JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Junzhuo Liu,Huijie Zhang,Liying Yan,Philip G. Kerr,Songhe Zhang,Yonghong Wu
Silver nanoparticles (AgNPs) including a mix of intact nanoparticle-Ag and ‘free’ Ag + pose high risks to benthic photoautotrophs, but the photosynthetic responses of benthic microbial aggregates to AgNPs still remain largely unknown. Here, periphyton and Nostoc were used to elucidate the photosynthetic responses of benthic algae community to intact nanoparticle-Ag and Ag + . During exposure, both intact nanoparticle-Ag and Ag + imposed negative effects on photosynthesis of benthic algae, but via different pathways. Specifically, Ag + had stronger effects on damaging the oxygen-evolving complex (OEC) and thylakoid membrane than intact nanoparticle-Ag. Ag + also suppressed electron transfer from Q A to Q B , and impaired phycobilisome. Intact nanoparticle-Ag inhibited the expression of PsbD and PsbL in PSII, but prompted the ROS scavenging capacity. In response to the stress of AgNPs, the benthic algae increased light energy absorption to maintain the electron transport efficiency, and up-regulated PSI reaction center protein (PsaA) to compensate the degraded PSII. These results reveal how intact nanoparticle-Ag and Ag + influence electron transport, energy conversion and protein expression in the photosynthesis of periphyton, and provide deep insights into the responses of benthic photoautotrophs to different components of AgNPs.
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ACS Central Science
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2020
·
IF 12.685
Shi-Bo Wang,Cheng Zhang,Jing-Jie Ye,Mei-Zhen Zou,Chuan-Jun Liu,Xian-Zheng Zhang
Photothermal therapy (PTT) is an effective treatment modality with high selectivity for tumor suppression. However, the inflammatory responses caused by PTT may lead to adverse reactions including tumor recurrence and therapeutic resistance, which are regarded as major problems for PTT. Here, a near-infrared (NIR) light-responsive nanoreactor (P@DW/BC) is fabricated to simultaneously realize tumor PTT and carbon monoxide (CO)-mediated anti-inflammatory therapy. Defective tungsten oxide (WO3) nanosheets (DW NSs) are decorated with bicarbonate (BC) via ferric ion-mediated coordination and then modified with polyethylene glycol (PEG) on the surface to fabricate PEG@DW/BC or P@DW/BC nanosheets. Upon 808 nm NIR laser irradiation, the DW content in P@DW/BC can serve as not only a photothermal agent to realize photothermal conversion but also a photocatalyst to convert carbon dioxide (CO2) to CO. In particular, the generated heat can also trigger the decomposition of BC to produce CO2 near the NSs, thus enhancing the photocatalytic CO generation. Benefiting from the efficient hyperthermia and CO generation under single NIR laser irradiation, P@DW/BC can realize effective thermal ablation of tumor and simultaneous inhibition of PTT-induced inflammation.
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LIQUID CRYSTALS
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2020
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IF 2.908
Weiwei Tie,Surjya Sarathi Bhattacharyya,Zhi Zheng,Kyung Jun Cho,Tae Hyung Kim,Young Jin Lim,Seung Hee Lee
To develop stable polymer films which had high orientational ordering of carbon nanotube for polarization-dependent light modulator, we present a new concept for electric-field induced alignment of mesogenic carbon nanotubes (m-CNTs) in reactive mesogen host (RMS) fixed by ultraviolet (UV) polymerization. Covalent modification of m-CNTs was performed using structure-tailored mesogenic units [4-(6-hydroxyhexanolxy)-4’-carbonitrile, PCNOH] in esterification reaction based on 100–500 nm long CNTs shortened by acid oxidation cutting, confirmed through 1H NMR, FT-IR, Raman and XPS spectroscopy. Dynamic orientation of m-CNTs in soft m-CNT/RMS composite without aggregates was observed on a large scale by polarized optical microscopy, in which m-CNTs aligns along the electric field direction. It was reasonable the mesogenic segments introduced onto m-CNTs weakened van der walls interactions between the nanotubes by increasing steric repulsion, and then effectively improved the favourable affinity of m-CNTs with RMS molecules. Direct UV-induced polymerization of RMS molecules stabilized the orientational ordering of m-CNTs confirmed by Raman spectroscopy, and the obtained film also exhibited anisotropic light absorption depending on the polarization direction of an incident light. The facile methodology described in this study to generate oriented films of m-CNTs-in-RMS broadened the scope of potential applications of modulator devices and versatile functional composites with anisotropic physical properties.
