yb3+,Tm3+, abbreviated as NYT) and Ti3C2 MXene nanosheets. Experimental validation demonstrated exceptional performance in antibiotic remediation, with the composite achieving 86.3% tetracycline decomposition over 12 hours under NIR irradiation through synergistic mechanisms, while also exhibiting good cycling stability. The enhanced photocatalytic activity arises from collaborative effects between upconversion luminescence, optimized charge transfer pathways within the heterojunction architecture, and the visible light absorption characteristics of MXene.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Weimin Liu,Xuerui Zhao,Kefan Huang,Shumei Liang,Jian Li
Magnesium alloys possess significant application potential in various industrial sectors owing to their low density and high specific strength. Nevertheless, their poor corrosion resistance under harsh service conditions remains a critical challenge. In this study, a slippery liquid-infused porous surface (SLIPS), with hydrophobicity, anti-corrosion, and anti-fouling properties, was developed on Magnesium alloy substrates. A robust zeolitic imidazolate framework-8/graphitic carbon nitride (ZIF-8/g-C 3 N 4 ) coating with highly hydrophobic was first constructed on the Mg alloy surface, followed by silicone oil infusion. Within the hierarchical architecture, ZIF-8 nanoparticles are uniformly distributed on g-C 3 N 4 nanosheets, where ZIF-8 serves as anchoring sites to immobilize silicone oil, while g-C 3 N 4 nanosheets act as an effective physical barrier, mitigating both the penetration of corrosive media and the leakage of silicone oil. Benefiting from this synergistic structure, the prepared SLIPS exhibited significantly enhanced anticorrosion performances, with a minimum corrosion current density of 3.49 × 10 - ⁸ A·cm - ² and a maximum corrosion potential of -1.375 V. Furthermore, the ZIF-8/g-C 3 N 4 SLIPS maintained a high impedance modulus of 1.28 × 10⁵ Ω·cm² after 120 h of immersion in NaCl solution, highlighting its long-term stability. This study offers a controllable structural strategy for the development of ultradurable slippery surfaces with long-term corrosion resistance.
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Journal of Water Process Engineering
·
2025
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IF 6.7
Yongxiu Song,Shifei Kang,Mingzhu Huang,Youduo Wu,Yuyang Lv,Chuang Xue
The generation of hydroperoxyl radical ( OOH) radicals is an important issue and has significant value in the highly selective removal of pollutants in complex water environment. However, the metal active center catalysts frequently encounter the limited surface site type and energy level mismatch, making it difficult to maintain a stable supply of OOH. Therefore, a novel photocatalytic self-Fenton system based on metal-free g-C 3 N 4 /chitosan (g-C 3 N 4 /CS) catalyst was developed to achieve excellent efficiency in the removal of tetracycline, bisphenol A and 2,4-dichlorophenol across a broad pH range (3.14–9.04), superior the conventional Fenton system which only works at pH 3–5. Chitosan modification enhanced the charge separation and transfer efficiency of the S-scheme charge transfer pathway, optimized the formation of OOH, O 2 − , h + , enhancing the selective generation and stable supply of OOH radical with a high ratio of 33 %, led to the efficiency removal of pollutants. Further mechanistic analysis demonstrated the unique dominance of the desired OOH radicals. g-C 3 N 4 /CS catalyst exhibited excellent stability and reusability by the cycling experiments, suggesting durable OOH supplying. This work offers novel insights into g-C 3 N 4 based metal-free catalyst with special radical features through chitosan modification, demonstrating the potential for industrial applications of OOH dominated g-C 3 N 4 /CS self-Fenton system in wastewater treatment.
