CHEMOSPHERE
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2016
·
IF 3.698
Zhen Yang,Kexin Ren,Eric Guibal,Shuying Jia,Jiachun Shen,Xuntong Zhang,Weiben Yang
A flocculation method was used for the removal of trace nonylphenol (NP) from synthetic surface water containing natural organic matters (humic acid, HA) and suspended inorganic particles (kaolin). A polymeric flocculant (CMCND), with enhanced cationic property and unique switchable hydrophobic/hydrophilic characteristic, was specially designed for this application. CMCND showed a high efficiency for trace NP removal, turbidity and UV 254 abatements: under optimized conditions (pH: 4; T: 35 °C; dosage: 40 mg/L), the removal of NP reached up to 79%. By using dosage-pH flocculation diagrams and correlation analyses as tools, kaolin and HA were found to exert synergistic effects on NP removal, with the aid of CMCND; the synergistic effect of HA is higher due to π-π stacking. Zeta potential-dosage profiles clearly demonstrated charge neutralization predominated at pH 4, due to the strong cationic groups in the flocculant. Floc size monitoring displayed that the delayed phase transformation process (from hydrophilicity to hydrophobicity) of CMCND at 35 °C enhanced NP removal. In addition, spectral analyses clarified the interactions among CMCND, NP, kaolin and HA: charge attraction and hydrophobic interaction between CMCND and NP played the key roles. The findings are of significance for removing endocrine-disrupting chemicals in environmental remediation.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 48
·18990-19002
·
IF 8.262
Liguang Dou,Hui Zhang
A series of novel hierarchical nanosheet array-like hybrids xCu-LDH/rGO (xCu-LDH: CuxMg3−xAl-layered double hydroxide (x = 0.5, 1.0, and 1.5), rGO: reduced graphene oxide) were assembled via a facile and green aqueous-phase coprecipitation method. Systematic characterization suggests that the hybrids were constructed by hexagonal LDH nanoplates (∼70 nm × 4.5 nm) interdigitated vertical to the surface of single-layer rGO. All the xCu-LDH/rGO hybrids exhibit a remarkable higher activity for catalytic reduction of 4-nitrophenol (4-NP) compared with pure Cu-LDH, commercial Pt/C and other recently reported Cu-related catalysts. These findings were carefully explained by deep study of the catalyst treated with NaBH4, and the xCu-LDH/rGO hybrids as a potential Cu2O reservoir were revealed for the first time. Typically for 1.0Cu-LDH/rGO, a part of Cu2+ ions on LDH layers were instantaneously in situ reduced to well-dispersed ultrafine Cu2O nanoparticles (∼6.8 nm) by NaBH4 in an aqueous reduction system and thus formed relatively strong interaction between Cu2O and LDH/rGO greatly favoring enhanced activity for the reduction of 4-NP, other nitroarenes and organic dyes at room temperature. The excellent activity of the xCu-LDH/rGO hybrids can be attributed to the possible Cu2O–Cu-LDH–rGO three-phase synergistic effect, increased adsorption capacity for reactants via π–π stacking, and unique nanoarray-like morphology of the hybrids. Moreover, the 1.0Cu-LDH/rGO can be cycled for 20 runs without significant loss of activity, giving the hybrid long-term stability.
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Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 24
·3534-3540
·
IF 4.592
Jiao Jiao,Haiyan Wang,Wanchun Guo,Ruifei Li,Kesong Tian,Zhaopeng Xu,Yin Jia,Yuehao Wu,Ling Cao
Graphical Get the yolk ! A hierarchical yolk–shell Fe@SiO 2 /Ni catalyst with an inner movable Fe core and an ultrathin SiO 2 /Ni shell assembled from nanosheets was synthesized by a self-templating reduction strategy (see figure). The spatial confinement of 4 nm Ni nanoparticles in ultrathin SiO 2 nanosheets (2.6 nm thick) could prevent their agglomeration during catalytic reductions and expose the abundant active Ni sites to reactants, to provide high activity and stability. Ni-based magnetic catalysts exhibit moderate activity, low cost, and magnetic reusability in hydrogenation reactions. However, Ni nanoparticles anchored on magnetic supports commonly suffer from undesirable agglomeration during catalytic reactions due to the relatively weak affinity of the magnetic support for the Ni nanoparticles. A hierarchical yolk–shell Fe@SiO 2 /Ni catalyst, with an inner movable Fe core and an ultrathin SiO 2 /Ni shell composed of nanosheets, was synthesized in a self-templating reduction strategy with a hierarchical yolk–shell Fe 3 O 4 @nickel silicate nanocomposite as the precursor. The spatial confinement of highly dispersed Ni nanoparticles with a mean size of 4 nm within ultrathin SiO 2 nanosheets with a thickness of 2.6 nm not only prevented their agglomeration during catalytic transformations but also exposed the abundant active Ni sites to reactants. Moreover, the large inner cavities and interlayer spaces between the assembled ultrathin SiO 2 /Ni nanosheets provided suitable mesoporous channels for diffusion of the reactants towards the active sites. As expected, the Fe@SiO 2 /Ni catalyst displayed high activity, high stability, and magnetic recoverability for the reduction of nitroaromatic compounds. In particular, the Ni-based catalyst in the conversion of 4-nitroamine maintained a rate of over 98 % and preserved the initial yolk–shell structure without any obvious aggregation of Ni nanoparticles after ten catalytic cycles, which confirmed the high structural stability of the Ni-based catalyst.
