INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Ning Zhang,Rongjin Shi,Man Zhou,Ping Wang,Yuanyuan Yu,Qiang Wang
Textiles with efficient and long-lasting antibacterial properties have attracted significant attention. However, a single antibacterial model is insufficient to with variable environments and achieve higher antibacterial activity. In this study, lysozyme was used as assistant and stabilizer, and the efficient peeling and functional modification of molybdenum disulfide nanosheets were realized by ultrasonic. Additionally, lysozyme in the presence of reducing agents to form amyloid-like phase-transited lysozyme (PTL) and self-assembling on the wool fabric. Finally, the AgNPs are reduced in situ by PTL and anchored onto the fabric. It has been demonstrated that Ag-MoS 2 /PTL@wool generates ROS under light irradiation, rapidly converts photothermal heat into generate hyperthermia, and promotes the release of Ag + . The aforementioned “four-in-one” approach resulted in bactericidal rates of 99.996 % (4.4 log, P < 0.0005) and 99.998 % (4.7 log, P < 0.0005) for S.aureus and E.coli , respectively. Even after 50 washing cycles, the inactivation rates remained at 99.813 % and 99.792 % for E.coli and S.aureus , respectively. In the absence of sunlight, AgNPs and PTL continue to provide continuous antibacterial activity. This work emphasizes the importance of amyloid protein in the synthesis and application of high-performance nanomaterials and provides a new direction for the safe and effective application of multiple synergistic antibacterial modes for microbial inactivation.
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CHEMICAL ENGINEERING SCIENCE
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2023
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IF 4.7
Xuan Luo,Lingrui Zhang,Xiaobo Gong,Yong Liu,Jing Tian
The removal of antibiotics from wastewater is crucial, and the activating of PMS is an effective method for this purpose. To design a suitable catalyst, a defect-enriched ilmenite-type catalyst (D-FeTiO 3 /C) was constructed using titanium dioxide slag as a precursor for peroxymonosulfate (PMS) activation to remove tetracycline (TC). The obtained D-FeTiO 3 /C catalyst showed excellent activation ability towards PMS, achieving a TC degradation efficiency over 90% within 120 min. The introduction of oxygen vacancies by ball milling significantly improved the activation ability. The effects of operational conditions on TC removal were systematically investigated in the D-FeTiO 3 /C/PMS system. The primary active species in the D-FeTiO 3 /C/PMS system were non-free radicals of singlet oxygen, although free radical species also contributed to TC degradation. Degradation pathways for TC were proposed, and most of the intermediates were non-toxic by-products. This study developed a promising method to recycle solid slag wastes and effectively treat antibiotics in water environments.
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npj Clean Water
·
2023
·Vol. 6
·期 1
·1-10
·
IF 11.4
Li Meng,Song Jiayu,Han Wei,Yeung King Lun,Zhou Shaoqi,Mo Ce-Hui
Although Fenton-like reactions have been extensively used to treat various organic contaminants in wastewaters (oily wastewaters, landfill leachate, denitrification with Fenton oxidized non-degradable large molecular organic pollutants, and removal of phosphorus, etc.), the difficulty in catalyst recovery and the instability of catalytic activity limit their practical application. Herein, iron atoms were inserted in a metal-organic framework (FeNC) with dual reaction sites as highly reactive and stable electro-Fenton-like catalysts for the catalytic oxidation of organic pollutants via the electro-Fenton-like activation reaction of peroxymonosulfate (PMS) with fractional leaching of metal ions. Experiments and density functional theory (DFT) calculations indicate that FeNC with FeN 4 and Fe–Fe active sites can rapidly deliver electrons for PMS dissociation. Further, an electrolysis reactor was constructed for the on-site generation of reactive oxygen species, which can stably and continuously purify various organic wastewaters. The combined use of an electrolysis reactor and magnetic catalyst in the current study provides a direction for the long-term remediation of organic pollutants on an industrial scale.
