CRYSTENGCOMM
·
2022
·Vol. 24
·期 22
·4021-4029
·
IF 3.756
Jianan Huang,Bojia Xu,Binghui Ge,Yi Xu,Baobao Cao
Novel zero-dimensional SnO2(ZnO:Sn)m superlattice nanoparticles were synthesized by a simple method of annealing ZnO nanoparticles precoated with a sol–gel Sn–Zn–O precursor. The annealing temperature and duration were systematically evaluated, and the optimum condition was confirmed as 900 °C for 45 min to obtain ideally fully developed layered structures. Cs-corrected scanning transmission electron microscopy (STEM) revealed that the SnO2(ZnO:Sn)m was composed of alternate stacking of a Sn–O octahedral layer and Sn-doped ZnO slab, which resulted from the anisotropic diffusion of Sn atoms in the ZnO basal plane. A gas sensor based on the SnO2(ZnO:Sn)m superlattice nanoparticles exhibited a superior selectivity towards the poisonous gas of hydrogen sulphide (H2S) among six different types of gases (ethanol, H2, CO, NO2, NH3 and H2S), and an extreme low H2S detection limit of 5 ppb at the working temperature of 400 °C, which was about 3–5 orders lower than that of most ZnO-based H2S gas sensors in the literature. The drastic enhancement of the sensing properties of the SnO2(ZnO:Sn)m superlattice nanoparticles was believed to originate from its unique layered structure, which forms a microcirculation of electrons between the Sn–O atomic layers and Sn-doped ZnO slabs with different work functions, thus greatly accelerating the adsorption and desorption rate of gas molecules and increasing the sensor sensitivity. These new SnO2(ZnO:Sn)m superlattice nanoparticles were demonstrated to be a competitive H2S sensing material candidate for practical application. In addition, the facile superlattice nanoparticles fabrication method presented here could be extended to synthesize other ZnO-based superlattice material systems.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 10
·4173-4192
·
IF 2.914
Fu Fengping,He Qian,Zhao Shizheng,Zhu Ting,Liao Fang
The design and fabricate new metal-free photocatalysts is one of the topics in current chemistry. In this paper, we demonstrate the ultrahigh photocatalytic performance of visible light-driven metal-free photocatalyst for selective catalytic reduction of nitro-compounds. The synthesis of 1.5–4.5-nm m-phenylenediamine-Rhodamine B copolymer dots (PmRDs) via simple hydrothermal reaction of Rhodamine B and m-phenylenediamine mixed solution. The obtained PmRDs can be used as visible light-driven metal-free photocatalyst with ultrahigh photocatalytic performance for elective catalytic reduction of nitro-compounds. Due to the hydrogen-bond and specific C–N–N bonding model between the m-phenylenediamine-Rhodamine B copolymer dots (PmRDs) and nitro-compounds, the PmRDs show high photocatalytic activity and selectivity for catalytic reduction of nitro-compounds. Under the irradiation of xenon lamp, 40 ml of 1 mM 4-nitrophenol (4-PN) could be catalyzed by 12 mg catalyst within 5 min, by calculating the rate constants up to 0.766 min −1 (25 °C). In the same way, the PmRDs are also excellent photocatalytic activity and selectivity for different nitro-compounds. Meanwhile, the efficient fast photoinduced electron transfer between the m-phenylenediamine and the Rhodamine B progress significantly improved the photocatalytic performance of PmRDs which is much higher than metal-based (such as: Ag, Ni and Cu) or metallic composite photocatalysts.
