SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
·
IF 4.6
Zemiao Wang,Yang Hu,Jiayi Liu,Guizhen Luo,Xue He,Fengping Chen,Ling Fang,Zongwen Wang
The development of gold nanobipyramid (AuNBP)-based multicolor colorimetric aptasensors offers significant advantages for enabling sensitive, accurate, and visual on-site detection. However, existing AuNBP growth-based strategies suffer from the inherent limitations of enzymes and the instability of AuNBPs that restrict their application in aptasensor construction. In this study, a multicolor colorimetric aptasensor based on a novel G-quadruplex (G4) DNAzyme-mediated AuNBP growth strategy was developed for the detection of quinclorac (QNC), a prevalent acid herbicide. First, complexes of magnetic bead (MB)-QNC aptamer (Qapt)-G4 DNA were formed through an MB-assisted competitive aptamer-binding system. In this system, the amount of MB-aptamer-G4 DNA complexes formed was directly proportional to the QNC concentration. These complexes subsequently facilitated the G4 DNAzyme-catalyzed oxidation of hydroquinone (HQ). The remaining HQ was then utilized to grow AuNBPs, leading to distinct multicolor variations. Under optimal conditions, the aptasensor exhibited nine discernible color changes corresponding to different QNC concentrations with a visual limit of detection (LOD) of 0.5 μM and an instrumental LOD of 113 nM. Moreover, the aptasensor demonstrated excellent specificity and color stability. It was successfully used to determine QNC in river water, soil, and rice samples with recovery rates of 95.20 %–100.69 % and relative standard deviations ( n = 5) < 3 %. These results indicate that it is a reliable and promising method for the rapid screening of QNC residues in environmental and food samples. Furthermore, this work provides a valuable reference strategy for transforming G4 DNAzyme-based colorimetric aptasensors into multicolor analytical platforms.
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PubMed
高影响因子
Carbohydrate Polymer Technologies and Applications
·
2025
·
IF 6.5
Liu Shi,Sihui Lin,Yixuan Gong,Xiangrong Wei,Jie Ruan,zhongxiao zhou
Flocculation is crucial for water purification, but conventional flocculants are hampered by inefficiency and environmental concerns. This study develops a novel chitosan-polyacrylamide (CS-PAM) flocculant innovatively synthesized using graphitic carbon nitride (g-C₃N₄) as a dual-function photoinitiator and cross-linker. This facile photocatalytic approach under ambient conditions yielded a composite flocculant (CNCSPAM) with a uniquely integrated network. The optimized CNCSPAM exhibited exceptional performance in treating highly turbid wastewater, achieving over 97% turbidity removal at an ultralow dosage of 0.25 mg L⁻¹, rapid sedimentation kinetics (<2 min), vastly outperforming its individual components. It also demonstrated wide pH applicability and strong tolerance to environmental interferents. Flocculation kinetics and mechanism studies revealed that the high efficiency stems from a synergistic effect: charge neutralization by chitosan enhanced by the bridging effect of the cross-linked PAM network. This work provides a sustainable and cost-effective flocculation strategy, notable for its green synthesis, minimal dosage, and high efficacy, representing a significant advance for water treatment technologies.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Jiawei Xiao,Yongli Li,Jinshu Wang,Ting He,Junshu Wu,Panting Song,Youheng Yao
Photocatalysis is regarded as a promising strategy to address global energy and environmental challenges. Therein, S-scheme heterojunctions composed of complementary semiconductors can significantly enhance the utilization efficiency of photogenerated charge carriers while preserving the inherent strong redox capabilities of the semiconductors. However, the inadequate interfacial contact between the host and guest semiconductors hinders the enhancement of carrier separation efficiency. Herein, we developed a facile route to obtain uniform dispersion of WO 3 quantum dots (QDs) on g-C 3 N 4 . Specifically, the interfacial W-N bonding tightened the connection between WO 3 and g-C 3 N 4 , which serves as an efficient pathway for electron transfer, and significantly accelerates the directional migration of charge carriers following S-scheme. The optimized WO 3 QDs/g-C 3 N 4 S-scheme heterojunction exhibits a remarkable hydrogen evolution rate of 11,097.3 μmol·g⁻¹·h⁻¹ under simulate solar irradiation. Notably, the catalyst enables prominently overall water splitting without adding sacrificial agent, achieving simultaneous evolution of stoichiometric hydrogen and oxygen, 254.5 and 125.8 μmol·g⁻¹·h⁻¹, respectively, which are 5.2 times higher than those of WO 3 NPs/g-C 3 N 4 . Even without deposition of Pt as the co-catalyst, WO 3 QDs/g-C 3 N 4 displays noticeable gas production from water. This work will provide an idea for design and preparation of efficient photocatalyst.
