SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yingjing Tian,Siyou Fu,Ping Li,Liying Bin,Bing Tang,Laisheng Li,Guanzheng Zhuang,Yunqiang Yi,Weirui Chen
Photocatalytic ozonation (PCO) process, as an effective water purification technology, was restrained by the low mass transfer and easy combination of photo-carriers ( e cb - - h vb + ) of conventional semiconductor catalysts. To these end, this study synthesized FeOOH quantum-dots (FeOOH QDs) and boosted the PCO activity by its amorphous structure with Ibuprofen (IBP) as model pollutant. 81.5 % IBP was removed by FeOOH QDs PCO, but it was 59.1 % and 61.2 % for α-FeOOH and β-FeOOH PCO, respectively. FeOOH QDs PCO performed well at alkaline environment but was easily inhibited by co-existing ions like SO 4 2- , HCO 3 – , NO 3 – , and Cl - . Compared with those of α-FeOOH and β-FeOOH, FeOOH QDs had the narrowest band gap and the lowest e cb - - h vb + recombination, therefore, its e cb - was more favorable to activate O 3 into •OH. Tetrahedral Fe 3+ and octahedral Fe 3+ co-existed on FeOOH QDs and the tetrahedral Fe 3+ was more conducive to the adsorption of O 3 and contributed to its better PCO activity. •OH was the major reactive oxygen species accounting for IBP degradation. During FeOOH QDs PCO process, 3 degradation routes were proposed basing on 13 kinds by-products. T.E.S.T. result indicated that most of the intermediates were less toxic than IBP. This study is useful for developing catalysts for PCO process.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Jing Lv,Hui Ye,Guodong Yang,Shurui Han,Han Zhang,Yuzhong Zhang
The utilization of two-dimensional (2D) materials to construct heterogeneous catalysts provides opportunities for environmental remediation, while the incorporation of porous structures can further enhance catalytic performance. In this work, a porous 2D FeOOH/fluorine-cerium (F-Ce) nanosheet composite was designed and synthesized by a simple impregnation-precipitation method. The unique 2D porous structure of F-Ce promoted the high dispersion of FeOOH quantum dots (QDs) (∼1.4 nm) and their tight integration to form S-scheme heterojunctions. This structure offered a greater number of active sites, and significantly improved the capacity of light absorption and the separation and migration efficiency of photogenerated carriers, thus improving catalytic activity. This catalyst achieved a phenol removal rate of 98.1 % within 20 min during the photo-Fenton reaction, which significantly surpasses pure FeOOH (32.9 %) and F-Ce (21.7 %) alone. In particular, the optimized 14FeOOH/F-Ce catalyst achieved more than 95.0 % degradation efficiency within a remarkably short period of 5 min. Mott Schottky and in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS) studies demonstrated that the S-scheme charge transfer mechanism of this heterojunction synergistically enhanced the catalytic activity of the Fenton-like reaction. This study provides valuable insights for designing efficient 2D porous heterojunction catalysts for visible-light-driven Fenton applications.
