ANALYTICAL LETTERS
·
2022
·
IF 2.267
Yimei Zeng,Changliang Ke,Qi Liu,Ke Huang
Organophosphate esters (OPEs) are commonly used in commercial products as flame retardants. In the present study, a simple method was established for the simultaneous determination of 10 OPEs in aquacultural water and sediments. The targets were extracted using dichloromethane or ethyl acetate, cleaned up by solid-phase extraction, and determined by gas chromatography – tandem mass spectrometry. The matrix effects were lower than 20% for all OPEs except for tris(2-chloroethyl) phosphate in sediments (matrix effect: 29.4%). In spiked water samples, the recoveries of the OPEs were from 72.3% to 108% with relative standard deviations ≤10.2% and the limits of detection from 0.17 to 1.13 ng·L−1. In spiked sediments, the recoveries of the OPEs were from 101% to 121% with relative standard deviations ≤11.2% with limits of detection from 0.02 to 0.32 ng·g−1, dry weight (dw). The developed method was applied to the analysis of aquaculture samples from Kaozhouyang Bay, China. The total concentration ranges of the 10 OPEs in the water and sediments were from 121 to 159 ng·L−1 and 7.54 to 13.3 ng·g−1, dw, respectively.
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PROGRESS IN ORGANIC COATINGS
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2021
·
IF 5.161
Pengfei Shan,Daai Li,Peihan Cai,Kai Zheng,Haiwei Liu,Yingwen Lu,Zhongyu Li,Zhihui Li
In this work, we developed a facile method for direct fabrication of cross-linking polymer coating from monomers via triethylamine gas-mediated thiol-ene chemistry. Combined with fluidized bed coating technology , we used this method to prepare a kind of biobased polymer coated slow-release fertilizer. The polymer coating was synthesized from low-cost, biodegradable, and renewable castor oil. The nitrogen-release behavior, the promotion on seed germination and early-stage seedling growth of polymer-coated urea granules were investigated. The coating method demonstrated in this research could provide a new perspective for the development of a new generation of biobased slow-release fertilizer.
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Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 22
·11980-11989
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IF 12.732
Zhuo Liu,He Lv,Ying Xie,Jue Wang,Jiahui Fan,Baihe Sun,Lin Jiang,Yang Zhang,Ruihong Wang,Keying Shi
Very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing applications, which provides new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure of the Ti3C2Tx@TiO2@MoS2 composite was well designed via a facile one-step hydrothermal route, in which TiO2 nanosheets are in situ grown on ultrathin and highly conductive Ti3C2Tx MXene. Simultaneously, the few-layer and vertically oriented MoS2 nanoflakes rich in active edge-sites were uniformly distributed in the composite. Ti3C2Tx MXene and MoS2 act respectively as the electron reservoir and main sensitive material. The strong interfacial contact in different components facilitated the transfer of charge carriers and their spatial separation. Integrating the unique structural and electronic properties, the as-prepared Ti3C2Tx@TiO2@MoS2 sensor exhibited a remarkable gas sensing performance at room temperature (Ra/Rg = 55.16, 50 ppm NO2), which is 7.3, 3.8 and 2.1 times higher than that of pristine MoS2, TiO2@MoS2 and Ti3C2Tx@MoS2 composites, respectively. It also achieved ultrafast response time (1.8 s), more than 90% recoverability, low detection limit (23 ppb), dedicated selectivity and as long as eight-week stability.