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高影响因子
CARBOHYDRATE POLYMERS
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2013
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IF 3.479
Zhu Xiong,Lisheng Zhang,Songqi Ma,Yong Yang,Chuanzhi Zhang,Zhaobin Tang,Jin Zhu
Blends of entirely bio-sourced polymers, namely polylactide (PLA) and starch, have been melt-compounded by lab-scale co-extruder with castor oil (CO) as a plasticizer. The enrichment of castor oil on starch had great effect on the properties of the blends. If the castor oil was mainly dispersed in PLA matrix, the properties of the blends were poor, but when the hexamethylenediisocyanate (HDI) was grafted on starch granules the ready reactions between the hydroxyl on CO and the isocyante on the HDI-grafted starch (HGSTs) brought CO molecules enriched on starch particles. DSC analysis shows that the CO layer on starch has a positive effect on the crystallization of PLA in the ternary blend. The accumulation of CO on starch greatly improves the toughness and impact strength of PLA/starch blends. The grafting content of HDI on the starch granules primarily determined the compatibility and properties of the resulted blends.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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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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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xia Zhou,Shuilai Qiu,Jiajia Liu,Mutian Zhou,Wei Cai,Junling Wang,Fukai Chu,Weiyi Xing,Lei Song,Yuan Hu
It's acknowledged that the inferior toughness of bismaleimide resin (BMI) is the crucial problem hindering its development and application especially in aerospace, mechanical and electronic fields. While the poor fire safety of toughened BMI is another problem urgently needed to be resolved. Therefore a novel g-C 3 N 4 @PPZ hierarchical architecture constituted of porous g-C 3 N 4 tubes modified by polyphosphazene was designed and fabricated to improve the fire safety and mechanical properties of BMI in this work. Especially compared to pure BMI, the peak heat release rate (PHRR) and peak smoke production rate (PSPR) of BMI with an incorporation of 2 wt% g-C 3 N 4 @PPZ (BMI/g-C 3 N 4 @PPZ2.0) are at 246.3 kW/m 2 and 0.12 m 2 /s accompanying with 52.1% and 53.8% reduction respectively. The total heat release (THR) and total smoke production (TSP) of BMI/g-C 3 N 4 @PPZ2.0 are endowed with reductions of 29.4% and 42.9% as well, which demonstrates that the fire safety including heat and smoke hazards of BMI/g-C 3 N 4 @PPZ2.0 is significantly improved. With regard to the mechanical performance of BMI composites, the impact strength of BMI/g-C 3 N 4 @PPZ1.5 is 18.89 kJ/m 2 which increases by 184.0% in comparison with that of pure BMI resin (6.65 kJ/m 2 ). And it’s found that the impact strength of BMI/g-C 3 N 4 @PPZ are still higher than pure BMI in hot-humid environment, which signifies that the BMI/g-C 3 N 4 @PPZ would be preferred in the industrial applications. Meantime the possible flame retardant and toughening mechanism of g-C 3 N 4 @PPZ in BMI is detailed investigated and proposed as well.
