Applied Materials Today
·
2024
·
IF 7.2
Shushu Miao,Yue Xing,Xu Li,Bing Sun,Zheyuan Du,Hongshuo Cao,Pengfei Guo,Yincheng Chang,Yanhong Tian,Minghui Yao,Ke Chen,Dengbao Xiao,Xuejun Zhang,Biao Zhao,Kai Pan,Jiangman Sun,Xiubing Liang
For the intelligent 4D-printed actuators, the excellent performance, including quickly reversible spatial-shape transformation and locking, digital and precise shape manipulation in real-time, and remote actuation in special spaces or harsh environments, is significantly desirable but still challenging. Here, using a UV-curable system containing the shape memory polymer (SMP) and NdFeB particles, namely the magSMP composite, we fabricate a real-time reprogrammable soft actuator via high-resolution Digital Light Processing (DLP)-based 4D printing. The printed structure is composed of an array of physical binary magSMP composite elements (m-bits), analogous to digital bits. Owing to the NdFeB's photothermal effect, each m-bit can be independently and reversibly switched between unlocking or locking states (allowing or prohibiting responsive shape-morphing) in response to the on/off state of NIR-II light. Through projecting NIR-II light patterns for encoding a set of binary instructions onto 4D-printed actuators, the real-time light-programmed deformations are induced precisely under an actuation magnetic field due to the NdFeB's huge coercivity. Thus, the synergistic magnetic and light field-manipulated multimodal deformations of actuators, including mimosa shape changing, grasping, and wire guiding, are achieved. This study shines lights on the fabrication of soft structures of arbitrary sizes and provides their future perspectives in soft robot design.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Aqiang Liu,Zheng Zhang,Jing Li,Hui Yu,Nana Wang,Jianpu Wang,Ni Zhao
The halide postdeposition treatment technique is a widely used strategy for mitigating defects in perovskite. However, when applied to mixed-halide perovskites, it often leads to surface and internal halide heterogeneity, which compromises luminescence performance and spectral stability. In this work, blue mixed-halide 3D perovskites are engineered with acetate (Ac⁻)-rich surfaces to optimize the post-treatment process and achieve halide homogeneity. The findings demonstrate that the strong interaction between surface Ac⁻ ions and Pb 2+ ions significantly reduces the formation of halide vacancy defects caused by the washing effect of isopropanol during post-treatment. This defect reduction slows the infiltration of halide ions into the perovskite lattice, providing more time for surface reconstruction and minimizing the accumulation of introduced halide ions at the surface. As a result, a mild halide redistribution occurs, promoting the formation of a uniform mixed-halide perovskite phase. This approach enabled the development of blue mixed-halide 3D PeLEDs with a record external quantum efficiency of 19.28% (emission peak at 482 nm), comparable to state-of-the-art blue reduced-dimensional perovskite-based PeLEDs. Additionally, the device demonstrated a narrowband and stable electroluminescence spectrum with a full width at half maximum (FWHM) of less than 16 nm.
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PubMed
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CHEMOSPHERE
·
2024
·
IF 8.1
Yulu Jia,Chengyang Zhang,Hongcen Zheng,Guoyang Zhang,Shujuan Zhang
Indirect photodegradation is an important pathway for the reduction of steroid estrogens in sunlit surface waters. Nevertheless, the kinetics and mechanisms governing the interaction between coexisting carbonyl compounds and estrogens under visible light (Vis) remain unexplored. This study systematically investigates the Vis-induced photodegradation of 17 β -estradiol (E2) in the presence of five specific carbonyl compounds—biacetyl (BD), acetone, glyoxal, pyruvic acid, and benzoquinone . The results demonstrate that, among these compounds, only BD significantly enhanced the photodegradation of E2 under Vis irradiation (λ > 400 nm). The pseudo-first order photodegradation rate constants ( k 1 ) of E2 in the Vis/BD system were 0.025 min −1 and 0.076 min −1 in ultrapure water and river water, respectively. The enhancing effect of BD was found to be pH-dependent, increasing the pH from 3.0 to 11.0 resulted in a 76% reduction in the k 1 value of E2 in the Vis/BD system. Furthermore, the presence of humic acid , NO 3 − , or HCO 3 − led to an increase of more than 35% in the k 1 value of E2, while NO 2 − exerted a pronounced inhibitory effect, resulting in a 92% decrease. Peroxyacetyl and peroxymethyl radicals, derived from BD in a yield ratio of 9, played a crucial role in the degradation of E2. These peroxyl radicals primarily targeted electron-rich hydroxyl sites of E2, initiating hydroxylation and ring-opening reactions that culminated in the formation of acidic byproducts. Notably, toxicity evaluation indicates that these hydroxylated and acidic products exhibited lower toxicity than the parent compound E2. This study highlights the important role of peroxyl radicals in estrogen degradation within aquatic environment, and also helps to design efficient visible light-responsive photo-activators for the treatment of estrogen-contaminated waters.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Minglu Zhang,Qi Yuan,Yanyan Guo,Saijin Song,Dongyu Wang,Junli Zhang,Hao-Yang Mi,Jian Han,Chuntai Liu,Changyu Shen