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高影响因子
FUEL
·
2021
·
IF 6.609
Shenglong Wang,Jian Xu,Shuanshi Fan,Yanhong Wang,Xuemei Lang,Chi Yu
Clathrate hydrates is an ideal host for natural gas, by entrapping CH 4 molecules in cage-like structures composed of hydrogen-bonded water molecules, natural gas can be stored in solid form with high density. However, the suppression of hydrate dissociation under moderate thermodynamic conditions is still challenging. In this study, to increase the preservation stability of CH 4 hydrate at atmospheric pressure, a new surface-treatment method was proposed by coating CH 4 hydrate with CP-CH 4 hydrate. CH 4 hydrate pellets formed from ice powder or 0.03 wt% Sodium dodecyl sulfate (SDS) solution were mechanically pressurized with CP to form hydrate pellets. The presence of CP-CH 4 hydrate layer on the sample surface was confirmed by Raman spectroscopy, and the hydrate pellet was successfully preserved under superheated conditions, i.e., 0.1 MPa − 0.3 MPa, 279 K − 284 K with a storage volume density up to ~146 V CH4 (STP)/ V water , and the accumulated CH 4 loss was less than 0.3 mol% for hydrate pellet formed from ice powder, and 3 mol% for hydrate pellets formed from SDS solution for at least 8 h.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Yujie Chen,Zihao Jia,Muhammad Shafiq,Xianrui Xie,Xianghao Xiao,Rita Castro,João Rodrigues,Jinglei Wu,Guangdong Zhou,Xiumei Mo
Electrospun nanofibers emulate extracellular matrix (ECM) morphology and architecture; however, small pore size and tightly-packed fibers impede their translation in tissue engineering. Here we exploited in situ gas foaming to afford three-dimensional (3D) poly(L-lactide-co-ε-caprolactone)/silk fibroin (PLCL/SF) scaffolds, which exhibited nanotopographic cues and a multilayered structure. The addition of SF improved the hydrophilicity and biocompatibility of 3D PLCL scaffolds. Three-dimensional scaffolds exhibited larger pore size (38.75 ± 9.78 μm 2 ) and high porosity (87.1% ± 1.5%) than that of their 2D counterparts. 3D scaffolds also improved the deposition of ECM components and neo-vessel regeneration as well as exhibited more numbers of CD163 + /CCR7 + cells after 2 weeks implantation in a subcutaneous model. Collectively, 3D PLCL/SF scaffolds have broad implications for regenerative medicine and tissue engineering applications.
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PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Kai-Qiang He,Chun-Gang Yuan,Yang-Hong Jiang,Yan Li,Xue-Lei Duan,Qi Guo
Some sorbents have been developed for arsenic (As) compounds capture from flue gas . However, most of the conventional sorbents have cost constraints and can cause secondary pollution due to the leaching of arsenic after use. To solve this problem, a new and highly efficient adsorbent for gaseous arsenic was successfully developed in this paper with excellent immobilization performance and low-cost. A series of Mn-supported attapulgite (ATP) composites were fabricated, characterized, and investigated for arsenic capture. The modification of ATP with Mn not only considerably enhanced the adsorption efficiency but also stabilized the adsorbed As in the spent sorbents. SO 2 in flue gas promoted the adsorption performance through As-sulfate binding, whereas NO was beneficial for the oxidation of As(III) to As(V) on the surface of Mn-modified ATP. The incorporation of Mn with ATP generated abundant hydroxylate (OH − ) from hydration and accelerated the formation of As-sulfate compounds, which was beneficial for physical encapsulation. The results of the toxicity characteristic leaching procedure and sequential extraction test revealed that adsorbed As could be considerably immobilized by the sorbent with low leaching ability. Mn modification changed more As into inert fractions and consequently inhibited release from spent sorbents, which considerably reduced the risks of secondary pollution. The developed composite can be potentially used as a new efficient sorbent for gaseous arsenic capture in flue gas.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Pengfei Cheng,Fan Dang,Yinglin Wang,Jianning Gao,Luping Xu,Chen Wang,Li Lv,Xu Li,Bao Zhang,Baijun Liu
In this work, hierarchical flower-like Ni-doped Co 3 O 4 was synthesized via a facile one-step coprecipitation method. In the synthesis process, a series of solvent-dependent experiments were carried out to investigate the effect of ethanol/water ratio (R-E/W) on samples. With the increasing ethanol/water ratio, the doping concentration of Ni 2+ increased and the microstructure evolved from micro-leaves to micro-flowers. Additionally, gas sensors based on prepared materials were fabricated to evaluate their gas sensing properties. The comparative analysis illustrated that the sensor based on 5.3 mol% Ni-doped Co 3 O 4 microflowers (R-E/W = 3/30) presented the highest response (8.34) to 100 ppm n-butanol at low optimum temperature (165 °C), with a response/recovery time of 59/63 s, and it also exhibited excellent anti-humidity properties and long-term stability. The unique hierarchical flower-like microstructure and the optimized parameters (catalytic sites, carrier concentration, ratio of Co 2+ , oxygen component) caused by the doping of Ni were responsible for the improved gas sensing performance. Therefore, this work presented a simple solvent-dependent route to controllably synthesize Ni-doped Co 3 O 4 sensing material, and the excellent gas sensing properties of the sensor based on 5.3 mol% Ni-doped Co 3 O 4 microflowers revealed a great application prospect in detecting n-butanol.
