JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Hui Zhang,Mengya Li,Jie Li,Guangli Wang,Feng Li,Dayong Xu,Yuan Liu,Minghua Xiong
A natural consortium, named L1, of Rhodococcus sp. JT-3 and Brevundimonas sp. JT-9 was obtained from quizalofop- p -ethyl (QE) polluted soil. The consortium was able to use QE as a sole carbon source for growth and degraded 100 mg L −1 of QE in 60 h. Strain JT-3 initiated the catabolism of QE to quizalofop acid (QA), which was used by strain JT-9 as carbon source for growth and to simultaneously feed strain JT-3. A novel esterase EstS-JT, which was responsible for the transformation of QE to QA and essential for the mineralization of QE by the consortium, was cloned from strain JT-3. EstS-JT showed low amino acid identity to other reported esterases from esterase family VIII and represents a new member of this family. The deduced amino acid sequence contained the esterase family VIII conserved motifs S-X-X-K, YSV and WAG. The purified recombinant EstS-JT displayed maximal esterase activity at 35 °C and pH 7.5. An inhibitor assay, site-directed mutagenesis and 3D modeling analysis revealed that S 64 , K 67 and Y 175 were essential for catalysis and probably comprised the catalytic center of EstS-JT. Additionally, EstS-JT had broad substrate specificity and was capable of hydrolyzing p -nitrophenyl esters (C 2 -C 8 ) and various AOPP herbicides.
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高影响因子
JOURNAL OF CRYSTAL GROWTH
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2013
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IF 1.552
Y.F. Zhang,L. Huang,Y.B. Sun,B. Han,H.S. Cheng
In this work, we reported on the synthesis and characterization of (Z)-4-oxo-4-ureido-but-2-enoic acid and p-toluenesulfonic acid 3-nitrophenyl ester and their detailed crystal structure information were studied. The crystallization of (Z)-4-oxo-4-ureido-but-2-enoic acid results in reduced π -conjugation in the molecule and weaker intra-molecular hydrogen bonding. The main driving force for the molecular self-assembly of (Z)-4-oxo-4-ureido-but-2-enoic acid was found to be the strong intermolecular hydrogen bonds . Compared with (Z)-4-oxo-4-ureido-but-2-enoic acid with six type of strong H-bonds, p-toluenesulfonic acid 3-nitrophenyl ester possesses much lower melting point (110–111°C), average packing energy (−3.7 kcal mol −1 ), molecular deformation energy (−0.6 kcal mol −1 ) and highest torsional angle change (9.3°). This can be ascribed to the week intermolecular interaction between center molecule and adjacent molecules.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xingyue Wei,Hanmin Zhang,Mengbo Cao
In this study, a series of Co-doped NPC biochar (nCo-NPC) was prepared by one-step pyrolysis of N and P-rich Chlorella pyrenoidosa (CP) waste mixed with cobalt nitrate for heterogeneous catalytic ozonation (HCO) degradation of ibuprofen (IBU). Compared to the HCO process using CoOx or NPC catalysts, the 2Co-NPC catalyst showed superior performance in the degradation of IBU due to the synergistic effect between the CoOx and NPC. The 2Co-NPC catalyst exhibited high stability after five trials, with the removal efficiency decreasing from 99.9 % to 85.4 %. Moreover, hydroxyl radicals ( OH) and adsorbed atomic oxygen (*O) were identified as the main active species in 2Co-NPC HCO process. The coupling of NPC and CoOx formed electron-rich Co(II) center and electron-deficient NPC center. The electron-rich Co(II) center can direct decomposition of adsorbed ozone into *O and further convert to OH. The electron-deficient NPC center gained electrons from organic pollutants, C N, C O, and P groups through C O Co and C N Co bonds, stimulating the π-cation reaction to transfer to the Co(II) center, thus accelerating the cycling between Co(II) and Co(III). Additionally, the deprotonation of surface hydroxyl groups may also serve as a potential active site for the decomposition of ozone into OH. This study used biomass CP as a precursor coupled with cobalt salt, revealing electron transfer pathways and providing new insights for the future developing of low-cost, efficient, and stable ozone catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Wenhao Xi,Tongchen Wu,Pan Wang,Wenlong Huang,Bifen Gao,Liwen He,Yilin Chen,Bizhou Lin
