Science China-Technological Sciences
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2019
·Vol. 62
·期 7
·1217-1223
·
IF 2.18
Miao Xiao,Han Lu,Wang Lei,Wang Min,Sun XiaoHui,Zhu XiaoTao,Ge Bo
The traditional superhydrophobic materials are not ideal for treating residual pollutants after oil-water separation. In this paper, a simple and economical method was developed for the fabrication of multi-functional superhydrophobic materials PDVB x /TiO 2 composites, through in situ polymerization. The performance of the superhydrophobic composite was studied. The results showed that the low surface energy of PDVB 2.5 /TiO 2 composite with the micro-nano scale roughness would result in excellent superhydrophobicity. In addition, the PDVB 2.5 /TiO 2 composite exhibits optimum effect on the degradation of methyl orange (MO) with the degradation efficiency of 97.8%. What is more, the applications of the composite materials could be expanded to other fields, such as the degradation of drug ciprofloxacin hydrochloride (CIP). Finally, we expanded the application of the PDVB x /TiO 2 composites to tribology, and found its excellent performance in reducing wear and antiwear.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Chen Chunmao,Zhao Danchen,Zhou Qingxiang,Wu Yalin,Zhou Xianqi,Wang Hongyuan
In the present work, polyaniline and CeO 2 co-decorated TiO 2 nanotube arrays (PANI/CeO 2 /TiO 2 NTAs) were facilely prepared by an electrochemical method. The as-prepared materials were characterized by scanning electron microscopy (SEM), an X-ray diffractometer (XRD), and energy-dispersive X-ray spectroscopy (EDS). The photoelectrocatalytic activity of as-prepared materials was investigated with tetrabromobisphenol A (TBBPA) as the target analyte, and the data showed that PANI/CeO 2 /TiO 2 NTAs resulted in much higher photoelectrocatalytic efficiency than that of other materials. Under optimal conditions, the degradation rate of TBBPA reached a maximum value over 96% in 120 min under simulated solar irradiation. The results indicated that CeO 2 and PANI co-modified TiO 2 NTAs could narrow the band gap, expand the response from ultraviolet (UV) to visible region, increase the amount of active free radicals, inhibit the recombination rate of electron-hole pairs, and finally enhance the degradation efficiency towards TBBPA owing to the presence of Ce 3+ /Ce 4+ and PANI. Moreover, the degradation reaction followed the first-order kinetics, and degradation rates of the repeated experiments were all over 92% for ten runs. All these results indicated that this novel catalyst earned great potential as a powerful photoelectrocatalyst for the removal of TBBPA and other pollutants.
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高影响因子
Advanced Composites and Hybrid Materials
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2019
·Vol. 2
·期 2
·242-253
·
IF 0
Ma He,Shi Jun,Zhu Xiaoyi,Zhang Zheng,Li Jingguo,Cao Shaokui
In this study, Au nanorods (AuNRs)/mesoporous silica (SiO 2 )/hydroxyapatite (HAP) nanovehicles with thermally responsive polymeric cap for remotely controlled drug delivery were prepared. The degradability of the hybrid nanovehicles could be greatly enhanced by introducing pH-responsive HAP into mesoporous SiO 2 shell, which would result in the corrosion of HAP from the hybrid matrix in acid media. Thermal-/pH-sensitive poly(N-isopropylacrylamide-co-acrylic acid) (PNA, P(NIPAM-co-AAc)) was employed as the smart polymeric cap to control the drug delivery of hybrid nanoparticles. The in vitro drug delivery results showed that the hybrid nanoparticles displayed excellent drug loading efficiency and distinct near-infrared (NIR)–, thermal-, and pH-responsive drug delivery properties. The results of cell viability also demonstrated that the prepared P(NIPAM-co-AAc)-capped AuNRs/SiO 2 /HAP nanoparticles exhibited the outstanding biocompatibility. The present study provides a facile way to prepare multi-responsive nanovehicles with excellent biocompatibility and degradability by combining intelligent polymer with hybrid inorganic skeleton, which is greatly promising for remotely controllable drug release.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 10
·10136-10147
·
IF 2.914
Yi Yunqiang,Wu Juan,Tu Guoquan,Zhao Dongye,Fang Zhanqiang,Tsang Pokeung Eric
