WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 6
·1-12
·
IF 3.8
Li Haiyang,Li Xiaran,Quan Fengyu,Chen Zhaojun,Xia Yanzhi,Xiong Zhong
Multifunctional adsorbents are significant for the treatment of water-soluble dyes in contaminated aquatic systems and oily dyes in colored organic effluents. However, the existing adsorbent for both water-soluble and oil-soluble dyes is rare and the cleanup effect is not ideal. In this study, alginic acid carbon aerogel (AACA) as an effective wide-spectrum adsorbent was prepared through wet-spinning, ion-exchanging, drying, and high-temperature carbonization. AACA obtained a specific surface area of 1046.0 m 2 g −1 and a mean pore size of 2.82 nm. The adsorption capacities of AACA for methylene blue (cationic dye), methyl orange (anion dye), and oil red O (oil-soluble dye) were 493.5, 389.5, and 244.2 mg g −1 , respectively, which were improved in comparison with those of previously reported calcium alginate and ferric alginate carbon aerogels. The adsorption kinetics of AACA for the three dyes were fit for the pseudo-second-order kinetic model and the adsorption isotherms could be explained by the Langmuir model. ACCA revealed good adsorption performance for other eleven different sorts of dyes and binary dye systems. The adsorption mechanism was mainly confirmed to be π–π interactions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2021
·Vol. 21
·期 24
·8292
·
IF 3.576
Kaixuan Li,Ding Li,Yan Zhang
Applications of terahertz time-domain spectroscopy (THz-TDS) in the fields of chemistry and biomedicine have recently received increased attention. Specifically, THz-TDS is particularly effective for the identification of alkaloid molecules, because it can distinguish the vibration types of base molecules in the THz band and provide a direct characteristic spectrum for the configuration and conformation of biomolecules. However, when THz-TDS technology is used to identify alkaloid molecules, most of them are concentrated in the 0.1–3.0 THz band, limiting the amount of information that can be obtained. In this work, a wide-spectrum THz-TDS system was independently built to explore the absorption spectra of uracil and its 5-substituents in the range of 1.3–6.0 THz. We found that, in the THz band, uracil and its 5-substituents have similar absorption peaks near 4.9 and 3.3 THz, while the 5-substituents have an additional absorption peak in the range of 1.5–2.5 THz. This absorption peak is red-shifted as the relative atomic mass of the 5-substituted atoms increases. Gaussian software was adopted to calculate the absorption spectra of the samples. The simulation conclusions were in good agreement with the experimental results, revealing that the vibration of the base molecule at low frequencies can be attributed to the inter-molecular vibration. This work demonstrates that THz-TDS technology can be used to accurately identify biomolecules with similar molecular structures, reflecting the importance of molecular structure in biological activity.Keywords:terahertz time domain spectroscopy;absorption peaks;5-substituents of uracil;vibration;broad spectrum;molecular structures
研究领域:
化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiayu Gu,Chen Wei,Jinhao Xu,Xiu Zhang,Chunjie Zhu,Da Teng,Leyi Liu,Meizhi Lan,Wenjing An,Yingying Xu,Pengxiang Qiu,Shuxian Hu
This study demonstrates a strategic paradigm in photocatalytic nitrogen fixation by engineering semiconductor hole oxidation dynamics to circumvent ammonium degradation. Diverging from conventional approaches focused on light absorption and carrier mobility enhancement, we develop a sacrificial agent-free system leveraging attenuated hole oxidation capacity to fundamentally suppress oxidative depletion of NH 4 + . Bi 2 O 2 Se (BOS) serves as an archetypal catalyst, revealing mechanistic correlations between weak hole oxidizing environments and nitrogen reduction efficiency. Experimental analyses confirm BOS's superior performance over traditional photocatalysts, attributed to its intrinsic capacity to prevent NH 4 + oxidation while enabling effective product enrichment. Remarkably, the catalyst maintains equivalent nitrogen fixation efficiency in ambient air and inert atmospheres, demonstrating exceptional oxygen compatibility. Furthermore, BOS exhibits panchromatic photon utilization extending into near-infrared regions (AQE = 0.12 % at 700 nm). The unmodified bulk-phase characteristics of BOS highlight its inherent catalytic superiority, challenging conventional modification-dependent catalyst design frameworks. This work establishes oxidation potential modulation as a critical determinant in photocatalytic nitrogen fixation while providing a material platform and conceptual blueprint for sustainable ammonia synthesis technologies.