Transition metal phosphides (TMPs) with high electrocatalytic activity for the oxygen evolution reaction (OER) are reckoned as a substitution of precious group metals catalysts in rechargeable Zn-air battery. In this work, Co/Co 2 P heterojunction nanoparticles supported N,P-doped carbon nanosheets (Co/Co 2 P@NPCNS) were designed and prepared via a facile one-step molten salt-assisted pyrolysis process. Density function theory calculations reveal that the heterogeneous interactions of Co/Co 2 P effectively enhance the bifunctional electrocatalytic activity for oxygen reduction reaction (ORR) and OER. The synergistic interaction between the Co/Co 2 P heterojunction nanoparticles with highly exposed active sites and excellent catalytic activity and the two-dimensional doped carbon nanosheets with high conductivity contributes to Co/Co 2 P@NPCNS exhibiting preeminent bifunctional ORR/OER activity and stability with a high half-wave potential for ORR (0.87 V), a low overpotential for OER (302 mV at 10 mA cm −2 ) and a low potential gap (0.66 V). The homemade rechargeable Zn-air battery performs high peak power density (187 mW cm −2 ) and exceptional endurance. This heterogeneous interface tactic of integrating TMPs with heteroatom-doped carbon materials may shed light on the research and development of non-precious metal electrocatalysts.
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Advanced Optical Materials
·
2024
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IF 8
Xiujuan Wang,Shuang Gao,Zhuo Han,Xiaodong Zhang,Haoran Chen,Kang Xiang,Muyang Ye,Junxing Qiu,Chunyan Wu,Xiaoping Yang,Tianci Zhang,Qian Gao,Kun Xing
Heterojunction phototransistor (HPT) is considered the most promising detector technology in weak ultraviolet (UV) signal detection due to its inherent internal gain through transistor action. However, achieving high-performance self-powered UV HPTs remains a significant challenge. In this study, a high-performance self-powered p + -GaN/n − -ZnO/Au UV HPT with ZnO serving as the floating base is cleverly designed. The device features a unique back-to-back configuration of the p + -GaN/n − -ZnO heterojunction and n − -ZnO/Au Schottky junction, along with an ultrathin ZnO base layer of a 3D nanowire network structure. This design enables the fabricated p + -GaN/n − -ZnO/Au UV HPT to operate in a self-powered mode with exceptional performance metrics. Under zero bias, the device exhibits outstanding characteristics including ultralow dark current of 1.7 × 10 −13 A, remarkable I photo /I dark ratio of 10 6 , fast response speed (t r = 150 µs / t f = 250 µs), high responsivity of 9.74 A W −1 , and detectivity of 1.58 × 10 14 Jones, representing the best result achieved for UV HPTs thus far at zero bias. Moreover, the fabricated UV HPT is successfully demonstrated in solar-blind imaging and UV communication systems without the need for an external power supply. This work presents effective and practical design strategies for achieving high-performance self-powered UV HPTs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yang Xiang,Linjian Yu,Kun Xiong,Haidong Zhang,Jia Chen,Xueqing Shi,Min Deng,Shiqian She
Using urea oxidation reaction (UOR) instead of oxygen evolution reaction (OER) is one of promising strategies for significantly diminish power consumption for hydrogen production from electrochemical water splitting. The electrocatalysts with cost-effective, multifunctional and high-performance are urgently required for enhancing UOR and hydrogen evolution reaction (HER), but this remains a challenge. Herein, we designed a bifunctional Ni(OH) x /p-Ni catalyst by electrochemical oxidation of Ni(OH) 2 in-situ grown on the surface of porous Ni membrane (p-Ni) to generate more abundant high-valence Ni 3+ active species, which is favorable for reducing the energy