JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Dan Chen,Huining Zhang,Kai Yang,Hongyu Wang
In this work, 4-aminothiophenol and 3-aminopropyltriethoxysilane were firstly used to functionalize graphene oxide (GO) in order to promote the sorption efficiencies of methylene blue (MB) and copper (Cu 2+ ). Characterization experiments illustrated that sulfydryl group ( SH) and amino group ( NH 2 ) were existed onto 4-aminothiophenol modified GO (GO-SH) and 3-aminopropyltriethoxysilane modified GO (GO-N), respectively. Adsorption isotherm results showed that the maximum adsorption capacities of MB by GO-SH and GO-N were 763.30 and 676.22 mg/g, which was much higher than original GO 455.95 mg/g. For Cu 2+ adsorption, the maximum adsorption capacities by GO-SH and GO-N were 99.17 and 103.28 mg/g, suggesting that the engineered GO exhibited greater Cu 2+ sorption ability than original GO 32.91 mg/g. Both MB and Cu 2+ removal rates increased with pH and adsorbent dosage increased, while the sorption rates weakly reduced with increasing ionic strength. The modification by SH and NH 2 would not only increase the sorption sites, but also cause chelation with heavy metals, and thus improving the sorption capacities of MB and Cu 2+ .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Xian-Fei Huang,Guang-Ping Yuan,Guan Huang,Su-Juan Wei
Aiming at the most enhancing the catalytic performance of simple and cheap cobalt(II) 5,10,15,20-tetrakis(4-pyridyl)porphyrin (Co TPyP), guided by the nowadays-advanced various technologies, Co TPyP was anchored onto nanoporous bar with thiol-functionalized silica (npb-SiO 2 -SH). The resulting npb-SiO 2 -S-Co TPyP catalyst was characterized using various techniques, determining its structure. The total surface area ratios (TSAR) of the immobilized cobalt porphyrin to the npb-SiO 2 -SH, and the catalytic cyclohexane oxidation reaction conditions were at the same time optimized via Response Surface Methodology (RSM). Compared with those obtained from traditional optimizing method (TOM), on average, RSM could enhance as high as more than 60% catalyst turnover frequency (TOF) and yields of cyclohexanone and cyclohexanol (KA oil). The anchored 0.05 mg Co TPyP could catalyze the oxidation of 200 mL of cyclohexane, under not using any solvents and additives, offering 2.5 × 10 6 1/h of TOF, and 19% of yields. The npb-SiO 2 -S (20%-0.0438)-Co TPyP catalyst showed better reusability, excellent catalytic
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2023
·Vol. 35
·期 9
·e202300064
·
IF 3
Jinjin Zhang,Wenjing Liu,Qi Wang,Jianying Qu
In this work, two-dimensional cobalt metal organic framework nanosheets ( CoTP ) were prepared by the simple hydrothermal reaction of cobalt nitrate hexahydrate with terephthalic acid, and then calcined at a high temperature under the environment of nitrogen to obtain cobalt carbon nanomaterials ( Co-CNs ). The gold nanomaterials ( AuNPs ) were prepared by redox reaction. The prepared materials were characterized and analyzed by XRD, SEM and IR. A novel electrochemical sensor ( AuNPs/Co-CNs ) was constructed successfully on a glassy carbon electrode combining Co-CNs with AuNPs , which showed significant electrocatalytic activities for acetaminophen ( PA ) and 4-aminophenol ( 4-AP ) and could be used to detect them simultaneously. Under the optimal conditions, the linear ranges for determination of PA and 4-AP were 0.50–250.00 μM and 0.50–350.00 μM with the detection limits of 0.11 μM and 0.10 μM, respectively. Compared with other related reports, the proposed sensor exhibits a wider linear ranges, good sensitivity, accuracy and selectivity with potential applications in real sample analysis.