The removal of contaminants by iron-based nanomaterials was inevitably affected by the natural organic matter (NOM), which is one of the most abundant material on earth and exists in natural waters. This study was performed to investigate the main influence of humic acid (HA, representing NOM) on the behavior and reactivity of Ni/Fe nanoparticles in the removal of deca-brominated diphenyl ether (BDE209). Generally, the inhibitory effect of HA on the removal of BDE209 by Ni/Fe showed greater significance with an increase of HA concentration. The zeta potential and sedimentation experiments showed that the HA enhanced the dispersion and stabilization of Ni/Fe particles; however, the removal of BDE209 was found to be inhibited. Moreover, the corrosion capacity of the Ni/Fe nanoparticles showed a positive correlation with the effect of HA on the reactivity of Ni/Fe nanoparticles. Meanwhile, typical quinone compounds in HA had an adverse effect on the removal of BDE209. Additionally, the competitive adsorption experiments and characterization illustrated that the adsorption of HA by Ni/Fe nanoparticles was superior to BDE209. Overall, it was proposed that the corrosion of Ni/Fe was reduced as the contact between the nanoparticles and H 2 O was hindered due to the surface of Ni/Fe was occupied by the adsorbed HA, and thus inhibited the reactivity of Ni/Fe nanoparticles in the removal of BDE209.
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高影响因子
WATER AIR AND SOIL POLLUTION
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2019
·Vol. 230
·期 3
·1-15
·
IF 1.774
Sun Qi,Lu Jian,Wu Jun,Zhu Guangcan
Huge amounts of natural bischofite (MgCl 2 ∙6H 2 O) resulting from the mining process of salt lakes often cannot be utilized effectively and are discarded; techniques for reutilization of the discarded bischofite as magnesium resources are limited. The nano-magnesium hydroxide (nano-Mg(OH) 2 ) synthesized from natural bischofite was firstly used as catalyst for ozonation of antibiotics including sulfathiazole (ST), ofloxacin (OFL), and tetracycline (TC). Rapid ozonation of ST, OFL, and TC was achieved using nano-Mg(OH) 2 as catalyst. The removal rate constant of OFL in the catalytic ozonation treatment (k OFL = 0.512 min −1 ) was nearly 2.1 times higher than the single ozonation (k OFL = 0.249 min −1 ). The removal rate constant of ST and TC increased by 23.5% and 32.8% from 0.298 min −1 and 0.384 min −1 to 0.368 min −1 and 0.510 min −1 , respectively, when the catalyst was added into the reaction system. The removal rate constant of ST sharply increased from 0.259 to 0.604 min −1 when the reaction temperature increased from 15 to 35 °C while those of OFL and TC changes slightly. The removal efficiency sharply decreased when the initial concentration of ST, OFL, and TC increased from 10 to 500 mg L −1 . Both anions and cations could inhibit the removal of ST, OFL, and TC at relatively higher concentrations. The prepared nano-Mg(OH) 2 catalyst could maintain its catalytic activity in the repeated use process. High removal efficiency of typical antibiotics and heavy metals free indicated that nano-Mg(OH) 2 from natural bischofite is a promising ozonation catalyst in terms of antibiotics removal.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Li Yufei,Zhang Huanhuan,Cai Xuan,Zhao Hongli,Magdassi Shlomo,Lan Minbo
Two kinds of carbon-based nanozymes were constructed from the same precursor of zeolitic imidazolate framework-8 (ZIF-8) for O 2 •− determination. Hollow carbon cubic nanomaterial (labelled as HCC) was obtained by chemically etching ZIF-8 with tannic acid and a subsequent calcination. A porous carbon cubic nanomaterial (labelled as PCC) was prepared by directly pyrolysis. Then HCC and PCC were immobilized on the surface of screen printed carbon electrodes (SPCE), fabricating HCC and PCC modified electrodes (denoted as HCC/SPCE and PCC/SPCE). HCC/SPCE, best operated at −0.5 V (vs. Ag/AgCl), has a sensitivity of 6.55 × 10 2 nA μM −1 cm −2 with a detection limit of 207 nM (at S/ N = 3) for O 2 •− sensing. And PCC/SPCE, best operated at −0.4 V (vs. Ag/AgCl), exhibited a superior performance for O 2 •− detection with a sensitivity of 1.14 × 10 3 nA μM −1 cm −2 and a low detection limit of 140 nM (at S/ N = 3). The two sensors possess excellent reproducibility and stability. They were used to sense O 2 •− released from HeLa cells.