barrier of electrochemical reaction . At the same time, a large number of metallic oxygen bonds (Ni–O) were formed to optimize the reaction kinetics of the electrochemical process, thus promoting the overall urea electrolysis efficiency. In 1.0 M KOH with 0.3 M urea, the optimized Ni(OH) x /p-Ni only requires potentials of 1.38 V and 0.22 V to obtain a current density of 100 mA cm −2 for UOR and HER, respectively. Notably, by assembling the Ni(OH) x /p-Ni as the cathode and anode for hydrogen production from urea-assisted water splitting, it can drive a current density of 100 mA cm −2 at a low voltage of 1.52 V and has excellent stability. This work provides a feasible strategy for design efficiently non-noble metal electrocatalysts for energy-saving hydrogen production and purifying urea-rich wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jiahui Li,Boxuan Peng,Siyuan Yu,Fangzheng Zhao,Qiqi Han,Shuaibing Huang,Fengmin Jin,Jinfeng Xing
With the rapid development of industry, water pollution has become one of the important problems that harm the ecological environment and human health. The extensive use and random discharge of dyes have caused serious damage to water resources. Hydrogel bead is a promising material for dye adsorption due to its advantages of rich functional groups and high specific surface area. Here, acrylic acid sodium salt (AAS) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as monomers, N,N’-Methylene-bis-acrylamide (MBA) as crosslinking agent, sodium alginate (SA) as semi-interpenetrating network component, laponite as nano-clay additive, and single 2′,4′,5′,7′ −tetrabromofluorescein disodium salt (EY)/ Triethanolamine (TEOA)/ diphenyl iodonium hexafluorophosphate (DPI) as green light polymerization initiating system were combined to prepare composite hydrogel beads within 10 s under green LED irradiation. The composite hydrogels were characterized by infrared spectroscopy (FTIR), thermogravimetric analyzer (TG), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The addition of sodium alginate and laponite can improve the mechanical properties of hydrogel beads. In the adsorption study of malachite green, the influence of time, temperature, dye concentration, pH, ionic strength, and other factors on the adsorption effect were investigated. The adsorption process was consistent with the second-order kinetic process and Langmuir adsorption. At room temperature, the highest adsorption capacity of the hydrogel beads for malachite green reached 829.63 mg/g. The PAAS-SL hydrogel beads maintained a high adsorption effect in the pH range (3–10), and the capacity reached 575.0 mg /g at pH 3, which had a good ability to resist low pH. In the adsorption–desorption experiments, the removal rate of PAAS-SL hydrogel beads for MG is still more than 80 % after 5 cycles. Our research provides a promising strategy for the efficient and rapid preparation of hydrogel beads with excellent properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Zicheng Du,Baojie Liu,Xiaoying Liu,Lu Liu,Chen Liang,Shuangquan Yao,Chengrong Qin
Separating low condensed lignin from lignocellulosic biomass is of great importance for achieving its full component conversion. This study proposed a new efficient and environmentally friendly alcohol/acid pretreatment system using 1,4-butanediol (1,4-BDO) as a solvent, combined with p -toluene sulfonic acid ( p -TsOH) to efficiently separate low condensed lignin. The results showed that the system could remove 85.55 % of hemicellulose and 84.78 % of lignin in a short time, with a high retention rate of cellulose. Based on the phenomenon of 1,4-BDO molecule protecting lignin structure, the recovered low-condensed lignin structure contains the main aliphatic hydroxyl structure, and the remaining solid surface lignin condensation grains were fewer, and the fiber crystallinity was high, which was beneficial for the preparation of high-value products. In addition, the lignin dissolution kinetics revealed that the p -TsOH/1,4-BDO pretreatment had a lower reaction activation energy, clarifying the solvation effect of 1,4-BDO on efficient lignin dissolution. Finally, combining density functional theory (DFT) from the molecular level clarified that the hydrogen bonding and conjugated effect between 1,4-BDO and lignin structure could effectively reduce the self-condensation reaction of lignin molecules. This study achieved effective separation of lignocellulosic biomass, providing a theoretical basis for the application of 1,4-BDO in biomass component separation, and promoting the development of green and efficient component separation technologies.