研究领域:
材料化学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 18
·17830-17841
·
IF 2.8
Wan Zhonghao,Li Meng,Zhang Qian,Fan Zixi,Verpoort Francis
Magnetic chitosan particles (MCS) were chemically grafted by m-phenylenediamine (mPD) forming a distinctive shell layer with abundant nitrogenous functional groups and used as an adsorbent for the effective removal of Cr(VI) from aqueous solution. By interaction among functional groups in the facile oxidative polymerization process, the grafting of mPD and its polymers on MCS surface was innovatively realized. Through Fourier-transformed infrared spectroscopy, energy dispersive spectrometer, X-ray photoelectron spectroscopy, etc., the chemical properties of MCS before and after modification were characterized and the concurrent reduction-adsorption mechanism in Cr(VI) adsorption by mPD-MCS was carefully analyzed. The maximal Cr(VI) removal performance of mPD-MCS reached 227.27 mg/g, which was significantly better than that of the original MCS. The analysis indicated that Cr(VI) could be efficiently reduced to Cr(III) and the removal of Cr(VI) and Cr(III) was through adsorption and chelation simultaneously by mPD-MCS. Results also indicated that the concurrent reduction-adsorption was enhanced by protonation of nitrogenous functional groups under low pH. The obtained results suggest that mPD-MCS has a good potential in removal and detoxication of Cr(VI) from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 6
·3544-3554
·
IF 5.2
Jie Du,Shuiquan Li,Meichen Wang,Huihui Liu,Yan Wang,Ping Song,Zhi Wang
Reduced graphene oxide (rGO) exerts excellent performance in polymers, but suffers from poor dispersion. Here, the electrostatic interaction between the phenolic hydroxyl group of m-cresol and rGO was discovered for the first time, and benzoxazine with m-cresol containing rGO as the phenolic source were synthesized to achieve a more uniform dispersion of rGO in benzoxazine. The results show that the in situ synthesized rGO/benzoxazine system exhibited superior properties, including a lower curing reaction temperature (21°C relative reductions in curing temperature (225.7°C) for the system with 2 wt% rGO added in situ), higher dielectric constant ((8.69) relative improvement of 0.79), higher electromagnetic shielding value at 8.2–12.4 GHz ((7.45 dB) relative improvement of 0.75 dB), and higher thermal diffusivity at room temperature ((0.162 mm 2 /s) relative improvement of 26%). This study provides a method to homogeneously disperse rGO in benzoxazine without using of a solvent or any other treatment.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2010
·Vol. 66
·期 9
·1191-1206
·
IF 1.014
Yan Shanyin,Chen Wenqiu,Yang Xiaojin,Chen Chuan,Huang Mingfu,Xu Zushun,Yeung Kelvin W. K.,Yi Changfeng
A novel pyridine-containing aromatic diamine monomer, 4-phenyl-2,6-bis[3-(4-aminophenoxy)phenyl]pyridine ( m , p -PAPP), was successfully synthesized by a modified Chichibabin reaction of benzaldehyde and a substituted acetophenone, 3-(4-nitrophenoxy)acetophenone ( m , p -NPAP), followed by a reduction of the resulting dinitro compound 4-phenyl-2,6-bis[3-(4-nitrophenoxy)phenyl]pyridine ( m , p -PNPP) with Pd/C and hydrazine monohydrate. The aromatic diamine was employed to synthesize a series of pyridine-containing polyimides (PIs) by polycondensation with various aromatic dianhydrides in N , N -dimethylformamide (DMF) via the conventional two-step method, and further thermal or chemical imidization forming PIs. The inherent viscosities of the resulting poly(amic acid)s and PIs were 0.59–0.73 and 0.56–0.68 dL/g; most of the PIs obtained by chemical imidization were readily soluble in common organic solvents such as DMF, N , N -dimethylacetamide (DMAc), N -methyl-2-pyrrolidone (NMP), tetrahydrofuran (THF), etc. Meanwhile, strong and flexible PI films were obtained, which had good thermal stability, with the glass transition temperature ( T
g ) of 204.5–237.4 °C and the temperature at 10% weight loss of 527.7–552.0 °C in nitrogen atmosphere, as well as outstanding mechanical properties with tensile strengths of 88.6–90.4 MPa, a tensile moduli of 1.04–1.56 GPa, and elongations at break of 7.2–8.7%. The PI films also were found to possess low water uptake of 0.89–0.98%.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Rong Li,Shidong Ji,Yamei Li,Yanfeng Gao,Hongjie Luo,Ping Jin