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Scientific Reports
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2020
·Vol. 10
·期 1
·1-12
·
IF 3.998
Liu Wen,He Tianpei,Wang Yonghong,Ning Ge,Xu Zhenggang,Chen Xiaoyong,Hu Xinjiang,Wu Yaohui,Zhao Yunlin
Norfloxacin (NOF) is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a novel composition named carbon-based composite photocatalytic material of zinc oxide and zinc sulphide (ZnO/ZnS@BC) was successfully obtained by the impregnation-roasting method to remove NOF under UV-light. Scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive spectrometer characterised the composition. ZnO/ZnS was successfully decorated on the surface of biochar (BC). The pH, the ZnSO 4 /PS ratio, and ions and quenchers, were investigated. High removal efficiency was obtained with a pH of 7 and a ZnSO 4 /PS ratio of 1:1, and the removal ratio of NOF reached 95% within three hours; the adsorption and degradation ratios reached 46% and 49%, respectively. Fe 2+ promoted the degradation of NOF, whereas other ions inhibited it, with NO 3 − showing the strongest inhibitory effect. Three reactive species (tert-butanol, quinone, and ammonium oxala) were identified in the catalytic system. The decreasing order of the contribution of each reactive species was: O 2 − > ·OH − > h + . Additionally, a recycling experiment demonstrated the stability of the catalyst; the catalytic degradation ratio of NOF reached 78% after five successive runs. Therefore, ZnO/ZnS@BC possessed strong adsorption capacity and high ultraviolet photocatalysis ability.
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Chemosensors
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2020
·Vol. 8
·期 1
·10
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IF 3.108
Tian-Tian Wang,Kun Guo,Xue-Mei Hu,Jian Liang,Xing-De Li,Zhi-Feng Zhang,Jing Xie
In this work, a label-free colorimetric assay was developed for the determination of urine glucose using smartphone ambient-light sensor (ALS). Using horseradish peroxidase—hydrogen peroxide—3,3′,5,5′-tetramethylbenzidine (HRP-H2O2-TMB) colored system, quantitative H2O2was added to samples to-be-determined for deepest color. The presence of glucose oxidase in urine led to the formation of H2O2and the reduction of TMBred. As a result of this, the color of the urine faded and the solution changed from deep blue to light blue. We measured the illuminance of the transmitted light by a smartphone ambient light sensor, and thereby color changes were used to calculate the content of urine glucose. After method validation, this colorimetric assay was practically applied for the determination of urine samples from diabetic patients. Good linearity was obtained in the range of 0.039–10.000 mg/mL (R2= 0.998), and a limit of detection was 0.005 mg/mL. Our method was had high accuracy, sensitivity, simplicity, rapidity, and visualization, providing a new sensor to be potentially applicable for point-of-care detection of urine glucose.Keywords:urine glucose;smartphone;ambient light sensor;point-of-care detection
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Sustainable Energy & Fuels
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2020
·Vol. 4
·期 4
·1855-1862
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IF 5.503
Jiawei Wang,Chenghe Hua,Xiaoli Dong,Yu Wang,Nan Zheng
In this study, metallic Bi deposited indium vanadate nanosheet (Bi/InVO4) photocatalysts were successfully fabricated by a two-step hydrothermal method. Multiple characterisation techniques were used to investigate the crystal structures, morphologies, and optical and electrical properties of Bi/InVO4. The photocatalytic performance of the as-prepared samples was evaluated via photocatalytic nitrogen fixation under mild conditions. The results show that 5% Bi/InVO4 exhibits the optimal photocatalytic performance, and the generation rate of NH3 is as high as 626 μmol g−1 h−1, which is 5.2 times higher than that of pure InVO4. The enhanced photocatalytic activity is caused by the surface plasmon resonance (SPR) endowed by metallic Bi which enhanced the light-harvesting and the effective separation and migration of charge carriers. Meanwhile, 5% Bi/InVO4 also demonstrates stability in multicycle N2 fixation. This study provides a new research strategy to synthesize high-performance catalysts for photocatalytic nitrogen fixation under mild conditions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xian-Yang Sun,Feng-Jun Zhang,Cui Kong