研究领域:
分析化学
·
材料科学
·
医学检测
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Youning Chen,Min Wang,Shuang Jia,Yuhong Li,Xiaohua Meng,Xiaoling Yang
ABSTRACT A novel poly(4-styrene sulfonic acid)-graft resin (PSS-g-PS) with high adsorption capacity was prepared by grafting poly(4-styrene sulfonic acid) (PSS) onto chloromethylated styrene resin via surface-initiated atom transfer radical polymerization. The surface composition of the poly(4-styrene sulfonic acid)-grafted resin were characterized by Fourier-transform infrared spectrometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. It was found that the grafting amount of 4-styrenesulfonic acid increased linearly with the polymerization time. Effect of parameters such as pH, initial concentration and temperature on the removal of heavy metal ions was studied. The maximum adsorption capacities of the resin were up to 275 mg·g –1 for Pb(II), 169 mg·g –1 for Cu(II), 115 mg·g –1 for Cd(II), 90.8 mg·g –1 for Cr(III) and 75 mg·g –1 for Ni(II) at pH 5.0. The adsorption isotherms of the five metal ions were best described by the Langmuir model, and their adsorption kinetics followed the pseudo-second-order kinetic equation. Thermodynamic studies showed that the adsorption was spontaneous. Furthermore, the resins still maintained good adsorption capacity after 10 cycles of adsorption–regeneration. All the results suggested that the resin could be potentially applied to the efficient removal of heavy metal ions from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER JOURNAL
·
2019
·Vol. 52
·期 1
·145-152
·
IF 2.639
Bai Hongyuan,Han Li,Ma Hongwei,Yang Lincan,Li Chao,Liu Pibo,Shen Heyu,Lei Lan,Zhang Songbo
A sulfur-containing styrene derivative, 4-methylenethiochromane (META), was subjected to anionic copolymerization with isoprene (Ip) modified with different additives. The reactivity of META can be effectively regulated with additives; thus, gradient and alternating copolymers were prepared in a facile manner. When THF and TMEDA were utilized in the copolymerization, the reactivity was better than that observed without additives, and thus, gradient copolymers with different gradient extents can be synthesized. In addition, metal alkoxides (such as sodium 2,3-dimethylpentan-3-olate (NaODP) and potassium tert -butoxide ( t -BuOK)) were better able to regulate the reactivity, and the copolymers exhibited alternating and nearly alternating sequences. Therefore, the regulation of the alternating or gradient copolymerization of META and Ip was facilely realized through the use of additives.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Pengyue Sun,Diya Yang,Jing Li,Yaodong Zhang
In this work, 4-formyl-3-hydroxybenzoic acid (FHBA), which does not contain a large conjugated ring structure, exhibited aggregation-induced emission (AIE) in aqueous solvents. On this basis, FHBA and a metal-organic framework material (i.e., ZIF-8) form into a complex (FHBA@ZIF-8), which presents the AIE characteristics of FHBA. Then, lanthanide metal (i.e., Eu 3+ ) coordinates with guanosine 5′-monophosphate disodium (GMP) salt to synthesize a coordination polymer (LnCP), which combines with FHBA@ZIF-8 do afford a novel double-emitting fluorescence probe (FHBA@ZIF-8@Eu-GMP, FZE) for tetracycline antibiotics (TCAs). TCAs coordinate with Eu 3+ and act as antenna ligand. Thus, an “antenna effect” comes into being and effectively enhances the emission intensity of Eu 3+ at 616 nm. Moreover, the UV–vis spectra of TCAs largely overlap with the excitation spectrum of FHBA, resulting in an inner filter effect (IFE) and quenching of blue-green fluorescence from FHBA molecules at 473 nm. The ratio of fluorescence signal (F 616 /F 473 ) showed a good linear relationship with the concentration of tetracycline hydrochloride (TC) in the range of 0.1–200.0 μM, and the detection limit was 60 nM (S/N = 3). This fluorescence probe can also effectively respond to oxytetracycline hydrochloride (OTC) and chlortetracycline hydrochloride (CTC). The probe was applied to determine TC in milk, and the recoveries ranged from 94.0% to 101.4%, indicating the application potential of this method. This study provides a novel idea for the construction of ratiometric fluorescence sensing platforms and shows the application potential of the AIE effect of FHBA.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2017
·Vol. 63
·期 8
·3395-3403
·
IF 2.836
Min Xiao,Ding Cui,Helei Liu,Paitoon Tontiwachwuthikul,Zhiwu Liang
