RSC Advances
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2019
·Vol. 9
·期 38
·21646-21652
·
IF 3.049
Zhiyi He,Yu Wang,Xiaoli Dong,Nan Zheng,Hongchao Ma,Xiufang Zhang
We have designed and manufactured In2S3 nanotubes containing sulfur vacancies as effective and stable photocatalysts for nitrogen fixation and ammonia production. In the preparation process of In2S3, a self-templated strategy was used to obtain the nanotubes. The sulfur vacancies were then manufactured by calcination under a nitrogen atmosphere. The existence of sulfur vacancies enhances the light absorption and promotes the separation and migration of the photoinduced charge carriers. In addition, sulfur vacancies can serve as the active sites to achieve strong N2 adsorption and activation. Thus the obtained samples show enhanced photocatalytic performance with a high NH3 generation rate (52.49 μmol h−1 g−1) and excellent stability under UV-vis light.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiaojie Yang,Xueqin An
An in-situ synthesis method for loading Carbon Dots (CDs) on the surface and the inner cavities (lumens) of akund fibres has been presented. CDs were successfully loaded on the lumens of akund and AgNPs were also synthesized on the inner surface of fibres by using CDs on the surface of akund as reductant. The inner and outer surface morphology of akund-CDs and akund-CDs/AgNPs were obtained by using scanning electron microscope (FESEM). The fluorescence (FL) properties of CDs on the inner surface of akund-CDs and akund-CDs/AgNPs were compared by using confocal laser scanning microscopy (LSCM) and it showed that the FL intensity of CDs on akund-CDs was much stronger than that on akund-CDs/AgNPs. The microstructures of CDs on akund-CDs and akund-CDs/AgNPs were also probed by using time-resolved FL spectra for the first time, and the results showed that the microstructures of CDs on akund-CDs and akund-CDs/AgNPs were different. The FL property, load capacity, stability, antioxidant activity and washability of akund-CDs synthesized by different methods were also measured, and it was found that the in-situ method was much better than the traditional simple soaking method. This work suggested a promising approach to load nanoparticles on the lumens of akund, which endows akund with many functions to be applied in textile industry.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Pan Wang,Ji Qi,Chuang Li,Xiao Chen,Jingjie Luo,Wenping Li,Xiaodong Shi,Lilian Olivet,Tonghua Wang,Changhai Liang
The design of cost-efficient earth-abundant catalysts with superior performance for oxygen evolution reaction (OER) is extremely important for future renewable energy production . The synthesis of high-surface-area catalysts with high intrinsic activity remains challenging. In this work, in-situ surface selective removal method by electrochemical oxidation is used to synthesize nickel (oxy)hydroxide covered Ni 3 Sn 2 supported on carbon nanotubes (Ni 3 Sn 2 @NiO x H y /CNT), which exhibits 10, 100, 200 and 300 mA cm −2 at overpotential of 250, 317, 329 and 335 mV in OER, respectively. In-situ surface selective removal of Sn from the crystal lattices and oxidation of Ni under anodic oxidation provide highly active amorphous NiO x H y with abundant surface defects , leading to the high apparent activity (current density) and intrinsic activity (TOF) of the Ni 3 Sn 2 @NiO x H y /CNT. This work develops a general method to synthesize high-surface-area water oxidation catalysts, which can be used to prepare a series of catalysts for oxygen evolution reaction in the near future.
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ENERGY & FUELS
·
2018
·
IF 3.024
Lifeng Chen,Xiaoming Zhu,Lei Wang,Hui Yang,Daigang Wang,Meilong Fu
Current displacing agents for enhanced oil recovery (EOR), i.e., water, gas, foam, and common nanofluid, suffer plenty of problems in ultralow-permeability reservoirs, with a limited oil recovery. A novel agent, amphiphilic graphene oxide (H–GO), is confirmed to be effective in EOR under such unconventional conditions. We present the fundamental mechanisms for the improved performance by H–GO. Specifically, the effectiveness of H–GO is experimentally verified from multiple perspectives, including emulsifying ability, interfacial activity, and wettability alteration action. Experimental observations show that H–GO has excellent emulsifying ability that the amphiphilic Janus nanosheet is inclined to move onto the oil–water interface. Pickering emulsion formed by H–GO and oil, with an average droplet diameter of only 2.66 μm, is considerably stable, which can be maintained for at least 30 days. Besides, H–GO reduces the oil–water interfacial tension to 0.493 mN/m, 1 order of magnitude lower than that between the common nanoparticle and oil. H–GO shows better wettability alteration efficiency compared to a common nanoparticle. Consistently, micromodel tests show that H–GO gives a promising sweep and displacement efficiency to oil. As a result of these advantages of H–GO, the oil on the rock surface can be separated and form the emulsion or oil zone easily, leading to the incremental recovery of 10.83% using only H–GO (1 mg/mL) in an ultralow-permeability core. The study provides a novel approach for EOR in ultralow-permeability reservoirs. The high performance, convenient operation, and environmental protection make H–GO flooding have great potential for oilfield practice.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Songfeng E,Zezhou Zhu,Liyan Xie,Zhuo Li,Renjie Geng,Taotao Li,Chaowei Li,Weibang Lu,Yagang Yao
In this contribution we report an integrated method to obtain soluble boron nitride nanosheets (BNNSs) by combing ball-mill, chemical vapor deposition (CVD) growth, Lewis acid-base interaction, and ultrasonic exfoliation. This simple and inexpensive method can achieve a high yield of 40% few layer BNNSs. Based on the excellent dispersity in water and dimethylformamide (DMF), we introduced these nanosheets into thermoplastic polyurethane (TPU) to fabricate composite films, which display good uniformity and high thermal conductivity. The high-yield can be attributed to the synergistic effects of the multi-steps processing, while the good dispersity may be derived from the chemical functionalization and the formation of nanohybrids. The present method can promote the practical applications of BNNSs in many fields, especially the polymer-based nanocomposites.
