ACS Catalysis
·
2021
·
IF 13.084
Kaili Wang,Danyang Huang,Yichi Guan,Feng Liu,Jia He,Yi Ding
Designing highly efficient and durable electrocatalysts for methanol oxidation reaction (MOR) plays a decisive role in the commercialization of direct methanol fuel cells (DMFCs). Compared with commercial Pt/C catalysts, fine-tuning the electronic structure of electrocatalysts to reduce the adsorption energy of CO while at the same time increasing the adsorption energy of OH is beneficial to improving the activity of MOR. Herein, ultrastable self-supported PtCu nanowires (NWs) with abundant Cu-vacancies have been developed, wherein the CO adsorption energy is weakened by doping of Cu elements and the OH adsorption energy is strengthened by the vacancy defect through dealloying. The well-designed PtCu NWs exhibit an outstanding performance for the MOR, with a specific activity 7.5 times higher than that for the commercial Pt/C catalyst, which transcends most electrocatalysts’ performance currently. Moreover, the stability of PtCu electrocatalysts is greatly improved over 1 h owing to a “non-CO” pathway for MOR. Further DMFC tests present a 2 times higher power density than that of commercial Pt/C, and the PtCu integrated DMFC also presents a higher stability for 24 h, transcending most Pt-based anode catalysts of DMFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Ying Zhang,Lizhen Bai,Wenfeng Zhou,Runhua Lu,Haixiang Gao,Sanbing Zhang
Fe 3 O 4 @nSiO 2 @mSiO 2 was prepared successfully and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), infrared spectrometer (FT-IR), BET surface area measurements and Zeta potential analysis techniques. The contact time, initial concentration of congo red, temperature and pH on adsorption capacity were studied. The adsorbent shows highly efficient adsorption properties, with maximum adsorption capacity of 1428 mg g − 1 for congo red, which is much higher than the other adsorbents (normally below 300 mg g − 1 ). The adsorption kinetics and isotherm of congo red on Fe 3 O 4 @nSiO 2 @mSiO 2 were systematically investigated and found that the adsorption kinetics and isotherm were well fitted by pseudo-second-order kinetic and Langmuir isotherm model.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 8
·1747
·
IF 3.2
Wei Xu,Yedi Li,Tingjun Wu,Yu Duan,Lei Zhu,Qiang Liu,Yiying Wang,Wenjie Yu
Copper interconnect technology faces limitations due to the electron’s mean free path and electromigration, driving the adoption of cobalt alternatives. This study proposes a novel mechanism to achieve superfilling by tuning the adsorption energy of additive molecules on cobalt surfaces. The adsorption energies of additives are tailored by changing molecular structures with different functional groups. Computational results reveal that carbon–carbon triple bonds critically strengthen adsorption, while ether bonds further enhance binding on distinct cobalt crystallographic planes. Specifically, 1,4-bis(2-hydroxyethoxy)-2-butyne (BEO) containing both triple bonds and ether groups exhibits the highest adsorption energy (−22.62 eV). Replacing ether with hydroxyl groups in 2-butyne-1,4-diol (BOZ) reduces the adsorption energy to −10.39 eV, while eliminating triple bonds in 1,4-butanediol diglycidyl ether (BDE) further decreases it to −8.43 eV. Experimental studies demonstrate that BOZ and BEO preferentially adsorb on the (101) and (110) planes of hexagonal close-packed cobalt (HCP-Co) due to their differential adsorption energies. This selective suppression promotes preferential growth along the densely packed (002) orientation. This leads to a trench-filling process dominated by the most densely packed plane, resulting in better electrical performance. Superfilling is achieved when molecular adsorption energies are in the range of 5–8 eV. The work establishes a functional group design strategy to regulate additive adsorption, enabling crystallographic control for advanced cobalt electrodeposition processes.