In this work, the equilibrium CO 2 solubility in the aqueous tertiary amine, N-methyl-4-piperidinol (MPDL) was measured over a range of temperatures, CO 2 partial pressures and amine concentrations. The dissociation constant of the MPDL solution was determined as well. A new thermodynamic model was developed to predict the equilibrium CO 2 solubility in the MPDL-H 2 O-CO 2 system. This model, equipped with the correction factor (C f ), can give reasonable prediction with an average absolute deviation of 2.0%, and performs better than other models (i.e., KE model, Li-Shen model, and Hu-Chakma). The second-order reaction rate constant (k 2 ) of MPDL and the heat of CO 2 absorption (–ΔH abs ) into aqueous MPDL solutions were evaluated as well. Based on the comparison with some conventional amines, MPDL revealed a high-equilibrium CO 2 loading, reasonably fast absorption rate when compared with other tertiary amines, and a low energy requirement for regeneration. It may, therefore, be considered to be an alternative solvent for CO 2 capture. © 2017 American Institute of Chemical Engineers AIChE J , 63: 3395–3403, 2017
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Hang Xu,Shaokang Wang,Fengmin Wu,Qinlin Yuan,Yafei Guo,Yinke Zhang,Xuefeng Wei,Jun Zhang
One of the disadvantages of using inorganic solid catalysts is the formation of solid waste. The use of fully-organic solid catalysts can reduce secondary pollution by simple combustion or bio-degradation. Here, an organic polymerization carrier, calix[4]resorcinarene, with polyhydroxyl characteristics, was synthesized. A cobalt containing ionic liquid was successfully chemically bonded to the hydroxyl groups on the carrier surface using 3-chloropropyltrimethoxysilane as linking agent. The resulting fully-organic supported ionic liquid catalyst was coupled with oxone for desulfurization. The micro-structure of the catalyst was composed of a porous spatial network structure. The reaction system exhibited excellent dibenzothiophene (DBT) removal (93.3%) after 90 min under the optimum experimental conditions (20 °C, 6 g of model oil with an initial sulfur content of 1000 ppm, 0.2 g of 20 wt% oxone solution with a dosage frequency of three, 15% of CoCl 2 , 0.15 g of catalyst, and 2 g of [Bmim]BF 4 ). After six regeneration cycles, the sulfur removal remained above 90%. The desulfurization kinetics and mechanism were also discussed, and it was found that the hyperbolic model provided a better fit to the experimental data compared to the pseudo first-order model. The likely mechanism involves DBT being extracted using the ionic liquid [Bmim]BF 4 before being oxidized by the catalyst/oxone system to form DBTO 2 , which is easily removed from the system using polar solvents.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Hongqiang Xu,Hailong Wang,Yixia Lu,Yanbo Zeng,Yiwen Yang,Zulei Zhang,Hongmei Wang,Xiao Wang,Lei Li
A rapid and simple fluorescence probe based on CeO 2 quantum dots (QDs) was developed for highly selective and ultrasensitive direct determination of 4-nitrophenol (4-NP). CeO 2 QDs were prepared using the sol-gel method with the precursor of Ce(NO 3 ) 3 ·6H 2 O as a cerium source. The products were characterized through high-resolution electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The fluorescent probe based on CeO 2 QDs exhibited a broad linear response to the concentration of 4-NP in the range of 0.005–75.00 μM and provided a low detection limit of 1.50 nM. The fluorescence of CeO 2 QDs was quenched by 4-NP through the fluorescence resonance energy transfer mechanism owing to the well overlaps between the fluorescence emission spectrum of CeO 2 QDs with the ultraviolet absorption spectrum of 4-NP. This result was confirmed by the time-resolved fluorescence spectra and the evaluation of the interaction distance between CeO 2 QDs and 4-NP. The prepared CeO 2 QDs are successfully applied to the determination of 4-NP in real water samples, where the spiked recoveries range from 98.2% to 102.4%.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·353
·
IF 3.504
Yue Chen,Yuanyuan Zhang,Qiangwei Kou,Yang Liu,Donglai Han,Dandan Wang,Yantao Sun,Yongjun Zhang,Yaxin Wang,Ziyang Lu,Lei Chen,Jinghai Yang,Scott Guozhong Xing
In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe3O4-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe3O4hollow microspheres and Fe3O4-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe3O4-Au magnetic nanocomposites. By adjusting the quantity of Au seeds coating on the polyethyleneimine-dithiocarbamates (PEI-DTC)-modified surfaces of Fe3O4hollow microspheres, the correlation between the amount of Au seeds and the catalytic ability of Fe3O4-Au magnetic nanocomposites for 4-nitrophenol (4-NP) is investigated systematically. Importantly, bearing remarkable recyclable features, our developed Fe3O4-Au magnetic nanocomposites can be readily separated with a magnet. Such Fe3O4-Au magnetic nanocomposites shine the light on highly efficient catalysts for 4-NP reduction at the mass production level.Keywords:Fe3O4hollow microspheres;Fe3O4-Au magnetic nanocomposites;catalytic reduction;4-nitrophenol