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TALANTA
·
2018
·
IF 4.244
Xiu-Fang Yan,Zeng-Ping Chen,Ying Huang,Chao Kang,Ru-Qin Yu
Probe encapsulated by biologically localized embedding (PEBBLE) has emerged as a new type of sensing technique for complex systems. Generalized ratiometric PEBBLE nanosensors prepared by encapsulating an intensity-based probe and an inert reference dye inside the pores of stable matrix possess advantages of easy synthesis, immunity to interference, lower toxicity, and robustness to variations in probe loading. However, the selection of appropriate reference dyes used in generalized ratiometric PEBBLE nanosensors is a rather difficult task since they should satisfy some stringent requirements. In this contribution, the feasibility of using carbon dots (C-dots) as generic inert references in synthesizing PEBBLE nanosensors was first investigated in detail. And a dual-wavelength monitoring strategy and the quantitative fluorescence model for generalized ratiometric probes (QFM GRP ) were adopted to solve the problems brought by the use of carbon dots as inert references. C-dots doped PEBBLE nanosensors (C-PEBBLE nanosensors) for the quantification of NO 2 − and free Ca 2+ were synthesized by encapsulating C-dots and intensity based fluorescence probes (i.e., acriflavine for NO 2 − , and Rhod-2 for Ca 2+ , respectively) inside the pores of stable matrix. Experimental results showed that the combination of C-PEBBLEs, the QFM GRP model and the dual-wavelength monitoring strategy achieved accurate quantification of NO 2 − and the free Ca 2+ in real-world samples. Their quantitative results were in good consistence with those determined by HPLC and atomic absorption spectrophotometer, respectively. The strategies proposed in this contribution have generic applicability in the synthesis of PEBBLE nanosensors and their quantitative applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Wei Zhu,Li Zhang,Zhe Yang,Pei Liu,Jing Wang,Jinguo Cao,Aiguo Shen,Zushun Xu,Jing Wang
Though imaging guided photodynamic therapy (PDT) has emerged as a promising cancer therapy, how to enhance the PDT efficiency is still a research hotpot due to the tumor hypoxia and insufficient dosage of photosensitizers in the tumor site. Herein, a multifunctional theranostic nanoplatform was rationally constructed by nanoscale metal organic frameworks (NMOFs), bovine serum albumin (BSA), sulfadiazines (SDs), and MnO 2 . Porphyrin as organic ligands involved in the formation of NMOFs, which could allow more photosensitizers in one system. BSA as ideal carrier endows the nanoplatform with low toxicity and long circulation. SDs was introduced to provide actively targeting for the over-expressed carbonic anhydrase IX (CA IX) in tumor cells. More importantly, this nanoplatform can overcome the hypoxic microenvironment via down-regulating CA IX and catalyzing H 2 O 2 to generate O 2 , resulting in significantly enhanced PDT effect, which was demonstrated by the photocytotoxicity against 4T1 cells and the decreased tumor volume. In addition, in vitro/vivo T 1 -weighted MRI results showed that the nanoplatform could be served as positive MRI contrast agent with a higher longitudinal relaxivity value (r 1 ) at 6.09 mM −1 s −1 than that of clinical clinical contrast agent (Gd-DTPA, r 1 = 4.33 mM −1 s −1 ). Such theranostic nanoplatform integrates multifunctional contents into one system and thereby provides a new strategy for targeted tumor therapy.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Gongxi Qiao,Zhi Zeng,Jinwei Gao,Yiping Tang,Qianming Wang
Hybrid organic-inorganic perovskites are a new class of photoluminescent and low-cost nanomaterials . Chemical transformation using less-toxic elements under ambient reaction conditions has emerged as a major issue due to pressures on environment and human health. Herein, the synthesis of copper-incorporated CH 3 NH 3 Pb 1-x Cu x Br 3 based on a ligand-assisted reprecipitation (LARP) technique has been reported. The achieved quantum dots have an average size of 8 nm and the existence of copper has been verified by morphological studies. The nanoscale particles exhibited strong blue luminescence upon the excitation at 370 nm. The replacement by Cu 2+ resulted in emission evolution from 468 to 513 nm and the photophysical properties were discussed. This study will open a new approach to control the fluorescence of perovskite-type quantum dots, which will extend its application in different areas.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Chuang-Chao Sun,Ming-Yong Zhou,Na-Chuan Wang,Xue Yin,Jia-Jia Yuan,You-Zhi Song,Li-Ping Zhu,Bao-Ku Zhu