A novel porous g-C 3 N 4 /WO 3 photocatalyst was successfully obtained by adopting urea and WO 3 ⋅0.33H 2 O as precursor by a simple hydrothermal and calcination method. The structural characteristics, photoelectric properties , and hydrogen generation efficiency of g-C 3 N 4 /WO 3 were studied. The results shows that best photocatalytic hydrogen generation efficiency of the g-C3N 4 /WO 3 was 963 μmol −1 h −1 , it was about 3 times than pure g-C 3 N 4 . Hydrated tungsten oxide promotes the formation of porous structure after removing crystal water, and the increased pore volume and pore size provide more reactive activity sites, which contribute to increase the efficiency of hydrogen generation. The mechanism of photocatalytic hydrogen generation was proposed.
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JOURNAL OF SOLID STATE CHEMISTRY
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2020
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IF 2.726
Danqi Li,Jing Sun,Tingting Shen,Hongchen Song,Jiuxin Liu,Chen Wang,Xikui Wang,Rusong Zhao
In most cases, different morphologies of the same composites correspond to different properties. In this paper, the TiO 2 /rGO heterostructure system with three morphologies was obtained by one-step hydrothermal method through regulating hydrothermal time. Compared with TiO 2 nanoparticle/reduced graphene oxide (TNP/rGO) and TiO 2 nanobelt/reduced graphene oxide (TNB/rGO), TiO 2 nanotube/reduced graphene oxide (TNT/rGO) showed higher photocatalytic activity (78.5%, 2 h) toward degrading Rhodamine B and 2, 4-Dichlorophenol under visible light. The mechanism of enhancing photocatalytic activities of the TiO 2 /rGO system was confirmed by free radicals trapping experiment, ESR , PL and photocurrent measurement. It is revealed that the hole (h + ) is the main reactive specie in TNT/rGO heterojunction and rapid transfer of photogenerated electrons is responsible for enhancing photocatalytic activity. This work not only emphasizes the important role of morphology in improving photocatalytic activity, but also provides a simple strategy to alter the morphology of TiO 2 .
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 4
·1-14
·
IF 2.132
Cao Xinjiang,Guo Weiyun,Li Anhua,Du Juan,Du Lei,Zhang Guangjie,Liu Hui
Developing a high-efficient, low-cost visible-light-responsive photocatalyst is still a challenge in environmental remediation. Here, a three-dimensional (3D) porous architecture named reduced graphene oxide/CdS nanowire (RGO/CdS) aerogel was constructed by a facile two-step approach through coupling graphene with one-dimensional CdS nanowires (CdS NWs). A variety of characterization methods displayed that the resultant RGO/CdS aerogels were embedded with large amounts of CdS NWs with an average length and width of ∼ 2.9 μm and ∼ 60 nm, respectively, which would maximize the specific surface area that in turn markedly facilitate the transportation of photogenerated charge carriers and strong adsorption of organic pollutants. Moreover, the visible-light photocatalytic experiments demonstrated that the RGO/CdS aerogel exhibited a higher degradation rate (96.6%) for methylene blue (MB) degradation compared with that of bare CdS NWs or pure RGO xerogel. In this proposed study, a photocatalytic mechanism indicates that the enhanced photocatalytic activity of the 3D framework might contribute potentially to generate synergetic effect of CdS NWs into the space of graphene sheets.
