查找使用阿拉丁产品的科研文献

Enhanced photocatalytic degradation of tetracycline by BiOCl/ZnPc Z-type heterojunction under visible-light irradiation: Promoting singlet oxygen generation

Dandi Cai,Yang Sun,Yuzhi Liu,Donglei Zou,Shuang Zhong

Singlet oxygen ( 1 O 2 ) exhibits superior effectiveness in degrading electron-rich organic pollutants. Herein, we propose a method to modulate 1 O 2 generation by solvothermal construction of bismuth oxychloride/zinc phthalocyanine (BiOCl/ZnPc) heterojunction system. This approach broadens the photoresponse range of BiOCl, strengthens the internal electric field (IEF) between the interfaces, and significantly enhanced the photocatalytic activity of the heterojunction system. The efficiency of the photocatalytic degradation process was evaluated using chlortetracycline hydrochloride (CTC) as a model emerging contaminant. The CTC removal rate using BiOCl/ZnPc (97.94 % in 120 min) was 1.33 times and 17.53 times those of BiOCl (73.47 % in 120 min) and ZnPc, respectively. Electron spin resonance and radical quenching tests revealed that singlet oxygen ( 1 O 2 ) and superoxide radicals (·O 2 − ) played a role in photocatalytic oxidation. The presence of 1 O 2 in the BiOCl/ZnPc heterojunction system enhanced the photocatalytic efficiency of the electron-rich organic compounds such as CTC. This study provides new ideas for heterojunction enhancement to strengthen the efficiency of charge transfer-enhanced generation of 1 O 2 and efficient degradation of electron-rich organic pollutants in water.

Thermo-Responsive ZnPc-g-TiO2-g-PNIPAM Photocatalysts Sensitized with Phthalocyanines for Water Purification under Visible Light

Bingxin Mao,Cong Liu,Xu Cui,Yanhui Li,Qian Duan

A novel thermo-responsive 2,9(10),16(17),23(24)-tetrakis[(3-carboxyacrylamide) phthalocyaninato] zinc (ZnPc)-g-TiO2-g-poly(N-isopropylacrylamide) (PNIPAM) photocatalyst modified with phthalocyanines was prepared. The photocatalyst exhibited thermo-responsive properties due to the introduction of PNIPAM, which performed recovery for reuse above the lower critical solution temperature (LCST, about 26 °C). ZnPc-g-TiO2-g-PNIPAM effectively expanded the light response range to the visible light region and inhibited the recombination of electron–hole pairs, which enhanced the performance of the photocatalyst. As expected, ZnPc-g-TiO2-g-PNIPAM (0.3 g/L) exhibited excellent photocatalytic performance for the removal of Rhodamine B (RhB, 1.0 × 10−5mol/L) and methylene blue (MB, 1.0 × 10−5mol/L) under visible light, which reached 97.2% and 88.6% at 20 °C within 40 min, respectively. Furthermore, the influence of temperature upon photocatalytic performance was also investigated. When the temperature increased from 20 °C to 45 °C, the removal of RhB decreased by approximately 53.8%. The stability of the photocatalyst demonstrated that the photocatalytic activity was still above 80% for the removal of RhB after 3 cycles. Above all, this work provided an intelligent thermally responsive photocatalyst based on phthalocyanine for water purification under visible light.

Synthesis of ZnPc/BiVO4 Z-Scheme Heterojunction for Enhanced Photocatalytic Degradation of Tetracycline Under Visible Light Irradiation

Lulu Zhong,Liuyun Chen,Xinling Xie,Zuzeng Qin,Tongming Su

The construction of semiconductor heterojunctions is an effective strategy to improve the photocatalytic degradation efficiency of organic pollutants. Herein, ZnPc/BiVO4Z-scheme heterojunction was synthesized via a physical mixing method and was used for the photocatalytic degradation of tetracycline (TC) under visible light irradiation. Compared with BiVO4and ZnPc, the 15ZnPc/BiVO4sample exhibited improved light absorption capacity, and the electron-hole separation efficiency and redox capacity were enhanced due to the formation of the Z-scheme heterojunction. The 15ZnPc/BiVO4composite exhibited an optimal TC degradation rate of 83.1% within 120 min. Additionally, 15ZnPc/BiVO4exhibited excellent stability in cycling experiments, which maintained a high TC degradation rate of 79.5% after four cycles. Free radical trapping experiments indicated that superoxide radicals (·O2−) were the main active substances in the photocatalytic degradation of TC.