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Catalysts
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2023
·Vol. 13
·期 5
·847
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IF 3.9
Zhen Li,Wenxuan Jiang,Jingwen Huang,Yawen Wang,He Guo
This paper aims to investigate the promotion of persulfate (PS) activation by ZnO in discharge plasma systems for the degradation of ofloxacin (OFX). Scanning electron microscopy and transmission electron microscopy showed that ZnO nanoparticles were successfully prepared by a hydrothermal method. With an increase in the PS dosage, the removal efficiency of OFX first increased and then decreased. With an increase in the ZnO dosage, the removal efficiency of OFX showed a similar trend. Under the optimum 595 mg/L PS dosage and 295 mg/L ZnO dosage, the removal efficiency of OFX by plasma, plasma/ZnO, and plasma/ZnO/PS systems reached 53.6%, 82.8%, and 98.9%, respectively. Increasing the input power was beneficial to the degradation of OFX. ESR results showed that the addition of ZnO could further stimulate PS to produce more ·OH and ·SO4−than that of plasma alone. The capture agent experiment proved that ·OH, ·SO4−, ·O2−, and1O2all participated in the degradation of OFX. A total organic carbon (TOC) removal of 49.6% was obtained in the plasma/ZnO/PS system. Based on liquid chromatography-mass spectrometry (LC-MS) and the Toxicity Estimation Software Tool (TEST), degradation pathways and toxicity were analyzed. Compared to other technologies, it can be concluded that the plasma/ZnO/PS system is a promising technology for pollutant remediation.
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Wood Material Science & Engineering
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2023
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IF 2.2
Zhiping Wang,Anmin Huang,Shifeng Zhang,Yingying Su,Yuejin Fu
Wood emits volatile organic compounds (VOCs) that can affect people’s health and air quality. Based on advanced oxidation processes (AOPs), sulfate radicals produced via thermally-activated persulfate (Na2S2O8, KHSO5) can minimize VOCs. This research aims to apply this technique to minimize the VOC content in Pinus radiata. The results showed that terpenes and alcohols were the main VOCs emitted from Pinus radiata, which were greatly minimized using four treatments; however, acetic acid and 3-furaldehyde emissions increased. Furthermore, the temperature and oxidizing agent contributed to VOC degradation. Characterization results, including FTIR, XRD, color tests, and compressive strength indicated that the AOP treatment caused only a slight decline in the wood properties, while effectively reducing VOC emissions by as much as 32.75–61.05%.
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ANALYTICA CHIMICA ACTA
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2023
·
IF 6.2
Yue Tang,Xiangqiang Zhan,Jia Zheng,Zhengmin Xie,Shuangju Zhu,Yuangen Wu
The long-term and excessive use of organophosphorus pesticides (OPs) leads to hazardous residues in the environment, which threatens human health to a considerable extent. Colorimetric methods can quickly and readily identify pesticide residue , but they still have various challenges in accuracy and stability. Herein, a smartphone-assisted and non-enzymatic colorimetric biosensor was constructed for rapid monitoring of multiple OPs based on the enhanced effect of aptamer on the catalytic ability of octahedral Ag 2 O. It was demonstrated that the aptamer sequence could enhance the affinity of colloidal Ag 2 O to chromogenic substrates, and accelerate the generation of oxygen radicals such as superoxide radical (·O 2 − ) and singlet oxygen ( 1 O 2 ) from dissolved oxygen, thereby significantly increasing the oxidase activity of octahedral Ag 2 O. The color change of the solution can be easily converted to the corresponding RGB values by a smartphone for quantitative and rapid detection of multiple OPs. Hence, the smartphone-based and visual biosensor of multiple OPs was acquired with limit of detection of 10 μg L −1 , 28 μg L −1 and 40 μg L −1 for isocarbophos , profenofos and omethoate , respectively. The colorimetric biosensor also exhibited good recoveries in several environmental and biological samples, showing that it may have broad application prospects for detecting OPs residues.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qin Yin,Haihong Yan,Yu Liang,Haiyan Wang,Pingzhou Duan,Bo Lai