研究领域:
催化化学
·
材料科学
·
光化学
·
能源化学
·
环境科学
·
半导体物理
·
可持续技术
✓ 已验证
产品关联
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2017
·Vol. 43
·期 1
·423-432
·
IF 0.865
Yamani Zain Hassan
While most technologists use lamp light for the evaluation of catalysts synthesized for photocatalytic processes, some researchers prefer laser light. To conform in judgement, a comparative study of photocatalytically degrading methylene blue is reported, using a model catalyst Degussa P25, under different energies of 355 nm pulsed laser and under lamp (visible light and broader lamp light) irradiations. The used amounts of Degussa P25 after each batch of experiments were characterized by X-ray diffractometry, BET surface area analysis, field emission scanning electron microscopy, energy dispersive X-ray spectrometry and diffuse reflectance spectroscopy. The spectral photocatalytic degradation efficiencies, between broad lamp light and UV pulsed laser light, were comparable. Larger and spherical nanoparticles formation and reduction of BET surface area were noticed under pulsed UV laser beam irradiation of Degussa P25, while such trends were not observed under lamp irradiation for similar incident light intensities. The carbon contents on the surface, even after calcination of used samples at \(500\, ^{\circ }\) C, and the red shift in absorption spectra, were recorded in Degussa P25 used samples for both pulsed UV laser and lamp photocatalysis. Moreover, no change in the phases of Degussa P25 resulted under either types of irradiations during photocatalysis evaluation.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
表面科学
·
分析化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Lei Bao,Zihan Ji,Hongning Wang,Ruoyu Chen
Antireflective coatings with superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength have important practical value. In this research, hollow nanorod-like MgF2 sols with different void volumes were prepared by a template-free solvothermal method to further obtain hollow nanorod-like MgF2 crystals with an ultralow refractive index of 1.14. Besides, a MgF2 coating with an adjustable refractive index of 1.10–1.35 was also prepared by the template-free solvothermal method. Then through the combination of base/acid two-step-catalyzed TEOS and hydroxyl modification on the surface of nanosilica spheres, the SiO2 coating with good mechanical strength, a flat surface, and a refractive index of 1.30–1.45 was obtained. Double-layer broadband antireflective coatings with an average transmittance of 99.6% at 400–1400 nm were designed using the relevant optical theory. After the coating thickness was optimized by the dip-coating method, the double-layer antireflective coatings, whose parameters were consistent with those designed by the theory, were obtained. The bottom layer was a SiO2 coating with a refractive index of 1.34 and a thickness of 155 nm, and the top layer was a hollow rodlike MgF2 coating with a refractive index of 1.10 and a thickness of 165 nm. The average transmittance of the obtained MgF2–SiO2 antireflective coatings was 99.1% at 400–1400 nm, which was close to the theoretical value. The hydrophobic angle of the coating surface reached 119° at first, and the angle further reached 152° after conducting surface modification by PFOTES. In addition, because the porosity of the coating surface was only 10.7%, the pencil hardness of the coating surface was 5 H and the critical load Lc was 27.05 N. In summary, the obtained antireflective coatings possessed superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Qifeng Chen,Yu Yao,Shuo Zheng,Qianhong Shen,Libei Jiang,Qinhua Fang,Hui Yang
A novel Yb 3+ /Er 3+ co-doped BiOBr photocatalyst with 3D flowerlike hierarchical architectures were successfully fabricated through self-assembled process without any templates under hydrothermal conditions, and the structure and properties of the photocatalysts were characterized. The results indicate that Yb 3+ ions and Er 3+ ions are successfully doped into the lattice of BiOBr, and the as-obtained photocatalyst can respond the NIR light and emit red and green light due to the up-conversion effect of the rare-earth ions. Meanwhile, with co-doped Yb 3+ /Er 3+ ions content increasing, oxygen vacancy concentration in the photocatalyst rises. The oxygen vacancy will form the intermediate energy band, which can decrease the photon energy required for electronical transition, and thus help to utilize the luminous energy generated by up-conversion luminescence. Moreover, the appropriate introduction of defects (oxygen vacancy defect and impurity atom) can further promote the transfer and separation efficiency of photo-generated carriers. Hence, Yb 3+ /Er 3+ co-doped BiOBr photocatalyst exhibits enhanced photocatalytic properties under broad spectrum (UV/vis/NIR) excitation, which is about 4 times as high as that of pure BiOBr.