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CHEMOSPHERE
·
2020
·
IF 5.778
Kang Li,Bairen Yang,Liping Wang
The aim of this study was to evaluate the influence of rhamnolipid (RL) and ferric ions on the performance of a biotrickling filter (BTF) for the removal of gas-phase 1,2-dichlorobenzene ( o -DCB). A comprehensive investigation of microbial growth, pollutant solubility, extracellular polymeric substances (EPS) and enzymatic activity in o -DCB degradation by an isolated strain Bacillus cereus DL-1 with/without RL and Fe 3+ were carried out using batch microcosm experiments. In addition, o -DCB removal performance, biofilm morphology, and microbial community structures in two identical lab-scale biotrickling filters (named BTF1 and BTF2) inoculated with strain DL-1 were studied. The batch microcosm experiments demonstrated that 120 mg L −1 RL and 4 mg L −1 Fe 3+ could enhance the biodegradation of o -DCB, which may be due to promotion on bacterial growth, o -DCB solubilization , C 12 O enzyme activity , and polysaccharide (PS) and protein (PN) in EPS. Fourier transform infrared (FTIR) spectra indicated that the addition of RL with Fe 3+ had notable effects on the functional groups of PS and PN in EPS. The experimental results in BTFs indicate that the removal efficiency of o -DCB decreased from 100% to 56.4% for BTF1, which was not fed with RL and Fe 3+ , and from 100% to 80.3% for BTF2, which was fed with RL and Fe 3+ , when the inlet loading rate increased from 4.88 to 102 g m −3 h −1 at an empty bed residence time of 60 s. In addition, the microbial adhesive strength and the microbial community structure were different among both BTFs, highlighting the positive effects of RL and Fe 3+ .
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 37
·19293-19307
·
IF 6.895
Fangmei Zhang,Shikai Liu,Na Zhang,Ye Kuang,Wenting Li,Shili Gai,Fei He,Arif Gulzar,Piaoping Yang
Hypoxia in tumor cells is regarded as the most crucial cause of clinical drug resistance and radio-resistance; thus, relieving hypoxia of tumor cells is the key to enhancing the efficacy of anticancer therapy. As a gas signal molecule of vasodilatation factors, nitric oxide (NO) can relieve the hypoxia status of tumor cells, thereby, enhancing the sensitivity of tumor cells to radiotherapy. However, considering complications of vascular activity, the level of NO required for radiotherapy sensitization cannot be obtained in vivo. In view of this, we design and fabricate a multifunctional bismuth-based nanotheranostic agent, which is functionalized with S-nitrosothiol and termed Bi–SNO NPs. X-rays break down the S–N bond and simultaneously trigger large amount of NO-releasing (over 60 μM). Moreover, the as-prepared Bi–SNO NPs not only possess the capability of absorbing and converting 808 nm NIR photons into heat for photothermal therapy, but also have the ability to increase X-ray absorption and CT imaging sensitivity. In addition, the collaborative radio-, photothermal-, and gas-therapy of Bi–SNO in vivo was further investigated and remarkable synergistic tumor inhibition was realized. Finally, no obvious toxicity of Bi–SNO NPs was observed in the treated mice within 14 days. Therefore, the Bi–SNO developed in this work is an effective nano-agent for cancer theranostics with well-controlled morphology and uniform size (36 nm), which could serve as a versatile CT imaging-guided combined radio-, photothermal- and gas-therapy nanocomposite with negligible side effects.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Ran Wang,Xiaoya Yan,Bingcheng Ge,Jingxin Zhou,Mingli Wang,Lexin Zhang,Tifeng Jiao
