Materials Chemistry Frontiers
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2019
·Vol. 3
·期 3
·505-512
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IF 0
Yuan Yang,Tao Wang,Pei Yin,Weidong Yin,Shaoxiong Zhang,Ziqiang Lei,Manyi Yang,Yucheng Ma,Wei Duan,Hengchang Ma
White-light emitting materials have attracted extensive research interest in recent years, which is largely ascribed to their potential applications in lighting devices and display media. Scientists have reported that organic white-light emitters mostly depend on the integration of several components that simultaneously emit different colors of light. However, it is a challenge to rationally tune the ratios of colored luminescent dyes to produce white-light emitting materials since we still cannot find the general principles to guide their preparation. In this paper, we demonstrate that “equal is important”, which means that once the emission intensities from two complementary colored luminescent dyes are equally maintained, white light emission can be generated in a range of states, including in solids, solutions, and gels. During the research process, we also found that cationic fluorescent cores are highly sensitive to the polarity of solvents. Therefore, our results could inform the design of visual indicators for the polarity and electrical conductivity of solvents using fluorescence signals.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
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IF 2.752
Zhudan Chu,Linlin Qiu,Yue Chen,Zhishan Zhuang,Pingfan Du,Jie Xiong
Recycling and rapid synthesis of photocatalysts are of significant importance in wastewater degradation. Herein, a systemic strategy was developed, employing loaded nano-TiO 2 on carbon fiber (CF) utilizing microwave hydrothermal method for the fast and efficient preparation of photocatalysts . The prepared TiO 2 /CF was characterized using a variety of analytical techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), and UV–vis. Compared with pure TiO 2 particles, TiO 2 /CF is easily recycled when employed as a photocatalyst. Nitric acid oxidation treatment of CF generates polar functional groups, which improves the bonding properties between TiO 2 and CF. With increasing CF treatment time between 0 and 4 h, the loading rate of TiO 2 increases, until TiO 2 /CF produces optimum photocatalytic activity . Moreover, the experimental results indicate that TiO 2 /CF possesses favorable photocatalytic activity, achieving 97% degradation rate of Rhodamine B within 1 h of UV light irradiation. Furthermore, even after 10 experimental cycles the photocatalyst still generates 88% degradation rate.
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Catalysis Science & Technology
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2019
·Vol. 9
·期 17
·4614-4628
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IF 5.726
Gongduan Fan,Jiajun Zhan,Jing Luo,Jin Zhang,Zhong Chen,Yifan You
Titanate nanomaterials (TNs) have been widely used in organic degradation and photocatalysis due to their large specific surface area, high activity and outstanding ion exchange capacity. However, TNs have a weak response to visible light, and the mechanism of photodegradation of PPCPs by various TNs under visible light is still poorly understood. At the same time, metal modified TNs have a potential secondary pollution problem in aquatic environments. Here, we report on an efficient TN photocatalyst modified with H2O2 (HTNM), which exhibited an enhanced photoresponse to visible light and a highly improved photocatalytic activity. The prepared samples were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area measurement, UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and X-ray photoelectron spectroscopy (XPS). The degradation effect, influencing factors, quantum yield, reaction kinetics and intermediate product transformation pathways of naproxen (NPX) degraded by the HTNM were systematically studied, and the degradation mechanism of NPX by the HTNM was also investigated. The results show that the absorption of visible light and the photocatalytic activity can be improved remarkably by H2O2-modification of TNs. Under visible light, the removal rate of NPX by the HTNM can reach 99.9% within 180 min, the degradation rate was fitted with a pseudo-first-order kinetic model, and the catalytic activity was stable. The photodegradation of NPX was inhibited by Cl−, CO32−, SO42− and NO3− in aqueous solution. Among these ions, NO3− had the greatest impact on the degradation of NPX, and the following were CO32−, SO42− and Cl−. The common humus in water, fulvic acid (FA), would decrease the degradation rate of NPX, while humic acid (HA) could promote the photocatalytic degradation of NPX. The mechanism study showed that ˙OH and O2˙− were mainly involved in the photodegradation of NPX by the HTNM, and decarboxylation and hydroxylation were the main pathways of NPX degradation. In summary, the HTNM offers a better photocatalytic degradation route compared with pristine titanate for removing NPX in aquatic environments, provides a new idea for treatment of wastewater contaminated with NPX and has a broad application prospect in aquatic environments.
