BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Kaikai Gao,Hanxing Wang,Yu Chen,Jie Chu,Junhua Zhang
Currently, the production of xylo -oligosaccharides (XOS) from lignocelluloses by chelating system hydrolysis has not been investigated. Herein, iron (III) chloride/sodium citrate (IC/SC) chelating system hydrolysis and xylanase hydrolysis were used to produce XOS from poplar. Then, the delignification of IC/SC-hydrolyzed poplar was performed by p -toluenesulfonic acid ( p -TsOH) pretreatment to increase the accessibility of cellulase. The results demonstrated that 42.3% of XOS with an extremely low by-product (xylose/XOS = 0.11) was produced from poplar by 50 mM IC/SC hydrolysis (molar ratio of 1:1, 170 °C, 60 min) and xylanase hydrolysis. The second step IC/SC hydrolysis and xylanase hydrolysis of poplar increased the yield of XOS to 51.3%. Finally, the glucose yield of p -TsOH-pretreated poplar (60% p -TsOH, 70 °C, 30 min) was greatly increased from 37.5% to 83.8% by cellulase hydrolysis with Tween 80 addition. The novel strategy proposed in this work was feasible for XOS and monosaccharides production from poplar.
研究领域:
生物化学
·
生物质能工程
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 23
·34861-34873
·
IF 5.19
Humayun Muhammad,Shu Lang,Pi Wenbo,Xia Hui,Khan Abbas,Zheng Zhiping,Fu Qiuyun,Tian Yahui,Luo Wei
The design of highly efficient photoca talysts for clean energy production and environmental remediation are the grand challenges of scientific research. Herein, TiO 2 @MIL53Fe and CeO 2 @MIL53Fe composite photocatalysts are synthesized via solvothermal technique. The SEM and TEM micrographs reveal that TiO 2 and CeO 2 nanoparticles are vertically grown onto the surface of MIL53Fe MOF. Further, HRTEM micrograph confirmed the formation of heterojunction. It has been investigated that the resultant TiO 2 @MIL53Fe and CeO 2 @MIL53Fe photocatalysts exhibit remarkably improved visible light activities for H 2 production and 2,4-dichlorophenol (2,4-DCP) degradation in comparison to the bare MIL53Fe photocatalyst. The enhanced photoactivities of the fabricated TiO 2 @MIL53Fe and CeO 2 @MIL53Fe photocatalysts are attributed to significantly promoted charge separation as confirmed via the surface photo voltage (SPV) and photoluminescence (PL) results. Further, the photocatalysts exhibit high stability and reusability as confirmed via the recyclable tests. This work will promote the design of MOF-based efficient photocatalysts for clean energy production and environment purification.
研究领域:
材料科学
·
环境科学
·
能源科学
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DOI
PubMed
高影响因子
Nanoscience and Nanotechnology Letters
·
2019
·Vol. 11
·期 3
·354-360
·
IF 0
Weng Shizhuang,Qiu Mengqing,Dong Ronglu,Wang Fang,Zhang Dongyan,Zhao Jinling,Huang Linsheng
A sensitive method for detection of chlormequat chloride on cherry tomato peel was developed using surface-enhanced Raman spectroscopy (SERS) coupled with chemometric methods on a portable Raman spectrometer. Firstly, the spectra of ethanol solutions containing 10, 5, 2.5, 1, 0.5 or
0.25 mg/L of chlormequat chloride were collected, and characteristic signals can be detected when concentration was higher than or equal to 0.25 mg/L. Then, quantitative determination was conducted by the regression models developed using partial least-squares regression (PLSR), PLSR with
competitive adaptive reweighted sampling, PLSR with random frog, and random forest with the spectra of 600–1800 cm–1 and characteristic range, and root mean square error of cross-validation of the most remarkable model was 0.0503 mg/L. As for the spiked cherry tomato
samples with 0.5 mg/L to 10 mg/L chlormequat chloride, the predicted recovery rate obtained with the optimal model was in the range of 93.2% to 99.3%, and standard deviation ranged from 0.032 mg/L to 0.878 mg/L.
