CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiahui Zhou,Xuesong Li,Jia Yuan,Zhiwei Wang
Iron-mediated activation of peroxymonosulfate (PMS) has long been of a great interest for the effective oxidation of micropollutants. In this study, ferroferric oxide doped powdered activated charcoal (PAC) was prepared by a chemical co-precipitation method in which abundant ferroferric oxide nanocatalyst (FONC) were immobilized on the PAC. The catalyst (FONC@PAC) enabled an efficient degradation of tetracycline via activation of PMS over a wide range of pH and the removal efficiency could reach up to 86.9%. It was verified that the surface-bound SO 4 •− and 1 O 2 were the predominant reactive oxygen species in the catalytic process. A possible degradation pathway of TC was deduced and the toxicity of treated wastewater was drastically reduced after the catalytic degradation. Meanwhile, the catalyst demonstrated a decent degradation performance even after four recycles and suffered from little iron loss. The novel catalyst demonstrated its great potential for the removal of antibiotics in the wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 21
·9984-9996
·
IF 9.931
Shunlong Zhang,Xiaojian Tan,Zhen Meng,Huajun Tian,Fangfang Xu,Wei-Qiang Han
Rechargeable multivalent ion (Al3+, Mg2+ and Zn2+) batteries provide a viable alternative to lithium ion batteries because of the supply risk of lithium resources and safety concern. In this study, rechargeable metal–iodine batteries, particularly aluminum/iodine batteries, were fabricated with novel active carbon cloth/polyvinylpyrrolidone (ACC/PVPI) composite cathodes prepared via a facile solution-adsorption method combined with freeze-drying. The use of active carbon cloth (ACC) endows the composites superior electronic conductivity, and significantly decreases the weight of the electrode due to its function as a current collector. Hydrogen bonding interaction between PVP and iodine in PVPI guarantees the depression of the shuttle effect of polyiodide, thus lengthening the cycle life. The density functional theory (DFT) analysis shows that such shuttle depression occurs due to the hydrogen-bonded iodine species, and the relatively large formation energy hints at higher conversion reaction efficiency of Al ion batteries. These characteristics make the composites an ideal electrode in various metal ion batteries. To be specific, the Al/I2 battery with a distinct working potential window achieves a high capacity of 180.1 mA h g−1 at 0.2C and can remain stable after 500 cycles with a stable capacity of 127 mA h g−1 at 0.6C. Moreover, at higher current density of 1C, the battery delivers a capacity of 102.7 mA h g−1 for up to 1050 cycles. These above-mentioned characteristics of metal–iodine (Li, Mg and Al/I2) batteries, related electrochemical performance measurements and theoretical modeling analysis show that the rechargeable iodine-based batteries provide a promising direction in designing high-performance energy storage/transfer systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yinghui Sun,Guojie Zhang,Ying Xu,Riguang Zhang
The nitrogen doped activated carbon (AC-N) has been successfully prepared with commercial activated carbon as carbon material followed by a simple N-doping method using melamine as nitrogen sources. Using AC-N as the supports, cobalt supported on N-doped activated carbon (Co/AC-N) were developed and used as catalyst for dry reforming reaction (DRM). It was discovered that the Co/AC-N catalysts revealed much higher catalytic performance for DRM reaction in comparison to activated carbon supported cobalt catalyst (Co/AC). Moreover, the catalytic activity was influenced by preparation conditions of AC-N such as calcination temperature and the doping amount of nitrogen. The catalysts were characterized by BET, XRD , XPS , H 2 -TPR, Raman spectroscopy and TEM. It was found that catalytic activities of the catalysts with different calcination temperature and nitrogen doping were influenced by catalyst surface defects and disorders, Co 2+ /Co 3+ molar ratio , the content of nitrogen function groups (graphitic N, pyrrolic-N and pyridinic-N) and interaction between active metal and support. The Raman spectroscopy illustrated that the N-doped catalyst surface defects and disorders increased, which improved the performances of the Redox catalysts. The XPS valence band also revealed that higher Co 2+ /Co 3+ molar ratio and nitrogen function groups was achieved by decreasing calcination temperature and increasing nitrogen doping. In short, the doping of nitrogen increased the structural defects and the interaction between active metals and supports, modified the surface electronic structure, which were facilitated the oxidation and reduction of methane and carbon dioxide.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Sheng Li,Jiming Wang,Guojie Zhang,Jun Liu,Yongkang Lv,Yongfa Zhang
