JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yue Sun,Minting Zou,Changyi Li,Xiaoran Li,Taoyan Mao,Cheng Zheng
Due to the benign features of biosurfactants such as their low toxicity and desirable biodegradability, there has been growing interest in developing these materials for environmental remediation applications. In this work, the relationship between the temperature and the solubilization of tea saponin was investigated via critical micelle concentration (CMC), particle size, and thermodynamics measurements. In addition, the aqueous solubility enhancements of naphthalene provided by micellar solutions of biosurfactants (tea saponin) and a synthetic surfactant (Tween 80) were measured and compared. Results indicated that the solubilization effect of tea saponin increased as the temperature was elevated from 298 to 313 K, which thus indicated that this effect had a strong dependence on temperature. An increase in the temperature also led to a lower CMC value, an increase of the particle diameter, and an enhancement of the molecular activity, which thus led to the enhanced solubilization effect of tea saponin. Moreover, the solubilization effect of tea saponin was better than that provided by Tween 80. The results confirmed the potential applicability of tea saponin for enhanced remediation of naphthalene.
研究领域:
环境科学
·
生物化学
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DOI
高影响因子
Lubricants
·
2023
·Vol. 11
·期 4
·156
·
IF 3.5
Yuanyuan Li,Chen Chen,Qiong Tang,Lei Liu,Jinxiang Dong
Alkylnaphthalene as base oils are widely applied in the production of high-performance lubricating oils. Here, we report the synthesis of multi-butylnaphthalenes by alkylation of naphthalene andn-butene with trifluoromethanesulfonic acid as catalyst. Trifluoromethanesulfonic acid exhibited excellent catalytic performance with naphthalene conversion, as high as 98.5%, and the multi-butylnaphthalenes selectivity of 98.8% under optimum conditions. To investigate the effects of the side-chain numbers on naphthalene on the lubrication performance, two kinds of alkylnaphthalenes were obtained by controlling catalyst dosage, denoted as MBN-1 (90.3% mono/di-butylnaphthalenes) and MBN-2 (98.2% tri/tetra/penta/hexa-butylnaphthalenes), respectively. The primary physiochemical properties of the synthetic oils were tested, and their tribological performance was evaluated. MBN-2, with more side chains on naphthalene, displayed more effective friction reduction and anti-wear properties than MBN-1 and the commercial alkyl naphthalene base oil AN5.Keywords:naphthalene;trifluoromethanesulfonic acid;alkylation;synthetic lubricating base oil
研究领域:
化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Yong-Sheng Xu,Xin Liu,Kang-Kang Pei,Rui-Xiong Zhao,Guo-Liang Zhang,Qing Xia,Feng-Bao Zhang
The solubilities of naphthalene in decalin, octane, dodecane, dichloromethane, trichloromethane, carbon tetrachloride, 1,2-dichloroethane, o-dichlorobenzene, 1-octanol, 2-octanone, 4-methyl-2-pentanone, and benzene were measured by a dynamic method over the temperature range of 279 to 330 K at atmospheric pressure. By comparison, the experimental results indicated that the molality solubility in dichloromethane reached maximum at certain temperature. Then, the Apelblat equation, the λh equation, the Wilson equation, and the nonrandom two liquid (NRTL) equation were used to correlate the experimental data. The NRTL equation was regarded as the effective model for all the solvents. Finally, the mixing properties were also calculated based on the NRTL equation. All these data were particularly instructive for the process of recycling naphthalene.