Membranes with tunable charge characteristics and suitable nanopores are highly desired for their enormous potentials in specific membrane separation process. Herein, we present an effective approach to achieve this by using PVC-based grafting amphiphilic charged polymers (GACPs) as membrane additives. Non-solvent induced phase separation (NIPS) combined with a non-solvent annealing (NA) method is carried out to fabricate membranes with suitable nanopores. Employing scanning electron microscopy image analysis and PEG rejection tests on the prepared membranes, we observe pronounced shrinkage of pore size from around 10 to 3 nm caused by the NA process. In addition, the results of the zeta potentials and pore size distribution suggest the successful fabrication of membranes with tunable charge characteristics and large nanopores. Furthermore, the significant increase of Na 2 SO 4 rejection from 20% to 80% demonstrates the effectiveness of this approach, which may have giant application potentials in loose nanofiltration (NF).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Mao-ping Wei,Hui Chai,Ya-li Cao,Dian-zeng Jia
One of the major challenges encountered in some conventional nano-structured adsorbents such as graphene oxide (GO) and graphene is the structural limits including serious aggregation and hydrophilic surface in water. And the sulfanilic acid functionalized graphene oxide (SGO) can powerfully attract positively charged pollutants. Therefore, the SGO served as an adsorbent to remove dyes and toxic metal ions from aqueous solution were intensively investigated. At the same time the reduced sulfonated graphene oxide (rSGO), reduced graphene oxide (rGO), and graphene oxide (GO) were performed as the comparative samples. The results showed that the maximum adsorption capacities of SGO were 2530 mg/g for methylene blue and 415 mg/g for Pb 2+ , which was much higher than that of the contrast samples and adsorbents reported in literatures. The adsorption of SGO was investigated systematically including the saturated adsorption capacities, isotherm, and kinetic adsorption process. The SGO displayed high adsorption efficiency and superior adsorption capacity toward metal ions and dyes, which is mainly attribute to the good dispersibility and the multiple adsorption sites of SGO. These results are promising not only providing effective adsorbing heavy metal ions and organic dyes, but also gaining insights into adsorption mechanism of graphene materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Wenshu Yang,Jinhui Hao,Zhe Zhang,Bailin Zhang
Starting with metal–organic frameworks (MOFs), a facile process was demonstrated toward the synthesis of porous FeP nanocubes. Herein, Prussian blue nanocubes were used as iron-based MOFs precursors, and converted into FeP nanocubes through the thermal phosphidation reaction. Then, the FeP nanocubes were exploited as a peroxidase mimetic, which not only has the advantages of low cost, high stability, and easy preparation, but also follows Michaelis–Menten behaviors and shows strong affinity to substrates. On the basis of high catalytic activity of FeP nanocubes, a rapid, and convenient approach was developed for the colorimetric detection of H 2 O 2 from 2 μM to 130 μM and with a detection limit of 0.62 μM. The good catalytic activity and high stability make the porous FeP nanocubes a useful catalyst for a wide range of potential applications in catalysis and biotechnology.
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高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 3
·439-444
·
IF 2.138
Jinying Sun,Yang Liu,Simin Lv,Zhirong Huang,Liao Cui,Tie Wu
In this paper, bisphenol A was determined by electrochemical method at a nitrogen-doped carbon nanofiber modified carbon paste electrode (NCNF/CPE) with high sensitivity and good selectivity. NCNF was obtained by a simple electrospinning followed by carbonization procedure, in which polyacrylonitrile (PAN) as precursor and nitrogen doping was realized by re-utilizing the tail gas that produced in the thermal pretreatment process. Good reproducibility and high stability were obtained for BPA detection at NCNF modified CPE. Current response plotted with BPA concentration was linear in the range of 0.1–60 μM with LOD of 0.05 μM. The proposed electrochemical sensor was employed for BPA determination with satisfactory recoveries for real water samples, indicating the practical applicability of NCNF/CPE.
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