Minerals
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2024
·Vol. 14
·期 12
·1255
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IF 2.2
Chenglong Du,Jiang Yu,Guangyi Liu
Iron ore is the main raw material of the iron and steel metallurgy industry, but quartz in iron ore reduces metallurgical efficiency and increases metallurgical costs. Therefore, iron ore desiliconization by flotation plays an important role in the iron and steel metallurgy industry. In this study, 4-tert-butyl-catechol (TBC) was designed as a collector to directly float out hematite from quartz. The micro-flotation tests demonstrated that under pH ~9.0, 1 × 10−5mol·L−1TBC recovered 98% hematite from its mixture with quartz, while the recovery of quartz was only about 17%. Zeta potential and contact angle results inferred that the adsorption affinity of TBC toward hematite was greater than that to quartz. The results of FTIR and XPS inferred that TBC adsorbed on the Fe3+sites of hematite interfaced via the O atom of its two adjacent hydroxyl groups to form a stable five-membered chelating ring at pH 9.0. This study offered new research insight on the development of novel collectors for hematite flotation through bionics technology.
研究领域:
矿物加工工程
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材料科学与工程
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npj Materials Degradation
·
2023
·Vol. 7
·期 1
·1-7
·
IF 5.1
Song Yan,Kong Annan,Chen Dongxiang,Li Guo Liang
Autonomous self-healing anticorrosion protective coatings from intrinsic polymers is a great challenge. In this work, in-situ self-crosslinking strategy was demonstrated for constructing self-healing anticorrosion polymers. The as-synthesized polymers had tunable catechol content and mechanical properties. The specimens could be repaired in an Fe 3+ solution owing to the formation of dynamic catechol-Fe 3+ coordination crosslinking sites. Moreover, when scratched, the prepared polymers exhibited a self-healing anticorrosion performance, as evidenced by salt immersion and electrochemical impedance spectroscopy. An in-situ self-crosslinking mechanism was proposed, which was derived from the dynamic coordination of catechol groups in the polymer chains and Fe 3+ produced from the metal substrate. This intrinsic self-healing anticorrosion polymer are highly potential for anticorrosion applications in harsh environments.
研究领域:
材料科学
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化学工程
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 18
·52050
·
IF 3.125
Dexiang Yan,Fenghua Li,Bin Sun,Yuanbo Wang,Qinze Liu,Tingting Gao,Guowei Zhou
In this work, a new AC@Catechol/PEI adsorbent was prepared via the copolymerization of catechol and polyethyleneimine (PEI) onto pretreated commercial activated carbon (AC). It achieved a high adsorption capacity of 411.52 mg/g for the anionic dye Congo red (CR), which was approximately 7 times that of pretreated AC without modification. In bath adsorption experiment, 1 g of adsorbent was used to treat 4 L of 100 mg/L CR solution, resulting in 98.5% CR removal. In addition, the prepared AC@Catechol/PEI adsorbent exhibited highly efficient CR competitive adsorption against SO 4 2− ions and cationic malachite green dye. The adsorption mechanism was mainly attributed to electrostatic interactions, hydrogen bonding, and π – π stacking. Catecholamine modification greatly improved the adsorption capacity and adsorption selectivity of commercial AC for CR dyes. This low-cost adsorbent may have broad prospects for the removal of anionic dyes in wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
Foods
·
2025
·Vol. 14
·期 1
·133
·
IF 5.1
Chao Wang,Xiangchuan Wu,Xinhe Lin,Xueting Zhu,Wei Ma,Jian Chen
The use of nanozymes for electrochemical detection in the food industry is an intriguing area of research. In this study, we synthesized a laccase mimicking the MnO2@CeO2nanozyme using a simple hydrothermal method, which was characterized by modern analytical methods, such as transmission electron microscope (TEM), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDX), etc. We found that the addition of MnO2significantly increased the laccase-like activity by 300% compared to CeO2nanorods. Due to the excellent laccase-like activity of the MnO2@CeO2nanozyme, we developed an electrochemical sensor for the detection of hazardous phenolic compounds such as bisphenol A and catechol in red wines by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). We used the MnO2@CeO2nanozyme to develop an electrochemical sensor for detecting harmful phenolic compounds like bisphenol A and catechol in red wine due to its excellent laccase-like activity. The MnO2@CeO2nanorods could be dispersion-modified glassy carbon electrodes (GCEs) by polyethyleneimine (PEI) to achieve a rapid detection of bisphenol A and catechol, with limits of detection as low as 1.2 × 10−8M and 7.3 × 10−8M, respectively. This approach provides a new way to accurately determine phenolic compounds with high sensitivity, low cost, and stability.
