FUEL
·
2023
·
IF 7.4
Zhihan Wu,Kuan Ding,Guiying Lin,Hongqi Sun,Shu Zhang
Ketonization of oxygenated compounds in pyrolytic products of biomass is an effective means for deoxygenation and upgrading of bio-oils. However, the ketonization potential of biomass-derived sugars and the mechanism underneath remain unclear. On this basis, a series of Fe doped CeO 2 catalysts were synthesized and employed for catalytic ketonization of xylan. Characterization of the catalysts proved the successful formation of the Fe-CeO x solid solution. Doping an appropriate amount of Fe (20–33%) ions on CeO 2 could obviously increase the number of oxygen vacancy and basic sites by up to 56.31% and 29.6%, respectively. During the catalytic reaction of xylan, pure CeO 2 exhibited a good ketonization ability during xylan pyrolysis, and the introduction of a certain amount of Fe further enhanced the ability. The highest yield of ketones was obtained by 33%Fe-CeO 2 , which was 38% higher than pure CeO 2 . The selectivity to linear ketones (acetone and 2-butanone) reached a maximum of 85% for 57%Fe-CeO x . Thus, oxygen-rich compounds had been converted to low oxygen containing and high-quality ketone components. Introducing Fe into CeO 2 favored the production of ethylene glycol rather than 2,3-dihydroxy propanal, and thus promoted the yield of acetone. This investigation provides fundamentals for the deoxygenation of biomass through catalytic ketonization, aiming at the production of value-added ketone products.
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Hangxi Liu,Haorong Sun,Ming Fang,Yifeng Zhang,Mingguang Kong,Zhimin Lv,Xiaoli Tan
The evaluation of the concentration of Pb(II) in solution has great significance in avoiding harm to ecology health. In this work, NH 2 -MIL-53(Fe) modified ITO glass (NH 2 -MIL-53(Fe)@ITO) was utilized as an electrochemical sensor for the detection of Pb(II) in solutions. FTIR and XPS investigation disclosed that the plentiful surface –NH group on the NH 2 -MIL-53(Fe) should be responsible for the highly efficient and selective detection abilities of Pb(II) due to the capture and conductivity abilities. The NH 2 -MIL-53(Fe) was prepared by a solvothermal technique and electrophoresed on the surface of ITO glass . A square wave voltammetry (SWV) method is employed for the sensitive determination of Pb(II). The factors of the detection condition such as the pH and ion interference are also studied. The sensitivity of 16.072 μA μM −1 cm −2 in the linear range of 2–4 μM and 54.143 μA μM −1 cm −2 in the linear range of 5–17 μM, and the limit of detection (LOD) of 0.1 μM are acquired. The repeatability and reproducibility are also studied. EIS and Tafel curves are utilized to investigate the effect of temperatures on the properties of the NH 2 -MIL-53. This work presents a facile strategy for the preparation of NH 2 -MIL-53(Fe)@ITO electrochemical sensor via electrolysis, which enhances the sensitivity toward Pb(II) and shows great application potential.
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Bing Cong,Yuqi Wu,Hongwei Zhou,Chunhai Chen,Xiaogang Zhao
Near-infrared electrochromic materials have garnered great attention due to their potential applications in optical data storage and military camouflage. Herein, a networked metal-organic coordination polymer bearing multi-redox centra ( Fe-MCP ) was successfully prepared by coordination interaction of Fe ions with D-A-D-structure ligands through the liquid-liquid interface self-assembly strategy. The resultant uniform film exhibits improved NIR electrochromic attributed to the construction of mixed-valence system. Furthermore, a sandwich-structured electrochromic device was fabricated by combining Fe-MCP electrochromic layer, a gel composed of LiClO 4 , PMMA , and PC as the electrolyte layer, and anodically coloring PB as an ion storage layer. The resultant device illustrated an optical contrast of 31.4 % at 800 nm and 34.2 % at 1000 nm, a response speed of 4.0 s/8.3 s at 800 nm and 7.6 s/2.7 s at 1000 nm, and good cycling durability. The design principles proposed in this study provide a new insight for the preparation of high-performance NIR electrochromic materials .