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Siying Chen,Linfeng He,Jing Zou,Shiyi Yang,Lingxin Chen,Yingna Hou,Dongmei Xu,Zhongda Yan,Sheng Li,Jianying Wu
Peracetic acid (PAA) has garnered considerable interest due to its exceptional disinfection properties and strong oxidizing capabilities. However, the coexistent hydrogen peroxide (H 2 O 2 ) in the PAA solution, which has similar chemical characteristics with PAA, makes accurate measurement of PAA concentration challenging. In this study, a rapid, sensitive, and reliable spectrophotometric method for determining PAA was developed. The method involves the oxidation of N , N -diethyl- p -phenylenediamine (DPD) by Co(II)-catalyzed PAA, resulting in the formation of a stable pink DPD radical (DPD ●+ ). It is worth noting that Co(Ⅱ) is an excellent PAA catalyst but is inactive with H 2 O 2 . Consequently, there is minimal interference from the coexistent H 2 O 2 in the determination of PAA. The absorbance of DPD ●+ at 551 nm was well linear (R 2 > 0.999) with concentrations of PAA in the range of 0–80 μM under optimized reaction conditions, and the limit of detection was determined to be low as 0.175 μM. Furthermore, the proposed Co(II)-DPD spectrophotometric method demonstrates strong resistance to common natural water constituents (ferric ions, sulphate ions, nitrate ions, chloride ions, bicarbonate ions, and humic acid) and is suitable for the accurate determination of PAA in natural water sources like groundwater and surface water. Additionally, the proposed Co(II)-DPD spectrophotometric method was dependable for quantifying PAA concentrations and monitoring PAA changes in Co(II)/PAA, Cu(II)/PAA, Fe(II)/PAA, and hydroxylamine/Fe(II)/PAA processes. In conclusion, the proposed Co(II)-DPD spectrophotometric method can be utilized as an alternative method for the rapid and accurate determination of PAA in water.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
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IF 4.6
Ahsan Nazir,Ameena Tur Rasool,Chuntao Chen,Bianjing Sun,Dongping Sun
In this study, a NiO-PbBiO 2 Br photocatalyst was developed by a simple chemical precipitation approach followed by a hydrothermal process to eliminate tetracycline (TC). The resultant materials were assessed utilizing diverse characterization techniques. Compared with pure PbBiO 2 Br (49.5 %) and NiO (56.8 %), the NiO-PbBiO 2 Br composite exhibited superior photocatalytic effectiveness for removing TC under visible light and achieved a remarkable 98.4 % elimination of TC within 70 min (conditions: [TC] = 10 mg/L, pH 7 and [catalyst] = 1 g/L). The reaction rate constant (K) values are in the following order: NiO-PbBiO 2 Br (0.0591 min −1 ) > NiO (0.0119 min −1 ) > PbBiO 2 Br (0.0097 min −1 ). The markedly improved photocatalytic efficiency of NiO-PbBiO 2 Br can be ascribed to the expanded light absorption and the establishment of p-n heterojunction amid NiO and PbBiO 2 Br. The effects of several important factors, e.g. TC concentration, pH, catalyst dosage, and different water sources, were thoroughly investigated. Cycle tests were performed to confirm the stability and reusability of NiO-PbBiO 2 Br. Furthermore, electron spin resonance (ESR) and radical scavenging studies verified that the species •O 2 − , h + , and •OH play a key role in removing TC. The susceptible active regions of TC and the probable TC degradation routes were examined through density functional theory (DFT) calculations and high-performance liquid chromatography (HPLC) analyses. Thus, this work presents a new methodology for creating a photocatalyst with enhanced photocatalytic effectiveness for removing organic pollutants in water.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2013
