Catalysts
·
2023
·Vol. 13
·期 8
·1150
·
IF 3.9
Xinying Chen,He Zhang,Shizhe Xu,Xiaoge Du,Kaida Zhang,Chun-Po Hu,Sihui Zhan,Xueyue Mi,Wen Da Oh,Xiao Hu,Ziyong Pan,Yueping Bao
In the current work, a novel Co-Fe bimetallic immobilized cellulose hydrogel bead (CoFeO@CHB) was prepared via in situ chemical precipitation followed by heat treatment and applied for tetracycline (TC) degradation in the presence of peroxymonosulfate (PMS). The characterization results indicated that the Co-Fe particles were evenly distributed within the porous cellulose hydrogel beads, without affecting their morphologies or crystal structures. During the TC degradation, the CoFeO@CHB/PMS system showed a high resistance and stability to different water bodies, and the common anions and natural organic matters showed a limited effect on TC degradation. The chemical quenching experiments (using chemicals to react with specific reactive species) as well as electron paramagnetic resonance (EPR) results showed that CoFeO@CHB can effectively active PMS to generate multiple reactive oxygen species (ROS, such as SO4•−,•OH and1O2), in which the1O2-dominated non-radical pathway played a vital role in TC degradation. Both Co and Fe were proposed as the active sites for PMS activation, and the CoFeO@CHB/PMS system showed a high potential in practical application due to its high selectivity and robustness with much less toxic intermediate products. Furthermore, a long-term continuous home-made dead-end filtration device was constructed to evaluate the stability and application potential of the CoFeO@CHB/PMS system, in which a >70% removal was maintained in a continuous 800 min filtration. These results showed the promising potential for cellulose hydrogel beads utilized as a metal-based nanomaterial substrate for organic degradation via PMS activation.Keywords:hydrogels;peroxymonosulfate;non-radical;tetracycline
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 17
·2815-2824
·
IF 2.909
Zhang He,Zhu Fang,Yu Fenting,Komarneni Sridhar,Ma Jianfeng
In this work, a multi-hollow spherical CeO 2 material was prepared, which when combined with persulfate (PS) efficiently catalyzed the degradation of basic orange II (BOII) under visible light. In the CeO 2 /PS/Vis system, the degradation rate reached 99.70% within 15 min, which suggested very strong photocatalytic activity. The effects of pH and dissolved oxygen were evaluated to provide a basis for subsequent verification of free radicals. Superoxide radicals (O 2 · − ), hydroxyl radicals ( · OH), and oxidative sulfate radicals (SO 4 · − ) generated in the process are conducive to efficient degradation. Afore mentioned radicals were proved by radical scavenging experiments with detection by electron spin-resonance spectroscopy, and the possible degradation pathways are proposed. In addition, after three consecutive degradation cycles, the degradation efficiency of the material was not less than 99%, which proved that the prepared multi-hollow spherical cerium oxide had high stability and recoverability. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 17
·7845-7855
·
IF 2.7
Le Li,Min Chao,Bei Zhang,Chengjun Song,Chunjia Luo,Luke Yan
Graphitic carbon nitride (g-C3N4) is a non-metallic semiconductor photocatalyst which is widely used in water treatment. Improving the charge separation and transfer efficiency of g-C3N4 has been a hot research topic. In this work, a sulfur-doped algal graphitic carbon nitride (SCN) was synthesized by microwave using thioacetamide as an elemental sulfur dopant. The alga-like structure endowed g-C3N4 with a higher specific surface area and visible light absorption. Combined with experiments and density functional theory (DFT) calculations, the introduction of S further changed the orbital structure and increased the charge density, leading to a shift of energy level positions as well as enhanced photogenerated electron transport. The combination of morphology adjustment and suitable elemental doping allowed the materials to achieve a significant improvement in the photocatalytic degradation performance of organics and the antibacterial activity. The degradation rate of rhodamine B (RhB) by SCN-60mg reached 0.21873 min−1, which was 12 times higher than that of bulk g-C3N4 (BCN). Similarly, SCN-60mg degraded malachite green (MG), neutral red (NR), methyl orange (MO), methylene blue (MB), tetracycline (TC), and ciprofloxacin (CIP) by 100%, 93%, 90%, 97%, 79%, and 86%, respectively, within 30 min. Meanwhile, SCN-60mg still exhibited excellent photocatalytic performance over four degradation cycles. In addition, SCN-60mg showed nearly 100% antibacterial efficiency of Staphylococcus aureus (S. aureus) within 1 hour. This study provides a new idea for fabricating effective photocatalysts for complex wastewater treatment.