Enhanced photoactivity of ZnPc@WS2 heterojunction by CuBi2O4 and its application for photoelectrochemical detection of 5-formyl-2′-deoxycytidine

Qian Wang,Huanshun Yin,Jia Ding,Xi Fang,Yunlei Zhou,Shiyun Ai

The endogenous epigenetic marker 5-formylcytosine (5 fC) is introduced by 5-methylcytosine (5 mC) oxidation under action of enzyme oxidation, and plays an important role in many life activities. Since the content of 5 fC in mammalian tissues and cells is very low, it is necessary to exploit a sensitive and specific detection method to further understand the function of 5 fC. In this work, a sensitively and selectively photoelectrochemical (PEC) biosensor was developed for 5-formyl-2′-deoxycytidine (5fdC) detection. CuBi 2 O 4 /ZnPc@WS 2 was used as photoactive material, where the formed ternary heterojunction structure greatly enhanced the PEC response and increased the detection sensitivity. Positively charged polyethyleneimine (PEI) was employed as 5fdC recognition and capture unit, where the amine group on PEI specifically reacted with aldehyde group of 5fdC to form stable amide bond. 4-Carboxyphenylboronic acid (4-CPBA) was adopted as crosslinker for 5fdC and amino functionalized CuBi 2 O 4 based on the covalent interaction between 1,3-diol bond on 5fdC and boric acid structure on 4-CPBA, and the covalent interaction between –COOH on 4-CPBA and –NH 2 on amino functionalized CuBi 2 O 4 . On the basis of the positive synergistic effect of ZnPc and CuBi 2 O 4 on improving the photoelectric performance of WS 2 , the separation of photo-generated electron-hole pairs in semiconductors were promoted, and the examination range was expanded from 0.1 to 500 nM, and the detection limit was 0.0483 nM (3σ). Based on the unique covalent reaction between –NH 2 and –CHO, the PEC biosensor has excellent detection sensitivity, and can even separate 5fdC from 5-methylcytosine deoxyribonucleoside and 5-hydroxymethylcytosine deoxyribonucleoside. The effect of antibiotics and heavy metals on the 5fdC content in wheat tissue genome has also been further investigated using this sensor.

Oxygen concentration dependent studies reveal the Stern-Volmer constant KSV of ZnPc

Lu Li,Feng Qin,Yongda Wang,Lixin Peng,Zhiguo Zhang,Tao Jia

The determination of the Stern-Volmer constant ( K SV ) for photosensitizers, a key parameter for characterizing energy transfer efficiency to oxygen, enables the understanding and optimization of photosensitizer functionality. In this study, a strategy was proposed for determining the K SV by replacing the analysis of the oxygen-dependent behavior of fluorescence intensity with a direct correlation between singlet oxygen quantum yield (Φ Δ ) and molecular oxygen. Zinc phthalocyanine (ZnPc) was selected for this work due to its promising photosensitizing properties. Through theoretical analysis using the rate equation model and experimental absorption measurements, the K SV of ZnPc was found to be 2.4(2) μM −1 . To verify the accuracy of the K SV , an oxygen-varying correlated fluorescence methodology was applied, reinforcing the reliability of the results. In addition, the determination of the K SV is achievable even in the absence of specific Φ Δ values and without the use of a standard reference.

Engineering a Stable Ti3C2Tx MXene/ZnPc Heterojunction for Selective Room-Temperature Ammonia Sensing

Yuanyuan Zhou,Song Li,Qingyang Xiao

The reliable detection of ammonia (NH₃) at room temperature (RT) remains a critical challenge for applications in industrial safety and agricultural Internet of Things (IoT), where sensors must combine high sensitivity with robust stability against environmental interference. To address this, we engineered a stable chemiresistive heterojunction by integrating zinc phthalocyanine (ZnPc) nanoparticles with highly conductive two-dimensional (2D) Ti₃C₂T_x MXene nanosheets. Comprehensive characterization, including scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), confirms the successful formation of an intimate interface, which facilitates effective charge transfer. The optimized sensor demonstrates a response of ~25% to 100 parts per million (ppm) NH₃ at 25°C, a fivefold enhancement over pristine MXene, along with excellent selectivity against common volatile organic compounds (VOCs). Crucially, the device exhibits outstanding repeatability and maintains stable performance across a wide relative humidity (RH) range (20-80% RH), directly addressing key practical deployment hurdles. The enhanced performance is attributed to the synergistic combination of specific NH₃ adsorption at ZnPc molecular sites and efficient charge modulation through the conductive MXene network. This work provides a viable and manufacturable strategy for fabricating selective, stable, and room-temperature-operating gas sensors ready for integration into real-world monitoring systems.