Planar 1D photonic crystals (1DPhCs), owing to their photonic bandgaps (PBGs) formed by unique structural interference, are widely utilized in light protection applications. Multifunctional coatings that integrate various light management functions are highly desired. In this study, we present the fabrication of dual-PBG 1DPhCs with high reflectance in both the blue and near-infrared (NIR) regions. The 1DPhCs were constructed through the alternating stacking of hollow SiO2 (HS) nanoparticles hybridized with poly(vinyl alcohol) (PVA), referred to as PHS, and TiO2 layers. The 1DPhC with 7 bilayers demonstrated remarkable reflectance of 98.2% and 93.4% in the blue and NIR spectra, respectively, with shielding efficiencies of 93.9% and 85.6%. Compared to bare PC, the temperature was observed to be 10.6 °C lower, achieving a thermal insulation efficiency of 44.8% in the 900 nm near-infrared range. Additionally, spectral fitting using the transfer matrix method (TMM) and optimization of process parameters, including PHS concentration and spin-coating speed, enabled the fabrication of 1DPhCs with tunable optical thickness ratios. The fabricated films demonstrated a smooth surface morphology with flat and uniform interfaces, as well as excellent environmental stability. These features make the 1DPhCs highly promising for applications in light protection and thermal management. This study provides a novel approach for the development of dual-PBG 1DPhCs with enhanced protective capabilities.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiangjin Zhu,Yaoyu Zhang,Yuxiong Wang,Yue Liu,Zhongbiao Wu
Indoor VOCs pollution has attracted broad attention for its harm to mankind’s health recent years. Photocatalytic degradation of indoor VOCs holds great prospects in addressing these health concerns in daily life. However, traditional photocatalysts have a large recombination rate of charge carriers and a decrease of the photocatalytic degradation efficiency under high relative humidity. Herein, uniform tungsten oxide nanoparticles with enriched oxygen vacancies (WO 3 -U) were synthesized by a direct annealing method with urea addition, which exhibited superior performance in the visible-light photocatalysis. The reaction rate constant value of photocatalytic acetaldehyde degradation over WO 3 -U catalyst was above 3 times higher than that of pristine WO 3 sample. More importantly, the WO 3 -U catalyst maintained stable and excellent photocatalytic performance at relative humidity range of 25–100 %. Except for the enhanced photogenerated charges separation, abundant oxygen vacancies could effectively accelerate O 2 activation to generate •O 2 − , which accounted mainly for the initial conversion of acetaldehyde. Then the subsequent transformation of •O 2 − into •OH to promoted the final mineralization of acetaldehyde. In addition, the presence of oxygen vacancies also facilitated H 2 O dissociation to form surface hydroxyl groups, which increased the adsorption of acetaldehyde, resulting in the consistent photocatalytic performance of WO 3 -U catalyst within a wide humidity range. This work provides guidelines to design visible-light responsive photocatalysts with efficient activity at high humidity conditions for indoor VOCs degradation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Ruyi Zhong,Zisheng Zhang,Huqiang Yi,Lei Zeng,Chao Tang,Limin Huang,Meng Gu
Visible-light photocatalytic hydrogen evolution is a key step towards utilizing solar energy. Here we constructed covalently bonded oxidized graphitic C 3 N 4 /TiO 2 (O-g-C 3 N 4 /TiO 2 ) heterostructure with high surface area via an in-situ solvothermal synthetic strategy. The edge-anchoring of two-dimensional (2D) TiO 2 on 2D O-g-C 3 N 4 was evidenced by the HAADF-STEM EDS mapping, EELS and XPS analysis. Density functional theory computations suggest strong affinity between TiO 2 and O-g-C 3 N 4 2D structures through N O Ti covalent bonding, which drastically enhances the synergetic effect of the light absorption of O-g-C 3 N 4 and high surface area of TiO 2 . The as-formed heterojunction can remarkably boost the visible-light photocatalytic activity for H 2 evolution by 6.1 times compared to physical mixture of TiO 2 nanosheets (NS) and O-g-C 3 N 4 .