The research studies on the functionalization of two-dimensional (2D) materials (such as black phosphorus) are essential for the development of self-assembled nanomaterials. In this work, the composite films based on black phosphorus (BP) and dyes were prepared by Langmuir–Blodgett (LB) technology. In order to make better use of the characteristics of BP, it was exfoliated to form BP nanosheets (BPNS) and then modified with polyethyleneimine (PEI) to maintain stability. UV–vis, Raman, atomic force microscopy, and other characterizations prove that the composite films are successfully synthesized, which may be attributed to electrostatic forces and π–π stacking forces. Interestingly, the obtained BPNS-PEI-TPPS composite LB film shows good sensitivity to acid and alkali gas. In addition, the results of surface-enhanced Raman scattering (SERS) indicated that the BPNS-PEI-TsNiPc composite film had surface-enhanced performance for crystal violet molecules. The current work provides new clues for the preparation and development of BP-based self-assembled film materials for gas sensors and SERS.
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高影响因子
Foods
·
2020
·Vol. 9
·期 4
·505
·
IF 4.092
Qi Zhou,Guijie Li,Zhu Ou-Yang,Xin Yi,Linhua Huang,Hua Wang
An efficient and practical method for identifying mandarin juice over-blended into not from concentrate (NFC) orange juice was established. Juices were extracted from different cultivars of sweet orange and mandarin fruits. After being pasteurized, the volatile organic compounds (VOCs) in the juice samples were extracted using headspace solid-phase microextraction, and qualitatively and quantitatively analyzed using gas chromatography–mass spectrometry detection. Thirty-two VOCs contained in both the sweet orange juice and mandarin juice were used as variables, and the identification model for discriminating between the two varieties of juice was established by principal component analysis. Validation was applied by using common mandarin juices from Ponkan, Satsuma and Nanfengmiju cultivars blended at series of proportions into orange juices from Long-leaf, Olinda, and Hamlin cultivars. The model can visually identify a blending of mandarin juice at the volume fraction of 10% or above.Keywords:mandarin juice;not from concentrate (NFC);principal component analysis (PCA);headspace solid-phase microextraction (HS-SPME)
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高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Yanxia Zhu,Jun Cheng,Ze Zhang,Jianzhong Liu
In order to promote phenol tolerance and the carbon fixation rate of cells during CO 2 sequestration in coal chemical flue gas, γ-ray irradiation from cobalt-60 ( 60 Co) was used to mutate Arthrospira platensis to generate efficient strains. A phenol-tolerant strain Mutant 11k was obtained with 11,000 Gy of gamma irradiation. The phenol degradation efficiency of the mutant was 34.7 % higher than that of wild strain, attributing to the increased activity of phenol hydroxylase that catalyzed phenol to generate catechol. The catechol 1,2-dioxygenase activity in mutant cells was enhanced by 39.5 % while catechol 2,3-dioxygenase was weakened by 23.8 %, revealing that the β-ketoadipate pathway plays a more important role than 2-hydroxymuconic semialdehyde pathway in phenol degradation. The activity of superoxide dismutase and catalase increased by 6.1 % and 39.8 %, respectively, reducing peroxide damage and maintaining rapid cell growth. The contents of chlorophyll-a and maximum quantum yield of photosystem II in mutant cells were higher than those in wild strain. The biomass yield and carbon fixation rate of mutant were 20.8 % and 22.4 % higher, respectively, than those of the wild strain.
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危险品化学品经营许可证（带存储）