Illustration of the synthesis of the hollow carbon cubic nanomaterial (HCC) and of the porous carbon cubic nanomaterial (PCC), and the scheme for detection of superoxide anions in HeLa cell.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 15
·10684-10694
·
IF 3.442
Shen Juanli,Zhou Yiming,Li Shengshi,Gu Pengkun,Xue Guoxin
Fe 3 O 4 magnetic nanoparticles with carboxymethyl cellulose-g-poly(acrylic acid-co-acrylic amide) hydrogel coating (Fe 3 O 4 @hydrogel) were prepared by a coprecipitation method followed by an in situ graft copolymerization. Results of various characterization techniques indicated that hydrogel materials were successfully coated on the Fe 3 O 4 surface with a weight percent of 17.5% and the Fe 3 O 4 @hydrogel has an average size of 10 nm and could be easily collected with the aid of an external magnet. Fe 3 O 4 @hydrogel was used as heterogeneous catalyst to degrade phenol in a Fenton-like reaction. Factors such as initial solution pH, H 2 O 2 concentration and catalyst dosage on the degradation efficiency of phenol were evaluated. Experimental results revealed that about 98.2% phenol and 80.4% chemical oxygen demand (COD) could be removed in 180 min under optimal conditions. Besides, Fe 3 O 4 @hydrogel presented effective phenol degradation at relatively wide pH values ranging from 3.0 to 5.0, and about 50% COD could be eliminated at pH 5.0. The improved catalytic performance of the synthesized catalyst might be ascribed to the pH-sensitive swelling, excellent dispersion, hydrophilicity and permeability of the polymer hydrogel coating. Besides, Fe 3 O 4 @hydrogel showed favorable catalytic stability and reusability with more than 55% of COD removal efficiency after three cycles.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-8
·
IF 5.479
Lin Liping,Xiao Yanling,Wang Yuhan,Zeng Yongnian,Lin Zujin,Chen Xi
Carbon dots doped with nitrogen and copper have been synthesized via a hydrothermal method. They possess favorable peroxidase-like catalytic activity over a wide range of pH values and temperatures. Specifically, they were used to catalyze the oxidation of ortho- and para-phenylenediamine (OPD and PPD) by H 2 O 2 . The resulting products possess different colors (yellow for OPD and brown for PPD), which can be visually discriminated. The corresponding typical absorption peaks of oxidized products for OPD and PPD are at 413 nm and 500 nm, respectively. The method displays excellent discrimination ability and selectivity over potential interferents. The detection limits are 1.1 μM for OPD and 1.9 μM for PPD. The respective linear ranges are from 5 to 200 μM for OPD and from 2.5 to 700 μM for PPD. The method was applied to the quantification of OPD and PPD in spiked natural waters.
Schematic presentation of the synthesis of nitrogen and copper co-doped carbon dots (N,Cu-CDs) and their application as an enzyme mimic for colorimetric discrimination of ortho-, meta- and para-phenylenediamine (OPD, MPD and PPD).
