RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Li Liang,Xiao Dan,Wang Ran,Xu Zunzhu,Zhang Jiwen,Jin Xiaoxian,Zou Weiwei,Lu Zhaoyang,Liu Beibei
Coating Manganese oxide (MnO x ) onto solid substrates is one of the most effective approaches for addressing the inherent agglomeration tendency of powdered MnO x in practical applications. In this study, we deposited MnO x onto activated carbon (AC) and improved the catalytic performance for formaldehyde (HCHO) removal by introducing metal platinum (Pt). When evaluated as catalysts in the HCHO catalytic reaction at ambient temperature, the obtained 0.05 wt% Pt-MnO x /AC catalyst possessed remarkable catalytic and adsorption activity and stability. It could achieve 98%HCHO removal by degrading 1.01 ppm HCHO to 0.02 ppm (0.024 mg/m 3 ) within 2 h in static test at ambient temperature. Further structure-performance investigations revealed the crucial role of metal Pt, which not only improved the oxygen activation capacity but also increased the contents of adsorbed oxygen species and enriched oxygen vacancies; therefore, key intermediates, including performic acid, formate, and CO, can be easily converted. More importantly, the deactivated catalyst regained its full activity after 6 h of air exposure, which was attributed to the rapid regeneration of surface hydroxyl groups through atmospheric O 2 and the oxidation of accumulated intermediates. This study reveals the HCHO catalytic mechanism over Pt-MnO x /AC and provides valuable insights into the design of high-activity, relatively low-cost environmental catalysts. Graphical abstract
研究领域:
环境催化
·
材料科学
·
空气污染控制
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 15
·7997-8006
·
IF 2.936
Beirong Ye,Chao Gong,Miaoliang Huang,Yongguang Tu,Xuanqing Zheng,Leqing Fan,Jianming Lin,Jihuai Wu
Cobalt telluride (CoTe) nanosheets as supercapacitor electrode materials are grown on carbon fiber paper (CFP) by a facile hydrothermal process. The CoTe electrode exhibits significant pseudo-capacitive properties with a highest Cm of 622.8 F g−1 at 1 A g−1 and remarkable cycle stability. A new asymmetric supercapacitor (ASC) is assembled based on CoTe (positive electrode) and activated carbon (negative electrode), which can expand the operating voltage to as high as 1.6 V, and has a specific capacitance of 67.3 F g−1 with an energy density of 23.5 W h kg−1 at 1 A g−1. The performance of the ASC can be improved by introducing redox additive K4Fe(CN)6 into alkaline electrolyte (KOH). The results indicate that the ASC with K4Fe(CN)6 exhibits an ultrahigh specific capacitance of 192.1 F g−1 and an energy density of 67.0 W h kg−1, which is nearly a threefold increase over the ASC with pristine electrolyte.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Wensong Chen,Jiaming Luo,Xing Du,Luhui Ding,Wenxiang Zhang
Gravity-driven biomimetic membrane (GDBM) has been developed as a promising membrane separation technology regarding ecological water treatment . Given its catalytic function on micro-pollutant removal and fouling control, detailed mechanism for fabrication material influence, organic micro-pollutants (OMPs) degradation, and operation strategy optimization have not been clear so far. In this work, the GDBM performance with various activated carbon (AC) materials (wood, coal, column and powder AC), and hydrostatic heights were investigated and verified. The activated carbon-gravity driven biomimetic membrane (AC-GDBM) fabrication tests demonstrated that AC-GDBM with powdered wooden AC had better filtration performance (up to 55 LMH flux and 97.5% removal rate) than AC-GDBM with other ACs. Furthermore, the effects of operation strategies (AC dosage, lacasse dosage, carbamazepine (CBZ) concentration, hydraulic height and rotating speed) on the filtration performance of AC-GDBM were conducted. At 25 g m −2 AC dosage, 30 g m −2 lacasse dosage, 10 mg L −1 CBZ concentration, and 5 cm hydraulic height, the optimized flux and removal rate were obtained. Further investigation revealed the surface morphology and property of AC-GDBM, displaying that powdered wooden AC and laccase formed the even biomimetic layer on base membrane. Additionally, for treating various OMPs (CBZ, tetracycline hydrochloride (TET), quinolones (norfloxacin (NFX)), and sulfonamides (sulfamethoxazole (SMZ))), with the optimized conditions, the removal rate and flux of AC-GBDM could maintain at high levels. This study demonstrates an example of a niche application , where GDBM is expected to offer a highly efficient and cost-effective ecological water treatment technology .