研究领域:
物理化学
·
化工过程
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 11
·2708
·
IF 4.2
Yunteng Chen,Chunxian Hong,Qiang Xu,Haihong Zheng,Chao Wang,Hongshun Lu,Shuai Zhang,Mingming Du,Ganning Zeng
In this study, carbon-quantum-dot (CQD)-decorated TiO2was prepared using an ultrasonic doping method and applied in the photocatalytic degradation of naphthalene under sunlight irradiation. The CQDs were synthesized from a typical macroalgae via diluted sulfuric acid pretreatment and hydrothermal synthesis using an optimal design, i.e., 3 wt% and 200 °C, respectively. The CQD/TiO2composite remarkably enhanced the photocatalytic activity. The degradation of naphthalene under a visible light environment indicated that there is a synergistic mechanism between the CQDs and TiO2, in which the generation of reactive oxygen species is significantly triggered; in addition, the N that originated from the macroalgae accelerated the photocatalytic efficiency. Kinetic analysis showed that the photocatalytic behavior of the CQD/TiO2composite followed a pseudo-first-order equation. Consequently, our combined experimental approach not only provides a facile pretreatment process for bio-CQDs synthesis, but also delivers a suitable TiO2photocatalyst for the visible environment along with critical insights into the development of harmful macroalgae resources.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Qingxiang Zhou,Man Lei,Jing Li,Kuifu Zhao,Yongli Liu
Magnetic Fe@MgAl-layered double hydroxides (MgAl-LDHs) composite was firstly synthesized by coating MgAl-layered double hydroxides on the surface of the dispersed nanoscale zero valent irons with co-precipitation method and characterized by transmission electron microscopy and X-ray diffraction techniques. The synthesized Fe@MgAl-LDHs nanoparticles were investigated for magnetic solid phase extraction (MSPE) of 1-naphthol and 2-naphthol from the water samples. The elutent containing 1-naphthol and 2-naphthol was analyzed by high performance liquid chromatography with variable wavelength detection (HPLC–UV). Under optimal conditions, there is good linear relationship between the concentration and the peak area in the range of 0.5–200 μg L −1 with the correlation coefficients ( r 2 ) above 0.998 for 1-naphthol and 2-naphthol. The limits of detection were 0.22 μg L −1 and 0.19 μg L −1 for 1-naphthol and 2-naphthol, respectively, and precisions were both below 2.5% ( n = 6). The real water analysis demonstrated that the spiked recoveries were in the range of 79.2–80.9% ( n = 3). All these results indicated that the developed MSPE–HPLC–UV method was proved to be an efficient tool for the analysis of naphthols.
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
·
IF 4.321
Jun Wang,Baoliang Chen
The adsorption and coadsorption of naphthalene, 1-naphthol and Cd 2+ onto graphene oxide (GO), chemically reduced graphene (CRG) and annealing reduced graphene (ARG) were compared to determine the unique adsorption properties of graphene nanosheets. The adsorption capability of organic pollutants followed the order CRG > ARG > GO, and all three adsorbents showed stronger adsorption to 1-naphthol than to naphthalene. In addition to a π–π interaction, the strong adsorption of 1-naphthol onto graphene nanosheets was mainly attributed to the n –π electron-donor–acceptor (EDA) interactions between the –OH groups of 1-naphthol and the electron-depleted sites on graphene nanosheets. The adsorption of 1-naphthol on reduced graphene materials increased with increasing pH and reached a maximum around its pKa, supporting the n –π EDA interaction mechanism. GO with more functional groups on the nanosheets over CRG and ARG exhibited a strong affinity with Cd 2+ . The adsorption of Cd 2+ onto GO and CRG facilitated the coadsorption of naphthalene and 1-naphthol via surface-bridging mechanisms, such as cation–π interactions. Notably, though ARG showed no significant Cd 2+ adsorption, the suppressed coadsorption of naphthalene onto ARG may be attributed to the sieving effect by hydrated Cd 2+ binding to the micropore edges on ARG.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Chen Chen,Qiong Tang,Hong Xu,Lei Liu,Mingxing Tang,Xuekuan Li,Jinxiang Dong
With the development of coal chemical industry, large amounts of naphthalene and n -butene are produced, and converting them into high value-added products through alkylation has gained particular importance and interest. In this work, liquid coordination complexes (LCCs) were used as acid catalysts for the first time in the naphthalene alkylation reaction under mild conditions to obtain multi-butylnaphthalenes with high yield. Various reaction conditions were thoroughly investigated. The LCC consisting of urea and AlCl 3 showed excellent catalytic performance under optimal reaction conditions, giving 100% conversion of naphthalene and 99.66% selectivity towards multi-butylnaphthalenes. Combining the catalyst properties and catalytic results, a plausible reaction mechanism was proposed. The lubricating properties of the synthesized products were investigated for their potential application as lubricating base oils. The synthesized multi-butylnaphthalenes showed comparable physicochemical properties and tribological performances as the commercial cycloalkyl base oil.
