ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 48
·68513-68522
·
IF 4.223
Zhang
Beibei,Tian Ye,Liu Junshen,Gao Xuezhen,Zheng Hui
As an emerging class of nitrogenous disinfection by-products, halonitromethanes have caused public health concerns owing to their high toxicity. More and more attention has been paid to the new materials and technologies for the removal of halonitromethanes. In this study, a novel material, nanoscale zero-valent iron (nZVI) supported on MIL-96 (nZVI@MIL-96) with favorable stability and reusability, was synthesized and applied to the adsorption-degradation of trichloronitromethane (TCNM) in the water. The results revealed that almost all the TCNM could be removed under 20 mg/L nZVI@MIL-96 dosage with a wide temperature range. The optimum mass ratio of nZVI to MIL-96 was 1:2, and the TCNM adsorption-degradation followed a pseudo-first-order model. The coexisting ions, such as SO 4 2– , PO 4 3– , and NO 3 – , with high concentration brought adverse effects on the removal of TCNM; however, the effects of Cl – and CO 3 2– were insignificant. The concentrations of aluminum and iron ions in water were all within the standard value after adsorption with the nZVI@MIL-96. The degradation mechanism of TCNM by nZVI@MIL-96 included two steps, namely, adsorption and degradation, and methylamine was the terminal dechlorination and denitration products. In a word, the as-prepared nZVI@MIL-96 nanoparticles demonstrated the capabilities as a material of adsorption-degradation of TCNM in the water.
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高影响因子
AMB Express
·
2021
·Vol. 11
·期 1
·1-8
·
IF 3.298
Xu Jing,Wang Bo,Zhang Wen-hui,Zhang Fu-Jian,Deng Yong-dong,Wang Yu,Gao Jian-Jie,Tian Yong-Sheng,Peng Ri-He,Yao Quan-Hong
p-Nitrophenol (PNP) is an important environmental pollutant and can causes significant environmental and health risks. Compared with the traditional methods, biodegradation is a useful one to completely remove the harmful pollutants from the environment. Here, an engineered strain was first constructed by introducing PNP biodegradation pathway via the hydroquinone (HQ) pathway into Escherichia coli. In the engineered strain BL-PNP, PNP was completely degraded to β-ketoadipate and subsequently enter the metabolites of multiple anabolic pathways. The high tolerance and rapid degradation ability to PNP enable the engineered strain to have the potential to degrade toxic substances. The engineered strain created in this study can be used as a functional strain for bioremediation of PNP and potential toxic intermediates, and the method of assembling aromatic hydrocarbons metabolic pathway can be used to eradicate nitroaromatic pollutants in the environment.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 10
·1577-1586
·
IF 1.931
Zhong Jun,Wang Bingbing,Sun Kai,Duan Jiang
Hyperbranched polyethylenimines (hPEIs) have diverse biological applications; however, the intrinsic toxicity is a major concern in developing hPEI-based biomaterials. This work reports the synthesis, properties, and an application as a biocompatible hPEI-based material, namely, fluorescent oxidized hPEI polymeric nanoparticles (F-ohPEIs). The synthesis was achieved through oxidation of hPEI with H 2 O 2 and subsequent cross-linking with formaldehyde, imparting to F-ohPEIs’ desired properties such as remarkably reduced positive charge density, hydrolytic degradability, low cytotoxicity, strong fluorescence emission, and stability. Furthermore, as an application, F-ohPEI demonstrated the ability to selectively respond to cupric ion in a wide concentration range of 0.02 ~ 10 μM with a low limit of detection of 0.013 μM. The synthesis strategy along with the F-ohPEI nanoparticles developed in this work is expected to find promising application in fabricating biocompatible hPEI-based biomaterials. Graphical abstract
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 36
·期 2
·289-296
·
IF 0.957
Zheng Hang,Li Jin,Song Weizheng,He Guangyao,Wang Yifeng,Chen Yanjun
A thermal-responsive photonic crystal material was fabricated by forming an inverse opal nanocomposite hydrogel of poly(N-isopropylacrylamide) (IONH PNIPAm ) within the interstitial space of a polystyrene photonic crystal template. In IONH PNIPAm , PNIPAm were physically cross-linked with two kinds of nanoparticles (carbon dots and laponite clays). The integration of carbon dots and laponite clays for physical crosslinking endowed IONH PNIPAm sufficient strength and self-healing property. IONH PNIPAm films can be completely peeled from the substrates to be utilized as an independent photonic crystal material. The structural color and optical diffraction of the IONH PNIPAm exhibits a rapid reversible change in response to external thermal stimuli due to its physical cross-linking feature. Moreover, the IONH PNIPAm shows clear fluorescence due to the introduction of carbon dots, which enables a convenient way for chemical detection (such as the detection of silver ions). This stimuli-responsive photonic crystal materials based on physically cross-linked inverse opal nanocomposite hydrogels with fast response and good mechanical stability are promising for applications in the fields of smart optical detectors, thermal-responsive sensors and chemical detectors.