研究领域:
食品科学
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生物化学
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分析化学
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DOI
PubMed
高影响因子
Research
·
2022
·
IF 11.036
Lei Zhou,Lu Zhang,Peichuang Li,Manfred F. Maitz,Kebing Wang,Tengda Shang,Sheng Dai,Yudie Fu,Yuancong Zhao,Zhilu Yang,Jin Wang,Xin Li
Many polyurethanes (PUs) are blood-contacting materials due to their good mechanical properties, fatigue resistance, cytocompatibility, biosafety, and relatively good hemocompatibility. Further functionalization of the PUs using chemical synthetic methods is especially attractive for expanding their applications. Herein, a series of catechol functionalized PU (C-PU-PTMEG) elastomers containing variable molecular weight of polytetramethylene ether glycol (PTMEG) soft segment are reported by stepwise polymerization and further introduction of catechol. Tailoring the molecular weight of PTMEG fragment enables a regulable catechol content, mobility of the chain segment, hydrogen bond and microphase separation of the C-PU-PTMEG elastomers, thus offering tunability of mechanical strength (such as breaking strength from 1.3 MPa to 5.7 MPa), adhesion, self-healing efficiency (from 14.9% to 96.7% within 2 hours), anticoagulant, antioxidation, anti-inflammatory properties and cellular growth behavior. As cardiovascular stent coatings, the C-PU-PTMEGs demonstrate enough flexibility to withstand deformation during the balloon dilation procedure. Of special importance is that the C-PU-PTMEG-coated surfaces show the ability to rapidly scavenge free radicals to maintain normal growth of endothelial cells, inhibit smooth muscle cell proliferation, mediate inflammatory response, and reduce thrombus formation. With the universality of surface adhesion and tunable multifunctionality, these novel C-PU-PTMEG elastomers should find potential usage in artificial heart valves and surface engineering of stents.
研究领域:
生物材料学
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医学工程
·
心血管病学
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高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Yang Zhao,Ze-Hua Huang,Hui-Ming Zhou,Ke-Xue Zhu,Xiao-Na Guo,Wei Peng
The role of polyphenol oxidase (PPO) in the browning of fresh wet noodle sheets (FWNS) was discussed. To release the chemical formation mechanism of the dark spots formed on FWNS, the reconstituted FWNS and PPO-catechol reaction systems were prepared. Different from the overall color change of FWNS, almost all the melanins in dark spots were indirect products of PPO catalysis. The PPO catalytic dehydrogenation was an essential step for the formation of dark spots, but once the phenol dehydrogenation products were formed, the dark spots could still form through a further polymerization process, even though the PPO was completely deactivated. The optimum pH for the phenolic dehydrogenation in FWNS was about 7, and the alkaline condition was advantageous to the progress of the polymerization. Comprehensively, the maximum amount of dark spots was formed at about pH 9.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
De-Yun Ma,Si-Yun Zhang,Si-Hui Zhan,Li-Ting Feng,Shi-Gong Zeng,Qia-Quan Lin,Yong Pan
Nowadays, water pollution caused by diverse poisonous compounds, particularly hydroxy aromatic compounds and their derivatives, has become a prominent environmental issue because of the possible toxicity to human beings. This research adopted an adsorptive method to remove catechol using a water-stable hydroxyl-functionalized terbium–organic framework for the first time. The as-synthesized new metal–organic framework (Tb–MOF) shows favorable thermostability and water stability based on results of thermogravimetric analyses, water vapor sorption, and powder X-ray diffraction. Along the c axis, Tb–MOF has a three-dimensional framework with channels of 8.4 × 8.1 Å2 as well as high adsorption capacity with