Rectangular and plate-like VO 2 (M)@SiO 2 nanoparticles were fabricated by a combination method of hydrothermal synthesis and post annealing process. Rectangular VO 2 (B) nanoplates of 20–30 nm in thickness were hydrothermally synthesized, and VO 2 (B)@SiO 2 core–shell structure was formed using a modified Stober method. Protected by inert SiO 2 shell, after post annealing the VO 2 (B)@SiO 2 was transformed to VO 2 (M)@SiO 2 without deteriorating its original plate-like morphology. Much interestingly, numerous nanopores were formed inside VO 2 (M)@SiO 2 nanoparticles due to the difference in density between VO 2 (B) and VO 2 (M), which contributes to higher optical transmittance and thermal insulation . Thermochromic foils were fabricated using the core–shell nanoparticles, showing promising potential for smart window.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiajie Wang,Bairen Yang,Zhuqiu Sun,Qingqing Shang,Junheng Zhang
This study aimed to investigate the performance of biotrickling filters (BTFs) in the microbial degradation of m -dichlorobenzene ( m -DCB) to construct an enhanced treatment of removing m -dichlorobenzene ( m -DCB) at different concentrations of rhamnolipids (RLs) and lanthanum (La 3+ ) or neodymium (Nd 3+ ) ions. We found a significantly enhanced removal of m -DCB when 110 mg/L of RLs and 0.2 mg/L La 3+ or 0.4 mg/L Nd 3+ ions were added. The addition of RLs and La 3+ or Nd 3+ ions increased the m -DCB average removal efficiency (101–110 days) by 19.7% and 22.7%, respectively, when the inlet m -DCB concentration was 800 mg/m 3 and the empty bed residence time (EBRT) was 60 s. Further, the mechanisms that strengthened the mass transfer were the decrease of contact angle, surface tension, and Henry’s constant after the addition of RLs and La 3+ or Nd 3+ ions in the nutrient solution; further, we noticed a significant increase in the dissolved oxygen levels. Improvements in the performance of BTFs were associated with enhanced microbial community and an increased abundance of functional genes. In conclusion, the addition of RLs and La 3+ or Nd 3+ ions can enhance the performance of BTFs in degrading m -DCB by improving mass transfer and microbial activity simultaneously.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 8
·4444-4453
·
IF 3.361
Ruotong Liu,Chanling Yuan,Yin Feng,Jiayi Qian,Xiaoting Huang,Qiutong Chen,Shuyuan Zhou,Yin Ding,Bingbing Zhai,Wenjie Mei,Liangzhong Yao
Ru(II) complexes have attracted increasing attention as promising antitumor agents for their relatively low toxicity, high affinity to DNA molecules, and correlation with multiple targets. Meanwhile, quinolones are synthetic antibacterial agents widely used in the clinical practice. In this paper, two novel Ru(II) complexes coordinated by levofloxacin (LOFLX), [Ru(bpy)2(LOFLX)]·2ClO4 (1), and [Ru(dmbpy)2(LOFLX)]·2ClO4 (2) (bpy = 2,2′-bipyridine, dmbpy = 4,4′-dimethyl-2,2′-bipyridine) were synthesized with high efficiency under microwave irradiation and characterized by ESI-MS, 1H NMR, and 13C NMR. The binding behavior of these complexes with double-strand calf thymus DNA(CT-DNA) was investigated using spectroscopy, molecular docking, and density functional theory calculations. Results showed that 2 exhibited higher binding affinity than 1 and LOFLX. Further studies showed that 2 could induce the G2/M phase arrest of A549 cells via DNA damage. In summary, these results indicated that 2 could be developed as a potential anticancer agent in treatment of lung cancer through the induction of cell cycle arrest at G2/M phase by triggering DNA damage.
研究领域:
药理学
·
肿瘤学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 17
·7920-7932
·
IF 8.867
Lina Xu,Jia Xu,Baotian Shan,Xiulin Wang,Congjie Gao
Novel thin-film composite (TFC) membranes were elaborately designed and fabricated via the incorporation of mussel-inspired dopamine (DA) into an m-phenylendiamine (MPD) aqueous solution followed by interfacial polymerization with trimesoyl chloride (TMC) on a macroporous substrate. This DA-incorporation strategy was distinct from the previous DA layer serving as a hydrophilicity–promoter or reactive intermedia. The elastic structure of the polyamide (PA) layer and the hydrophilicity of both the PA layer and substrate were in situ flexibly manipulated by regulating the DA/MPD mass ratio and solution pH. The optimized TMC/MPD–DA TFC membranes achieved a significantly enhanced water flux (50 L m−2 h−1, improved 3-fold compared to the conventional TMC/MPD membrane) and a comparable reverse salt flux of 8.19 g m−2 h−1 for forward osmosis (FO) using deionized water as the feed along with 1 M NaCl draw solution in the FO mode. It also yielded a superior water permeability (A) of 1.8 L per m2 per h per bar compared to the TMC/MPD membrane (1.0 L per m2 per h per bar) while maintaining a NaCl rejection of over 92% at 2 bar. The proposed synergistic interaction between DA and MPD in aqueous solution responding to the solution pH played a crucial role in controlling the interfacial polymerization process. Michael addition and Schiff base reaction between PDA and MPD at a proper pH (8.5) could weaken both the residual DA monomer and the PDA aggregate generation, facilitating the establishment of a defect-free and uniform PA layer with a proper cross-linking degree to enhance the water transport. This DA-incorporation strategy for the TFC membrane demonstrated here sheds light on the exploration of high water transport for highly efficient FO and other desalination processes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2020