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WATER RESEARCH
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2019
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IF 7.913
Wanjun Wang,Hanna Wang,Guiying Li,Taicheng An,Huijun Zhao,Po Keung Wong
The development of cost-effective water disinfection methods is highly desired to address the problems caused by outbreak of harmful microorganisms . Sulfate radical (•SO 4 − )-based advanced oxidation technology has attracted increasing attention. However, various catalysts or UV irradiation are usually used to activate persulfate (PS), which is high-cost and the recovery of nano-sized catalysts is also challenging. This work demonstrates a new method of catalyst-free activation of persulfate by visible light (VL) for bacterial inactivation. The 6-log of E. coli cells can be inactivated within 40 min and 7-log of E. coli cells could be inactivated within 120 min by the VL/PS system. The major responsive wavelength is 420 nm, and no heat activation of PS is found during VL irradiation. A synergistic effect with synergy factor of 51.2% is found when combining the VL irradiation with heating at 50 °C. The acidic pH is benefit for the VL/PS-triggered bacterial inactivation, while bicarbonate inhibits the E. coli inactivation at the range of 0.1–20 mg/L. Mechanism study indicates the main reactive species are •SO 4 − , •O 2 − and •OH, in which •SO 4 − plays the most important role. The bacterial inactivation process shows to begin from outer membrane to intracellular components. Subsequently, the antioxidant enzyme (i.e. SOD, CAT) is induced, followed by damaging to the genomic DNA leading to fatal death of the cells. In addition, the VL/PS system is also applicable for the inactivation of other pathogenic bacteria, including Staphylococcus aureus and Pseudomonas aeruginosa , showing universality for water disinfection applications. This work not only provides a new cost-effective disinfection method without a catalyst, but also sheds light on understanding the bacterial inactivation mechanism by •SO 4 − -based AOPs .
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INORGANIC CHEMISTRY COMMUNICATIONS
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2019
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IF 1.795
Yong-Hong Lin,Zhi-Hua Qiu,Shuai-Hua Wang,Xian-Hui Zhang,Shao-Fan Wu
The outstanding photovoltaic performance of perovskite nanocrystals is attracting more and more attention. However, how to obtain stable wavelength-tunable red light-emitting perovskite materials is an urgent problem to be solved for the photovoltaic application. This paper reports a kind of orange to red light-emitting rubidium‑cesium lead halide perovskite nanocrystals (Rb x Cs 1-x PbBrI 2 , x = 0 to x = 0.6). By adjusting the rubidium‑cesium ratios in the precursor solution, the peak wavelength can be tuned from 631 nm to 588 nm. The nanocrystals have narrow emission line-widths and bright photoluminescence . Furthermore, the polymer nanocrystals are prepared simply by mixing PMMA and perovskite nanocrystals solution in appropriate ratios, forming a series of stable orange to red emitting materials.
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Journal of the Iranian Chemical Society
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2019
·Vol. 16
·期 12
·2743-2754
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IF 1.742
Huang Yunfang,Xu Hui,Luo Dan,Guo Qiyao,Zhao Yuezhu,Fang Yu,Wei Yuelin,Fan Leqing,Wu Jihuai
In this work, a series of flower-like Bi/BiOCl x Br (1− x ) heterojunction photocatalysts have been developed. Bi nanoparticles were grown on the BiOCl x Br (1− x ) nanosheets via an in situ chemical reduction with the assistance of cetyltrimethylammonium chloride and cetyltrimethylammonium bromide aqueous solution. The in situ growth of Bi nanoparticles on the BiOCl x Br (1− x ) nanosheets could not only give rise to the optical absorption in the visible region, but also promote the photocatalytic performance of BiOCl x Br (1− x ) . Bi/BiOCl 0.8 Br 0.2 exhibited the highest photocatalytic performance, which could completely degrade RhB in 12 min under the UV light irradiation and 6 min under visible light irradiation, respectively. Moreover, holes and superoxide radicals were verified to be the primarily active species in the photocatalytic process.