the maximal adsorption capacities of 260 mg/g for catechol than that of any reported adsorbent so far. Thermodynamics, adsorption kinetics, effects of pH, and effects of temperature were investigated in a batch reactor. The remarkably high adsorption capacity of Tb–MOF could be explained by the appropriate pore diameter of Tb–MOF in addition to the hydrogen bonding interplay of catechol molecules with Tb–MOF. In a breakthrough adsorption process of the Tb–MOF packed column, the adsorption breakthrough curve of a fixed bed for the catechol was found to favorably fit with the Thomas model. Because of its excellent catechol adsorption performance, the obtained Tb–MOF can be considered as a promising and suitable candidate as a high-performance catechol adsorber.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 46
·51382
·
IF 3.125
Longfang Ren,Congcong Lin,Pingchuan Lei
A series of waterborne polyurethane (PDMAPU) containing catechol group were prepared by double-bond random copolymerization of terminated double bond polyurethane prepolymer with modified acrylamido dopamine under thermal initiation. This kind of mussel-like waterborne polyurethane adhesive is inspired by marine mussel, as well as it is environment-friendly and used in bonding of leather. FTIR and 1 H NMR proved the successful introduction of catechol group into polyurethane matrix. Oxidative cross-linking between catechol unit and molecular chain in PDMAPU structure, the thermal stability and crystallization ability of PDMAPU was significantly improved. The increase of the particle size of PDMAPU emulsion showed that the introduction of catechol group changed the microstructure of polyurethane and enhanced the cross-linking degree. The water resistance of polyurethane emulsion was further improved. Compared with PU without catechol group, the peel strength of leather substrate adhered by PDMAPU emulsion increased from 0.42 to 1.93 MPa, which indicated that PDMAPU has better bonding properties with leather. The bidentate hydrogen bond formed with catechol group as the reaction sites is considered to be the key reason for the adhesion of mussel-like polyurethane adhesive to hydrophilic substrates. This work provides an alternative to prepare environment-friendly high performance adhesive for hydrophilic substrates.
研究领域:
材料科学
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化学工程
·
生物仿生学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Cheng-yuan Feng,Hai-jun Chen,Meng-yao Yang,Zhe-sheng Feng,Yan Wang
An economical and efficient strategy for fabricating high-performance metallic copper layers on polyphenylene sulfide (PPS) for high-frequency microwave applications via mussel-inspired surface modification and electroless copper plating (ECP) is illustrated in this paper. Through UV-induced surface modification of catechol (CA)/polyamine (PA), the modified PPS substrate is capable of adsorbing silver particles, which provides activation sites for subsequent ECP. The impact of CA/PA modification on the relationship between PPS and the deposited copper layer can be determined by water contact angle measurements, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and tape peel tests. The involvement of CA/PA has successfully introduced the functional groups for chemical bonding on the PPS surface, which greatly improves the adhesion between the PPS and the deposited copper layer. Moreover, after 40 min of ECP, the produced copper layer exhibits good adhesion at the 5B level (according to the ASTM D3559) and an excellent conductivity of 0.37 S/m (approx. 62% of bulk copper). Meanwhile, the deposited copper layer also has good resistance to acid, alkali, and salt corrosion (less than 25 g/m2 per unit area weight loss after 60 h of corrosion). This approach opens up an efficient path for the surface metallization of PPS, which has a broad potential for application in high-frequency copper-clad laminates (CCLs).