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 47
·67098-67107
·
IF 4.223
Long Yingtao,Liang Jianjun,Xue Yinghao
A novel composite (nZVI/Pd-AC) was prepared by loading nanoscale zero-valent iron (nZVI) and Pd on activated carbon (AC) electrode under electrodeposition with ultrasound, which was used to reductive degradation of methylene blue (MB). The loading contents of Fe and Pd in composite materials were 15.84% and 2.06%, respectively. XPS results further confirmed that the as-prepared material contained Fe 0 and Pd 0 . Without external conditions, MB could be degraded in the presence of nZVI/Pd-AC and reached equilibrium within 180 min. To investigate the reusability, the re-electrodeposition strategy was effective to refresh the active sites of nZVI/Pd-AC, and the removal efficiency only reduced by 4.51% in five circles indicating the good reusability of nZVI/Pd-AC composites. GC–MS was used to identify possible degradation pathways of MB; the results showed that the degradation products were mainly N, N-dimethylaniline and 2-amino-5-dimethylamino-benzenesulfonic acid. And the S–C, C–N bonds are the sites easier to be attacked. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Zhou Ren,Yuan Lyu,Siquan Feng,Xiangen Song,Yunjie Ding
Highly active Ir-La-S/AC catalyst was successfully prepared by co-impregnation of an activated carbon (AC) carrier with a sulfuric acid solution of Ir and La species and compared with a traditionally prepared Ir-La/AC catalyst. High angle annular dark-field-scanning transmission electron microscopy (HAADF-STEM) measurement results show that most of the Ir species on Ir-La-S/AC exist as single atomic sites, while those on Ir-La/AC exist as nanoparticles with an average diameter of 1.5 nm. Evaluation of Ir-La-S/AC as a catalyst for heterogeneous carbonylation of methanol to acetyl gave a maximum TOF (turn-over-frequency) of 2760 h −1 , which was distinctly higher than that achieved by the Ir-La/AC catalyst (approximately 1000 h −1 ). Temperature-programmed desorption of ammonia (NH 3 -TPD) result shows that the addition of sulfuric acid during the preparation procedure results in significantly more acidic sites on Ir-La-S/AC than those on Ir-La/AC, which plays a key role in the enhancement of CO insertion as the rate-determining step. Temperature-programmed reduction (TPR) and in situ X-ray photoelectron spectroscopy reveal that Ir species are more reducible, and that more Ir + might be formed by activation of Ir-La-S/AC than those on the Ir-La/AC catalyst, which is thought to be beneficial for reductive elimination of AcI from Ir 3+ species as an essential step for CH 3 I regeneration and acetyl formation.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Juan Liu,Xia Wu,Jingjing Liu,Conglu Zhang,Qi Hu,Xiaohong Hou
In this work, ofloxacin degradation was investigated by using Fe 3 O 4 -CeO 2 /activated carbon (AC) as heterogeneous Fenton catalyst. Response surface methodology based on central composite design (CCD) was used to investigate individual and interactive effects of three parameters on the ofloxacin degradation, i.e., solution pH, H 2 O 2 dosage and initial ofloxacin concentration. Optimal conditions were determined to be pH 3.3, H 2 O 2 20.0 mM, ofloxacin 12.0 mg L −1 and catalyst 0.5 g·L −1 . The ofloxacin degradation efficiency and the total organic carbon (TOC) removal was 95% and 54% within 60 min, respectively. The obtained results agreed well with the modeling prediction ( R 2 = 0.9826, and Adj- R 2 = 0.9783). The kinetic analysis implied that the reaction followed first-order kinetic with R 2 = 0.9965. According to mass spectrometry qualitative analysis, eight intermediates of ofloxacin were detected and two possible degradation pathways were proposed. The catalyst still showed degradation efficiency of 82.4% toward ofloxacin after five runs.
研究领域:
环境科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Yatao Yang,Yaqin Hou,Xiaoxiao Ding,Jie Tian,Yifan Li,Zequan Zeng,Jiancheng Wang,Zhanggen Huang
Dioxins are high chlorine, toxic, and persistent organic pollutants that exert significant pressure on both human and the environment. From the analysis of current pollutant removal of the whole life cycle, such as integrated removal of NOx, SO 2 and dioxins in a system, the dioxins oxidation activity as well as the distribution of oxidation products in the presence of SO 2 are still a challenge. In this study, dibenzofuran (DBF) was regarded as a model dioxin compound, and V 2 O 5 /AC was used as a catalyst to investigate the impact of SO 2 on degradation activity and the degradation path of DBF. Various characterization results showed that SO 2 could promote the transformation of DBF to intermediates through a reaction with lattice oxygen and lower the apparent activated energy of DBF catalytic oxidation on V 2 O 5 /AC catalysts. The density functional theory (DFT) calculations confirmed that SO 2 improved the oxidation ability of lattice oxygen on V 2 O 5 /AC. The ethyl hydrogen fumarate intermediate decreased and the small-molecule byproducts increased, providing further evidence that SO 2 accelerates the degradation of DBF and its intermediates. However, the formation of VOSO 4 would inevitably deteriorate the adsorption and oxidation abilities of V 2 O 5 /AC. A model is pioneered to describe the relationship between SO 2 promotion and VOSO 4 inhibition on DBF catalytic oxidation on a V 2 O 5 /AC catalyst. This study is expected to provide theoretical guidance for the collaborative abatement of multi-pollutants in flue gas .
