ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Jiaying Zhu,Yanyang Wu,Bin Wu,Kui Chen,Lijun Ji
m-Cresol and p-cresol are widely used in medicine and pesticides as important chemical intermediates. They are generally produced as a mixture in industry and are difficult to separate due to the similarities in both chemical structures and physical properties. The adsorption behaviours of m-cresol and p-cresol on zeolites (NaZSM-5 and HZSM-5) with different Si/Al ratios have been compared by static experiments. Selectivity on NaZSM-5(Si/Al = 80) could be greater than 6.0. Adsorption kinetics and isotherms were investigated in detail. The kinetic data was correlated by PFO, PSO, and ID models, the NRMSE of which were 14.03%, 9.41%, and 21.11%, respectively. In the meanwhile, according to the NRMSE of Langmuir (6.01%), Freundlich (57.80%), D-R (1.1%), and Temkin (0.56%) isotherms, adsorption on NaZSM-5(Si/Al = 80) was mainly a monolayer and chemical adsorption process. It was endothermic for m-cresol and exothermic for p-cresol. The Gibbs free energy, entropy, and enthalpy were calculated accordingly. The adsorption of cresol isomers on NaZSM-5(Si/Al = 80) were both spontaneous, and it was exothermic (ΔH = −37.11kJ/mol) for p-cresol while endothermic (ΔH = 52.30kJ/mol) for m-cresol. Additionally, ΔS were respectively −0.05 and 0.20 kJ·mol−1·K−1for p-cresol and m-cresol, which were both close to zero. The adsorption was mainly driven by enthalpy. The result of breakthrough further demonstrated m-cresol and p-cresol could be separated effectively by NaZSM-5(Si/Al = 80). Additionally, the selectivity increased from 7.53 to 14.72 after four cycles regeneration with 9.95% and 53.96% decreases in the adsorption amounts for m-cresol and p-cresol, respectively. In conclusion, NaZSM-5(Si/Al = 80) could be a feasible adsorbent for the separation of m-cresol and p-cresol.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22672-22685
·
IF 3.925
Jing Wang,Mei Zhang,Feng Li,Huan Wang,Yanguang Chen,Hua Song
To deeply understand the role of P in hydrodeoxygenation (HDO), SiO2-supported Ni and Ni–P catalysts with different P/Ni ratios (x) were prepared. The as-prepared samples were characterized by various characterization methods. The HDO activity and product distribution over the Ni/SiO2 and N–P/SiO2-x were compared and the effects of x on the structure, acidity, formation mechanism of active phases and HDO performance were studied taking m-cresol HDO as a model reaction. The results showed that the introduction of P promotes the formation of smaller active sites and contributes to the creation of weak and medium strength acid sites through the formation of P–OH groups and Niδ+ in Ni2P. HDO over the Ni/SiO2 catalyst occurs mainly via the hydrogenation (HYD) route with 3-methyl-cyclohexanol (3-MCHnol) as the main product. However, for Ni–P/SiO2-x catalysts, methyl-cyclohexane (MCH) selectivity increases first and then decreases with the increase of x, reaching a maximum of 95% at x = 1. The acidity generated by the introduction of P contributes to increased MCH selectivity, while the dehydration of 3-MCHnol to MCH occurs mainly on acid sites. However, the excessively high P content (x ≥ 2.0) leads to a significant increase of MB (toluene) selectivity, which is associated with the increase in Ni(I) sites. About 100% m-cresol conversion was achieved with Ni–P/SiO2-1.0 when the m-cresol (g)/catalyst (g) ratio was 3, with MCH (99.4%) as the major product, showing great promise for deep HDO catalysis.