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Jiayi Liu,Yue Jiang,Huan Li
Catalytic wet air oxidation (CWAO) is a promising sludge treatment technology, and Cu ions were commonly used as homogeneous catalysts. However, the transformation of Cu ions in CWAO has not been investigated. This study conducted CWAO experiments using CuSO 4 as the catalyst to reveal the change in Cu forms and catalytic performance. The results showed that Cu ions increased the mineralization rate of organic matter by at least 12 % and notably enhanced the degradation of humic acids. During the reactions, Cu ions were first complexed with organic substances and finally became stable CuS/Cu 2 S slag with a ratio close to 90 %. However, all the forms of Cu exhibited similar catalytic effects. To check the result further, chalcopyrite, which has an identical mineral composition to the CuS/Cu 2 S slag, was used in CWAO to replace CuSO 4 . The result verified that chalcopyrite had the same catalytic ability, and at most 88 % of organic matter was mineralized. Therefore, this study revealed the essential characteristics of homogeneous CWAO and found an effective and cheap catalyst without a heavy burden of copper recovery from the effluent. The finding provides a more cost-effective solution for sludge treatment.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Zeyu Duan,Jianping Sheng,Qijun Tang,Xinru Chen,Ying Jia,Fan Dong,Haiqiang Wang,Zhongbiao Wu
In this study, we report efficient gas–solid phase photocatalytic reaction by employing controlled periodic illumination, intense pulsed light (IPL) technique, at extremely low duty cycles. Compared with traditional continuous illumination, IPL exhibits superior photocatalytic performance, excellent economic advantages and extremely low duty cycles. Up to now, it is the first time that IPL has been applied in gas–solid phase photocatalytic reactions coupled with multiple photocatalysts. It is demonstrated by experiments that the pulsed xenon lamps can release a large number of photons in short pulsed time, leading to a much stronger photocurrent response than that triggered by a conventional xenon lamp. Taking photocatalytic benzenes degradation as the target reaction, in-situ EPR confirmed that the IPL system can generate a large number of reactive radicals, and thus can degrade benzenes efficiently even with almost negligible illumination period.
研究领域:
环境科学
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化学工程
✓ 已验证
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2020
·
IF 7.539
Jiawei Hu,Bing Guo,Zhuo Li,Nicky Eshtiaghi,Wenquan Tao
This study investigated the issue of potassium ferrate (PF) affecting anaerobic methane generation from sludge by a set of experimental and model analyses. Experimental results indicated that the methane production was significantly promoted from 164.7 to 204.1 mL/g VSS (volatile suspended solids) with PF dosage enhanced from 0 to 0.05 g/g TSS (total suspended solids). Further enhancement of PF dosage reduced methane production, which even decreased to 135.4 mL/g VSS when PF dosage increased to 0.1 g/g TSS. Model-based analysis showed that except for methane production potential, the methane production rate was also promoted by PF treatment, which was sufficiently enhanced from 8.80 to 11.88 mL/g VSS/d when PF dosage was 0.05 g/g TSS. Mechanism studies indicated that PF not only promoted sludge disintegration, but also enhanced the proportion of biodegradable organics in sludge liquor, and the digestion potential of the non-biodegradable humus and lignocellulose were promoted.