研究领域:
材料科学
·
光催化
·
纳米技术
·
光电
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2025
·Vol. 34
·期 8
·088501
·
IF 1.5
Leyao Wu,Xinnan Shi,Haibo Fan,Qiujie Li,Peng Hu,Feng Teng
Traditional Si-based photoconductive detectors face problems such as low response in the ultraviolet (UV) and infrared regions, high dark current, and low light absorption efficiency, which seriously limit their applications in the field of high-performance wide-spectrum detection. In this study, a self-powered broadband photodetector based on a Si/TiO2 heterojunction is proposed. The detector has a pyramidal structure. By constructing a pyramidal microstructure on the surface of silicon, the light capture and absorption efficiency is significantly improved, representing a breakthrough in response performance in the visible and near-infrared (NIR) bands. In order to further enhance the photoelectric response in the UV band, a TiO2 layer was coated on the surface of the silicon pyramid through a simple spin-coating method and annealing process. The introduction of TiO2 effectively broadened the spectral response range of the photoelectric detector and further improved the light absorption of the device. Meanwhile, due to the built-in electric field formed by the n-TiO2/p-Si heterojunction, the dark current was effectively reduced, and the responsivity was improved. Experiments showed that the device exhibits high responsivity, high detectivity, and relatively low dark current in the range of 365–1305 nm. Under light at 780 nm, the device’s on–off ratio reached 2.7 × 103; its specific detectivity, D*, was 3.9 × 1011 Jones; and its responsivity reached 0.174 A/W. In addition, this detector does not require the assistance of expensive equipment. Its preparation process is simple and inexpensive, and there is no need for an external power supply, which gives it broad application potential in wearable devices, environmental monitoring, communications, biosensing, and other fields. This study provides a brand-new strategy for the design of new wide-spectrum detectors.
✓ 已验证
产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Jijie Zhao,Huan Liu,Lier Deng,Weiguo Liu,Bin Sun,Bin Liu,Xiangqian Wang,Xiaoping Gao
Lead sulfide (PbS) colloidal quantum dots (CQDs) are widely used due to their tunable bandgap and high compatibility in composite integration with silicon, expanding the spectral response range of silicon-based photodetectors from visible light to short-wave infrared. The silicon dangling bonds were effectively passivated through CH3I, and the band alignment at the heterojunction interface was adjusted. It reduces electron recombination at the interface, thereby achieving a broad spectral response of silicon-based PbS CQDs heterojunction photodetectors spanning from 380 nm to 1600 nm. As per the research findings, Si:PbS CQDs photodetectors passivated with CH3I showcase impressive characteristics with a rectification ratio of 1.2× 102 and a high on-off ratio of 3.1× 103. These characteristics underscore a remarkable photovoltaic effect within the detectors. The detector achieves an average external quantum efficiency of 37% in the visible and short wave infrared spectrum. At 1470 nm, the responsivity of the Si:PbS CQDs photodetector reaches 0.22 A/W, with a detectivity of 3.3×1011 Jones, marking a 28-fold increase compared to the Si:PbS CQDs photodetector without CH3I passivation. This work offers a new strategy for manufacturing low-cost, high-performance PbS CQDs photodetectors compatible with silicon arrays.
研究领域:
光电子学
·
纳米技术
·
半导体物理
·
材料科学
·
红外探测
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Linjing Wang,Feng Chen,Biao Zhou,Huihua Xu,Jianxin Meng,Fengyu Li
High-performance, broad-spectrum detection spanning the visible to the near-infrared region is critical for applications such as image sensing, optical communications, and health monitoring. Although inorganic/organic hybrid phototransistors (HPTs) have been explored for such applications, a universal design strategy for material combinations and a thorough understanding of the gate-modulated photocurrent generation mechanism in these HPTs are still required. In this work, we demonstrate an inorganic/organic HPT by integrating a high-mobility, solution-processed amorphous metal oxide semiconductor with a photosensitive organic bulk heterojunction. Thanks to the rational type-II band alignment, this heterostructure efficiently decouples carrier generation and transport processes, thus introducing a photogating effect. By strategically gate-modulating the dominant photocurrent generation mechanism from photoconductive to photogating effects, the device achieves a maximum sensitivity of ∼104, specific detectivity of 1.5 × 1012 Jones, and responsivity of 1.0 × 104 A W–1 under 808 nm illumination. Furthermore, the HPT also exhibits a broadband photodetection capability as well as excellent operational stability in an ambient environment. These attributes make our HPT a sensitive detection unit for pulse oximetry sensing without requiring any external amplification circuits. The results of this study highlight the potential of this hybrid design approach for tailoring optoelectronic properties, thus offering a promising pathway for practical applications demanding weak signal detection across broad spectral ranges.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Communications Materials