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
Materials Today Communications
·
2024
·
IF 3.7
Cheng-rui Xie,Yi-xuan Song,Gang Yang,Cheng-gong Sun,Xiang Luo,Tao Wu
The increasing presence of synthetic dyes in wastewater poses a serious environmental threat, necessitating the development of efficient adsorbents for their removal. In this study, a highly porous carbonaceous adsorbent, Fe@C-350, was synthesized through direct carbonisation of MOF-235 under an argon atmosphere for efficient removal of methyl orange from wastewater. Compared to MOF-235, Fe@C-350 retains the inherent structure of MOF-235 while exhibiting a larger BET surface area and increased pore size. The use of Fe@C-350 as an adsorbent in methyl orange adsorption demonstrates exceptional adsorption capabilities over a broad pH range with a maximum adsorption capacity of 1666.7 mg·g −1 . The isotherm analyses indicate that the adsorption process is primarily determined by monolayer physical adsorption. The kinetic studies revealed a rapid adsorption rate, characterized by a high-rate constant of 0.025 g·mg −1 ·min −1 . This can be attributed to the suitable pore size and abundant adsorption sites that facilitate the removal of methyl orange. Further investigation confirmed that Fe@C-350 retained over 98 % of its initial adsorption capacity after 10 regeneration cycles, thus confirming physical adsorption as the fundamental mechanism. Based on these findings, it can be concluded that Fe@C-350 is of significant potential as a promising candidate for the efficient removal of methyl orange from dye-containing wastewater. However, future research is necessary to show its application to the removal of a broader range of contaminants, aiming at enhancing its environmental impact and industrial viability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MARINE POLLUTION BULLETIN
·
2021
·
IF 5.553
Liu Gao,Dongdong Fu,Jinjin Zhao,Wanshan Wu,Zezheng Wang,Yuanyuan Su,Licheng Peng
To date, the degradation of microplastics (MPs; <5 mm) in different environments, particularly their adsorption characteristics for coexisted metal pollutants remains to be elucidated. Thus, this study investigated the effects of aging MPs, including polyamide (mPA), polyethylene terephthalate (mPET), polystyrene (mPS), and polyvinyl chloride (mPVC) for 3 months under UVA irradiation in four environmental media (air, seawater, sand, and soil) and adsorption of heavy metals (Cu, Cd) onto seawater-aged mPS and mPVC. The results showed that surface morphological changes, including cracks, oxidized particles, and wrinkles, appeared on aged MPs. The heavy metal adsorption capacity decreased in the order aged mPVC > aged mPS > unaged mPS > unaged mPVC, and the Cu 2+ and Cd 2+ ions competed for active adsorption sites on the MPs surfaces. Overall, the aging environment affected the physical and chemical properties of MPs and the aging of MPs enhanced their adsorption of coexisting metals tested.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 32
·4058-4063
·
IF 2.596
Hao Guo,Xiaoqiong Wang,Ning Wu,Mengni Xu,Mingyue Wang,Longwen Zhang,Wu Yang
A novel composite (CDs@ZIF-8) based on carbon dots (CDs) and zeolitic imidazolate framework (ZIF-8) was successfully synthesized by encapsulating CDs into the pores of ZIF-8 through a simple one-pot solvothermal method. The as-synthesized CDs@ZIF-8 inherited simultaneously the strong adsorption capacity of ZIF-8 and the excellent optical properties of CDs. The composite exhibited excellent dispersibility and high structural and fluorescence stability in aqueous solution, which could be employed as an excellent turn-off mode fluorescent probe to detect Cu2+. The large specific surface area and strong adsorption properties of ZIF-8 enabled the resultant composite to effectively enrich Cu2+ for further improving the analytical sensitivity. The possible fluorescence quenching mechanism has also been discussed in detail and it was found that the effective fluorescence quenching of Cu2+ to CDs@ZIF-8 could be attributed to the strong ability of Cu2+ to combine with the carboxyl group or amino group on the CD surface and the strong adsorption capacity of ZIF-8; their synergistic effect resulted in effective fluorescence quenching.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 42
·35332-35339
·
IF 3.289
Dan Chen,Xuelian Xiao,Kai Yang