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高影响因子
Journal of Hazardous Materials Advances
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2021
·
IF 0
Xiao-Yu Zhang,Jing-Jing Wang,Ping Li,Yu-Jia Xiao,Zhao-Yi Tan,Yan-Rong He,Nuzahat Habibul
Herein, Fe 3 O 4 /g-C 3 N 4 composites with different proportions were prepared to remove U(VI) from wastewater through photocatalytic reduction. The morphology, composites, and magnetism of the Fe 3 O 4 /g-C 3 N 4 composites were measured. The characterization results showed that Fe 3 O 4 nanoparticles were well distributed on the surface of g-C 3 N 4 , resulting in the good magnetism and corresponding excellent separation ability of the composites. The U(VI) removal efficiency of the composites with different ratios of Fe 3 O 4 and g-C 3 N 4 was also determined. It was found that Fe 3 O 4 /g-C 3 N 4 with an Fe content of 14% showed the highest U(VI) removal efficiency of 98.7% after 25 min. The photocatalytic reaction rate constant was 0.161 min −1 , which was 2.9 times that of pure g-C 3 N 4 and 2.4 times that of pure Fe 3 O 4 . In addition, after five reaction cycles, the composite showed high photoreduction activity and magnetic properties.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Bin Zhang,Jun Ma,Huizhong Chi,An Ding,Yanjun Xin,Yingying Ma,Qingliang Liu,Xu He
Given the limitations of conventional vacuum ultraviolet (VUV) systems, a novel vacuum ultraviolet/graphite carbon nitride (VUV/g-C 3 N 4 ) system with high adaptability to varying environmental conditions was developed. Compared with conventional VUV and UV/g-C 3 N 4 systems, the VUV/g-C 3 N 4 system demonstrates a much higher ability for the efficient degradation of chlorophenols (CPs). In particular, the VUV/g-C 3 N 4 system exhibits outstanding performance even at low pH and high concentrations of humic acid and SO 4 2- . Alkaline conditions and the presence of HCO 3 - can further promote CP removal. In addition, the feasibility of the VUV/g-C 3 N 4 system was verified by its stable operation in both river water and tap water . Unlike conventional photochemical systems relying on •OH, the dominant reactive species for CP degradation by the VUV/g-C 3 N 4 system was identified to be •O 2 - . This study conclusively provided a novel system for the efficient photocatalytic treatment of pollutants.
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高影响因子
DYES AND PIGMENTS
·
2023
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IF 4.5
Shihang Liu,Xiaodi Chen,Chao Zhang,Xingliang Liu,Shiai Xu
In this study, three typical D–π–A type heteroaromatic organic dyes containing carbazole (CBZ), phenothiazine (PTZ), and phenoxazine (POZ) moiety as electron donor cores and linked to g-C 3 N 4 with amide covalent bonds were synthesized. Thereafter, we studied the long-term photochemical stability and degradation mechanism of the associated dye-sensitised g-C 3 N 4 with covalent linkage or weak interaction. The results revealed that most of the dyes degraded and became unstable after absorption on g-C 3 N 4 under light irradiation. Interestingly, after the target dyes were linked to g-C 3 N 4 with amide covalent bonds, the photostability could be effectively promoted and improved to high levels of stability. For POZ-S dye covalent bond-linked sample g-C 3 N 4 /POZ-S, ∼90.5% percent of the dyes were reserved, whereas only ∼25.3% remained for the physically absorbed dye sample g-C 3 N 4 +POZ-S after 30 min of irradiation aging test. Moreover, the obtained g-C 3 N 4 /POZ-S sample exhibited enhanced H 2 evolution activity with photocatalytic H 2 production rates that were approximately 96- fold of that of pure g-C 3 N 4 . Then, we applied various instrumental analysis and DFT calculation to clarify the mechanism involved with dye photostability and degradation pathway. The typical decarboxylation process was confirmed, and such an unfavourable reaction process could be effectively inhibited if the target dye is linked to g-C 3 N 4 with amide covalent bond instead of the weak interaction. Overall, the existed covalent bond is the key factor for enhancing both the photochemical stability and photocatalytic activity of organic dye-sensitised g-C 3 N 4 for hydrogen evolution .
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yuqi Cui,Xinyi Zhang,Huixuan Zhang,Qingfeng Cheng,Xiuwen Cheng
The application of semiconductor photocatalysts in wastewater treatment has received increasingly attentions because of its potential utilization of solar energy. In this study, a novel visible-light-driven (VLD) BiOCOOH/g-C 3 N 4 composite photocatalyst was successful synthesized by a facile hydrothermal method. Afterwards, physicochemical properties of the resulting samples were investigated through X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface areas, UV–visible diffuse reflectance spectroscopy (UV–vis DRS), transient photocurrent density, Mott-Schottky (M−S) and electrochemical impedance spectroscopy (EIS) measurement. Furthermore, the visible light photocatalytic (PC) performance was evaluated through the degradation of amido black 10B dye. All results indicated that the combination of g-C 3 N 4 and BiOCOOH could exhibited greatly visible light absorbance and photo-generated charge separation efficiency, thereby resulting in the enhanced PC performance of BiOCOOH/g-C 3 N 4 composite photocatalyst. The optimal Bi/C molar rate in BiOCOOH/g-C 3 N 4 composite was determined to be 1/1, and the corresponding photodegradation rate for amido black 10B was 0.01794 min −1 , which was nearly 2.19 and 5.73 folds higher than that of pure g-C3N4 and BiOCOOH. The possible mechanism of the PC reaction was also discussed in detail. Furthermore, BiOCOOH/g-C 3 N 4 composite photocatalyst performed good reusability and stability even after four recycle utilization.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