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FERROELECTRICS
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2019
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IF 0.697
Peisong Tang,Xinyu Xie,Haifeng Chen,Chunyan Lv,Yangbin Ding
Perovskite rare-earth ferrate PrFeO3 is a new kind of photocatalytic material. Using Fe(NO3)3·9H2O, Pr(NO3)3·6H2O, citric acid and urea as main raw materials, the gel of PrFeO3 was prepared by sol–gel method. The gel was kept at 80 °C for 48 h to make xerogel. Then, the xerogel was calcined in muffle furnace at 800 °C to obtain PrFeO3 samples. The structure and morphology of samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and UV–visible diffuse reflectance spectroscopy (DRS). The results showed that the perovskite structure PrFeO3was obtained through sol–gel method. The resulting products have a particle size of 80 nm and an optical band gap of 2.4 eV. Consequently, the PrFeO3 nanoparticles showed high photocatalytic activities for decomposition of methyl orange under visible-light irradiation. The PrFeO3 samples are consistent with first-order kinetics for the degradation of methyl orange. And the apparent rate constants is k = 0.071 min−1.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Kangxu Zhao,Xuan Zheng,Huijun Zhang,Menghan Xu,Shan Wang,Quanling Yang,Chuanxi Xiong
Carbon dots (CDs) have been applied in numerous fields by virtue of their excellent features. Multi-color fluorescent carbon dots with high photoluminescence (PL) quantum yield are still the emphases for research. Here, by using 3,5-diaminobenzoic acid and 3,4-diaminobenzoic acid, multi-color-red, green, blue (RGB) emitting CDs (RGB-CDs) were successfully synthesized via a one-pot solvothermal route. The RGB-CDs exhibited stable optical properties and significant photoluminescence characteristics with excitation-independent. Structure and element analysis indicated that conjugated graphite structure of carbon cores and oxygen on surface states were responsible for the RGB color emissions of carbon dots. Moreover, RGB-color and white light-emitting diodes (LEDs) were fabricated by these multi-color fluorescent carbon dots. The LEDs exhibited excellent lighting performance, indicating that these RGB-CDs have the potential to substitute rare elements for solid-state optoelectronic applications .
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ACS Omega
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2019
·
IF 2.584
Ruijie Yang,Kelin Song,Jiansheng He,Yingying Fan,Rongshu Zhu
In this work, the study of photocatalytic hydrogen production by RGO/ZnIn2S4 with simultaneous degradation of organic amines was carried out in the presence of organic amines in wastewater as the sacrificial agents. The effects of several factors, such as organic amine types, pH value, catalyst concentration, organic amine concentration, and sunlight source, on the photocatalytic activity of RGO/ZnIn2S4 for H2 production were investigated. At the same time, its performance of degrading organic amines during H2 production was also examined. The results showed that the order of H2 production activity of RGO/ZnIn2S4 in six organic amine solutions was N(CH2CH3)3 > N(HOCH2CH2)3 > N(CH3)3 > HO(CH2)2NH2 > C6H5–N2> CO(NH2)2, and the highest H2 production was in N(CH2CH3)3 (triethylamine) solution, being 1597 μmol·g–1·h–1, which is 2.6 times as high as that using the aqueous solution mixture of Na2S and Na2SO3 as the sacrificial agent. In addition, when the pH was 13, the catalyst concentration was 1.0 g·L–1, and the triethylamine concentration was 1.0 mol·L–1, the photocatalytic activity was the highest. Furthermore, the relationship between triethylamine concentration and H2 production was analyzed according to the theory of dynamics.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2019
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IF 3.973
Zhimin Zhang,Jie Wang,Yongxiu Song,Zengkai Wang,Mingdong Dong,Lei Liu