研究领域:
催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2016
·Vol. 6
·期 2
·19
·
IF 2.964
Guozhu Liu,Yunxia Zhao,Jinhua Guo
High selectively catalytic conversion of lignin-based phenols (m-cresol,p-cresol, and guaiacol) intopara-/m-xylene was performed over Pt/HZSM-5 through hydrodeoxygenation andin situmethylation with methanol. It is found that thep-/m-xylene selectivity is uniformly higher than 21%, and even increase up to 33.5% form-cresol (with phenols/methanol molar ratio of 1/8). The improvedp-/m-xylene selectivity in presence of methanol is attributed to the combined reaction pathways: methylation ofm-cresol into xylenols followed by HDO intop-/m-xylene, and HDO ofm-cresol into toluene followed by methylation intop-/m-xylene. Comparison of the product distribution over a series of catalysts indicates that both metals and supporters have distinct effect on thep-/m-xylene selectivity.Keywords:m-cresol;hydrodeoxygenation;methanol;p-/m-xylene;methylation
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2025
·
IF 2.3
Caidi Zhang,Wanchuan Shang,Xiaoning Zhang,Xueli Huang,Xueying Wang
Cresol is an important phenolic compound derived primarily from low-temperature coal tar. The presence of m/p-cresol increases the unsaturated bonds in coal tar. This increases the hydrogen consumption in the hydrogenation process. Separation and further purification of m/p-cresol can improve the value of coal tar. The boiling points of m-cresol and p-cresol are similar and therefore difficult to separate. It has become a major problem in the development of crude phenol refining. In this work, a novel complexing agent, hexamethylenetetramine, was used to complex and separate cresols. The effects of crystallization temperature, complexing agent dosage, solvent dosage and crystallization time were investigated. The process was optimized using response the surface methodology. As a result, the purity of m-cresol could reach more than 94.2% and the yield reached more than 30.4%, indicating that the process could effectively separate the mixture of m-cresol and p-cresol.
研究领域:
化学工程
·
煤化工
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产品关联
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2023
·
IF 4.8
Ni-Hong Yao,Xi Liu,Chenyang Luo,Lei Zou,Jinhua Li,Jing Chen,Dazhong Yan,Hong-Jun Chao
The compound m -cresol ( meta -cresol) is an important representative of alkylphenol pollutants with high toxicity and potential carcinogenicity . The genes and enzymes associated with the m -cresol pathway have not yet been well elucidated. In this study, Comamonas thiooxydans CHJ601 was isolated from industrial wastewater and cultured utilizing m -cresol as the sole source of carbon and energy. m -Cresol catabolism begins with the oxidation of its methyl group in strain CHJ601. Genome sequencing and heterologous expression of key genes revealed its detailed catabolic pathway. m -Cresol methylhydroxylase (MchAB) catalyzed o -cresol ( ortho -cresol), m -cresol, and p -cresol ( para -cresol) in the presence of NADH and FAD. The K m value of m -cresol (48.74 ± 5.02 μM) for MchAB was much lower than that of o -cresol (747.80 ± 53.34 μM) and p -cresol (541.90 ± 41.43 μM). Molecular docking analysis showed that the binding affinities of MchAB against m -cresol with two hydrogen bonds are higher than p -cresol methylhydroxylase with one. The optimal substrate of MchAB was m -cresol, which can be catalyzed into 3-hydroxybenzyl alcohol and then oxidized to 3-hydroxybenzaldehyde. The mchC gene encoded 3-hydroxybenzaldehyde dehydrogenase , which catalyzes the oxidation of 3-hydroxybenzaldehyde to 3-hydroxybenzoate. The results indicated that MchAB and MchC are the first characterized enzymes to catalyze the oxidation of the meta -methyl group of m -cresol in the strain CHJ601.
研究领域:
环境微生物学
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分子生物学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yilin Wu,Wendong Xing,Junzhi Yan,Jiuyun Cui,Faguang Ma,Jia Gao,Jian Lu,Chao Yu,Ming Yan
In spite of the intense efforts in selective separation field, the utilization and preparation of membrane-associated molecularly imprinted membranes with both enhanced rebinding capacities and high permselectivity performance still remain strong challenges. Herein, the bioinspired PDA-modified porous regenerated cellulose membrane (pRCMs) with mineral-coated multilevel structure was first proposed for the preparation of PDA/CaCO 3 -based imprinted nanocomposite membranes (PCIMs), m-cresol was chosen as the template molecule. Importantly, this bioinspired methodology was redeveloped and optimized to obtain abundant and uniformly distributed CaCO 3 nanocomposite on the surfaces of PDA@pRCMs. The as-designed sandwich-like imprinting structure were then constructed on PDA/CaCO 3 -based surfaces by developing a simple sol-gel imprinting process. Attributing