研究领域:
化学工程
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催化科学
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材料科学
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产品关联
DOI
高影响因子
Energies
·
2020
·Vol. 13
·期 23
·6202
·
IF 2.702
Xuyan Song,Min Wei,Qiang Gao,Xi Pan,Junpeng Yang,Fan Wu,Hongyun Hu
The condensation-collection and quantitative analysis of bio-oil limit its component investigation and utilization. In order to find a convenient method for the analysis of bio-oil, the present study conducted an attempt for bio-oil quantitative analysis with the addition of internal standards before pyrolysis. Based on their good thermal stability, phenethyl acetate and naphthalene were selected as standards in the study and experiments were carried out to compare the effects of two added modes (adding into the biowaste before pyrolysis or adding into bio-oil after pyrolysis) on the bio-oil analysis. The results showed that both phenethyl acetate and naphthalene were mainly volatilized under testing conditions, which could be transferred into the oil with the volatile matters during biowaste pyrolysis. Through the co-pyrolysis experiments of the internal standards with lignin and cellulose, almost no interactions were found between the internal standards and such components. Furthermore, adding these standards before pyrolysis hardly affected the properties of noncondensable gas and biochar from the used biowaste samples (tobacco and sawdust waste). Compared with the bio-oil analysis results via traditional methods by adding standards into the bio-oil after pyrolysis, the results regarding the component distribution characteristics of the bio-oil were similar using the proposed method through the addition of standards before pyrolysis. Considering adequate mixing of the added standards (before pyrolysis) in the generated bio-oil, the proposed method could partly help to avoid inaccurate analysis of bio-oil components caused by incomplete collection of the pyrolytic volatiles.Keywords:biowaste;pyrolysis;bio-oil quantitative analysis;phenethyl acetate;naphthalene
研究领域:
能源与环境科学
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化学工程
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产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Qiuxiang Yao,Lei He,Duo Ma,Yong Zhang,Dan Zhang,Ming Sun
The naphthalene derivatives in coal tar naphthalene and anthracene oil fractions mostly contain short-chain alkyl groups. The enrichment of PAHs (polycyclic aromatic hydrocarbons, mainly including naphthalene, anthracene, and pyrene) by the dealkylation of PAHs-rich fraction in coal tar was assumed to obtain high-purity PAHs by distillation. Based on this strategy, using 2-methylnaphthalene as the model compound, and the influences of catalysts with different supports (SiO 2 , Al 2 O 3 , ZSM-5, Beta, and HY) and different active metal components (Ni, Co, Mo, and W) prepared by the equivalent-volume impregnation method on the hydro-dealkylation performance of 2-methylnaphthalene under different technological conditions (temperature, H 2 initial pressure and reaction time) were systematically investigated in a pressurized batch reactor. The experimental results show that the conversion rate of 2-methylnaphthalene is 81.23 % and the selectivity of naphthalene is 64.22 % under conditions of 480 °C, 2 MPa, 4 h, and 6 W-HY. Loading 0.8 wt% La on the 6 W-HY catalyst can improve the dispersion of active metal component W on the support, but it does not change the skeleton structure of the support. In addition, one-dimensional diffusion is the most probable reaction mechanism for 2-methylnaphthalene, and the evolution profiles of naphthalene can be reflected by the reaction mechanism with a reaction order of n = 4 using the model fitting method.