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
ChemCatChem
·
2023
·Vol. 15
·期 19
·e202300703
·
IF 4.5
Xinzheng Ma,Luyao Guo,Ziang Zhao,Yu Meng,Xiaoling Mou,Ronghe Lin,Yihui Li,Li Yan,Hejun Zhu,Yunjie Ding
Graphical Heptanol oxidation : Melamine modification of commercial activated carbon can greatly tune the performance of Pt−Bi catalysts in n -heptanol oxidation. C 3 N 4 -modified AC favors the formation of PtBi alloy in comparison to N-doped AC, and consequently boosts the activity and selectivity to heptanoic acid. Different bimetallic platinum and bismuth catalysts supported on melamine-modified activated carbon (AC) are designed by a co-impregnation method. Through controlling the activation temperatures of the melamine−AC mixture, a series of N-doped and C 3 N 4 -modified AC (N−AC and C 3 N 4 −AC) are prepared. Combined powder X-ray diffractions, X-ray photoelectron spectroscopic, and high-angle annual dark-field scanning transmission electron microscopic studies demonstrate that the introduction of C 3 N 4 favors the formation of PtBi alloy and leads to increased particle sizes in comparison to the pristine and N-doped AC-supported bimetallics. The catalytic performance of the developed catalysts is evaluated in the oxidation of n -heptanol oxidation in a batch mode using O 2 as the oxidant. PtBi/C 3 N 4 −AC exhibits significantly boosted activity as well as selectivity to heptanoic acid as compared with the other catalysts. A high yield of heptanoic acid of 69 % can be achieved under the optimized reaction conditions. Furthermore, our work points to the PtBi alloy as the most active sites for the alcohol oxidation. Catalyst deactivation occurs in the cycling tests, mainly due to the collapse of the alloy phase and likely the decrease in particle sizes.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·
IF 3.4
Honghui Teng,Meng Zhang,Hongxue Du,Yuanqi Fang,Mingyue Piao
Three-dimensional (3D) electrochemical oxidation has emerged as a promising advanced oxidation process for wastewater treatment, owing to its high efficiency, environmental compatibility, and operational advantages. In this study, we developed a novel Fe/Mn co-loaded activated carbon (Fe/Mn-AC) particle electrode for the electrochemical oxidation of ammonium nitrogen NH 4 + -N) in wastewater. The as-prepared catalyst was systematically characterized through multiple analytical techniques including SEM-EDS, XRD, FTIR, XPS, and BET surface area analysis. Post-impregnation, SEM revealed maintained surface smoothness but reduced pore sizes, while BET measurements confirmed decreased surface area (from 732.38 to 650.83 m 2 /g), pore diameter (from 2.6 to 2.18 nm), and pore volume (from 0.43 to 0.37 cm 3 /g). XRD and XPS analyses identified iron and manganese oxides (Fe 2 O 3 , Fe 3 O 4 , Mn 2 O 3 , Mn 3 O 4 ) as the active phases. FTIR spectra exhibited characteristic bands of O–H (3462 cm −1 ), C–O (1571 cm −1 ), and C–C (1384 cm −1 ) in both AC and Fe/Mn-AC, with observable intensity variations after metal loading. Under optimized conditions (pH = 7, applied voltage = 14 V, Fe/Mn loading = 1 %, initial NH 4 + -N concentration = 100 mg/L), the 3D electrochemical system achieved an NH 4 + -N removal efficiency of 87.64 % with an energy consumption of 6.2 kW h/kg NH4+-N after 8 h of treatment. Radical quenching experiments confirmed the in-situ generation of hydroxyl radicals and electrons during the electrochemical process. The degradation mechanism study revealed that NH 4 + -N was primarily removed through indirect electro-oxidation pathways, with N 2 identified as the dominant end product.