In this work, a novel adsorbent derived from waste eggshell (ES) was used for phosphate and hexavalent chromium adsorption. EDS, XRD, and FTIR analyses demonstrated that α-FeOOH was successfully loaded onto the eggshell, thus increasing the available sorption sites and facilitating the adsorption abilities of phosphate and hexavalent chromium. The maximum phosphate and hexavalent chromium adsorption capacities on α-FeOOH modified eggshell (F-ES) were 248.73 and 41.57 mg g−1, which were much greater than that of the original eggshell 89.74 and 11.81 mg g−1, indicating that the modification process significantly improved the phosphate and hexavalent chromium removal abilities. Besides, the kinetics data were both well fitted with pseudo-first-order, pseudo-second-order, and Richie kinetics models, which proved that the adsorption process onto the eggshell was controlled by multiple mechanisms. In addition, the removal rates of phosphate and hexavalent chromium increased with increasing adsorbent dosage. However, the removal rates showed downward trends with pH increased from 3 to 9 and ionic strength increased from 0 to 0.1 M.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Qing Qing,Xian-ying Shi,Shao-zhong Hu,Liang Li,Ting Huang,Nan Zhang,Yong Wang
Increasing environmental problems intensify the demand for high-performance environmental purification materials. MXene is a typical transition-metal carbide/nitride material with a two-dimensional geometric feature and a good deal of functional groups, and it is considered as an efficient adsorbent for removing pollutants from wastewater. However, the easy oxidation and relatively low adsorption capacity greatly restrict its application. In this study, the MXene/polydopamine (PDA) composite particles were fabricated through the biomimetic modification method of inducing the self-polymerization of dopamine in an MXene aqueous solution. Microstructure characterizations demonstrate that PDA facilitates the exfoliation of MXene. Adsorption measurements show that MXene and PDA exhibit an apparent synergistic effect in removing chromium hexavalent Cr(VI) from aqueous solution, and more PDA content leads to a larger synergistic effect. Consequently, the composite particles exhibit an ultrahigh adsorption capacity (862.3 mg/g). Specifically, even if the composite particles were stored in aqueous solution for 2 months, they still exhibit high adsorption ability with only a 3.3% loss in adsorption capacity, indirectly confirming the enhanced stability of MXene induced by PDA. Furthermore, the composite particles also show reduction ability to Cr(VI) and about 54.3% Cr(VI) can be reduced to harmless chromium trivalent Cr(III). This study provides a new method for the preparation of MXene-based adsorbents with excellent adsorption capacity and high stability, which has broad application prospects in the field of wastewater treatment.
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
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Xinfeng Cheng,Shihao Wang,Xin Zhang,Muhammad Shahid Iqbal,Zhifu Yang,Yilong Xi,XianLing Xiang
The increasing global utilization of biodegradable plastics due to stringent regulations on traditional plastics has caused a significant rise in microplastic (MPs) pollution in aquatic ecosystems from biodegradable products. However, the environmental behavior of biodegradable MPs remains inadequately elucidated. This study explored the aging processes of polylactic acid (PLA) and polystyrene (PS) under a heat-activated potassium persulfate (K 2 S 2 O 8 ) system, as well as their adsorption characteristics towards tetracycline (TCs). In comparison to PS, the surface structure of PLA experienced more pronounced changes over aging, exhibiting evident pits, cracks, and fragmentation. The carbonyl index (CI) and oxygen/carbon ratio (O/C) of PS displayed exponential growth over time, whereas the values for PLA showed linear and exponential increases, respectively. The adsorption capacity of TCs by PS and PLA aged for 6 days increased from 0.312 mg‧g −1 and 0.457 mg‧g −1 for original PS and PLA, respectively, to 0.372 mg‧g −1 and 0.649 mg‧g −1 . Meanwhile, the adsorption rate (k 2 values) for TCs decreased by 42.03 % for PS and 79.64 % for PLA compared to their initial values. The findings indicated that biodegradable PLA-MPs may exhibit higher tetracycline carrying capacities than PS, potentially increasing environmental and organismal risks, particularly in view of aging effects.