The recycling of biochar for wastewater treatment has attracted much attention due to the persistent increase of organic waste. Recently, it has been demonstrated that nitrogen (N)-doping biochar has high catalytic activity, however, the role of exogenous N and the reaction mechanism are not yet clear. In this study, biochar was manufactured from cyanobacteria from Lake Dianchi via thermal pyrolysis and decorated with N atoms to enhance its catalytic performance in peroxydisulfate (PDS) activation. The optimal synthesis of C/N = 1:2 (CN12) with high N loading, large specific area, and excellent electron transfer rate was achieved. A comprehensive study of the mechanism was conducted by integrating selective ESR, radical scavenging experiment, and electrochemical measurements, which demonstrated that the degradation of TC includes free radical and nonradical pathways. The formation of 1 O 2 and surficial reactive complexes derived from PDS performs a crucial role by attacking the adsorbed TC molecules. It is proved that N-doping accelerates the electron transfer between TC and PDS by increasing electrochemical specific area and mediation of a metastable CN12/PDS complex. Moreover, N-containing functional groups such as graphitic N, pyridinic-N and C O/C C/C N functional groups strengthened the nonradical pathway mediated by sp 2 defects. The influence of an alkaline environment indicates that electrostatic interaction between TC and CN12 determines the adsorption capacity and formation of surface reactive complexes. This study helps to understand the mechanism of an algal biochar catalyst for PDS activation and degradation of organic pollutants, and proposes a new approach for solid waste recycling.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Pei Su,Ge Song,Xuechun Wang,Qizhan Zhang,Wenyang Fu,Minghua Zhou
To improve the mineralization efficiency of pollutants under wide pH ranges by self-sustained electrochemical advanced oxidation processes (EAOPs) without any reagent addition, a flow-through system based on the bifunctional cathode of B, N-doped carbon nanotubes embedded with nano-Fe 0 particles that loaded on graphite felt (Fe@BN-C/GF) was developed. Dominant by 1 O 2 oxidation, the sulfamethazine (SMT) degradation rate and TOC removal in this recirculated flow-through system were 2.6 ∼ 3.3-folds and 1.4 ∼ 2.4-folds that of the batch system under the pH ranges of 3 ∼ 11, respectively. The SMT degradation performance was found not affected in the presence of HCO 3 – , NO 3 – , Cl - , K + , or humic acid (HA). The Fe@BN-C/GF cathode had more potential to treat enlarged wastewater by 5-folds during 10 h operation, and the SMT and TOC removal was 99% and 70.31%, respectively. The total phosphorus (TP), ammonia nitrogen (NH 3 -N) and TOC in reverse osmosis concentrate and secondary wastewater effluent could be simultaneously removed to <0.01 mg L -1 and 8 mg L -1 by this flow-through system with a low electric energy consumption (EEC) of 0.022 and 0.18 kWh gTOC -1 , respectively. This EAOPs based on the flow-through Fe@BN-C/GF cathode was self-sustained, and had very promising application prospect of high mineralization of pollutants even for low-conductivity wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zelin Shan,Fang Ma,Minghan Xu,Xiaoqing Shan,Lianbin Shan,Chongwei Cui,Haijuan Guo
Improving the yield of reactive oxygen species and inhibiting the recombination of photogenerated e - and h + have been reliable strategies to accelerate the rate-limiting step for nano photocatalytic materials. A novel magnetic Fe 3 O 4 @La-BiFeO 3 composite with variable molar ratios was successfully synthesized via a facile hydrothermal method for the photo-Fenton-like degradation of norfloxacin (NOR) under visible light irradiation. The comprehensive characterization of the crystal phase purity, morphological structure and elemental composition of the catalyst confirmed the formation of a heterojunction structure between Fe 3 O 4 and La-BiFeO 3 . The effects of the composite molar ratio, initial pH, catalyst addition, and H 2 O 2 concentration on the degradation efficiency were investigated. 20% Fe 3 O 4 @La-BiFeO 3 showed the best catalytic activity with 93.8% removal of NOR after 60 min of reaction and the pseudo-first-order rate constant was 0.05952 min −1 , attributed to the synergistic interaction of the photocatalytic and Fenton-like processes. The excellent stability and recyclability of the catalyst ensured the catalytic reactions continued to occur efficiently. The appropriate amount of Fe 3 O 4 reduced the band gap of the catalyst, and the introduction of a weak magnetic field accelerated the transfer of electrons between interfaces, effectively restrained the recombination of photogenerated e - /h + and directly enhanced the yield of ·OH and O 2 · - . This work not only realized the preparation of a heterogeneous photo-Fenton-like catalyst with high application potential for the degradation of antibiotics, but also provided new prospects for designing efficient catalysts on the basis of theoretical guidance.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Huiping Wang,Qixiang Wang,Qiwei Wang,Wenjuan Dong,Yang Liu,Qin Hu,Xiuli Song,Shaomin Shuang,Chuan Dong,Xiaojuan Gong