to the design of the uniform CaCO 3 /PDA@pRCMs surfaces, amount of m-cresol-imprinted sites and permeation selectivity could be both optimized, it was no surprise that more excellent rebinding capacity (97.4 mg g −1 ), fast adsorption kinetics and high permselectivity coefficients (more than 13) were successfully achieved. Importantly, the whole synthesis process was conducted without complicated procedures and polluting the environment. Finally, the experimental results mentioned above, together with the green synthesis processes strongly demonstrated that our synthesis methodology of PCIMs had great potential for applications in various fields of selective separation, chemical industry, environment, biological medicine and so on.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 57
·46146-46157
·
IF 3.84
Yilin Wu,Jiuyun Cui,Minjia Meng,Ming Yan,Yongsheng Yan,Chunxiang Li
Nanocomposite membranes with specific recognition, durability and regeneration ability that can rapidly adsorb and separate target compounds have remarkable technological applications for areas ranging from solid-phase extraction devices to architecture. In this work, inspired by the highly bioadhesive performance of mussel protein, urgently desired molecularly imprinted nanocomposite membranes (MINCMs) were prepared by developing a simple “bio-glue” imprinted strategy. By simply immersing the “bio-glue” m-cresol-imprinted PDA@SiO2 into casting solution accompanied by persistently mechanically stirring, a highly bio-adhered and homo-dispersedly distributed structure could be generated into MINCMs during a phase inversion process, which directed the higher perm-selectivity and reusability. Additionally, due to the unique properties of PDA modified layers and SiO2 nanoparticles (high surface-to-volume ratio and large surface area), the as-prepared MINCMs not only exhibited rapid adsorption dynamics, but also possessed an excellent separation performance of template molecule (m-cresol in this work). The excellent separation (perm-selectivity factor is 3.477) and recognition behavior (imprinted factor is more than 3.0) along with the low preparation consumed and green, quick, facile synthesis conditions make the as-prepared MINCMs attractive in broad technological applications for areas ranging from drug delivery to bioseparation.
研究领域:
材料科学
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生物医学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Xinmin Liu,Yanjie Niu,Lingyun Wang,Qingjie Guo
Carbon nanotubes (CNTs) and graphene (Gr) modified carbon cloth (CC) cathode were prepared by in situ polymerization method using polyaniline (PANI) as an adhesive. Different modified electrodes were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), cyclic voltammetry (CV), and thermogravimetric analysis (TGA) techniques. These different cathodes were used in anaerobic fluidized bed microbial fuel cell (AFB-MFC) to treat the synthetic m-cresol wastewater. The results showed that the maximum power densities of AFB-MFC with the Gr-modified cathode (PANI + Pt/C + Gr), the CNT-modified cathode (PANI + Pt/C + CNTs), and the Pt/C cathode (PANI + Pt/C) were 910.40, 445.14, and 127.07 mW/m2, respectively. In addition, the removal efficiency of m-cresol in AFB-MFC with PANI + Pt/C + Gr is 91.76%, while the corresponding values in AFB-MFC with PANI + Pt/C + CNTs and PANI + Pt/C are 91.72 and 89.26%, respectively. Gas chromatography–mass spectrometer (GC–MS) was used to detect metabolites of m-cresol. It was proved that m-cresol was degraded to protocatechol and then to 2-dimethylsuccinic acid. The energy of m-cresol degradation pathway was analyzed by Materials Studio (MS) software, and the control step of m-cresol degradation was determined.
研究领域:
环境科学
·
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Liping Zhang,Huitong Li,Mengnan Duan,Weiwei Wang,Ran Mu,Zehua Pi,Yubin Shang
Coking reverse osmosis concentrates (ROCs) are characterized by a high organic content, complex composition, and difficulty in biological degradation. To achieve the zero liquid discharge (ZLD) strategy, ROCs need to be treated urgently. This work aims to prepare a modified catalyst under high-efficiency activated alumina (γ-Al 2 O 3 ) loaded with Fe and Co bimetals and to degrade m-cresol as a typical pollutant in actual coking ROCs. The results showed that Fe and Co metals were successfully loaded. Meanwhile, the catalyst enhances the reactive active sites, reduces the activation energy of the reaction, and improves the degradation efficiency. The degradation mechanism and removal process were investigated. The results showed that with the optimal conditions, as ozone dosage of 50 mg/L, gas flow rate of 400 mL/min, catalyst dosage of 30 g/L, and pH value of 9, the removal rates of COD, TOC, and UV 254 were 75.61 %, 56.22 %, and 84.14 %, respectively. This study provides a better treatment option for the degradation of m-cresols in coking ROCs.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2017