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Hongjie Zhu,Zhengkui Li,Jianhua Yang
A novel hydrogel catalyst (P(HEA-co-HAM)-CdS) was synthesized to remove bisphenol A (BPA) from water through adsorption and in-situ photocatalytic degradation. The characterization of P(HEA-co-HAM)-CdS hydrogel through SEM-EDS, TEM, XPS and FT-IR demonstrated heterogeneous structure and chemical combination between CdS and hydrogel. Besides, the optical properties of P(HEA-co-HAM)-CdS hydrogel illustrated enhanced photocatalytic activity under visible light irradiation with efficient separation ability of electron-hole pairs and effective visible light utilization capability. In addition, the ability of hydrogel in adsorption and degradation were observed. BPA adsorption capacity of P(HEA-co-HAM)-CdS hydrogel was 11.26 mg/g, higher than similar adsorbents. The adsorption process fitted in pseudo-second-order rate equation and Langmuir monolayer adsorption. Under 500 W visible light irradiation, BPA degradation rate of P(HEA-co-HAM)-CdS hydrogel reached 92% in 3 h and photocatalytic oxidative radicals detection experiment verified holes (h + ) and ·O 2 − play major role in this system, mineralization rate of BPA was 47%. HPLC-TOF-MS was employed to detect the degradation intermediates, with theoretically Fed 2 value calculating results, possible degradation pathway of BPA was proposed. Furthermore, degradation rate remained over 84.4% after recycle. The results indicated that P(HEA-co-HAM)-CdS hydrogel was a promising catalyst material in application.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 4
·e4285
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IF 3.581
Zhiquan Yang,Jie Ding,Jinna Feng,Chong He,Ying Li,Xiaowen Tong,Xiaojun Niu,Hongguo Zhang
Because of their desired features, including very specific surface areas and designable framework architecture together with their possibility to be functionalized, Metal Framework (MOF) is a promising platform for supporting varied materials in respect of catalytic applications in water treatment. In this work, a novel visible-light-responsive photocatalyst that comprised BiVO 4 together with MIL-125(Ti), was synthesized by a two-step hydrothermal approach. The characterization of as-obtained samples as performed by X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, Fourier transform infrared spectroscope, X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflection spectra. Rhodamine B was selected being a target for the evaluation of the photocatalytic function of as-developed photocatalyst. The photocatalytic reaction parameters, for example, the content of BiVO 4 as well as initial concentration of Rhodamine B was researched. The composite photocatalyst possessing Bi:Ti molar ratio of 3:2 brought to light the fact that the greatest photocatalytic activity had the ability to degrade 92% of Rhodamine B in 180 min. In addition to that, the BiVO 4 /MIL-125(Ti) composite could keep its photocatalytic activity during the recycling test. The phenomenon of disintegration of the photo-generated charges in the BiVO 4 /MIL-125(Ti) composite was brought to discussion as well.