研究领域:
环境工程
·
微生物学
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DOI
高影响因子
ACS Catalysis
·
2020
·
IF 12.35
Yani Liu,Jun Luo,Lin Tang,Chengyang Feng,Jiajia Wang,Yaocheng Deng,Haoyu Liu,Jiangfang Yu,Haopeng Feng,Jingjing Wang
Manganese oxides and carbon materials are both desirable catalysts for persulfate (PS) advanced oxidation processes in environmental remediation. Nevertheless, manganese oxides suffer from low reusability while carbon materials face the problem of limited catalytic efficiency. For the purpose of making full use of the advantages of the two materials as well as avoiding their shortcomings, carbon-coated Mn3O4 composites (Mn3O4/C) with a regular nanocube structure were designed to activate PS for the removal of organics, and the catalytic processes were deeply investigated. The catalyst prepared at 400 °C with a precursor ratio (glucose/KMnO4) of 0.5 exhibited the best catalytic performance along with satisfactory reusability owing to the protection of the outer carbon layer. According to experimental results and density functional theory calculation, there were van der Waals interaction and a part of the strong attraction between the interface of PS and Mn3O4/C, which could be enhanced by inner Mn3O4 and thus promoted the electron transfer between PS and carbon shell, and the defective edges of the carbon layer with hydroxyl (C–OH) groups could act as active sites for PS activation. Radical (SO4•–, •OH) and nonradical (1O2) oxidation processes both participated in the degradation of 2,4-dichlorophenol, in which •OH was dominating. This study not only proposed a promising catalyst for the degradation of pollutants but also expanded research ideas for future PS activation mechanism studies by integrating the experiment and simulation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Lingfang Cui,Peifang Wang,Huinan Che,Xin Gao,Juan Chen,Bin Liu,Yanhui Ao
Solar-driven interfacial water evaporation is an effective way to produce clean freshwater. However, it is still challenging that volatile organic compounds might enter the condensate in the evaporation process. Herein, we designed a novel bifunctional photothermal membrane (Co-N-C/CF) that can be applied for simultaneous water evaporation and persulfate mediating water purification . Due to the molecular thermal vibrations effect of carbon-based materials, plasmonic effect of Co NPs , the membrane exhibited an impressive water evaporation rate of 1.88 kg m −2 h −1 (1 sun irradiation). Furthermore, Co-N-C/CF could effectively activate persulfate for phenol (PE) removal through a non-radical reaction process. Experiments and density functional theory calculations illustrated that PE is favorable to be degraded while water molecules are easier to be converted into vapor in the photothermal evaporation process. Hence, the combination of persulfate-based oxidation and solar-driven water evaporation shows great application potential in the durable and efficient production of clean water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Catalysis
·
2023
·
IF 12.9
Yanfen Fang,Dengyu Ying,Huibin Niu,Yan Xu,Shaobin Wang,Ran Duan,Huaiyong Zhu,Chaoyuan Deng,Chuncheng Chen,Yingping Huang
Although metal-rich biochar (M-BC) is widely used in soil remediation and pollution control, the activation mechanism of molecular oxygen (O2) by M-BC still needs to be clarified due to the low metal loading. In this study, we enhanced the manganese content of low-temperature manganese-rich biochar (Mn-BC) by treating it with hydrogen peroxide (H2O2), resulting in the formation of MnBC-Hx (where x represents the volume of H2O2 used in mL). MnBC-H5 was particularly effective in activating O2, leading to the successful degradation of phenol and dyes. Characterizations showed that the MnII in the outer layer of MnC2O4·2H2O nanoparticles evenly dispersed over Mn-BC was oxidized to MnIII by H2O2. This process was accompanied by the removal of coordinated H2O, resulting in the formation of MnIIIC2O4 on MnBC-H5. Under visible light irradiation, MnIII can bind to O2 to form MnIIIOOH species, which facilitates the transfer of charges and generates superoxide radicals (·O2–) that effectively degrade organics. Notably, MnIII of MnBC-H5 remains stable after the organic degradation reaction. This study will not only provide a theoretical basis for developing environmentally friendly biochar-based catalysts but also promote the study of the environmental effects of biochar.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Hejiao Zhang,Shuang Liu,Wei Ding,Chao Liu,Yaoyao Huang,Hong Li,Huaili Zheng