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Nano Research
·
2021
·Vol. 15
·期 2
·1039-1046
·
IF 8.897
Xu Tong,Liang Jie,Wang Yuanyuan,Li Shaoxiong,Du Zhaobai,Li Tingshuai,Liu Qian,Luo Yonglan,Zhang Fang,Shi Xifeng,Tang Bo,Kong Qingquan,Asiri Abdullah M.,Yang Chun,Ma Dongwei,Sun Xuping
Electrocatalytic N 2 reduction provides an attractive alternative to Haber-Bosch process for artificial NH 3 synthesis. The difficulty of suppressing competing proton reduction, however, largely impedes its practical use. Herein, we design a hydrophobic octadecanethiol-modified Fe 3 P nanoarrays supported on carbon paper (C18@Fe 3 P/CP) to effectively repel water, concentrate N 2 , and enhance N 2 -to-NH 3 conversion. Such catalyst achieves an NH 3 yield of 1.80 × 10 −10 mol·s −1 ·cm −2 and a high Faradaic efficiency of 11.22% in 0.1 M Na 2 SO 4 , outperforming the non-modified Fe 3 P/CP (2.16 × 10 −11 mol·s −1 ·cm −2 , 0.9%) counterpart. Significantly, C18@Fe 3 P/CP renders steady N 2 -fixing activity/selectivity in cycling test and exhibits durability for at least 25 h. First-principles calculations suggest that the surface electronic structure and chemical activity of Fe 3 P can be well tuned by the thiol modification, which facilitates N 2 electroreduction activity and catalytic formation of NH 3 .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 14
·19380-19389
·
IF 2.478
Zhao Yingying,Zhang Jiejing,Fu Wuyou
Organic pollutant is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a unique novel TiO 2 -based dual-sensitized heterojunction photocatalyst (PbS/CdS/TiO 2 ) was successfully obtained by one step hydrothermal method, chemical bath deposition (CBD) method and ionic layer adsorption and reaction (SILAR) method. Scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive spectrometer characterized the composition. PbS/CdS was successfully decorated on the surface of TiO 2 nanosheet array. As a stable catalyst with wide-spectrum (300–800 nm) optical response, excited electron–hole pairs of PbS/CdS/TiO 2 could apply in degrading organic pollutants. Successfully, the degradation efficiency of PbS(5 C)/CdS(30 min)/TiO 2 nanocomposites reached 99.9% under visible light, which was 5 times over pure TiO 2 . This ternary heterostructured materials will be well-promising photocatalysts.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 10
·4051-4066
·
IF 2.914
Chen Rong,Yi Guohui,Wu Songshuai,Meng Chuangang
Well-dispersed Au–Pt alloyed bimetallic nanoparticles are synthesized using chlorogenic acid as the only reducing agent and stabilizer to reduce Au/Pt precursors successively has been presented here. The shapes of Au–Pt bimetallic nanoparticles are controlled by changing the sequence of successive reduction: the spherical shape in the sequence of Pt precursor reduced prior to Au precursor, and the flower shape by reversing the sequence. The sizes of Au–Pt bimetallic nanoparticles can be tuned by changing the molar ratios of the precursors to chlorogenic acid, and the average size of Au–Pt bimetallic nanoparticles decreased or increased with an increase in chlorogenic acid concentration in different sequence of successive reduction. Additionally, the high antioxidant activity of Au–Pt bimetallic nanoparticles was verified by in vitro radical scavenging assays. Our results show that chlorogenic acid is an excellent reducing and capping agent for the controlled synthesis and stabilization of Au–Pt bimetallic nanoparticles, which could be extended to reduce other metal precursors for synthesizing bimetallic and trimetallic nanoparticles. These shape-controlled and size-tunable Au–Pt bimetallic nanoparticles by chlorogenic acid will expand their biomedical applications in future. Graphic abstract
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
·
IF 5.833
Xu Shengrui,Dong Panlong,Qin Ming,Liu Hailin,Long Anying,Chen Changpo,Feng Suling,Wu Hongjing
Core-shell structured Fe 2 O 3 /CeO 2 @MnO 2 microspheres were fabricated and used as solid-phase microextraction coating for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples. XPS spectra demonstrated the generation of abundant surface oxygen on Fe 2 O 3 /CeO 2 @MnO 2 microspheres, which provided binding sites for enhancement of analyte extraction. Under optimized conditions, the proposed method presented good linearity in the concentration range 0.04–100 ng mL −1 , with low limits of detection varying from 0.38 to 3.57 ng L −1 for eight PAHs. Relative standard deviations for a single fiber and five batches of fibers were in the ranges of 4.1–8.2% and 7.1–11.4%, respectively. The proposed method was successfully used for determination of PAHs in real river water samples with recoveries ranging from 87.1 to 115.9%. The proposed method using as-prepared Fe 2 O 3 /CeO 2 @MnO 2 microspheres as SPME coating exhibit significant potential for real sample analysis due to its excellent reproducibility, high sensitivity, and good linearity. Graphical abstract
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Nano Research
·
2021
·Vol. 15
·期 3
·2592-2598
·
IF 8.897
Mao Xue,Zhao Li,Zhang Kun,Wang Yao-Yu,Ding Bin