·
2020
·Vol. 1
·期 1
·1-10
·
IF 0
Jin Zhengyuan,Jiang Xiantao,Zhang Qitao,Huang Shaolong,Zhang Luhong,Huang Lili,He Tingchao,Zhang Han,Ohno Teruhisa,Ruan Shuangchen,Zeng Yu-Jia
Broad-spectrum light activation in photocatalytic materials is considered vital for effective solar-to-hydrogen energy conversion. Here, we propose an upconversion process in oxygen-doped polymeric carbon nitride (C 3 N 4 ) nanosheets, resulting in high photocatalytic activity for hydrogen generation from water splitting under infrared light irradiation. Due to the upconversion, the photoexcited electrons are transferred to the conduction band, and a σ* carbon-oxygen orbital localized on the triazine matrix ring resulting from oxygen doping extends the lifetime of photogenerated electrons, which increases the photocatalytic activity under both infrared and visible light. Our material exhibits high apparent quantum efficiency of 0.014% and 23% at 850 nm and 420 nm, respectively. Under infrared light (λ ≥ 800 nm, 24 mW cm −2 ), the hydrogen production rate of our material is 22.84 μmol h −1 g −1 , which can reach a yield similar to that of pristine C 3 N 4 under visible light.
研究领域:
材料科学
·
化学
·
可再生能源
·
光催化
✓ 已验证
DOI
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zhengdong Liu,Jicai Wu,Yang Zeng,Kexin Wang,Xiujuan Li,Shaohua Wang,Zhenyu Zhang,Chaoran Huang,Fa Zhang,Juqing Liu,Wei Huang
Ionic gels are emerging stimuli-response elastomers for biomimetic sensors in diverse fields. Photoresponse ionic gels can detect light as a photoreceptor to emulate biological vision for artificial retina and skin. However, the existing ionic gel-based photosensors face limited response speeds and detecting sensitivity due to inefficient ion transport. Here, a high-performance elastomeric photodetector made of polyvinyl alcohol-based pyroelectric eutectogels, containing polar ions and crystalline domains, is reported, which exhibits a high pyroelectric coefficient and enables efficient optical-to-electrical conversion via spontaneous polarization, even under 30% tensile strain. The resulting self-powered photodetector features a broad spectral response spanning 365–1300 nm, with photoresponsivity, detectivity, and response time of 42.06 mA W −1 , 7.65 × 10 10 Jones and 24/35 ms at 455 nm, respectively. The photodetector array enables light-encrypted communication and sensitive optical imaging.
研究领域:
材料科学
·
光电子学
·
传感器
·
柔性机器人
·
能量收集
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Iranian Chemical Society
·
2025
·
IF 2.3
Wang Liping,Tao Xin,Ruan Yuxian,Yu Ying,Wang Zhijuan,Ming Yingchun
Photocatalytic water splitting has emerged as a pivotal strategy to tackle global energy crises and environmental degradation by producing clean hydrogen. In this study, a novel Cu 2 O/CuO/C composite photocatalyst was prepared from cupric nitrate trihydrate and 1,3,5-benzenetricarboxylic acid via the two-step solvothermal-calcination method as the photocatalyst for hydrogen evolution. Advanced characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), transient photocurrent responses, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and Mott-Schottky test, confirmed the composite's excellent visible and near-infrared light absorption and Z-scheme heterojunction architecture. Its remarkable performance originates from the effective p-n heterojunction formed between Cu 2 O and CuO. Upon a 300 W xenon lamp (350 < λ < 780 nm) illumination, photogenerated electrons and holes are produced in Cu 2 O and CuO, respectively. Electrons from the conduction band (CB) of CuO migrate to the valence band (VB) of Cu 2 O, recombining with holes. This mechanism not only enhances charge separation and extends carrier lifetime but also preserves the strong reducing capability of Cu 2 O, significantly boosting photocatalytic activity. The composite achieved a hydrogen production rate of 511.07 μmol/(g h). Notably, it retained stable performance over three consecutive cycles without significant activity loss, demonstrating robust durability. These findings highlight the potential of Cu 2 O/CuO/C Z-scheme heterojunctions as efficient, stable photocatalysts for sustainable hydrogen evolution.
研究领域:
能源转换
·
材料科学
·
环境科学
·
可再生能源
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）