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chaowei Wan,Yu Yang,Jianxin Chen,Yang Wu,Zhifei Ma,Daishe Wu
Manganese sulfide (MnS) has been considered as a persulfate (PS) activator due to the presence of manganese and sulfur elements. Manganese sulfide (MnS) has been considered as a persulfate (PS) activator due to the presence of manganese and sulfur elements. However, the water solubility and hydrophobicity of MnS result in inefficient PS activation . Herein, we demonstrated that the MnS/PS system was significantly efficient for the degradation of phenol in the presence of Fe 2+ . Within the MnS/PS system, the Fe 2+ /Fe 3+ cycle could act as a station to facilitate the transfer of electrons from Mn 2+ and S 2- to PS, thereby enhancing electron transfer efficiency. As a result, the degradation efficiency of phenol reached 91.38% within 30 min in the Fe 2+ / MnS/PS system, but the MnS/PS system without Fe 2+ was only 61.63%, and the reaction rate of the former was 2.52 times that of the latter. In addition, the effects of different conditions on phenol degradation were investigated, including MnS, Fe 2+ , PS, phenol, initial solution pH, inorganic anions. Quenching experiment and electron paramagnetic resonance (EPR) confirmed that sulfate radical, hydroxyl radical and singlet oxygen were the main active substances in the degradation of phenol. This study provides a promising idea for application in the advanced treatment of groundwater and wastewater at the end of flocculation treatment with high background iron ions.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 49
·34371-34377
·
IF 3.9
Mingda Che,Hongjian Su,Xudong Zhao,Daqing Fu,Renliang Huang,Xuehui Guo,Rongxin Su
Trichloroethylene (TCE) is an Environmental Protection Agency (EPA) priority pollutant that is difficult to be removed by some remediation methods. For instance, TCE removal using persulfate (PS) activated by ferrous iron (Fe(II)) has been tested but is limited by the unstable Fe(II) concentration and the initial pH of contaminated water samples. Here we reported a new TCE removal system, in which tannic acid (TA) promoted the activation of PS with Fe(II) (TA-Fe(II)-PS system). The effect of initial pH, temperature, and concentrations of PS, Fe(II), TA, inorganic anions and humic acid on TCE removal was investigated. We found that the TA-Fe(II)-PS system with 80 mg L−1 of TA, 1.5 mM of Fe(II) and 15 mM of PS yielded about 96.2–99.1% TCE removal in the pH range of 1.5–11.0. Radical quenching experiments were performed to identify active species. Results showed that SO4˙− and ˙OH were primarily responsible for TCE removal in the TA-Fe(II)-PS system. In the presence of TA, the Fe-TA chelation and the reduction of TA could regulate Fe(II) concentration and activate persulfate for continuously releasing reactive species under alkaline conditions. Based on the excellent removal performance for TCE, the TA-Fe(II)-PS system becomes a promising candidate for controlling TCE in groundwater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 47
·22007-22016
·
IF 3.3
Yuxuan Zheng,Junping Zhao,Meifang Yan,Yuhua Gao,Haihua Li,Zhenfa Liu
Pudding-like Fe/C materials were successfully synthesized via an emulsion cross-linking method followed by a heat-treatment process. The morphologies and compositions can be easily controlled via adjusting the heat-treatment temperature. XRD, SEM, TEM, XPS, VSM, BET surface area measurements and zeta potential analysis were used to characterize the as-prepared samples. The adsorption capacity of MB (methylene blue) was systematically studied in different initial concentrations and pH of MB solution and at ambient temperature. Kinetics and isotherm synthesis were fitted well with the model of pseudo-second-order and Langmuir isotherms, respectively. The pudding-like Fe/C composites exhibited excellent adsorption performance in the removal of MB and the maximum adsorption capacity was 243.9 mg g−1, which was obtained for a 100 mg L−1 of MB solution at pH 7.0 and 25 °C. After ten cycles of adsorption experiments, the adsorption capacity can be maintained at about 93%, which indicated that the pudding-like Fe/C exhibited excellent adsorption stability and reusability.