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CHEMISTRY OF MATERIALS
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2020
·
IF 9.567
Fanghao Ye,Huijun Zhang,Pang Wang,Jinlong Cai,Liang Wang,Dan Liu,Tao Wang
CsPbX3 nanocrystal (NC)-based blue perovskite light-emitting diodes (PeLEDs) are still in a backward position while their green and red counterparts have achieved significant progress in the past few years. The emission spectrum of perovskite NCs can be manipulated via the ratio control of halides in precursor or halogen exchange of NCs. Herein, CsPbBrxCl3–x NCs are synthesized in ambient condition. With tetrabutylammonium p-toluenesulfonate (TBSA) added as the ligand during the purification process of as-synthesized perovskite NCs, bromine in NCs is substituted by chlorine and the spectrum undergoes a blue shift, whereas chlorine is exchanged by bromine in NCs and the spectrum undergoes a red shift by introducing sodium dodecylbenzenesulfonate (SDSA) as the ligand. The origin for halogen exchange can be attributed to the synergistic effects of the anion and cation of benzenesulfonates. The photoluminescence quantum yield (PLQY) of NCs increases from 7% to 81% due to the effective passivating effects of the strong ionic sulfonate heads, and the blue PeLEDs prepared by this method show a promising external quantum efficiency of 2.6%. Our work provides a new approach into spectral tuning of efficient blue PeLEDs.
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RSC Advances
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2020
·Vol. 10
·期 12
·6850-6857
·
IF 3.119
Lingjuan Hu,Qi Wang,Xiaomeng Zhang,Haitao Zhao,Zhe Cui,Peng Fu,Minying Liu,Nan Liu,Shengbao He,Xinchang Pang,Xiaoguang Qiao
A novel raspberry-like γ-Fe2O3@carbon dot (CD) nanocatalyst was prepared and applied for photoinduced electron transfer-reversible addition–fragmentation chain transfer (PET-RAFT) polymerization. The nanocatalyst was found to be an efficient photocatalyst in visible light-regulated PET-RAFT polymerization owing to the oxidative quenching mechanism between the photoexcited γ-Fe2O3@CDs and the RAFT agent in the PET process. Notably, polymerization can be reversibly ceased in the absence of light or under an external magnetic field. The superparamagnetic nature and high saturation magnetization value (∼30.4 emu g−1) of the nanocatalyst contribute to convenient recycling of the nanocatalyst after polymerization. The PET-RAFT polymerization with the nanocatalyst before and after recycling was investigated, which displayed all the characteristics of controlled/living polymerization systems.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Conglu Zhang,Dong Guo,Tianyao Shen,Xiaohong Hou,Meilin Zhu,Sichen Liu,Qi Hu
Developing high-efficient supporter is important for enhancing pollutants removal efficiency of a catalyst. Materials Institute Lavoisier-101(Cr) (MIL-101(Cr)) is one of metal-organic frameworks (MOFs). In this study, a novel visible-light-driven absorptive photocatalyst, TiO 2 -loaded magnetic MOFs composite (TiO 2 /mag-MIL-101(Cr)), was synthesized to improve the reusability, the adsorption and photocatalytic efficiency under visible-light. The as-synthesized TiO 2 /mag-MIL-101(Cr) was systematically characterized and used for adsorbing and photodegrading refractory organics, bisphenol-F (BPF) and acid red 1 (AR1), from water. Mag-MIL-101(Cr) remarkably enhances the light-absorption of TiO 2 , and the band-gap value of TiO 2 /mag-MIL-101(Cr) is 1.61 eV. TiO 2 /mag-MIL-101(Cr) exhibited outstanding removal efficiency to bisphenol-F and AR1, which was attribute to the large adsorption capacity of mag-MIL-101(Cr) and the enhanced separation properties of photogenerated electrons and holes. In the photocatalytic process, h + is proved to be a predominant active species, while ·OH and ·O 2 − play an auxiliary role. The proposed strategy is an attempt to design new semiconductor-MOF photocatalytic materials for degrading organic contaminants in water under visible light.
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