Synthesis of MPB@ZnPc Nanomaterials and Their Application in the Treatment of Periodontitis

Qingyue Tan,Xuan Zhang,Yujuan Tian,Rui Li

Periodontitis treatment remains challenging due to incomplete removal of plaque biofilms, increasing antibiotic resistance, and dysregulated host inflammatory responses. In this study, an MPB@ZnPc nanomaterial was constructed to achieve efficient antibacterial activity through the synergistic effects of photothermal therapy (PTT) and photodynamic therapy (PDT), while also exerting immunomodulatory functions under dark conditions. MPB@ZnPc (mesoporous Prussian blue @ zinc phthalocyanine) was synthesized using a polymer-templating method and systematically characterized. The results demonstrated that the nanomaterial exhibited excellent photothermal conversion efficiency and stability under near-infrared (NIR) irradiation. It also showed strong photocatalytic degradation performance toward methylene blue and rhodamine B, accompanied by substantial reactive oxygen species (ROS) generation. In vitro antibacterial assays revealed that MPB@ZnPc achieved significantly enhanced antibacterial efficacy compared with individual components, with bactericidal rates of 99.61 ± 0.52% againstPorphyromonas gingivalisand 99.77 ± 0.32% againstFusobacterium nucleatum. The corresponding biofilm removal rates reached 93.60 ± 3.30% and 93.25 ± 3.30%, respectively. Under dark conditions, the nanomaterial exhibited good biocompatibility toward L929 cells and effectively inhibited lipopolysaccharide (LPS)-induced M1 polarization of macrophages, leading to reduced expression of pro-inflammatory cytokines, includingIL-1β,IL-6, andTNF-α. Mechanistically, MPB@ZnPc suppressed the activation of the NF-κB signaling pathway. Overall, MPB@ZnPc provides a promising strategy for precise periodontitis treatment by integrating synergistic antibacterial activity with immunomodulatory effects.

Facile Synthesis of ZnPc-Polydopamine Co-loaded Nanoparticles for Synergetic Photodynamic-Photothermal Therapy

Jinglei Qin,Lanying Guo,Tingyu Yang,Xi Wu,Zhi Wang,Fang Xie,Hongshang Peng

Graphical A novel dopamine-modified epoxysilane was synthesized via a ring-opening reaction. Then, the photosensitizer ZnPc and photothermal-agent polydopamine were simultaneously introduced into nanoparticles by a facile encapsulation-reprecipitation method. The nanoparticles exhibited high photothermal conversion efficiency (η = 46.4%) and suitable photostability, apart from the capacity of 1 O 2 generation (Φ Δ =0.28). Based on the nanoparticles, improved therapeutic efficacy against tumor cells was achieved with synergetic treatment of PDT/PTT, even under hypoxia. A major obstacle to clinical photodynamic therapy (PDT) is tissue hypoxia in a solid tumor, which substantially reduces therapeutic efficacy by insufficient oxygen supply. To tackle this issue, herein, we reported a type of facilely prepared multifunctional nanoparticles (NPs) for combined treatment of PDT and photothermal therapy (PTT). A novel dopamine-modified epoxysilane (GSDA) was firstly synthesized from 3-glycidoxypropyl(trimethoxy) silane and dopamine via ring-opening reaction, which was subsequently incorporated into NPs along with zinc(II) phthalocyanine (ZnPc) via a reprecipitation-encapsulation method. Interestingly, polydopamine (PDA) was found to be automatically developed inside NPs by oxidative polymerization of dopamine monomers. Owing to strong-light-absorption PDA and ZnPc, the resultant biocompatible NPs exhibited high photothermal conversion efficiency (η=46.4%) and a decent singlet oxygen quantum yield (ΦΔ=0.28), respectively, under the irradiation of 808 nm and 660 nm light. Synergetic treatment was then performed on tumor cells using the multifunctional NPs, i. e., PDT followed by PTT, and enhanced phototherapeutic efficacy was achieved, particularly in the case of hypoxia. This work demonstrates that (i) the newly-synthesized GSDA might function as a bi-functional coupling agent for silica and PDA coating, and (ii) the simply-prepared NPs are very promising for synergetic PDT/PTT of solid tumors.