Although tungsten carbide (WC) has similar properties, it is easily oxidized and deactivated during dry methane reforming (DRM). Therefore, it is of great significance to investigate the influence of carburizing atmosphere on the structure and properties of the prepared tungsten carbide material. Here, using ammonium metatungstate as the tungsten source and activated carbon (AC) as the matrix, under different carburizing atmospheres, a tungsten carbide-activated carbon (WC-AC) composite support was prepared through in-situ reduction and carbonization technology. After further loading cobalt (Co) and cerium (Ce), a series of Co-Ce/WC-AC catalysts were prepared. The catalytic performance for dry reforming was investigated. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (H 2 -TPR) and Thermogravimetric (TG) were used to characterize the crystal phase, microstructure and chemical composition of different samples. The results show that the main component of tungsten carbide prepared in a carburizing atmosphere containing CH 4 was bitungsten carbide (W 2 C); tungsten carbide prepared in a pure hydrogen carburizing atmosphere was composed of W 2 C and WC. After loading Co and Ce, the catalytic activity and stability of catalysts containing WC are significantly improved compared with those mainly containing W 2 C. Due to the presence of WC, the interaction between the metal and the carrier was enhanced, thereby improving the dispersibility and oxidation resistance of the active component Co species. At the same time, WC was helpful to transform Co 3+ to Co 2+ and Ce 4+ to Ce 3+ on the surface and inner of catalyst, which was conducive to the enrichment of chemically adsorbed oxygen on the catalyst surface and the formation of oxygen vacancies. It promoted the adsorption and activation of CO 2 , and improved the anti-carbon deposition performance of the catalyst.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Wanxiao Wang,Xiaojie Liang,Jiayu Yang,Zihan Su,Yue Chen,Lijuan Chen,Yuzhu Qian,Bei Long
The development of high-performance anode materials is crucial for aqueous ammonium ion batteries. In the meanwhile, adding an additional redox pair is thought to be a good way to raise the overall electrochemical performance of the system. In this study, a hybrid battery composed of active carbon and BiOI is developed using an NH 4 AC + NH 4 I electrolyte. Electrochemical tests and ex-situ characterization validate the dual processes of NH 4 + (de)intercalation and I − /I 2 redox. Moreover, the NH 4 I additive enhances the charge transfer of the whole battery and changes the phase transition of BiOI in the charge-discharge process. Consequently, this hybrid battery exhibits a long-term cyclic stability (70 % capacity retention after 2300 cycles at 0.2 A g −1 ) and a high specific capacity (196 mA h g −1 at 0.2 A g −1 ). The cell with a high-loading BiOI electrode (12 mg cm −2 ) also exhibits satisfactory performances, reflecting its application potential. This work provides a reference for designing aqueous hybrid battery.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Wu Jianghua,Shi Juanjuan,Fu Jie,Leidl Jamie A.,Hou Zhaoyin,Lu Xiuyang
Decarboxylation of fatty acids over non-noble metal catalysts without added hydrogen was studied. Ni/C catalysts were prepared and exhibited excellent activity and maintenance for decarboxylation. Thereafter, the effects of nickel loading, catalyst loading, temperature and carbon number on the decarboxylation of fatty acids were investigated. The results indicate that the products of cracking increased with high nickel loading or catalyst loading. Temperature significantly impacted the conversion of stearic acid but did not influence the selectivity. The fatty acids with large carbon numbers tend to be cracked in this reaction system. Stearic acid can be completely converted at 370 °C for 5 h and the selectivity to heptadecane was around 80%.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 91
·88674-88682
·
IF 3.289
Manman Xu,Quanbo Huang,Runcang Sun,Xiaohui Wang
We present a facile and green approach to simultaneously synthesize fluorescent carbon dots and porous active carbon for supercapacitors via a two-step carbonization process from a widely available protein-rich biomass precursor – soybeans. Fluorescent soybean carbon dots (SCDs) with inherent nitrogen-doping were obtained in the first low-temperature carbonization step, while hierarchical porous carbon with an interconnected microstructure was obtained by follow-up high-temperature carbonization with the insoluble residues. The effect of the activating agent (KOH) on the microstructure, conductivity, and nitrogen-doping degree of the porous carbon were explored. Significantly, we demonstrate that much less corrosive KOH (weight ratio: KOH/residue = 0.5/1) is needed to achieve a high specific surface area (1663.1 m2 g−1) and remarkable capacitive performance with high specific capacitance (337.3 F g−1 at 1 A g−1). This work provides a completely distinctive way for full utilization of biomass.