Alzheimer's disease (AD) is a common neurodegenerative disease characterized by cognitive and memory function impairment. Studies have shown that the overproduction and further misfolding of amyloid polypeptide (Aβ) are the main causes of AD. Therefore, how to reduce Aβ species, especially to disassemble the preformed amyloid aggregates, has become the focus of related research. Photodynamic therapy (PDT) using normal photosensitizers eg. porphyrins, is a traditional way of inhibiting amyloid aggregation or degrading the amyloid aggregates, but UV light irradiation presents a side effect for the damage of normal tissue, which limits its medical application. Upconversion nanoparticles (UCNPs) is a luminous material which can be modified by photodynamic agent to form the complex generating reactive oxygen species (ROS) with noninvasive light irradiation. It presents a good advantage in the disassembly of amyloid aggregates via ROS in noninvasive light irradiation. Herein, we prepared β-NaYF 4 :Yb/Er@SiO 2 @RB by combing UCNPs with photosensitizer to disassemble preformed Aβ aggregates under near-infrared light. The results displayed upconversion nanomaterials could degrade Aβ1–42 fibrils effectively by photo-generating ROS, which demonstrated that the functional UCNPs may have potential applications in the treatment of amyloid diseases in future.
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RSC Advances
·
2019
·Vol. 9
·期 35
·19930-19939
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IF 3.049
Panqi Huang,Jingfei Luan
The effects of Ba-doping on the structure and photocatalytic performance of GaOOH were investigated for the first time in this paper. XRD, SEM, TEM, XPS, UPS, FT-IR, UV-Vis DRS, PL, BET and EPR characterizations were carried out to analyze the properties of Ba-doped GaOOH. The results showed that GaOOH crystallized well with the orthorhombic crystal system with space group Pbnm. The lattice parameters of GaOOH were found to be a = 4.509526 Å, b = 9.771034 Å and c = 2.969284 Å. The transition in the structural morphology of GaOOH before and after Ba-doping was observed in SEM pictures in which the morphology of GaOOH varied from wood-like to rice husk-like. At the same time, the specific surface area of 4 wt% Ba-doped GaOOH (21.5854 m2 g−1) was 3.42 times that of pure GaOOH (6.3047 m2 g−1). Ba-doping caused a red shift of the band gap according to UV-Vis DRS results. The enhanced defect states caused by Ba-doping was confirmed by PL results, which decreased the recombination rate of photogenerated electrons and photogenerated holes. Compared with pure GaOOH, when GaOOH with different Ba content was used as photocatalyst, the removal rate of enrofloxacin was increased by more than 20% only by illumination for 60 min. In addition, Ba-doped GaOOH had excellent stability and could be reused, which could reduce costs and increase the potential of its practical application.
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E-POLYMERS
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2019
·Vol. 19
·期 1
·215-224
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IF 1.491
Meiling Zhou,Jinghua Gong,Jinghong Ma
Hydrogel microfibers with inhomogenous structure can achieve some complex motions such as bending, folding and twisting. So it can be applied to soft actuators, soft robots and micropumps. In this paper, continuous bilayer hydrogel fibers in which one layer is calcium alginate hydrogel and the other is linear poly(N-isopropylacrylamide) (PNIPAM)/calcium alginate/graphene oxide (GO) semi-interpenetrating hydrogel were prepared based on microfluidic spinning method. The results show that the bilayer hydrogel fibers have particular porous internal structures of semi-IPN hydrogels and the pore size becomes smaller with the increase of GO content. Besides, the bilayer hydrogel fibers can bend response to the temperature and near-infrared (NIR) light. The diameter of the hydrogel fibers can be tuned by changing the flow rate of spinning fluid and the take-up velocity of winding device. Graphical
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