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CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Haijun Chen,Chao Liu,Min Wang,Chaofeng Zhang,Gao Li,Feng Wang
Well-defined gold nanoclusters with average size less than 2 nm have emerged as a new and novel catalyst. The gold nanocluster loaded on the oxide surface usually aggregates to larger particles at high temperature (> 300 °C), which is caused by the removal of the surface ligands. We herein present a novel method to prepare Au 25 cluster catalyst (∼1.3 nm) with high thermal stability (up to 400 °C). Au 25 @SiO 2 is synthesized via a co-hydrolyzing reaction of Au 25 [SC 3 H 6 Si(OCH 3 ) 3 ] 18 and tetraethyl orthosilicate, and then it is treated at different temperature (e.g., 200, 300, 400 °C) in air to remove the organic ligands. Au 25 @SiO 2 is well characterized by transmission electron microscopy, ultraviolet-visible spectroscopy and diffuse reflectance UV-vis spectroscopy. Further, the Au 25 @SiO 2 catalysts are investigated in the hydrogenation of p -nitrophenol into p -aminophenol.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Ke Shi,Hong Zhang,Jikun Gao,Jiaqian Zhang,Xiangnan Zhang,Guangfeng Kan,Jie Jiang
Nanoplastics released from consumer plastic food containers are emerging environmental pollutants and directly ingested as part of the diet. However, quantification methods for nanoplastics are still lacking. Herein, a rapid identification and mass quantification approach was developed for nanoplastics analysis by combining electromagnetic heating with pyrolysis mass spectrometry (Eh-Py-MS). The pyrolysis products directly entered into the MS, which omits the gas phase separation process and shortens the detection time. A compact pyrolysis chamber was used and this increased the sample transfer efficiency and lowered power requirement. The operational parameters were systematically examined. The influence of nanoplastic size, additive, humic acid, and aging on detection was investigated, and it was concluded that environmental factors (humic acid, aging) and plastic properties (size, additives) did not influence the detection. The developed chamber showed that the limit of detection of polystyrene (PS) nanoplastics was 15.72 ng. Several typical food packages were demonstrated with satisfactory recovery rates (87.5–110%) and precision (RSD ≤11.36%). These results suggested that the consumer plastic food containers are a significant source of direct exposure to nanoplastics in humans from the environment.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xunzhi Deng,Ze Liao,Jing Lu,Haiou Li,Xianxin Zhu,Yilin Liu,Qinyao Li,Danyi Deng,Chao Huang,Zhoufei Luo
The presence of alkylphenolic residues in vegetables could pose a potential food safety risk for humans. The residues of alkylphenols in bean sprouts have not been reported. Magnetic dispersion solid phase extraction (MD-SPE) followed by ultra performance liquid chromatography-tandem mass spectrometry was developed for detecting alkylphenol residues in sprouts. The Fe 3 O 4 @rGO@poly 3-aminophenol composite was first synthesized and used as an effective and regenerate adsorbent for MD-SPE. This method features minimal use of organic reagents, high extraction efficiency, easy recovery via magnetic separation, and the reusability of the adsorbent. The magnetic composite was characterized using X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. For optimization of the extraction process, the Plackett-Burman factorial design was employed to to fine-tune multiple parameters of MD-SPE. Additionally, the sensitivity of UPLC-MS/MS enabled the precise quantification of alkylphenols in the sprout samples. This analysis yielded high linearities (R 2 > 0.9989) and recoveries (90.4 %–108.5 %) at three different spiked levels. a minimal matrix effect (7.5 %–12.4 %), impressive limits of detection (0.89–13.62 pg/mL), and reliable reproducibility (intra-day: 2.0 %–13.5 %; inter-day: 0.7 %–11.6 %) were obtained. Thus, a new method was successfully employed for analyzing alkylphenolic residues in vegetables samples, making it a valuable tool for ensuring food safety.