·Vol. 38
·期 12
·1703-1708
·
IF 3.826
Yuxin Wang,Ling Zhang,Jiaying Bi,Hao Yang,Zhikun Zhao,Daobin Mu,Borong Wu
Summary of main observation and conclusion We successfully prepared the Li-VO 2 (M) nanosheets via a facile lithiation method. After compositing with conductive carbon fibers, the sulfur host (Li-VO 2 (M)@CFs) combines the efficient adsorption ability of the VO 2 (M) with superior electronic conductivity of the carbon fibers. Besides, carbon fiber cloth used as the current collector can provide the 3D electronic channels. Therefore, the coin cells exhibited the superior reversible capacity of 1250 mA h g –1 at 0.2 C and a low capacity decay value of 0.068% per cycle within 416 cycles at 1 C, indicative of the favorable cycling stability. Moreover, even at a high rate of 5 C, it also kept at a high discharge capacity of 401 mA h g –1 . In conclusion, this work discloses an attractive route to reduce the dissolution loss of lithium polysulfides (LiPSs) and enhance the overall performance of Li-S batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Kaidi Hu,Jianlong Li,Tianye Zhao,Qiao Zhou,Qin Li,Xinjie Hu,Guoquan Han,Shuhong Li,Likou Zou,Shuliang Liu
As a major intermediate metabolite of synthetic pyrethroids , the occurrence of 3-phenoxybenzoic acid hinders the decomposition of the parent pesticide and poses uncertain risks to environmental ecology and living organisms. Strain Aspergillus oryzae M-4 was previously reported to degrade 3-PBA and several substances were identified as downstream transformation products (TPs). But the mechanism underlying the cleavage of ether bond remains largely unclear. Here, we attempted to address such concern through identifying the peripheral TPs and analyzing transcriptomics, coupled with serial batch degradation experiments. Analysis results of chromatographic/mass spectrometry suggested that 3-PBA underwent twice hydroxylation , to yield mono- and dihydroxylated 3-PBA successively. In parallel, a mutual transformation between 3-PBA and 3-phenoxybenzyl alcohol (3-PBOH) also existed. The proposal of peripheral pathway represents an important advance towards fully understanding the whole 3-PBA metabolism in M-4. A specific altered metabolization was found for the first time, that is, resting cells of M-4 skipped the reduction step and initiate hydroxylation directly, by comparison with growing cells. Transcriptome analysis indicated that 3-PBA induced the up-regulation of genes related to energy investment, oxidative stress response, membrane transport and DNA repair. In-depth functional interpretation of differential expression genes suggested that the generation 3-PBOH and hydroxylated 3-PBA may be due to the participation of flavin-dependent monooxygenases (FMOs) and cytochrome P450 (CYP450), respectively. This study provides new insight to reveal the biodegradation mechanism of 3-PBA by A . oryzae M-4.
研究领域:
环境科学
·
微生物学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Qing Zhou,Kaiyu Lin,Yongxin Liu,Guohan Sun,Shumei Wang,Haiyun Zhai
A novel nonenzymatic electrochemical sensor with high sensitivity for detecting organic phosphate (OPS) in medicinal herbs was fabricated based on a Mg-Al layered double hydroxide (Mg-Al LDH) nanocomposite glassy carbon electrode (GCE) modified with a poly-m-amino-benzenesulfonic acid (p-m-ABSA) film. Depositing Mg-Al LDH nanocomposites onto the surface of the p-m-ABSA composite resulted in an effective electrical response by increasing the electrode surface area and enhancing the electron transfer process, so the electrocatalytic activity was significantly enhanced. The research illustrated that the fabricated sensor (Mg-Al LDH/p-m-ABSA/GCE) exhibited strong affinity, high sensitivity, and selectivity towards methyl parathion (MP) and fenitrothion (FNT). Scanning electron microscopy (SEM) was used to characterize the surface morphology of the modified electrode and showed that the p-m-ABSA film and a few p-m-ABSA nanoparticles were coated on the surface. The surface area of the electrode was further enlarged by Mg-Al LDH owing to their layered nanostructure. Under optimal conditions, the anodic current had a linear relation equal to 0.1∼20.0 µM MP and 0.01∼50.0 µM FNT, with detection limits (S/ N = 3) of 33.0 nM MP and 3.5 nM FNT, respectively. Furthermore, Mg-Al LDH/p-m-ABSA/GCE was successfully used for the detection of MP and FNT in Astragalus and Magnolia medicinal herb samples.
研究领域:
分析化学
·
环境科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）