研究领域:
食品安全检测
·
分析化学
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xuancheng Wang,Xuezhang Xiao,Jiaguang Zheng,Xu Huang,Man Chen,Lixin Chen
The solvent-free amorphous Mg(BH 4 ) 2 composite was in-situ synthesized by ball milling LiBH 4 and MgCl 2 . It is found that the onset dehydrogenation temperature of the as-synthesized composite is 126.9 °C, which is roughly 156 °C lower than that of pristine Mg(BH 4 ) 2 . The activation energy of the amorphous Mg(BH 4 ) 2 and pristine Mg(BH 4 ) 2 for the first dehydrogenation step was calculated as 120.01 kJ/mol and 487.99 kJ/mol, respectively. Hence the kinetics improvement is certified by the lower E a value of the dehydrogenation process. When adding NbF 5 into the composite, the catalyzed composite exhibits better hydrogen storage properties compared to pristine and amorphous Mg(BH 4 ) 2 . The catalyzed composite starts to release hydrogen at proximately 120 °C with a total capacity of 10.04 wt%. The reversibility of the catalyzed composite is also improved. The capacity of the catalyzed composite at the second cycle is 5.5 wt%. For the third and fourth cycles the catalyzed composite can still liberate 4 wt% H 2 . Besides, the onset hydrogen desorption temperature during four cycles are extremely lower than those of pristine and amorphous Mg(BH 4 ) 2 . The peaks of the intermediate MgB 12 H 12 is detected by FTIR as the regenerated hydrogenation product in the catalyzed composite. It can be speculated from the detailed analysis that there are mainly three reasons for the improved properties. Firstly, the additive NbF 5 is favorable to enhance the hydrogen storage properties by modifying the dehydrogenation path and producing MgF 2 and NbB 2 as new products. Secondly, the in-situ formation of amorphous Mg(BH 4 ) 2 is likely to improve the dehydrogenation properties of the samples due to its different reactivity comparing to crystal ones. Finally, LiCl can serve as buffer in the composite and thus improve the dehydrogenation properties.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 18
·185101
·
IF 3.551
Zekun Wang,Xiaoqian Zhai,Yu Sun,Chenyang Yin,Endong Yang,Weiyun Wang,Dongdong Sun
Diseases caused by pathogenic bacilli pose an increasing threat to human health. A common feature of these bacteria is a complete cell wall; therefore, drugs that can penetrate this protective barrier could be used as a novel approach for treating these infections. Here we present a simple method for synthesizing a silica mesoporous material loaded with cadmium selenide (CdSe) and chlorogenic acid. Using UV–visible, fluorescence, and infrared imaging in combination with transmission electron microscopy, it was shown that CdSe and chlorogenic acid could be successfully embedded in the mesopores of silica nanoparticles (CSC NPs), and these NPs presented with a strong fluorescence, uniform size, and good dispersion. Additionally, the results of these analyses indicated that the fluorescence of the CSC NPs was localized within the cells of Escherichia coli and Bacillus subtilis, signifying that these NPs could breach the cell wall and enter the cells of these two bacilli. Additional assessments found that these CSC NPs inhibited the proliferation of the bacteria by disrupting the cell wall, and this was most likely due to the overproduction of reactive oxygen species induced by chlorogenic acid. Importantly, histopathology analysis indicated that the CSC NPs had limited side effects and high biocompatibility.
研究领域:
纳米医学
·
微生物学
·
药理学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Jing Kang,Jinsong Han,Yangyang Gao,Tianyi Gao,Shi Lan,Linghan Xiao,Yanling Zhang,Ge Gao,Harnoode Chokto,Alideertu Dong
Preventing bacterial infections is a main focus of medical care. Antibacterial agents with broad and excellent disinfection capability against pathogenic bacteria are in fact urgently required. Herein, a novel strategy for the development of N-halamine polymers from spheres to fibers using a combined copolymerization-electrospinning-chlorination technique was reported, allowing fight against bacterial pathogen. Optimizing the process conditions, e.g., comonomer molar ratio, concentration of electrospinning solution, chlorination order, and chlorination period, resulted in the formation of N-halamine fibers with controllable morphology. N-Halamine polymers were tested against two common bacterial pathogens, Escherichia coli and Staphylococcus aureus, and were found to be extremely potent against both bacteria, suggesting that they possess powerful sterilizing properties. Remarkably, compared with those with sphere morphology, N-halamine fibers show unexpected enhancement toward both pathogens possibly because of their shape (fiber morphology), surface state (rough surfaces), and surface charge (positive zeta potentials). It is believed that this approach has great potential to be utilized in various fields where antifouling and antibacterial properties are highly required.