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-11
·
IF 20.257
Li Pengfei,Xue Shanshan,Sun Lu,Zong Xupeng,An Li,Qu Dan,Wang Xiayan,Sun Zaicheng
Carbon dots (CDs) as the advancing fluorescent carbon nanomaterial have superior potential and prospective. However, the ambiguous photoluminescence (PL) mechanism and intricate structure-function relationship become the greatest hindrances in the development and applications of CDs. Herein, red emissive CDs were synthesized in high yield from o -phenylenediamine (oPD) and catechol (CAT). The PL mechanism of the CDs is considered as the molecular state fluorophores because 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) is separated and exhibits the same PL properties and behavior as the CDs. These include the peak position and shape of the PL emission and PL excitation and the emission dependence on pH and solvent polarity. Both of them display close PL lifetime decays. Based on these, we deduce that DHQP is the fluorophore of the red emissive CDs and the PL mechanism of CDs is similar to DHQP. During the PL emission of CDs, the electron of the molecule state can transfer to CDs. The formation process of DHQP is further confirmed by the reaction intermediates (phthalazine, dimers) and oPD. These findings provide insights into the PL mechanism of this type of CDs and may guide the further development of tunable CDs for tailored properties.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tong Zhang,Yuan Chen,Yurong Zhang,Bin Liu,Yuanyuan Liu,Jianwei Zhao
Cr(VI) and catechol are common pollutants in wastewaters of tannery industry. Cr(VI) reduction by catechol results in accumulation of Cr(V)-complex and toxic o -benzoquinone. Cr(VI) reduction can be enhanced by accelerating the electron transfer from catechol to Cr(VI) using Fe(III). This electron transfer allows the continuous production of reactive oxygen species (ROS) in advanced oxidation processes, which further degrades catechol. However, the effects of catechol on Fe(III)-based Cr(VI) reduction and ROS production are not clear. In this study, the electron transfer pathway between catechol, Fe(III) and Cr(VI) was investigated along with the catechol degradation by ROS. Results show that the process of Cr(VI) reduction follows well a pseudo-second-order kinetic model, and the activation energy decreases by 4189 J/mol after electrons are transferred by Fe(III). Aqueous chromium (50 mg/L) was completely precipitated as Cr(OH) 3 , Fe x Cr 1-x (OH) 3 or Fe(OH) 3 -Cr(OH) 3 at Fe(III) concentration of 10 mmol/L. Residual catechol and Fe(II) in wastewater activated percarbonate, thereby producing OH for over 480 min at pH 3.0 and generating OH and CO 3 − for over 5 min at pH 10.0. Catechol was degraded by these ROS to butenedioic, oxalic, and formic acids, which were then mineralized to H 2 O and CO 2 . Catechol (2 mmo/L) was fully removed from wastewater with TOC removal of 37%, and the degradation was not affected by SO 4 2− and Cl − . This study provides new insights into the removal of pollutants from wastewaters via electron transfer mediated by Fe(III), and may aid in controlling the toxic effects of Cr(VI) and catechol-like organics in natural and engineered aquatic systems.
研究领域:
环境科学
·
化学工程
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Stanislas Nsanzamahoro,Félicité Pacifique Mutuyimana,Yangxia Han,Sudai Ma,Min Na,Juanjuan Liu,Yunxia Ma,Cuiling Ren,Hongli Chen,Xingguo Chen
Because the chemical properties and structures of catechol and its analogues (hydroquinone and resorcinol) are similar, it still is a great challenge to detect catechol from other hydroxybenzene isomers with high accuracy and reliability. Herein, a selective and sensitive method based on the water soluble silicon nanoparticles (Si NPs) was established for catechol detection, and to the best of our knowledge, this is the first time using Si NPs for catechol measurement. The synthesis of Si NPs was very cheap and simple, no time-consuming, and no need for high temperature processing, or special instrument. The as-synthesized Si NPs, with high salt and temperature stabilities emitted yellow-green fluorescence (540 nm). A good linear relationship was observed from 0.06 to 40 μM and the limit of detection (based on 3 s / k ) was calculated as 20 nM, and the sensor displayed a significant selectivity toward catechol over other dihydroxybenzene isomers. Moreover, the Si NPs were applied in tap water, human serum samples and Yellow River water for catechol measurement.
研究领域:
分析化学
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材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）