ZnPc/CsPbBr3 QDs collaborative interface modification to improve the performance of CsPbBr3 perovskite solar cells

Li Zou,Xiaoyan Li,Meili Yang,Jiahao Yan,Jiaming Wang,Jiajie Cheng,Jie Xing,Hao Liu,Huiying Hao,Jingjing Dong

Carbon-based, all-inorganic CsPbBr 3 perovskite solar cells (PSCs) have attracted considerable interests because of their superior environmental stability, simple and low-cost fabrication process. However, the large energy barrier and high defect states at the CsPbBr 3 /Carbon interface will cause poor carrier extraction and serious carrier recombination, which further degrade performance of final devices. In this work, we introduce zinc phthalocyanine (ZnPc), CsPbBr 3 quantum dots (QDs), and ZnPc mixed CsPbBr 3 QDs in proper proportion as the CsPbBr 3 /carbon interface modification layers of CsPbBr 3 PSCs. It is found that the modification layers, especially the ZnPc mixed CsPbBr 3 QDs modification layer, can passivate trap states, improve interface contact and optimize energy level alignment at the CsPbBr 3 /carbon interface, which can further enhance carrier extraction, suppress carrier recombination and improve performance of final devices. By virtue of ZnPc mixed CsPbBr 3 QDs modification, a highest efficiency of 10.20% and long-term stability over 6 months has been achieved.

ZnPc-MWCNT/sulfonated poly (ether ether ketone) composites for high-k and electrical energy storage applications

Wenhan Xu,Yunhe Zhang,Gang Yang,Xiang Yu,Jie Liu,Zhenhua Jiang

Core–Shell Rare Earth Nanoparticles for Photochemo-Dynamic Cancer Theranostics under NIR Excitation

Ziyue Ju,Zhan Wang,Yaqi Shi,Xiaojie Xu,Ruichan Lv

Photodynamic therapy (PDT) is an effective strategy for cancer treatment, which offers advantages such as rapid effectiveness, low toxicity, and minimal trauma. However, one of the key components of PDT, photosensitizers, typically requires excitation by ultraviolet or visible light to function, which limits the application of this therapy to some extent. To address the above issues, in this research, a composite material UCNPs@SiO2–ZnPc-Fe(OH)3 (USZ-Fe(OH)3) was prepared for photochemo-dynamic therapy (PCDT) based on rare earth upconversion nanoparticles (UCNPs). To enhance the upconversion fluorescence intensity, a layer of inert shell was coated on the original nanoparticles, resulting in core–shell–shell-structured UCNPs of NaYF4:Yb,Er@NaYF4:Nd@NaYF4. A layer of SiO2 was coated on the above UCNPs in order to improve their biocompatibility, followed by loading the photosensitizer ZnPc to prepare UCNPs@SiO2–ZnPc (USZ) for PCDT of oral squamous cell carcinoma (OSCC). Finally, Fe(OH)3 was loaded on the surface of USZ through electrostatic adsorption to obtain USZ-Fe(OH)3, with the aim of improving the hypoxic environment in solid tumors and achieving the effectiveness of PCDT. In vitro and in vivo experiments demonstrated the composite material USZ-Fe(OH)3 exhibited excellent therapeutic effects in PCDT for OSCC. Moreover, a deep learning model of the ResNet18 network was used to detect the pathology of the tumor area from mice treated with PCDT and those from the control group. All of the results indicate the proposed PCDT platform in this work presented excellent performance in tumor treatment.

Synthesis of Hemoglobin Conjugated Polymeric Micelle: A ZnPc Carrier with Oxygen Self-Compensating Ability for Photodynamic Therapy

Shasha Wang,Fang Yuan,Kui Chen,Gaojian Chen,Kehua Tu,Hongjun Wang,Li-Qun Wang

Photodynamic therapy (PDT) is a promising singlet oxygen (1O2) mediated clinical treatment for many tumors. As the source of 1O2, oxygen plays an important role in the curative effect of PDT. However, the facts of photochemical depletion of oxygen and the intrinsic hypoxic microenvironment of tumors remain the major challenges. In this work, a novel photosensitizer carrier with oxygen self-compensating ability was designed for PDT. It was synthesized via chemical conjugation of hemoglobin (Hb) to polymeric micelles formed by triblock copolymers of poly(ethylene glycol)-block-poly(acrylic acid)-block-polystyrene (PEG-b-PAA-b-PS). The PEG-b-PAA-b-PS and resultant micelles in aqueous solution were comprehensively characterized by means of FTIR, 1H NMR, GPC, DLS, TEM, and fluorescence spectroscopy. The oxygen-binding capacity and antioxidative activity of the Hb conjugated micelles were evaluated via UV–vis spectroscopy. In addition, compared with the control micelles without Hb, the Hb conjugated photosensitizer carrier was able to generate more 1O2 and exert greater photocytotoxicity on Hela cells in vitro.