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Nanomaterials
·
2025
·Vol. 15
·期 11
·833
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IF 4.3
Song Cui,Yaocong Liu,Xiaolong Dong,Xiaohu Fan
The widespread contamination of aquatic environments by tetracycline antibiotics (TCs) poses a substantial threat to public health and ecosystem stability. Although photo-Fenton processes have demonstrated remarkable efficacy in degrading TCs, their practical application is limited by challenges associated with catalyst recyclability. This study reports the development of a novel magnetic recoverable SrFe12O19/g-C3N4heterostructure photocatalyst synthesized via a facile one-step co-calcination method using industrial-grade precursors. Comprehensive characterization revealed that nitrogen defects and the formation of heterojunction structures significantly suppress electron (e−)–hole (h+) pair recombination, thereby markedly enhancing catalytic activity. The optimized 7-SFO/CN composite removes over 90% of oxytetracycline (OTC) within 60 min, achieving degradation rate constants of 0.0393 min−1, which are 9.1 times higher than those of SrFe12O19(0.0043 min−1) and 4.2 times higher than those of g-C3N4(0.0094 min−1). The effectively separated e−play three critical roles: (i) directly activating H2O2to generate ·OH radicals, (ii) promoting the redox cycling of Fe2+/Fe3+ions, and (iii) reducing dissolved oxygen to form ·O2−species. Concurrently, h+directly oxidize OTC molecules through surface-mediated reactions. Furthermore, the 7-SFO/CN composite exhibits exceptional operational stability and applicability, offering a transformative approach for scalable photocatalytic water treatment systems. This work provides an effective strategy for designing efficient and recoverable photocatalysts for environmental remediation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Zhiwei Liu,Haiping Liu,Xinyue Zhang,Jing Liang,Litao Liu,Li Guo,Qiancheng Gao,Huichong Wang,Qinyu Liu,Wenjing Zhang,Yiran Wang,Qingzhao Li
Endocrine-disrupting chemical phthalate Esters (PAEs) pose a serious threat to public health. Herein, a dual-defect g-C3N4 with stronger unsaturated sites was successfully synthesized by thermal polymerization of freeze-dried Tartaric acid-pretreated melamine precursor for the photocatalytic peroxydisulfate (PS) activation, aiming at solving the problem on the treatment difficulty of wastewater with low concentration phthalate Esters (PAEs). The nitrogen vacancy and -C≡N defects was determined by a combination of spectroscopic techniques, XPS and electron spin resonance tests. Based on photoluminescence and electrochemical tests, electron traps generated at defect sites resulted in enhanced electron-hole separation. The CN-3/Vis system exhibited excellent PS catalytic activity with the 68.00% DMP (0.1 mmol L−1) degradation. The first-order kinetic constant (k) of DMP degradation in the CN-3/PS/VIS system reached 0.00576 min−1 with high PS utilization efficiency. The solution pH showed significant influence on DMP degradation with 42.11% and 76.72% removal efficiency at pH 3.5 and 9.0, respectively. Moreover, the nitrogen vacancy and surface morphology changed little and maintained the removal rate of 65.00% of the DMP in the fourth cycle. Furthermore, Radical quenching experiments and EPR measurements revealed the dominated role of hydroxyl and sulfate radicals. The oxidative active species of hydroxyl(•OH), superoxide(O2•-), sulfate (SO4•−) radical and hole(h+) contributed to the oxidation, hydrolysis and hydrogen substitution of DMP. The 10 intermediate degradation products were speculated by GC-MS analysis and byproducts transformation pathways mainly included decarboxylation reaction, hydroxylation reaction, carboxylation, and ring-opening reactions. The TEST and ECOSAR software revealed the production of relatively less toxic compounds in the CN-3/PS/VIS system. The mechanism analysis revealed that dual-defect CN-3 showed optimal electronic structure, enhanced visible light response and promoted photogenerated electron hole separation, achieved better photocatalytic activity towards peroxydisulfate (PS) for DMP removal. The potential environmental practicability was verified by wastewater simulation in CN-3/PS/Vis system. The study demonstrated a promising candidate of defective g-C3N4 in the effective removal of trace phthalates from wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Sobia Niazi,Imran Mahmood Khan,Ye Yu,Imran Pasha,Yan Lv,Ali Mohsin,Bilal Sajid Mushtaq,Zhouping Wang
Aflatoxin M 1 is a prevailing natural carcinogenic mycotoxin, found in milk. Herein, we reported a sensitive fluorescent aptasensor for AFM 1 , based on rolling circle amplification (RCA) technology to improve the sensitivity of the assay. The detection of AFM 1 was achieved using KYF 4 : Eu 3+ time-resolved fluorescent nanoparticles (KYF 4 : Eu 3+ TRFNPs) as signal probe and graphitic carbon nitride (g-C 3 N 4 ) nanosheet as a quencher. The AFM 1 aptamer act as a recognition element and as a primer for DNA synthesis. TRFNPs attached to complementary DNA (TRFNPs-cDNA) acts as a signal probe. In the absence of target, a rolling circle template (RCT) ligated to aptamer and RCA reaction initiated. The TRFNPs-cDNA was strengthened to amplified RCA product (RCAP) to make RCAP/TRFNPs-cDNA duplex. This duplex cannot be adsorbed onto g-C 3 N 4 , and ultimately no fluorescence quenched. In the presence of AFM 1 , aptamer recognized the target and aptamer-target complex was formed. Hence, no aptamer hybridized with RCT, therefore, no RCA and duplex formation. Consequently, free TRFNPs-cDNA adsorbed onto g-C 3 N 4 and resulted in quenched fluorescence. The assay provides a lower detection limit (0.0194 pg/mL) than the previously reported assays and has good recoveries between 92–99.8 %. Hence, the present method would be a suitable method for the quantification of small molecules.
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