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CELLULOSE
·
2018
·Vol. 26
·期 3
·1825-1839
·
IF 3.809
Lin Fengcai,Lu Xiangchao,Wang Zi,Lu Qilin,Lin Guanfeng,Huang Biao,Lu Beili
Cellulose hydrogels usually have poor mechanical properties which seriously limit their applications in biomedical or industrial fields. Herein, an interpenetrating polymer network strategy was proposed to construct double network hydrogels composed of cellulose and polyacrylamide with high mechanical strength and pH responsive properties. The synergistic interactions and strong hydrogen bonds between two networks contributed to the dissipation of mechanical energy, as evidenced by the compressive stress–strain and rheology analyses. The compressive strength and compressive modulus for cellulose–polyacrylamide interpenetrating network (C–PAM IPN) hydrogels could reach up to 5.62 and 22.47 MPa, which is nearly 18 and 23 times higher than that of cellulose hydrogels. Moreover, these tough C–PAM IPN hydrogels exhibit pH sensitive properties in various pH solutions. Therefore, this paper provides a general strategy to enhance the mechanical and physical properties of cellulose-based hydrogels, which are potentially useful in developing novel cellulose-based hydrogels and expanding their applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 2
·1626-1636
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IF 2.324
Li Yuexuan,Duan Yugang
Silicon coupling reagent is regarded as a common additive on surface treatment of polymer due to its high bonding strength and low cost. In this paper, a series of γ-(2, 3-epoxypropoxy) propyltrimethoxysilane (KH560)-based reduced graphene oxide (RGO)@Fe 3 O 4 (KH560/RGO@Fe 3 O 4 ) composites with different ratio of Fe 3 O 4 nanoparticles (NPs) are synthesized by a facile hydrothermal method. It is confirmed that the silicon reagent KH560, as a hopeful candidate for increasing the RGO lattice defects, is favorable to improve the electromagnetic wave absorption. Meanwhile, the microwave attenuation mechanism of KH560/RGO@Fe 3 O 4 composite suggests that the dielectric loss mainly causes by multiple Debye dipolar relaxation and its magnetic loss comes from the eddy-current effect of Fe 3 O 4 NPs over the high frequency range. In consequence, the KH560/RGO@Fe 3 O 4 composite endows the excellent absorption performance, the reflection loss (RL) value is optimized to − 25 dB at 14.1 GHz with a thickness of 3 mm and the maximum frequency bandwidth for RL < − 10 dB is 4.1 GHz with a thickness of 4 mm.
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Microfluidics and Nanofluidics
·
2018
·Vol. 22
·期 12
·1-13
·
IF 2.384
Lian Zheng,Ren Yong,He Jun,Chen George Z.,Koh Kai Seng
In this paper, pristine and two types of porous polydimethylsiloxane (PDMS) microparticles were fabricated using oil-in-water (O/W) single emulsion template by the needle-based microfluidic multiphase system. By manipulating the flow rate of either the dispersed or continuous phase, microparticles of various sizes were obtained. The capillary number of the continuous phase for all flow conditions applied in this study was less than 0.1, suggesting that the flow regime was dripping. The coefficients of variation (CV) of sizes under different flow conditions were less than 1.5% which indicates the particles to be highly monodispersed. The surface morphology and particle size were characterized by optical microscope and scanning electron microscope. Pristine PDMS microparticles (PDMS-P) and PDMS microparticles templated from tetrachloromethane (CCl 4 ) and white granulated sugars (PDMS-C and PDMS-S, respectively) were prepared under the same flow conditions. Subsequently, the microparticles were adopted for treatment of a synthetic wastewater that contained organic compounds such as toluene under static and dynamic states for comparison. The effects including the releasing amount, size of particles, porosity of microparticles and initial concentration of pollutants were investigated based on the toluene concentration variation, which was quantified by a gas chromatograph-headspace sampler (GC-HS). It has been found that 50 mg of porous PDMS microparticles are capable of realising over 65% of toluene removal efficiency of 200 ppm toluene aqueous solution within 2 h. The microparticles were collected and reused 30 times with unchanged treatment capacity.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 12
·1-8
·
IF 2.127
Dai Xiaohui,Han Zhenwei,Fan Hai,Ai Shiyun
Heteroatom doping can drastically alter electronic characteristics of carbon nitride quantum dots, thus resulting in unusual properties and related applications. Herein, we used sulfur as the doping element and investigated the influence of doping on the electronic distribution of carbon nitride and the corresponding fluorescent property. A simple synthetic strategy was applied to prepare sulfur-doped carbon nitride (S-g-C 3 N 4 ) quantum dots through ultrasonic treatment of bulk S-g-C 3 N 4 . Characterization results demonstrated that the prepared S-g-C 3 N 4 quantum dots with an average size of 2.0 nm were successfully prepared. Fluorescent properties indicated that S-g-C 3 N 4 quantum dots have an emission peak at 460 nm and cover the emission spectra region up to 550 nm. Furthermore, the fluorescent intensity is greatly increased due to the sonication of bulk S-g-C 3 N 4 into quantum dots. As a result, S-g-C 3 N 4 quantum dots not only show a blue cell imaging, but have a bright green color. Therefore, S-g-C 3 N 4 quantum dot is a promising candidate for bioimaging benefiting from the efficient fluorescent property, good biocompatibility, and low toxicity.
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