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2014
·Vol. 37
·期 22
·3268-3275
·
IF 2.594
Zhifen Deng,Junwei Liu,Chenchen Hu,Liu Yang,Huifang Du,Kai Hu,Yanjie Huang,Xiaoqing Yang,Qiong Jiang,Shusheng Zhang
Two new kinds of alanine-substituted calix[4]arene stationary phases of 5,11,17,23- p-tert- butyl-25,27-bis( l -alanine-methylester- N -carbonyl-methoxy)-26,28-dihyroxycalix[4]arene-bonded silica gel stationary phase (BABS4) and 5, 11, 17, 23- p-tert -butyl-25,26,27,28-tetra( l -alanine-methylester- N -carbonyl-methoxy)-calix[4]arene-bonded silica gel stationary phase (TABS4) were prepared and characterized in the present study. They were compared with each other and investigated in terms of their chromatographic performance by using polycyclic aromatic hydrocarbons, disubstituted benzene isomers, and mono-substituted benzenes as solute probes. The results indicated that both BABS4 and TABS4 exhibited multiple interactions with analytes. In addition, the commonly used Tanaka characterization protocol for the evaluation of commercially available stationary phases was applied to evaluate the properties of these two new functionalized calixarene stationary phases. The Tanaka test results were compared with Zorbax Eclipse XDB C 18 and Kromasil phenyl columns, respectively. BABS4 has stronger hydrogen-bonding capacity and ion-exchange capacity than TABS4, and features weaker hydrophobicity and hydrophobic selectivity. Both of them behave similarly in stereoselectivity. Both BABS4 and TABS4 are weaker than C 18 and phenyl stationary phases in hydrophobicity and hydrophobic selectivity.
研究领域:
分析化学
·
色谱学
✓ 已验证
DOI
高影响因子
Frontiers in Endocrinology
·
2025
·
IF 4.6
Emmanuel Osei Nkansah,Yunzhu Lan,Hui Zhang,Binbin Xu,Qiaodan Li,Mohammad Ishraq Zafar,Jian Xu
Background: Obesity is associated with hormonal imbalance, increased oxidative stress, and inflammation in the testis. These conditions adversely affect sperm quality, leading to impaired male fertility. Therefore, therapeutic interventions to counteract the adverse effects of obesity are crucial. This study explored the therapeutic effects of 4-hydroxyisoleucine (4-HIL) on fertility in male mice with diet-induced obesity.Methods: C57BL6 male mice (n=45) were randomly divided into normal diet (ND, n=15) and high-fat diet (HFD, n=30) groups for 10 weeks. The HFD group was then randomized into untreated (HFD, n=15) and 4-HIL-treated (200 mg/kg/day, intraperitoneal injection, HFD + 4-HIL group, n=15) for 6 weeks. ND and HFD controls received saline (0.3 mL/30 g body weight) throughout the intervention period. Comprehensive evaluations included (1) metabolic assessments (body weight, glucose, insulin and pyruvate tolerance tests, and blood serum lipids), (2) sperm analysis (count, concentration, and morphology), (3) fertility testing (mating trials and in vitro fertilization), (4) testicular histopathology (fat deposition and apoptosis), (5) biochemical assays (reproductive hormones, oxidative stress markers, and inflammatory cytokines), and (6) molecular analyses (mRNA sequencing and qPCR validation of differentially expressed genes).Results: 4-HIL treatment improved metabolic parameters, including reduced weight gain, enhanced glucose tolerance, and optimized blood serum lipids, compared to HFD controls. Treated mice exhibited superior sperm quality with increased count and concentration, reduced histomorphological abnormalities in the testis, and attenuated oxidative stress and inflammation. Furthermore, the key spermatogenic gene expressions, including spem1 and spata24, were significantly optimized in the testes of mice treated with 4-HIL compared to those of untreated mice (HFD group).Conclusion: This study demonstrates that 4-HIL therapy ameliorates obesity-induced testicular dysfunction and improves fertility markers in mice. The beneficial effects of this compound on metabolic parameters, sperm quality, and spermatogenic gene expression suggest its potential as a therapeutic agent for obesity-related male infertility. Further research is warranted to elucidate the underlying mechanisms and assess the clinical translatability of these findings.
研究领域:
内分泌学
·
生殖生物学
·
药理学
·
分子生物学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）