研究领域:
环境工程
·
电化学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
SpringerPlus
·
2015
·Vol. 4
·期 1
·1-11
·
IF 0
Lou Shengfeng,Jia Lihua,Guo Xiangfeng,Wu Ping,Gao Lianbing,Wang Jianjun
Diethylene glycol monomethyl ether monolaurate (DGMEML) was synthesized via the reaction of diethylene glycol monomethyl ether (DGME) with methyl laurate (ML) by a new solid base catalyst of KF/CaO/AC, which was prepared by impregnation method using active carbon as carrier. The catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen physisorption-desorption and Hammett indicator methods; the effect of the mole ratio of KF to CaO, DGME to ML molar ratio, amount of catalyst, reaction time and temperature on the yield of DGMEML were studied; and the relationship between the structure of the catalyst and the yield of DGMEML was investigated. The formed KCaF3 and K2O were acting as the main active components in the catalytic transesterification; the highest yield of 96.3 % was obtained as KF-to-CaO molar ratio of 2.0, DGME to ML molar ratio of 4.0, catalyst amount of 5 wt%, and reaction time of 30 min at 75 °C; and the catalyst displayed good stability in the transesterification.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
PubMed
CHEMOSPHERE
·
2021
·
IF 7.086
Yuting Jiang,Shiying Yang,Manqian Wang,Yichao Xue,Junqin Liu,Yang Li,Dongye Zhao
Hexabromocyclododecane (HBCD) is one of the priority persistent organic pollutants (POPs), yet a cost-effective technology has been lacking for the removal and degradation of HBCD. Zero-valent aluminum (ZVAl) is an excellent electron donor. However, the inert and hydrophilic surface oxide layer impedes the release of the electrons from the core metallic Al, resulting in poor reactivity towards HBCD. In this research, a new type of modified mZVAl particles (AC@mZVAl bm/NaCl ) were prepared through ball milling mZVAl in the presence of activated carbon (AC) and NaCl, and tested for adsorption and reductive degradation of HBCD in water. AC@mZVAl bm/NaCl was characterized with a metallic Al core with newly created reactive surface coated with a thin layer of crushed carbon nanoparticles . AC@mZVAl bm/NaCl was able to rapidly (within 1 h) adsorb HBCD (C 0 = 2 mg L −1 ) and thus effectively enriched HBCD on the carbon surface of AC@mZVAl bm/NaCl . The pre-enriched HBCD was subsequently degraded by the electrons from the core Al, and ∼63.44% of the pre-sorbed HBCD was completely debrominated after 62 h of the contact. A notable time lag (∼12 h) from the onset of the adsorption to the debromination was observed, signifying the importance of the solid-phase mass transfer from the initially adsorbed AC particles to the reactive Al-AC interface. Overall, AC@mZVAl bm/NaCl synergizes the adsorptive properties of AC and the high reactivity of metallic Al, and enables a novel two-step adsorption and reductive degradation process for treating HBCD or likely other POPs.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Ziang Zhao,Wei Lu,Hejun Zhu,Wenda Dong,Yuan Lyu,Tao Liu,Xingkun Chen,Yuqing Wang,Yunjie Ding
Selective synthesis of mixed alcohols from syngas (CO + H 2 ) via Fischer–Tropsch synthesis (FTS) is an alternative one-step one-pot method. Here we report a series of Co-based catalysts supported by activated carbon (AC) and promoted by Mn and La, namely, Co x Mn y La/AC, over which the selectivity to alcohols is usually ∼26.8% and up to 31.7% at elevated reaction pressure, accompanied by a large amount of olefin byproducts (∼30%) that can be further converted to alcohols via a hydroformylation process. Detailed characterizations are performed for the structural properties of catalysts, including physisorption, chemisorption, microscopy, crystal structure, and surface element compositions. The active site of Co x Mn y La/AC catalysts is the highly dispersed metallic Co on the surface of Co 2 C nanoparticles (Co@Co 2 C), similar to that of Co x Mn/AC catalysts reported previously, while that of Co y La/AC catalysts is a combination of metallic Co and Co 2 C phases (Co–Co 2 C). The result indicates that Mn promoter plays a determinative role in the formation of active sites over Co x Mn y La/AC catalysts. Nevertheless, the La promoter tends to aggregate on the surface of cobalt nanoparticles in the form of La 2 O 3 to promote the CO insertion step and enhance the H 2 chemisorption, so that it can both facilitate the formation of alcohols and make the FTS product class shift to light components. The result proves that the structure of active sites can be established by adding a strong promoter such as Mn, and a second promoter, such as La, can be used to tune the FTS reaction toward alcohols by further modifying its surface properties.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）