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TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Xia Li,Yi Li,Huimin Yang,Anjie Liu,Songwei Zhang,Litian Hu
The demand of high-performance additives suitable for lubricating grease is increasing with the development of high-end equipment. Herein, a novel thiophosphate 3-(O, O- di-nonylphenol di-thiophosphate)-2-methylpropanoic acid (NDMA) was synthesized and added to lithium complex grease as an extreme pressure and anti-wear additive. The physicochemical, rheological, and tribological properties of NDMA were studied and compared with ZDDP. The results indicate that NDMA can improve and enhance oil separation under pressure and dropping point. NDMA showed better shearing resistance, friction reducing, anti-wear and load carrying capability than ZDDP. The lubrication mechanism of NDMA was demonstrated through molecular dynamics simulation. The results indicate that NDMA has strong adsorption capacity on sliding surfaces, promoting the tribo-chemistry reaction between NDMA and iron surfaces.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xianghan Cheng,Yalin Liu,Man Yang,Xiaoli Wang,Aili Wang,Zhen Li,Zhongmin Liu,Yong-Zheng Zhang,Xiuling Zhang,Da-Shuai Zhang,Shujuan Zhuang,Longlong Geng
Developing metal oxide catalysts with comparable activity to precious metals has become a hot but challenging area of research for wastewater purification. Herein, CoO x particles and nitrogen co-doped carbon with a hierarchical structure were designed and synthesized via a temperature-controlled pyrolysis strategy using inert Co-based metal–organic frameworks (Co-MOFs) as precursors. Unlike traditional methods, the exquisite pyrolysis of the Co-MOF at 400 °C enabling the CoO x particles with an average diameter of 6.8 nm to uniformly disperse, thus facilitating the formation of the optimized CoO x /CN-400 composite. Benefiting from the unique morphology and composition, CoO x /CN-400 exhibited improved redox property and exceptional activity for the reduction of nitrophenol to form the corresponding aminophenol compounds. The complete conversion of 4-nitrophenol over CoO x /CN-400 requires only 35 min with a rate constant of 0.12 min −1 , which is significantly higher than that of most non-noble metal catalysts and approaching some of the noble metal-based catalysts. Furthermore, leveraging the embedded CoO x particles, CoO x /CN-400 maintains its high catalytic efficiency even after six successive cycles, demonstrates an outstanding long-term catalytic capability and reusability. Finally, the mechanisms of 4-NP reduction have been hypothesized based on the combination of characterization and DTF calculations.
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JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 20
·4032-4040
·
IF 2.557
Qingxiang Zhou,Yongyong Yuan,Yalin Wu,Yongli Liu
A novel magnetic core–shell material polyaniline@SiO 2 @Fe (PANI@SiO 2 @Fe) has been successfully synthesized and investigated as an effective adsorbent for the magnetic solid-phase extraction of typical endocrine disrupting compounds such as bisphenol A, tetrabromobisphenol A, and 4-nonylphenol from water samples. The morphology of the as-prepared PANI@SiO 2 @Fe was characterized by transmission electron microscopy and X-ray diffraction. The main parameters that influenced the enrichment performance such as the kind of eluent, amount of adsorbent, volume of eluent, adsorption time, elution time, ionic strength, pH, concentration of humic acid, and sample volume were investigated. Under the optimal conditions, a good linear relationship was found in the range of 0.05–100 μg/L for bisphenol A, 0.05–300 μg/L for tetrabromobisphenol A, and 0.05–250 μg/L for 4-nonylphenol, respectively. The correlation coefficients are all above 0.995. The limits of detection were in the range of 0.009–0.04 μg/L, and precisions were under 3.73% ( n = 6). The real water analysis indicated that the spiked recoveries were in the range of 92.9–98.9% ( n = 3). All these results indicated that the developed method was an efficient tool for the analysis of bisphenol A, tetrabromobisphenol A, and 4-nonylphenol.