Ceramic membranes are attractive for thermal management applications due to its lightweight and ultralow thermal conductivity, while it is indispensable to address the long-standing obstacle of its poor mechanical stability and degradation under thermal shock. In this work, a series of the organic polymer template-modulated yttria doped zirconia (YDZ) nanofibrous membranes with lightweight, superior mechanical and thermal stability are developed through a cost-effective, scalable sol-gel electrospinning and subsequent calcination method. The YDZ membranes demonstrate excellent flexibility and foldability, which can be attributed to the tetragonal phase and small crystallite size of the YDZ fibers due to the presence of yttria. Besides, the fibrous size, grain size, mechanical and thermal stability of YDZ nanofibrous membranes could be tailored by varying the species and molecular weight of polymer template. The remarkable performances are obtained through the poly(vinyl pyrrolidone) (PVP) template YDZ nanofibrous membranes, featuring the superior tensile strength up to ∼ 4.82 MPa, excellent flexibility with bending rigidity ∼ 26 mN, robust thermal stability up to 1,200 °C, ultra-low thermal conductivity of 0.008–0.023 W·m −1 ·K −1 (25–1,000 °C), and excellent flame retardancy with tolerance of flame up to 1,000 °C. The remarkable properties can be attributed to the smaller fibrous size, and higher grain size resulting from PVP template. This robust material system is ideal for thermal superinsulation with a wide range of uses from energy saving building applications to spacecraft.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 36
·19899-19914
·
IF 4.22
Lin Jian,Wang Kangqi,Li Jiangen,Yang Dangsha,Zhu Yanyan,Wang Xinlong
The bimetallic metal–organic framework (CoZn-ZIF) particles of flower bulbs, were grown onto short carbon fibers (SCFs) through an in-situ growth method to prepare CoZn-ZIF@ SCFs. The flame retardant intumescent epoxy resin (EP) composites, were fabricated with CoZn-ZIF@SCFs and ammonium polyphosphate (APP). The limiting oxygen index value of 1wt%CoZn-ZIF@SCFs/4wt%APP/EP composite reached 28.9%, and V-0 rating in UL-94 was attained. Meanwhile, the peak of heat release rate and total heat release was reduced 57.6% and 30.4%, compared with pristine epoxy resin. The analysis of pyrolysis gases and residual char, showed that the improvement in flame retardancy and smoke suppression was due to the catalytic carbonization effect of CoZn-ZIF, along with the strengthening action of the residual layer by SCFs, which led to the generation of more residual char and made it more stable. The improvement in mechanical properties of the flame retardant composite, was due to the reinforcement effects of CoZn-ZIF@SCFs, and its action of interfacial adjustment. This research solved the contradiction between the flame retardancy and mechanical properties of epoxy resin, and proposed a new method to prepare flame-retardant epoxy resin with high performance. Graphical abstract
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Journal of Central South University
·
2021
·Vol. 28
·期 5
·1279-1290
·
IF 1.716
Zhang Guang-ji,Tang Fei-ying,Wang Li-qiang,Yang Wen-jie,Liu You-nian
Transition metal sulfides (TMSs)-based materials have been extensively investigated as effective non-noble catalysts for various applications. However, the exploration of TMSs-based catalysts for hydrogenation of nitro compounds is limited. Herein, CoS x /NC catalysts were prepared by solvothermal sulfurization of ZIF-67, followed by high-temperature annealing (300–600 °C) under NH 3 atmosphere. It was found that the structures and compositions of the as-prepared CoS x /NC can be readily tuned by varying the annealing temperature. Particularly, CoS x /NC-500, which possesses higher degree of S defects and larger specific surface areas, can achieve high conversion, selectivity and stability for catalytic reduction of nitro compounds into amines under mild reaction conditions.
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CELLULOSE
·
2021
·Vol. 28
·期 11
·7021-7031
·
IF 5.044
Zhu Longxiang,Feng Zhaoxue,Wang Dafeng,Wu Jiamin,Qiu Jianhui,Zhu Ping
Lignocellulose is an important biomass resource. Its main components cellulose, hemicellulose, and lignin can be used as important energy and chemical raw materials. The special 3-D stereoscopic structure of lignocellulose makes it difficult to separate its components efficiently, limiting large-scale industrial applications. In this work, a novel one-pot and low-temperature phase transition (LTPT) method with no oxidant was applied to efficiently isolate rice straw cellulose microfibers (CMF) from rice straw (RS), with the cellulose content of the CMF reaching 85.4%. The LTPT method can also change the crystal structure of cellulose in RS from cellulose I to cellulose II. Furthermore, experimental results show that CMF can be isolated from RS at a low concentration (3 wt%) of NaOH solution. Graphic abstract In this work, we used the one-pot and low-temperature phase transition method to prepare rice straw cellulose microfibers (CMF) in NaOH solution. The diameter of CMF is about 4.32 μm, and its cellulose content can reach 85%.
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