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Zibin Pan,Mengying Liu,Zuliang Chen
Acid mine drainage (AMD) has long been an environmental problem due to its acidic solution containing toxic metal ions. Despite the fact that a variety of nanomaterials have been devised to remove metallic contaminants from aqueous solutions, there are large differences between real AMD and aqueous solutions. Here, biosynthesized Fe/Cu nanoparticles (Fe/Cu NPs) functioned to remove metalloids and heavy metals from real AMD. The removal capacities of As, Mn, Ni, Cr and Cd were severally 1.305, 0.095, 0.027, 0.082 and 0.028 mg/g, which were consistent with the pseudo-first order kinetic model but not with the intraparticle diffusion model. After removal in AMD, the particle size and pore diameter of Fe/Cu NPs rose from 86.63 ± 0.88 nm and 56.36 nm to 110.53 ± 1.40 nm and 71.51 nm, respectively. Furthermore, organic substances on Fe/Cu NPs were able to adsorb heavy metals, namely Ni, Mn, and Cd from the AMD because they acted as an encapsulant able to maintain the stability of Fe/Cu NPs. Consequently, a mechanism for the removal of As and other heavy metal ions from AMD was proposed, one which was based on the rapid adsorption of multiple heavy metals through electrostatic interaction and ion exchange. This study provides a new and important insight into removing metalloids and heavy metals from AMD using green nanomaterials.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Likun Huang,Xinyi Di,Guangzhi Wang,Yue Hou,Huixian Wang,Dandan Wang,Dongdong Wang
The use of multifunctional materials as catalysts for the removal of organic pollutants from water is an emerging means of degradation. In this study, LaCuO 3 was prepared by citric acid composite sol-gel method, new LaCu x Fe 1-x O 3 composites were prepared by doping with Fe elements to form a complete perovskite type structure, the apparent morphology, crystalline structure and elemental morphology of the materials after B-site doping were analyzed by XRD , SEM, BTE and XPS characterization. The optimal performance of the material was determined for the doping amount of Fe 3+ x = 0.4, at a gel temperature of 80 °C, a complexing agent dosage of 1:3, and a calcination temperature of 700 °C. After system preference, determined that the LaCuO 3 /PMS system has good catalytic degradation. And optimal reaction conditions were a reaction temperature of 50 °C, an initial pH of 4, PS:12COD = 1.2, and a catalyst dosage of 1 g/L. The cellulosic ethanol wastewater COD removal rate reached 91.64 %. The discharge standard of cellulosic ethanol wastewater was met. Therefore, this study can provide a reference for the treatment of cellulosic ethanol wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Qi Guo,Xiaorong Huang,Yajuan Huang,Zhaowei Zhang,Peiwu Li,Li Yu
Aflatoxin B 1 (AFB 1 ) is a prominent food contaminant known for its high toxicity. Rapid, low-cost, and sensitive detection of AFB 1 is an urgent demand for food safety risk control. In the traditional enzyme-linked immunosorbent assay (ELISA) method for AFB 1 detection, horseradish peroxide (HRP) is high-cost and possesses poor environmental stability. In this study, a direct competitive single-atom nanozymes (SAzymes) -linked immunosorbent assay was developed based on Fe-N-C SAzymes. The proposed methods exhibited excellent sensitivity, rapid detection, fabrication, and low cost. Under the optimal conditions, the limit of detection of the new assay was 3.3 pg mL −1 , with a quantitative relationship between 0.0084 and 0.358 ng mL −1 . In addition, the developed method presented good recoveries in spiked samples, ranging from 84.50% and 103.75%, with coefficients of variation below 10%. Furthermore, the developed detection method showed good consistency (R 2 = 0.9852) with the reference method, liquid chromatography/mass spectrometry (LC-MS/MS). To our knowledge, this is the first report about single-atom nanozymes-based ELISA for AFB 1 determination. This work provides a feasible strategy for the rapid and sensitive detection of food contaminants using SAzymes.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Can Fang,Xiangmei Tang,Qingfeng Yi