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CHEMOSPHERE
·
2024
·
IF 8.1
Chaoyue Ge,Xinyu Luo,Yujie Lv,Lianchi Wu,Zhaoying Hu,Weichen Huang,Shenao Zhan,Xinyu Shen,Cai Hui,Dongyou Yu,Bing Liu
Nonylphenol (NP) is a ubiquitous endocrine disruptor that persists in the environment and can significantly contribute to serious health hazards, particularly intestinal barrier injury. Plant essential oils (EOs) have recently gained widespread interest due to their potential for improving intestinal health. However, the precise mechanism and protective effects of EOs ameliorating the intestinal damages induced by NP exposure remain unclear. To clarify the potential mechanism and protective impact of EOs against intestinal injury induced by NP, a total of 144 one-day-old male ducks were randomly allocated to four groups: CON (basal diet), EO (basal diet + 200 mg/kg EOs), NP (basal diet + 40 mg/kg NP), and NPEO (basal diet + 200 mg/kg EOs + 40 mg/kg NP). The data revealed that NP exposure significantly damaged intestinal barrier, as evidenced by a reduction in the levels of tight junction gene expression and an increase in intestinal permeability. Additionally, it disturbed gut microbiota, as well as interfered with tryptophan (Trp) metabolism. The NP-induced disorder of Trp metabolism restrained the activation of aryl hydrocarbon receptor (AhR) and resulted in decreased the expression levels of CYP1A1 , IL-22 , and STAT3 genes, which were alleviated after treatment with EOs. Taken together, NP exposure resulted in impairment of the intestinal barrier function, disruption of gut microbiota, and disturbances in Trp metabolism. Dietary EOs supplementation alleviated the intestinal barrier injury induced by NP through the Trp/AhR/IL-22 signaling pathway.
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PHYSICS LETTERS A
·
2024
·
IF 2.3
Ting-ting Yan,Yi-fei Xu,Dong-yang Xi,Zhi-qing Yu,Ran Jiang,Dan-dan Zhang
The study investigates the structural stability of the hydrogen-bonded energetic material 4-nitropyrazole (4-NP, C 3 H 3 N 3 O 2 ) from ambient pressure to 10 GPa at room temperature using diamond anvil cell (DAC) and Raman spectroscopy. Based on the changes observed in the high-pressure Raman spectra, it is proposed that the hydrogen-bonded energetic material 4-NP undergoes a phase transition within the pressure range of 2.7–6.4 GPa. Upon complete pressure release from 10 GPa, the resulting spectrum is consistent with the Raman spectrum observed under ambient pressure, indicating that the phase transition is reversible. Ab initio calculations were used to explain the changes in molecular arrangements and hydrogen-bonded networks. Hirshfeld surfaces and fingerprint plots were used to directly compare the variations in packing patterns and intermolecular interactions. Based on the experimental and calculated results, it is proposed that the phase transition of 4-NP was likely caused by the rearrangements of the hydrogen-bonded networks.
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ChemistrySelect
·
2024
·Vol. 9
·期 41
·e202402898
·
IF 1.9
Yuxian Wang,Pengfei Bai,Xian Sheng,Molan Qing,Yuanyang Yi,Zhidong Zhang,Ling Jiang,Liying Zhu
Graphical This study reports an environmentally friendly approach for the extracellular synthesis of Pd−Ag bimetallic nanoparticles (Pd−Ag BNPs) with small size by reduction of Pd and Ag ions using cell-free supernatant of Deinococcus wulumuqiensis . The application of as-prepared bionanocatalyst in catalytic degradation of pollutant dyes demonstrates that Pd−Ag BNPs have excellent degradation ability of 4-nitrophenol and Rhodamine. Catalytic reduction of organic pollutants using metal nanoparticles (MNPs) as nanocatalyst is a promising approach. The widespread application of MNPs have led to an increase demand for their production. The green biosynthesis of MNPs using microbes is becoming increasingly important as they are benign and environmentally friendly. In this work, Deinococcus wulumuqiensis ( D. wulumuqiensis ) with high resistance to stresses was applied for the green preparation of different MNPs, including palladium nanoparticles (Pd NPs), silver nanoparticles (Ag NPs), and Pd−Ag bimetallic nanoparticles (Pd−Ag BNPs). The resultant MNPs exhibited a face-centered cubic structure, with average size of 6.70 (Pd NPs), 6.24 (Ag NPs), and 6.13 nm (Pd−Ag BNPs), respectively. FT-IR spectra indicated that the proteins and polysaccharides expressed by D. wulumuqiensis could potentially contributed to the formation of MNPs. The application of as-prepared biocatalyst in catalytic degradation of pollutant dyes demonstrated that Pd−Ag BNPs had greater degradation ability of 4-nitrophenol (95.1 %) and Rhodamine B (85.1 %) than monometallic nanoparticles. The pseudo-first-order kinetics results further indicated the superior catalytic ability of Pd−Ag BNPs, with rate constant of 0.450±0.009 (4-nitrophenol) and 1.54×10 −2 min −1 (Rhodamine B), respectively. Thus, the present study confirms that D. wulumuqiensis represents a promising candidate for the biosynthesis of Pd-based nanoparticles with small size, which exhibited potential applications as bionanocatalyst in the degradation of water pollutants.
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