Advanced oxidation processes (AOPs) based on sulfite (S(IV)) activation are gaining recognition as a promising Fenton-like strategy, primarily due to their ability to generate potent radicals (e.g., SO 4 − and HO ). However, the existence and role of a non-radical-driven oxidation pathway in the S(IV)-mediated degradation of contaminants remain under debate. Herein, a magnetic iron-carbon composite (FeO x @C) was fabricated using the MOF-templated method and utilized as a stable photocatalyst to activate S(IV) under UVA light, achieving >93.6 % degradation of 20 μM ofloxacin (OFL) with a high degradation rate constant of 0.073 min −1 within 45 min. The catalyst’s porous carbon structure facilitated the transport of substrates to active sites and shortened the diffusion distance between reactive species and contaminants. Adsorbed S(IV) donated one electron to photo-generated holes and exposed Fe(III) sites with the formation of SO 5 − , which then followed two distinct pathways to produce radicals (SO 4 − ) and non-radicals (Fe(IV) and 1 O 2 ) responsible for OFL degradation. By leveraging the synergy of both radicals and non-radicals, this innovative oxidative system showcased robust anti-interference capacities and exceptional performance in degrading contaminants from complex water matrices. This study provides new insights into the significant role of non-radical species in S(IV)-mediated decontamination processes.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 11
·1-18
·
IF 2.1
Canh Bui Ba,Manh Nguyen Duc,Ha Cao Hong,Vân-Anh Nguyen
In this study, a heterogeneous Fenton-like system was developed based on Fe 2 V 4 O 13 composite oxide material with the aim of decomposing some hazardous organic compounds present in industrial wastewater (e.g., methylene blue, ciprofloxacin). The research results have shown that this composite oxide material was synthesized via a simple hydrothermal method with controlled conditions optimized for hydrothermal temperature and structure aging temperature. Characterization methods indicated that the optimal hydrothermal condition was at 180 °C for 12 h, and the structure aging temperature was at 80 °C for 12 h. Under these synthesis and structure aging conditions, a characteristic nano-rod structure of the material with dimensions of 500 × 40 × 20 nm (in length × width × height) was formed. This structure exhibited the best catalytic activity for organic compound decomposition compared to other material structures synthesized under different conditions in this study. The catalytic activity in decomposing of methylene blue and ciprofloxacin was high, reaching > 99% and > 77%, respectively, after 14 min. This was achieved following the Fenton system mechanism in the presence of H 2 O 2 at pH 7 and 9. The mechanism followed the mixed homogeneous and heterogeneous Fenton process, in which the presence of leached vanadium ions accelerated the ≡Fe 2+ /≡Fe 3+ redox couple regeneration, consequently enhancing the degradation efficiency. In the mechanism, the formation of the highly active free radicals •OH and •OOH is observed and demonstrated by using specific competitive inhibitors (quinhydrone, ascorbic acid). These findings suggest the potential of the Fe 2 V 4 O 13 -based nanomaterial for the efficient treatment of organic compounds in wastewater, particularly under neutral to alkaline media. Graphical
研究领域:
环境科学
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材料科学
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催化化学
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产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Ruiqi Li,Wenhang Chen,Junqing Li,Chunhong Zhang,Yueling Sun,XiaoYan Tang,Yuan Liu
Membrane separation technology offers a sustainable and efficient solution to wastewater management; however, membrane fouling significantly impedes its application. Photocatalytic membranes, integrating photocatalytic and membrane separation technologies, enhance membrane separation efficacy while effectively mitigating organic and biological contaminations. In this work, Ag2S/PANI@PES composite membranes were prepared via a facile in situ polymerization and successive layer adsorption technique. The modified poly(ether sulfone) (PES) membrane demonstrated improved hydrophilicity and separation performance, and its heterostructure between polyaniline (PANI), Ag0, and Ag2S effectively addressed organic fouling issues. Moreover, Ag2S/PANI@PES exhibited outstanding antimicrobial properties, as well as chemical and mechanical stability.
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
PubMed
高影响因子
危险品化学品经营许可证（带存储）