研究领域:
材料科学
·
能源技术
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2015
·
IF 2.723
Yichen Hu,Xiao Chen,Zhiqiang Liu,Gejiao Wang,Shuijiao Liao
Indigo carmine (IC) is one of the oldest, most important, and highly toxic dyes which is released from the effluents of many industries and results in serious pollution in water. In this study, the biogenic Mn oxides were activated by NaOH and then heated for 3 h at 350 °C to produce activated carbon doped with Mn oxide (Bio-MnO x -C), which were produced by culturing Mn (II)-oxidizing bacterial strain MnI7-9 in liquid A medium at 28 °C with 10 mmol/L MnCl 2 . Bio-MnO x -C was characterized by SEM, TEM , IR , XPS , XRD , etc . It contained C, O, and Mn which comprised Mn (IV) and Mn (III) valence states at a ratio of 3.81:1. It had poorly crystalline ε-MnO 2 with a specific surface area of 130.94 m 2 /g. A total of 0.1 g Bio-MnO x -C could remove 45.95 g IC from 500 mg/L IC solution after 0.5 h contact time. IC removal by Bio-MnO x -C included a rapid oxidation reaction and the removal reaction followed second-order kinetic equation . These results confirmed that Bio-MnO x -C could be a potential material for wastewater remediation.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Shan Xue,Zhilin Xie,Xiaoyu Ma,Yinqi Xu,Shiyu Zhang,Qina Jia,Rui Wan,Haisheng Tao
Carbon-based catalyst-activated persulfate-driven advanced oxidation processes (AOPs) have received great attention for wastewater treatment . Herein, a magnetic Fe-doped activated carbon (FeC 2 O 4 /AC) was successfully prepared via a conventional method using FeC 2 O 4 as an iron source and Zoysia sinica as biomass. FeC 2 O 4 /AC was characterized and used to activate peroxymonosulfate (PMS) for Rhodamine B (RhB) degradation. The influence of various factors on RhB removal was evaluated, including initial pH, temperature, coexisting ions, RhB concentration, PMS concentration and catalyst dosage. Under the optimized condition, the removal efficiency of FeC 2 O 4 /AC for RhB (300 mg/L) reached up to 97% within 150 min. Radical scavenging results and EPR experiments confirm that singlet-oxygen ( 1 O 2 ) was confirmed as the main active species in the degradation of RhB in the FeC 2 O 4 /AC/PMS system. More importantly, the possible route of 1 O 2 generation was revealed: the synergistic effect of Fe species and the activated carbon acts as a crucial part in promoting the PMS activation and contributing to the generation of 1 O 2 . The reaction rate constant ( k obs ) of FeC 2 O 4 /AC is about 7.4 times that of pure AC, and the excellent leaching rate of Fe 2+ (<0.09%) proves that this material is an excellent catalyst. This research on the development of Fe-doped activated carbon with high activity and high stability has profound implications for the effective treatment of organic wastewater.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yanming Wang,Xueying Zeng,Wei Wang,Peng Zhou,Rubing Zhang,Hongli Chen,Gang Liu
The frequent oil spill accidents have created increasingly environmental and ecological problems. Therefore, the development of effective oil-cleaning materials is of great importance. In this study, we prepared superhydrophobic polyimide/cattail-derived active carbon composite (PI/CAC) aerogels for efficient oil/water separation through a facile approach based on freeze-drying and thermal imidization. The resultant aerogel shows ultralight weight (29.7 mg/cm 3 ), superhydrophobicity (water contact angle = 151.3°), excellent compressibility, and ideal chemical stability, which are conducive to the oil sorption and extrusion at various harsh conditions including acidic, alkaline, and saline solutions, as well as oil-in-water emulsions. Typically, the optimized sample PI/CAC-3 aerogel could achieve saturation within 5–20 s, delivering a high oil sorption capacity of 25.1–71.0 g/g for various oils. When used for continuous oil/water separation, high flux of 4.47 × 10 4 L m -2 h −1 and separation efficiency of 98.3% were achieved for chloroform/water mixture by gravity-driven separation method. Furthermore, due to the high compressibility, the aerogel can be used for cycling separation through sorption-extrusion process with less than 3% decrease in separation efficiency after 10 cycles. These advantages make it a potential candidate for the treatment of wastewater polluted by various oils and/or organic solvents.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2024