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IF 2.129
Shifu Chen,Yingfei Hu,Xiaoliang Jiang,Sugang Meng,Xianliang Fu
Developing a high-efficiency visible light photocatalyst is always a research hotspot in photocatalytic field. In this study, a novel Z-scheme photocatalyst WO 3 /g-C 3 N 4 with high efficient visible light photocatalytic activity was prepared via ball milling and heat treatment methods. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron spin resonance (ESR), and photoluminescence (PL). The photocatalytic activity was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The results showed that composite WO 3 /g-C 3 N 4 exhibits a much higher photocatalytic activity than a single g-C 3 N 4 . The rate constants of photocatalytic degradation of MB and BF for WO 3 (5.0 wt.%)/g-C 3 N 4 are 4.77 times and 3.84 times that of pure g-C 3 N 4 . The characterization results by physical and chemical methods demonstrated that composite WO 3 /g-C 3 N 4 is a typical Z-scheme photocatalyst. The enhancement of the photocatalytic activity may be attributed to the formation of the Z-scheme system between g-C 3 N 4 and WO 3 , which could result in the photoexcited electrons of g-C 3 N 4 and photoexcited holes of WO 3 participating in oxidation and reduction reactions, respectively.
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高影响因子
ChemCatChem
·
2019
·Vol. 11
·期 5
·1534-1544
·
IF 4.495
Xin Shan,Guifang Ge,Zhongkui Zhao
Graphical All-round talent ! Pyridinium alkaline ionic liquid serves as an all-rounder to fabricate graphitic carbon nitride with nitrogen defects (nitrogen vacancies and cyano groups) and extended π-conjugated system, generating a highly efficient photocatalyst for solar hydrogen production under visible light irradiation with 1284 μmol h −1 g −1 (λ>420 nm) of hydrogen evolution rate (13.6 times higher than that of bulk g-C 3 N 4 ) and 4.2 % of apparent quantum efficiency at 420 nm. Semiconductor photocatalytic hydrogen evolution from water splitting using solar energy is one of the most potential strategies for settling the energy crisis, but a bottleneck is occurred in developing a highly efficient photocatalyst. Herein, we successfully fabricated a tubular g-C 3 N 4 with nitrogen defects (including both nitrogen vacancies and cyano groups) and extended π-conjugated system, wherein the nitrogen defects and extended π-conjugated system were conveniently introduced during thermal polymerization of the pyridinium alkaline ionic liquid-modified hydrogen-bonding melamine-cyanuric acid supramolecular (PHMCS) pre-aggregates towards carbon nitride with hexagonal cylinder morphology formed by the pyridinium alkaline ionic liquid-assisted hydrothermal process of low-cost melamine, in which the added trace pyridinium alkaline ionic liquid serves as an all-rounder with three roles including the promoting agent towards the transformation of melamine to cyanuric acid for constructing PHMCS, nitrogen defects making agent, and the electronic-tuning agent regarding of the as-formed carbon nitride. The tubular structure enhances the light scattering and improves the accessibility of active sites. Meanwhile, the high charge transfer efficiency, broad optical absorption region, and suitable energy band positions are related to both the introduction of nitrogen defects by alkali of ionic liquid and the extended π-electron delocalization in the conjunction carbon nitride networks. As a consequence, the resulted carbon nitride using optimized amount of pyridinium alkaline ionic liquid (AIL-2.0-CN) photocatalyst exhibited a high hydrogen evolution rate of 1284 μmol h −1 g −1 (λ>420 nm) with an apparent quantum efficiency of 4.2 % at 420 nm, which is 13.6 times higher than that of bulk g-C 3 N 4 (B−CN), and even 3.5 folds much higher than the one (SHPY−CN) prepared by the similar process to that for AIL-2.0-CN except for the replacement of pyridinium alkaline ionic liquid by a mixture containing a corresponding amount of pyridine and sodium hydroxide, suggesting the promoting effect resulting from the unique characteristic of pyridinium alkaline ionic liquid. Based on the unique physicochemical properties and the molecules- adjustability, the developed alkaline ionic liquid assisted strategy can open an avenue for designing and preparing excellent g-C 3 N 4 based photocatalysts with tunable geometric and electronic structures for solar hydrogen production.
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危险品化学品经营许可证（带存储）