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Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Meng Li,Zipeng Xing,Jiaojiao Jiang,Zhenzi Li,Junwei Yin,Junyan Kuang,Siyu Tan,Qi Zhu,Wei Zhou
A novel plasmonic Ag decorated S-TiO 2− x nanorods are successfully fabricated under 700 °C calcination, then followed by an in-situ solid-state chemical reduction approach with NaBH 4 in a mild calcination (350 °C) and combined with photo-deposition approach. The resultant Ag/S-TiO 2− x sample with high crystallinity and narrow band gap of ∼2.39 eV, extends the photoresponse to near-infrared region. The visible-light-driven photocatalytic degradation rate of phenol and hydrogen production rate for Ag/S-TiO 2− x nanorods are as high as 98.67% and 209.2 µmol h −1 g −1 , which is about 2 and 5 times higher than that of S-TiO 2 . Especially, first-order reaction rate constant of Ag/S-TiO 2− x nanorods is 14 times higher than that of S-TiO 2 . The excellent photocatalytic property can be attributed to the synergistic effect of Ti 3+ self-doping, S doping and the enhanced surface plasmon resonance of Ag nanoparticles, which narrows the band gap, favors the visible light utilization, and promotes the separation of photogenerated charge carriers.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jing Xu,Xiangyi Shen,Duanli Wang,Chuxuan Zhao,Zizheng Liu,Ivan P. Pozdnyakov,Feng Wu,Jun Xia
The usage of p -arsanilic acid (ASA) in livestock and poultry farms leads to its release into the environment. The phototransformation of ASA generates toxic inorganic arsenic species and organic by-products, which affects the water security of the peripheral river basin. In this work, we have investigated the pH-dependent kinetics and mechanisms of ASA photolysis under Ultraviolet-C (UV-C) light (254 nm) irradiation in the pH range 1–11 in the absence of oxygen. The degradation rate of ASA, the ratio of the generated inorganic arsenic species, and the amount of primary organic by-products were determined under the aforesaid conditions. Our results clearly showed the pH-dependent photochemistry of ASA. The photolysis rate was low under acidic conditions, and As(III) and p -aminophenol were the main products. With increasing pH, the photolysis rate increased significantly, and As(V) and aniline became the main products. A pH-based kinetic model has been established that allows prediction of the generation rates of As(III), As(V), p -aminophenol, and aniline according to the photolysis rate of ASA.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xiaojie Zhang,Jipeng Yang,Tiancong Cai,Guoqiang Zuo,Changqing Tang
Boron carbide (B 4 C) nanoparticles-decorated anatase titanium dioxide (TiO 2 ) nanosheets photocatalysts were synthesized by a hydrothermal method in the presence of hydrofluoric acid and characterized by field emission scanning electron microscope, high-resolution transmission electron microscope, UV–vis diffuse reflectance spectra, photoluminescence spectra, etc. With metallic Pt nanoparticles as a co-catalyst, the as-synthesized B 4 C/TiO 2 composites were evaluated using photocatalytic CO 2 or H 2 O reduction to solar fuels such as methane and hydrogen. Under either simulated sunlight or visible light irradiation, coupling p-type B 4 C with n-type anatase TiO 2 significantly improved the photocatalytic performance. Both photoluminescence and transient photocurrent measurements indicated that the interfacial coupling effect between B 4 C and anatase TiO 2 could significantly promote photo-excited charges separations. On the basis of measurements and literatures, a possible mechanism of excited charges transfer at the B 4 C-anatase TiO 2 heterojunction interface during irradiation was deduced.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jie Ni,Jinjuan Xue,Jing Shen,Guangyu He,Haiqun Chen
The ZnAl mixed metal-oxides (MMOs)/graphene nanocomposites were successfully fabricated by a facile hydrothermal method combined with a calcination process. The thermal treatment enables simultaneously the formation of ZnO/ZnAl 2 O 4 heterogeneous structure, which are uniformly decorated on the surface of graphene, accompanying with the reduction of graphene oxide. The as-prepared heterostructure photocatalysts were well characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and UV–vis diffuse reflectance spectroscopy (DRS) to conduct investigations into the phase structures, microstructure and optical capability. The ZnAl MMO/RGO 20 composite displayed favorable adsorption property and photo-degradation efficiency for Ciprofloxacin (CIP) aqueous solution under visible light. The photo-degradation efficiency of the as-prepared ZnAl MMO/RGO 20 was 3.0 and even 4.6 times higher than that of ZnAl MMO and pure ZnAl LDH, respectively. The improvement of photocatalytic performance is ascribed to the synergistic effect of heterogeneous structure coupled with graphene, which realizes efficient charge separation efficiency, enlarged visible light adsorption range, and chemical stability of hybrid nanocomposite. The results of EIS, PL and photocurrent response also explained the best performance of ZnAl MMO/RGO 20 nanocomposite. Besides, the mechanism of ZnAl MMO/RGO 20 photocatalytic system was proposed and analyzed in detail.
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