·Vol. 19
·期 15
·e202400482
·
IF 3.5
Jiahua Wu,Xuan Yang,Dong Xu,Say Leong Ong,Jiangyong Hu
While numerous persulfate-based advanced oxidation processes (AOPs) have been studied based on fancy catalysts, the practical combination of Fe or Mn modified granular activated carbon (GAC) has seldom been investigated. The present study focused on a green and readily synthesized Fe−Mn bimetallic oxide doped GAC (Fe−Mn@GAC), to uncover its catalytic kinetics and mechanism when used in the peroxydisulfate (PDS)-based oxidation process for degrading Rhodamine B (RhB), a representative xenobiotic dye. The synthesized Fe−Mn@GAC was characterized by SEM-EDS, XRD, ICP-OES and XPS analyses to confirm its physicochemical properties. The catalytic kinetics of Fe−Mn@GAC+PDS system were evaluated under varying conditions, including PDS and catalyst dosages, solution pH, and the presence of anions. It was found Fe−Mn@GAC exhibited robust catalytic performance, being insensitive to a wide pH range from 3 to 11, and the presence of anions such as Cl − , SO 4 2− , NO 3 − and CO 3 2− . The catalytic mechanism was investigated by EPR and quenching experiments. The results indicated the catalytic system processed a non-radical oxidation pathway, dominated by direct electron transfer between RhB and Fe−Mn@GAC, with singlet oxygen ( 1 O 2 ) playing a secondary role. The catalytic system also managed to maintain a RhB removal above 81 % in successive 10 cycles, and recover to 89.5 % after simple DI water rinse, showing great reusability. The catalytic system was further challenged by real dye-containing wastewater, achieving a decolorization rate of 84.5 %. This work not only provides fresh insight into the kinetics and mechanism of the Fe−Mn@GAC+PDS catalytic system, but also demonstrates its potential in the practical application in real dye-containing wastewater treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 6
·e70172
·
IF 0
Xueying Liu,Jiahao Li,Bing Yuan,Fengli Yu
The synthesis of glutaraldehyde and 1,2-cyclopentanediol has great industrial significance. However, the highly selective synthesis of these two compounds, and particularly of glutaraldehyde, is challenging. To improve the reaction rate and product selectivity of cyclopentene oxidation using green hydrogen peroxide (H 2 O 2 , 30 wt%) as an oxidant, activated carbon (AC)-supported amphiphilic vanadium-doped heteropolyacid (HPA) catalysts (AC-COIMI-C n -HPA) were prepared by a series of modifications of AC, including acidification, imidazolylation, ammonium saltification, and HPAs loading. The structures and physicochemical properties of the catalysts were characterized by Fourier infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and nitrogen adsorption–desorption. The developed catalyst exhibits excellent catalytic properties and high selectivity toward glutaraldehyde. The AC carrier increases the number of effective active sites on the catalyst. The amphiphilicity of the catalyst increased the reaction rate. Vanadium doping of HPA enables fine-tuning of the oxidizability of the catalyst. The effects of the different active components of the catalyst, alkyl groups on the imidazole ring, solvent type and dosage, HPA loading on the catalyst, catalyst dosage, oxidant dosage, reaction temperature, and reaction time on the oxidation of cyclopentene were comprehensively examined. Finally, the optimized conditions were determined as follows: HPA doping by four V atoms (PW 8 V 4 ), octyl (C 8 ) linked to the imidazole, 1 mL of acetonitrile, HPA loading of 35 wt%, 500 mg of the catalyst (AC-COIMI-C 8 –35%PW 8 V 4 ), n(H 2 O 2 ):n (cyclopentene) = 2, reaction temperature and time of 40°C and 6 h, respectively. The conversion of cyclopentene was 98.8% and the total selectivity for glutaraldehyde and 1,2-cyclopentanediol was 91.6% (65.2% for glutaraldehyde and 26.4% for 1,2-cyclopentanediol). The catalyst was reused by centrifugation, and high cyclopentene conversion was maintained after three cycles.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）