研究领域:
环境科学
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催化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Rui Liu,Ru Li,Lei Yang,Rong-Xu Wang,Han-Yang Chen,Nan Wang,Zhi Li,You-Qiang Chen,Seeram Ramakrishna,Yun-Ze Long
Herein, FeOOH quantum dots and a Z-scheme BiVO4/g-C3N4 catalyst were coupled to obtain a Z-scheme heterojunction for photo-Fenton reactions to facilitate the transport of electrons and the generation of radicals. The obtained materials exhibited better visible light-driven photo-Fenton degradation of Rhodamine B, which is 22.06 times as high as pure BiVO4, 18.65 times as high as pure g-C3N4, and 3.44 times as high as BiVO4/g-C3N4, showing great potential in photo-Fenton degradation of pollutants. Moreover, the performance tests, radical capture experiments, and time-resolved fluorescence spectroscopy revealed that electron migration exists between the BiVO4/g-C3N4 and FeOOH-QDs. This composite system accelerates the cycling of Fe3+/Fe2+ during the photo-Fenton process, thus continuously generating reactive species (hydroxyl radicals (−OH) and superoxide radicals (−O2–)), leading to the rapid degradation of organic pollutants.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2022
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IF 3.985
Pei Mengxi,Lv Shangchun,Liu Yishui,Si Zhichun,Wu Xiaodong,Ran Rui,Weng Duan,Kang Feiyu
Photocatalytic removal of organic pollutants under solar irradiation at room temperature is considered an energy-saving technique of environmental remediation. However, photocatalysis is impeded by the poor response to visible light and fast charge recombination. In this work, sub-nano Pt/β-FeOOH quantum dots (QDs) were designed to shorten the charge migration path and obtain wide light harvesting. Interestingly, the crystalline β-FeOOH QDs can be obtained by loading sub-nano Pt particles via a reconstruction mechanism of amorphous FeOOH induced by H2 spillover, which facilitates the fast kinetics of charge transition and benefits the oxygen-rich surface of the catalyst for photocatalytic oxidation reactions. Moreover, the Pt-VO-Fe interfaces were proved to be the most active sites for the activation of O2. As a result, the catalyst exhibits a predominant photocatalytic performance in toluene oxidation, achieving a TOFPt of 0.591 min−1 at room temperature under visible light irradiation. This work provides a new perspective on the design and preparation of nanocatalysts for high-efficient photocatalysis under visible light irradiation.
研究领域:
环境科学
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催化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
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2024
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IF 10.7
Yifan Liu,Deke Li,Guangyi Tian,Chenggong Xu,Xionggang Chen,Jinxia Huang,Zhiguang Guo
Solar-driven water evaporation is considered as the sustainable approach to alleviate freshwater resource crisis through direct use of solar energy. However, it is still challenging to achieve the multifunctional solar evaporators equipped with both high evaporation and purification performance to handle practical complex wastewater. Here, a simple and cost-effective multifunctional 3D solar evaporator is prepared by alternately decorating the commercial sponge with FeOOH quantum dots (FQDs) supported MXene sheets composites and chitosan hydrogel coatings for enabling the solar water evaporation and organic wastewater photodegradation simultaneously. MXene composites allow the solar evaporator with excellent photothermal conversion performance, the hydrophilic chitosan hydrogel coated interconnecting skeleton structures of sponge serve as the mass transfer and water transport channels. The Fenton-catalytic FQDs anchored on the MXene sheets surface accept the photo-generated electrons of MXene sheets to induce the organic pollutant photo-Fenton degradation reaction under sunlight irradiation. The resulting evaporator possesses both excellent water evaporation rate of 2.54 kg m −2 h −1 and high degradation efficiency (99.24% for methylene blue), coupled with durable salt-resisting performance during long-term seawater desalination (20 wt.% NaCl). This work provides a simple and feasible strategy for designing multifunctional solar evaporators to meet the potential application scenarios in practice.
研究领域:
环境科学
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材料科学
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纳米技术
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可持续能源
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水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 6
·2569-2582
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IF 3.3
Shen Wentong,Zhou Liang,Liu Yongdi,Zhang Jinlong,Lei Juying
Roxarsone (ROX), a feed additive widely used worldwide, was degraded into toxic products in the natural environment. Advanced oxidation processes (AOP) based on nonradicals used for the degradation of ROX had not been reported. Herein, resorcinol–formaldehyde resins (RFs) produced by a simple high-temperature hydrothermal method had efficient photocatalytic properties to produce H 2 O 2 . FeOOH quantum dots (QDs) act as the activator and electron shuttle to decompose H 2 O 2 to produce 1 O 2 . RFs decorated with FeOOH quantum dots (RFs-Fe QDs ) were successfully synthesized and completely remove ROX with a rate of 0.03649 min −1 under simulated sunlight. Otherwise, the 99.42% arsenic-containing portion that shed from Roxarsone was eventually converted to As(V) and in-situ adsorbed by FeOOH quantum dots. The experiment data showed that ·OH, O 2 ·− and 1 O 2 participated in the degradation and 1 O 2 was the dominant reactive species. Moreover, the systems have excellent reusability and stability over a wide pH range. This study provided a new strategy for photocatalytic production of 1 O 2 to remove the ROX from water.
研究领域:
环境科学
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纳米技术
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催化
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水处理
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）