研究领域:
化学工程
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催化
·
石油化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiaojiao Liu,Huifang Zhang,Ningyue Lu,Xiaoliang Yan,Binbin Fan,Ruifeng Li
A series of mesoporous ZSM-5-x (x = Si/Al molar ratio) supports, possessing various Si/Al ratios, were prepared without using the secondary templates, and the influences of acidity of ZSM-5-x on catalytic performance of Pt/HZSM-5-x samples prepared by the conventional wetness impregnation in naphthalene hydrogenation were investigated. The results show that decreasing Si/Al ratios of mesoporous ZSM-5 supports promotes the dispersion of the supported Pt species, and the catalytic efficiencies of Pt/HZSM-5-x samples for naphthalene hydrogenation depend on the integrated effects of the Pt dispersion, the acidity, and the mesoporous structure of ZSM-5 supports. This work provides the detailed influences of acidity of mesoporous ZSM-5 on catalytic performance of supported Pt catalysts in naphthalene hydrogenation.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
JOM
·
2024
·
IF 2.1
Yu Shi,Pan Hong,Ju Jianbin,Xia Guangping,Huang Yipeng,Ruan Guihua,Jiang Fuyang
In this study, carbon spheres decorated with nickel nanoparticles (ACS@Ni NPs) were prepared through arginine-assisted hydrothermal treatment, followed by high-temperature carbonization in a nitrogen atmosphere. ACS@Ni NPs displayed uniform size and excellent monodispersity. The specific surface area increased from 9.03 m 2 /g to 428.69 m 2 /g after carbonization. The ACS@Ni NPs were employed as adsorbents in dispersive magnetic solid phase extraction (d-MSPE) to extract methylnaphthalene and acenaphthene. The adsorption capacities of ACS@Ni NPs for methylnaphthalene and acenaphthene were 1592.75 μg g −1 and 1652.83 μg g −1 , respectively. In addition, ACS@Ni NPs sustained adsorption efficiencies > 90% even after ten reuse times. Coupled with high-performance liquid chromatography-ultraviolet detection technology, under the optimum experimental conditions, the detection limits of methylnaphthalene and acenaphthene were 0.58 and 0.12 ng mL −1 . The recoveries of methylnaphthalene and acenaphthene in all samples remained > 95%, with relative standard deviations < 4.5%. The results indicated that ACS@Ni NPs could be applied in environmental pollution treatment and sample preparation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2022
·
IF 4
Afzal Ali,Tahir Raza,Adeel Ahmed,Muhammad Safdar Ali,Changbao Liu,Dong Li,Chunhu Li
The intentional discharge of polycyclic aromatic hydrocarbons (PAHs) into the aquatic system from different industrial units has posed a serious threat to human health. To address the concerns associated with PAHs misuse, an efficient approach for developing affordable photocatalyst materials for PAHs degradation is much needed. In this study, we have explored co-precipitation and hydrothermal methods to synthesize Fe 3 O 4 /GO/g-C 3 N 4 ternary composites and utilized them as photocatalyst materials for the degradation of naphthalene. Fe 3 O 4 /GO/g-C 3 N 4 nanocomposite demonstrated superior degradation performance, with 87.56% naphthalene degradation achieved in 140 min under visible light irradiation, far outperforming Fe 3 O 4 /GO (77.42%) and Fe 3 O 4 (69.42%). The enhanced degradation of naphthalene by the Fe 3 O 4 /GO/g-C 3 N 4 composite was credited to the effective charge carrier separation and increased visible-light absorption induced by GO and g-C 3 N 4 . The impact of operating parameters on the catalytic efficiency of the Fe 3 O 4 /GO/g-C 3 N 4 catalyst was also examined. The findings of this study revealed that lower naphthalene concentration (10 mg/L), higher catalyst dosage (40 mg), and moderate pH conditions (pH 5 to pH 9) were favorable for photocatalytic activity. The degradation of naphthalene followed pseudo-first-order kinetics with a rate constant value of 0.0137 min −1 . The generation of radicals ( • OH and O 2 •− ) liable for the degradation of naphthalene was corroborated through electron paramagnetic resonance analysis and quenching experiments. Furthermore, the Fe 3 O 4 /GO/g-C 3 N 4 photocatalyst exhibited promising reusability in five consecutive cyclic runs, validating its excellent stability.
研究领域:
环境科学
·
材料科学
✓ 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）