研究领域:
环境科学
·
微生物学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2023
·Vol. 17
·期 8
·1-10
·
IF 6.4
Zhang Zhou,Huo Kai,Yan Tingxuan,Liu Xuwen,Hu Maocong,Yao Zhenhua,Liu Xuguang,Ye Tao
Photocatalytic degradation is a promising way to eliminate dye contaminants. In this work, a series of TiO 2 /ZSM-11 (TZ) nanocomposites were prepared using a facile solid state dispersion method. Methyl orange (MO), methylene blue (MB), and rhodamine B (RhB) were intentionally chosen as target substrates in the photocatalytic degradation reactions. Compared to pristine TiO 2 , negative effect was observed on MO degradation while promoted kinetics were collected on MB and RhB over TZ composites. Moreover, a much higher photocatalytic rate was interestingly achieved on RhB than MB, which indicated that a new factor has to be included other than the widely accepted electrostatic interaction mechanism to fully understand the selective photodegradation reactions. Systematic characterizations showed that TiO 2 and ZSM-11 physically mixed and maintained both the whole framework and local structure without chemical interaction. The different trends observed in surface area and the photo-absorption ability of TZ composites with reaction performance further excluded both as the promotion mechanism. Instead, adsorption energies predicted by molecular dynamics simulations suggested that differences in the adsorption strength played a critical role. This work provided a deep mechanistic understanding of the selective photocatalytic degradation of dyes reactions, which helps to rationally design highly efficient photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Wenbo Chai,Xiaoyan Liu,Junchen Zou,Xinying Zhang,Beibei Li,Tiantian Yin
Pomelo peel (PP), as one of the well-known agricultural wastes, is cost-effective and environmentally friendly. Based on PP, two new kinds of oil sorbents were prepared by using acetic anhydride and styrene. The structures of raw pomelo peel (RP), acetic anhydride-treated pomelo peel (AP) and styrene-treated pomelo peel (SP) were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), contact-angle (CA) measurements. The optimum reaction conditions for preparation of AP and SP were also investigated. The resulting products exhibited better oil sorption capacity than that of RP for diesel and lubricating oil, also SP had better oil sorption capacity than AP, while the oil sorption capacities of SP for diesel and lubricating oil reached 18.91 and 26.36 g/g, respectively. Adsorption kinetics was well described by the pseudo-second-order model. The results indicated that AP and SP, especially SP could be used as the substitute for non-biodegradable oil sorption materials.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Yanhao Xu,Ziyi Zhong,Pinle Zhang,Huancheng Huang,Kuan Cai,Xinliang Liu
Persistent organic pollutants (POPs) represent a significant environmental and health risk due to their high toxicity, persistence, strong accumulation potential, and adverse effects on human health. 4-Chlorophenol (4-CP), a type of POP, has low catalytic efficiency at low concentrations and is easily interfered with by other pollutants, making its degradation challenging. A new “recognition-enrichment-in-situ degradation” strategy is introduced to selectively remove chlorophenols from contaminated aqueous environments. In this study, ionic liquids were incorporated into the UIO-66 framework as active sites for selective adsorption. 4-CP contains phenolic hydroxyl groups and exhibits high polarity. The dispersive interactions between 4-CP and ionic liquids, along with hydrogen-bonding interactions between the Tf 2 N anion and the hydroxyl groups of 4-CP, enhance the selective enrichment of 4-CP within the nanocavities of the metal–organic frameworks (MOFs). Fe 3+ was then introduced, enabling in-situ degradation of 4-CP through photo-induced generation of free radicals and cavities from H 2 O 2 catalyzed by Fe-IL@UIO-66. The results indicated that the adsorption capacity of IL@UIO-66 for 4-CP reached 53 %, significantly higher than that for five other organic pollutants. The adsorption capacity of IL@UIO-66 for 4-CP reached 509.5 mg g −1 , 49.9 % greater than that of the original UIO-66. The degradation efficiency of 4-CP by Fe-IL@UIO-66 increased from 61 % to 81 %, and after four cycles, the material retained a catalytic activity with a degradation efficiency of 64.2 %. This study provides valuable insights into the recognition-enrichment-in-situ catalytic strategy for treating low-concentration, highly toxic wastewater.
研究领域:
环境科学
·
材料科学
✓ 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）