·
IF 2.499
Mohammad Russel,Sun Zhenxiang,Liu Changrui,Zhou Hao,Liu Lifen,Sophocleous Marios,Zhou Yong
A microwave-based, rapid and non-destructive spectroscopic technique has been developed to monitor contamination in beach-sand. A set of in-vitro experiments were designed to test beach-sand samples contaminated with meta-cresol (m-cresol) and water with weight/weight percentages of 0–20%, using a prototype probe with a long sample holder (16 mm). The frequency range used was 10 MHz–1 GHz during the whole experiment. Air and Teflon were investigated as low-loss materials, whilst ethanol was used as a typical, frequency-dependent, polar material to further verify the technique. The real part of the relative complex permittivity was found to be very close to the theoretical and fitting very well with the Debye model. This dielectric technique showed a linear relationship between the real part of relative complex permittivity and m-cresol/water content, for a frequency range of 0.02–0.7 GHz for water and 0.02–0.2 GHz for m-cresol. The sensitivity was calculated to be 0.58% −1 and 0.12% −1 for water and m-cresol, respectively.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 1.9
Xudong Wang,Yanyang Wu,Tianyou Wang,Bin Wu,Kui Chen,Lijun Ji
M-cresol and p-cresol, typically produced as mixtures in industrial processes, are crucial chemical intermediates. However, their separation is challenging due to their similar structures and properties. ZSM-5 zeolite has shown potential as an adsorbent for separation, while the performance is yet to be improved. In this study, ZSM-5-F(x) was synthesized via hydrothermal method, incorporating F − ions during the synthesis process. The adsorption behaviour of m-cresol and p-cresol on ZSM-5-F(x) was investigated through static experiments, with ZSM-5-F(8) demonstrating the highest selectivity (9.01). Both ZSM-5-F(0) and ZSM-5-F(8) were characterized using XRD, scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) techniques. In addition, the introduction of F − ions increased the material's electronegativity, as demonstrated by the change in zeta potential from 53.22 to −45.93 mV. Single-component adsorption of m-cresol or p-cresol on ZSM-5-F(0) and ZSM-5-F(8) respectively were investigated in detail. The adsorption of m-cresol on ZSM-5-F(8) showed a non-monotonic phenomenon with a significant decrease after 0.06 mol/L. The thermodynamic parameters including Δ G , Δ H , and Δ S were calculated accordingly. All the values |Δ G |, |Δ H |, and |Δ S | of both components on ZSM-5-F(8) were greater than those on ZSM-5-F(0), suggesting that the introduction of F − ions facilitated the adsorption. Competitive adsorption experiments on both ZSM-5-F(0) and ZSM-5-F(8) were conducted at 298.2 K. The results indicated that the selectivity α p/m on ZSM-5-F(8) increased with increasing initial concentration and laid between 13 and 14. After seven consecutive regeneration cycles, the selectivity (α p/m ) only decreased to 13. This study suggests that ZSM-5-F(8) could be a promising adsorbent for m-cresol and p-cresol in industrial applications.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2019
·Vol. 34
·期 3
·e8576
·
IF 2.045
Jiaxiang Xu,Guohua Zhu,Huarong Zhang,Jinsong Liu,Kezhi Jiang
Rationale m -Cresol is listed as a priority controlled contaminant in many countries, but it is very difficult to accurately determine isomeric cresols due to their incomplete chromatographic separation on commercially available chromatographic columns and their nearly identical mass spectra. Methods Silylation of isomeric cresols was carried out by treatment with N -methyl- N -(trimethylsilyl)trifluoroacetamide. The formed trimethyl(tolyloxy)silanes were analyzed by gas chromatography/mass spectrometry (GC/MS). Theoretical calculations were carried out with the Gaussian 03 program using the density functional theory (DFT) method at the B3LYP/6-311 + G(2d,p) level. Results The derivatives of three isomeric cresols and six isomeric xylenols have been completely separated on an HP-5MS capillary column within a GC run of only 10 minutes. In addition, the derivative o -cresol can be very easily differentiated from its isomers due to its characteristic base peak ion at m / z 91 in electron ionization (EI)-MS. DFT calculation results indicated that the formation of the abundant fragment ion at m / z 91 is attributed to a facile dissociation pathway involving the shift of a neighboring phenylmethyl hydrogen atom in EI-MS of trimethyl( o -tolyloxy)silane. Conclusions Silylation provides a promising solution for simultaneous determination of isomeric cresols and isomeric xylenols.
研究领域:
分析化学
·
环境科学
✓ 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）