Exploring efficient non-precious metal oxygen electrocatalysts for oxygen reduction/evolution reactions (ORR/OER) is of great importance in electrochemical energy conversion devices like metal-air battery. Among them, carbon-based composites derived from metal-organic framework (MOF) exhibit excellent catalytic performance in ORR/OER. In this paper, Co-MOF-67 was firstly prepared, and then mixed with FeCl 3 ·6 H 2 O and dicyandiamide, followed by a one-step pyrolysis to obtain bamboo-like nitrogen-doped carbon nanotubes . For the samples, Fe and Co nanoparticles were encapsulated in the front end of the carbon nanotubes and the presence of new (n)-diamond carbon was unexpectedly found. The obtained catalyst (FeCo@CNTs-60) has an onset potential of 1.04 V for ORR in alkaline solution, which is close to the commercial Pt/C (40 wt% Pt) of 1.05 V. The onset potential of 1.02 V in quasi-neutral solution exceeds that of Pt/C of 0.99 V. In addition, FeCo@CNTs-60 exhibited a low potential difference of 0.81 V between OER and ORR potentials. The alkaline zinc-air batteries, fabricated with the sample as the electrocatalyst of air electrode, exhibit higher peak power density and stability than Pt/C, while the rechargeable batteries present superior cycling discharge/charge stability at 5 mA·cm −2 and 10 mA·cm −2 . In particular, the battery with FeCo@CNTs-60 was conducted for continuous over 1300 h of ultra long-term cycle charging / discharging test at a current density of 5 mA·cm −2 , and it reveals excellent stability with high voltage efficiency and also presents superior cycle charging / discharging stability after replacing the Zn plates and electrolyte.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yuan Tan,Jiangcheng Tang,Caichen Yang,Yunfeng Tian,Ziling Wang,Jian Pu,Bo Chi
The double perovskite (Pr 0.5 Ba 0.5 ) 1.8 Fe 1.8 Mn 0.2 O 5-δ decorated with in situ exsolved Fe nanoparticles (Fe@PBFM) was used as the cathode in a solid oxide electrolysis cell (SOEC) to convert CO 2 to CO and exhibited high efficiency and stability. This catalyst is synthesized from the simple perovskite (Pr 0.5 Ba 0.5 ) 0.9 Fe 0.9 Mn 0.1 O 3-δ (PBFM) by annealing it under an H 2 -N 2 atmosphere at 850 °C for 15 h. The cell fabricated with the Fe@PBFM cathode shows a higher current density of 1.6 A/cm 2 at 850 °C and 1.8 V than the cell with the unreduced PBFM. The increased current density can be attributed to the in situ exsolved Fe nanoparticles and generation of the Fe@PBFM double perovskite. Furthermore, the cell containing this active catalyst exhibits stable CO 2 electrolysis performance for 100 h at a stable voltage of 1.3 V, suggesting that Fe@PBFM is an attractive candidate as SOEC cathode for CO 2 electrolysis.
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Zibin Pan,Qingqiang Gao,Zuliang Chen
The elimination of arsenic (As) from arsenic-contaminated mine groundwater has become a worldwide problem because it causes environmental degradation and poses serious risks to human health. In this study, biosynthesized Fe/Cu nanoparticles (Fe/Cu NPs) were used for the simultaneous elimination of As(Ⅲ) and As(Ⅴ) from aqueous solution, resulting in their maximum amounts removed at 8.5 and 17.5 mg/g, respectively. SEM, FTIR, and XPS characterizations indicate that the Fe component on the Fe/Cu NPs acted as an adsorption and catalyst, while the Cu component mainly developed into a co-precipitation reaction with the As species, also facilitating the Fe catalytic processed. Meanwhile, adsorption isotherms , kinetics, and DFT calculations reveal that the removal of As(Ⅲ) was primarily physical/chemical adsorption and oxidation , while the elimination of As(Ⅴ) was co-precipitation and chemisorption. The most stable adsorption site, receiving 0.252 and 0.306 electrons from As(Ⅲ) and As(Ⅴ), respectively, was the unsaturated complexes of iron on the Fe/Cu NPs. Finally, the measurements and XPS results of Fe/Cu NPs in the treatment of groundwater show that the reduced capacity to remove As was attributed to a complex reaction system that disrupted the function of the Cu component, including co-precipitation and made the catalytic process possible. This explains there are differences in the reaction processes of biosynthetic Cu/Fe NPs in aqueous solution and groundwater.
✓ 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）