研究领域:
材料科学
·
微生物学
·
医学工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Hanping Mao,Yuting Yan,Nan Hao,Qian Liu,Jing Qian,Saibo Chen,Kun Wang
Photoelectrochemical (PEC) detection is an attractive analytical tool as it allows for an elegant and sensitive assay. However, designing a novel detection strategy to achieve an excellent PEC analytical performance is still highly challenging. Herein we design a novel photoelectrochemical (PEC) chlorpyrifos biosensor based on dual signal amplification strategy coupling dual inhibition effect. Dual signal amplification strategy was achieved by coupling the graphene quantum dots sensitized CuFe 2 O 4 magnetic nanocrystal clusters (GQDs–CuFe 2 O 4 MNCs) with the amplification of enzymolysis products. In this biosensing architecture, the GQDs–CuFe 2 O 4 MNCs prepared by electrostatic adsorption showed nearly 4-fold and 30-fold enhancement photocurrent compared with the pure CuFe 2 O 4 MNCs and GQDs, respectively. And the contact angle measurement demonstrated that the GQDs–CuFe 2 O 4 MNCs exhibited good biocompatibility . Based on all these above advantages, the GQDs–CuFe 2 O 4 MNCs were immobilized on the magnetic electrode surface by a fast and simple magnetism-assisted assembly, and the acetylcholinesterase (AChE) was further coated on the surface of the as-prepared multifunctional electrode. Due to thiocholine (enzymolysis products) acts as a sacrificial electron donor to scavenge the holes, compared with the GQDs–CuFe 2 O 4 MNCs modified electrode in the acetylthiocholine chloride solution, the photocurrent of the resulting AChE-based biosensor was further significantly enhanced. Based on the dual inhibition of AChE activity by chlorpyrifos and the formation of Cu-chlorpyrifos complex hindered the electron transfer of CuFe 2 O 4 MNCs toward the electrode surface , the proposed AChE-based biosensor can be applied to the quantification of chlorpyrifos with a linear range from 0.001 μg mL −1 to 1 μg mL −1 and a detection limit of 0.3 ng mL −1 (S/N = 3). This novel dual signal amplification strategy opens up a new avenue for achieving high sensitivity in the field of PEC biosensing.
研究领域:
分析化学
·
环境科学
·
生物传感技术
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Guo Lan,Liu Yuan,Qu Fengli,Liu Zhe,Kong Rongmei,Chen Guang,Fan Wenjing,Xia Lian
A luminescent metal organic framework (LMOF) of type UiO-66-NH 2 was chosen for specific and sensitive detection of trace levels of hypochlorite. Hypochlorite causes the quenching of the blue fluorescence of nano-UiO-66-NH 2 (with excitation/emission maxima at 325/430 nm), and this finding forms the basis for a fluorometric assay for hypochlorite. The method overcomes disadvantages of conventional redox-probes which are interfered by oxidants with oxidation capability stronger than that of hypochlorite. Compared with other fluorescent probes for sensing hypochlorite, UiO-66-NH 2 has a comparable detection limit of 0.3 μmol L −1 and a broad linearity relationship in the range of 1–8 μmol L −1 . The probe was successfully applied to the detection of hypochlorite in complex water samples and living Hela cells.
Schematic representation of hypochlorite induced quenching of the blue fluorescence of nano-UiO-66-NH 2 (with excitation/emission maxima at 325/430 nm) through energy transfer. It overcomes disadvantages of conventional redox-probes which are interfered by oxidants with oxidation capability stronger than that of hypochlorite.
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 已验证
DOI
高影响因子
TALANTA
·
2014
·
IF 3.511
Zeying He,Peng Wang,Donghui Liu,Zhiqiang Zhou
In this study, a novel hydrophilic–lipophilic balanced magnetic nanoparticle , magnetic poly(divinylbenzene-co-N-vinylpyrrolidone) (HLB-MPNP) was successfully synthesized and applied for the extraction and determination of triazine and organochlorine pesticides in environmental water samples. The specific ratio of two monomers , hydrophilic N-vinylpyrrolidone and lipophilic divinylbenzene, endowed the magnetic nanoparticles with hydrophilic–lipophilic balanced character, which made it capable of extracting both polar and nonpolar analytes. The experimental parameters affecting extraction efficiency, including desorption conditions, sample pH, sample volume and extraction time were investigated and optimized. Under the optimum conditions, good linearity was obtained in the range of 0.20–10 μg L −1 for triazine herbicides and 5.0–100 ng L −1 for organochlorine pesticides, with correlation coefficients ranging from 0.994 to 0.999. The limits of determination were between 0.048 and 0.081 μg L −1 for triazine herbicides and 0.39 and 3.26 ng L −1 for organochlorine pesticides. The proposed method was successfully applied in the analysis of triazine and organochlorine pesticides in environmental water samples (ground, river and reservoir).