Bacterial infections have become a considerable obstacle to public health due to the emergence of antibiotic resistance. Herein, we rationally developed a novel and attractive nitrogen-doped carbon nanodots (N-CNDs) as efficient metal-free artificial nanozymes that synergistically and efficiently inhibit bacterial survival by inheriting the bacteriostatic ability of tea polyphenols and light-triggered oxidase-like catalytic activity . The excellent oxidase-mimicking activity exhibited by N-CNDs in the light was mediated by superoxide radicals (•O 2 − ) with a high maximum reaction rate (1.59 μM⋅s −1 ) and a low Michaelis constant (0.421 mM). Furthermore, the constructed N-CNDs-based nanozyme was demonstrated to serve as a complex biomaterial platform for efficient sterilization by light-driven oxygen molecule generation of •O 2 − . Remarkably, the inherent antibacterial ability of N-CNDs can effectively inhibit both Gram-positive and Gram-negative bacteria, particularly against Gram-positive S. aureus at a minimum inhibitory concentration (MIC 90 ) of 375 μg⋅mL −1 . The inactivation rates of N-CNDs alone agsinst E. coli and S. aureus were 59.72% and 37.15%, respectively. However, the inactivation rates of E. coli and S. aureus by N-CNDs achieved by light were as high as 97.91% and 80.02%, respectively. Encouragingly, a two-way ANOVA revealed that the concentration of N-CNDs and the duration of light exposure had a synergistic effect on antibacterial behavior, which provided favorable conditions for the sustained eradication of exposed bacteria. This synergistic strategy for bacterial eradication based on a novel metal-free carbon-based nanozyme provides a powerful and feasible approach for bacterial contamination management in food safety and environmental protection.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jing Cao,Hong Zhou,Cunping Huang,Qiang Wu,Weifeng Yao
The development of highly efficient piezocatalysts has attracted widespread attention for energy conversion and pollution abatement. This paper reports for the first time exceptional piezocatalytic properties of a Zn- and N -codoped porous carbon piezocatalyst (Zn-N x -C) derived from the zeolitic imidazolium framework-8 (ZIF-8) for both hydrogen production and degradation of organic dyes. The Zn-N x -C catalyst has a high specific surface area of 810.6 m 2 /g and retains the dodecahedron structure of ZIF-8. Under ultrasonic vibration, the hydrogen production rate of Zn-N x -C has achieved 6.29 mmol/g/h, surpassing most recently reported piezocatalysts. Additionally, the Zn-N x -C catalyst demonstrates a 94% degradation efficiency for organic rhodamine B (RhB) dye during 180 min of ultrasonic vibration. This work sheds new light on the potential of ZIF-based materials in the field of piezocatalysis and provides a promising avenue for future developments in the area.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Zijia Zhang,Zhen Wang,Jiaqi Tan,Keqiang Zhou,J. Viridiana Garcia-Meza,Shaoxian Song,Ling Xia
The development of high-efficiency catalysts is essential for activating peroxymonosulfate (PMS) to degrade organic pollutants . In this study, yeast-derived biochar (YBC) supported cobalt ferrite composite catalyst (CoFe 2 O 4 /YBC) was successfully synthesized, which can heterogeneous activate PMS to degrade tetracycline hydrochloride (TCH). The results showed that CoFe 2 O 4 /YBC could activate PMS effectively and stably owing to the synergistic effect of YBC and CoFe 2 O 4 . The degradation rate of TCH was nearly 95% under the optimal conditions, and it was still more than 90% after four cycles. Furthermore, according to quenching tests and electron paramagnetic resonance (EPR) detection, it was confirmed that ·OH, SO 4 ·- , O 2 ·- , and 1 O 2 were involved in TCH degradation, and 1 O 2 played a key role. After identifying the intermediates produced by TCH's degradation, two potential TCH degradation pathways were suggested. Further ECOSAR (2.0) software analysis revealed that the ecotoxicity of the final degradation products of TCH was small. This study demonstrates that the as-prepared CoFe 2 O 4 /YBC is an efficient and environmentally friendly PMS activation catalyst with great potential for application in the remediation of polluted aquatic environments.
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