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IF 2.487
Ting Yang,Feifei Xu,Jinhui Xu,Danjun Fang,Ying Yu,Yun Chen
P-glycoprotein (P-gp) is the most frequently proposed factor for multi-drug resistance. It is traditionally measured using antibody-based methods. While these techniques can provide relative quantification values for P-gp levels, the important information that is usually missing is its amount in the biological system. In this study, a novel and advanced liquid chromatography–tandem mass spectrometry (LC/MS/MS)-based targeted proteomics assay was developed and validated for the determination of P-gp in the breast cancer drug sensitive cell line MCF-7/WT and the drug resistant cell line MCF-7/ADR. Three tryptic peptides (434STTVQLMQR442, 674GSQAQDR680 and 368IIDNKPSIDSYSK380) can specifically represent P-gp. Among these peptides, 434STTVQLMQR442 was selected as the surrogate analyte for quantification, and a stable isotope-labeled synthetic peptide with the same sequence was used as an internal standard. The calibration range was validated from 10 to 1000 ng/mL. The intra- and inter-day precisions were within 5.9% and 3.7%, respectively. The accuracy for the quality control (QC) samples was within 8.0%. Using this assay, the amounts of P-gp were accurately quantified as 3.53 fg/cell (∼2.08 × 10 −2 amol/cell) in the MCF-7/WT cells and 34.5 fg/cell (∼2.02 × 10 −1 amol/cell) in the MCF-7/ADR cells. This outcome was then compared with those obtained by conventional analytical methods including confocal microscopy, western blotting and flow cytometry. The comparative results show that not only is the LC/MS/MS-based targeted proteomics assay able to monitor the protein levels in a more accurate manner, but the large discrepancy observed between the other methods was most likely due to the lack of specificity and the semi-quantitative nature of the conventional assays
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 56
·50993-51004
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IF 3.289
Beibei Lu,Lei Li,Lulu Wei,Xuhong Guo,Jun Hou,Zhiyong Liu
Well-defined amphiphilic β-cyclodextrin (β-CD) star-shaped copolymers with poly(ε-caprolactone)–poly(2-(2-methoxyethoxy)ethyl methacrylate)-co-poly(ethylene glycol)methacrylate) (β-CD–(PCL–P(MEO2MA-co-PEGMA))21 were synthesized via ring opening polymerization (ROP) and atom transfer radical polymerization (ATRP). These thermo-responsive copolymers exhibited a lower critical solution temperature (LCST) in water, which could be finely tuned by changing the feed ratio of PEGMA and MEO2MA. The LCST of star-shaped β-CD–(PCL–P(MEO2MA-co-PEGMA))21 increased from 26 to 62 °C with the increasing PEGMA content, the copolymers were characterized using Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC). The star-shaped copolymers could self-assemble into micelles in aqueous solution due to their amphiphilic properties resulting from the hydrophobic β-CD and PCL core and the hydrophilic P(MEO2MA-co-PEGMA) segments, which was investigated by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The in vitro DOX release studies showed that DOX released from drug-loaded micelles in a thermo-sensitive manner. CCK-8 assays demonstrated that these star-shaped copolymers could possess low cytotoxicity against HeLa cells, and the DOX-loaded micelles exhibited a higher inhibition of the proliferation of HeLa cells in comparison with free DOX. Moreover, the results from confocal laser scanning microscopy (CLSM) revealed that these polymeric micelles could efficiently deliver and release DOX into the nuclei of HeLa cells. This kind of biodegradable, biocompatible and stimuli-responsive copolymer could serve as a promising material for drug delivery.
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