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2015
·
IF 1.56
Qunxing Huang,Xu Cai,Moussa Mallaye Alhadj Mallah,Yong Chi,Jianhua Yan
The high concentration of heavy metals in solid wastes may cause serious pollution during thermal treatment. We have investigated, theoretically and experimentally, the effects of several important flue gas species and mineral sorbents on the partitioning behaviour of four major heavy metals (cadmium, lead, zinc and copper) which are often present in municipal solid waste (MSW). Their concentrations in bottom ash, fly ash and flue gas were quantified when model MSW samples were treated thermally under different conditions. The evaporation ratio of the four metals, excluding Cu, increased with decreasing oxygen concentration. The presence of HCl promotes heavy metal evaporation by preventing the formation of stable metallic species, especially for Zn (evaporation of more than 20%). An increase in oxygen concentration has a negative influence on the effect of HCl. In the presence of SO2, Cd and Pb exhibited a higher evaporation ratio, while Zn and Cu were insensitive to the change. SO2 also inhibits Cd vaporization in an oxidative atmosphere. The effect of NH3 on reducing the metal volatilization rate was established indirectly. Calcium oxide addition enhances metal evaporation except for that of Zn (which shows a decrease of 38%). Although desulphurization by calcium injection decreases the volume of acid gas, calcium affects heavy metal pollution control adversely. The presence or addition of SiO2- or Al2O3-containing minerals can lead to the formation of stable metallic salts. This may favour the control of Cd, Pb, Zn and Cu volatilization up to 13%, 50%, 17.5% and 19%, respectively.
研究领域:
环境科学
·
废物处理
✓ 已验证
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 6
·1-8
·
IF 5.705
Huang Huayu,Wang Mingxia,Wang Yang,Li Xinli,Niu Zhiying,Wang Xingyu,Song Jinxi
Molybdenum disulfide (MoS 2 ) was used as an electrically conductive skeleton and functionalized with an ionic liquid and gold/silver nanorods. The resulting composite was characterized by scanning electron microscopy, transmission electron microscopy and UV–vis spectroscopy. The composites were used to modify a glassy carbon electrode (GCE) to obtain a sensor for 2,4-dichlorophenol (2,4-DCP). The results show that the oxidation power and electrocatalytic activity of the modified GCE towards 2,4-DCP are enhanced compared to a bare GCE and other modified GCEs. Response is linear in the 0.01 to 50 μM 2,4-DCP concentration range, with a 2.6 nM detection limit. The sensor is highly sensitive and long-term stable. It was successfully applied to the determination of 2,4-DCP in spiked water samples and gave satisfactory recoveries.
Schematic of an electrochemical sensor for the differential pulse voltammetric (DPV) determination of 2,4-dichlorophenol. It is based on the use of an MoS 2 -ionic liquid-Au/Ag nanorod composite.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Mengying Gan,Jianming Pan,Yunlei Zhang,Xiaohui Dai,Yijie Yin,Qin Qu,Yongsheng Yan
Lignin particles were used as stabilizers to establish a stable Pickering oil–water emulsion, and then the molecularly imprinted polymers (MIPs) were fabricated by radical polymerization in the presence of functional and cross-linked monomers in the oil phase. As-prepared MIPs were observed with a diameter from 10 μm to 65 μm when oil/water ratio increased from 0.11 to 0.68, and exhibited thermal stability and hydrophobic surface. A series of static adsorption experiments were conducted to analyze their adsorption performance for lambda-cyhalothrin (LC). The preliminary results showed that MIPs possessed good recognition toward LC , that is, the adsorption equilibrium time was about 3.0 h and the equilibrium adsorption amount was 72.25 μmol g − 1 for MIPs and 43.10 μmol g − 1 for nonimprinted Polymers (NIPs), respectively, indicating the enhanced selectively adsorption of LC. The adsorption process followed pseudo-second-order model by the kinetic analysis and Freundlich equation by the isothermal analysis, respectively. The selective recognition experiments displayed the outstanding selective adsorption effect of the MIPs for target LC. Moreover, the obtained MIPs could be effectively regenerated and recycled at less three times without significant loss of adsorption capacity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）