ENVIRONMENTAL RESEARCH
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2022
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IF 8.431
Chao Zou,Mansi Wang,Yixin Chen,Yu Qin,Yun Zhao,Liang Qiao,Shasha Zhu,Tianming Chen,Ye Yuan
Bioelectrochemical systems with biocathodes constitute a promising means to enhance the biological dechlorination of 2,4,6-trichlorophenol (2,4,6-TCP) in constructed wetland (CW) sediments. However, the effect of different cathodic potentials on the structure and function of 2,4,6-TCP-reducing biocathode communities in CW sediments is largely unknown. Here, we evaluated the performance and microbial community structure of 2,4,6-TCP-reducing biocathode systems at different cathodic potentials (− 0.5, − 0.7, − 0.9, and − 1.1 V vs. saturated calomel electrode). The dechlorination efficiency of 2,4,6-TCP with the biocathode relatively increased by 16.02%–33.17% compared to that in the open circuit. The highest 2,4,6-TCP dechlorination efficiency (92.34 ± 0.86%) was observed at − 0.7 V in sediment, which may be due to the highest abundance of functional genera (e.g., Pseudomonas , Spirochaeta ) at − 0.7 V. Metagenomic analysis provided new insights into the metabolic potential of microorganisms in CW sediments and suggested possible 2,4,6-TCP conversion pathways in sediments. 2,4,6-TCP was gradually dechlorinated to form 4-chlorophenol, followed by a ring-opening step via the activities of chlorophenol reductive dehalogenase and oxygenase (e.g., cprA , tfdB ). Interestingly, micro-electrical stimulation enhanced the expression of chlorophenol reductive dehalogenase ( cprA ). Therefore, our findings at the molecular and gene expression levels provide insights into the effects of different cathodic potentials on the performance and community structure of 2,4,6-TCP-reducing biocathode systems in CW sediments.
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ANALYTICAL LETTERS
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2022
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IF 2.267
Yu Huang,Yi Wu,Wenhui Li,Xiaohui Yan,Dapeng Wu
Highly spherical porous silica particles (PSPs) with a controlled pore size were prepared by ultrasonic spray drying and were used as a packing material for high-performance liquid chromatography (HPLC). By using organic additives added to the silica sol as porogens instead of low-melting salts, choosing the size of the colloidal SiO2 particles, and varying the type and the ratio of additives, the pore size of the PSPs was finely tuned from 2.9 to 34.4 nm. Subsequently, PSPs having pore sizes of 7.4, 13.5, and 29.0 nm were modified by chlorodimethyloctadecylsilane (PSPs-C18), and HPLC columns packed with the different PSPs-C18 were evaluated systematically using aromatic compounds and alkylbenzene derivatives as probes. A plate number of 81,000/m and the relative standard deviation of less than 1% in the retention time were obtained for pentylbenzene over 100 injection and HPLC separation cycles for the 7.4-PSPs-C18 column. Five proteins were also separated within 25 min using the 29.0-PSPs-C18 column.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Yuanxi Huang,Lingjun Bu,Shumin Zhu,Shiqing Zhou,Zhou Shi,Jianwu Wang
Peracetic acid (PAA) is a potential disinfectant for water treatment due to its high efficiency and the limited formation of disinfection byproducts (DBPs). In PAA process of this study, bromide (Br − ) significantly enhanced the degradation of phenolic compounds , including bisphenol A (BPA), phenol , p -aminophenol, and hydroquinone. The promotion is mainly due to the formation of hypobromous acid (HOBr), which comes from the oxidation of Br − by PAA. A kinetic model of PAA treatment in the presence of Br − was established to explore the degradation mechanism of phenolic compounds with good accuracy. The removal of phenolic compounds is positively related to Br − concentration. The degradation process was pH-dependent and favored at acidic conditions. In the real water matrix, the presence of multiple water matrix components may inhibit the degradation of phenolic compounds by consuming PAA and HOBr. Further, the transformation of BPA mainly involves bromination , hydroxylation, oxidation, bond cleavage, and ring opening, resulting in the formation of organic bromines. Brominated DBPs, such as dibromoacetic acid and tribromomethane were found, suggesting the potential adverse health effects of PAA treatment in the presence of Br − . The acute toxicity of phenolic compounds initially increased and then decreased with the increase of reaction time, indicating that prolonging the reaction time may reduce the environmental risk.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Wentong Yang,Jiawen Sun,Wenyu Xu,Zimo He,Yubing Dong,Yaqin Fu,Yaofeng Zhu
It is widely recognized that designing a special micro/nanostructure of microwave absorption materials for enhancing interface polarization benefits dielectric loss capability. In this work, a facile charge-driven self-assembly strategy is reported to prepare wrinkled reduced graphene oxide wrapped polymer-derived carbon (CS@rGO) microspheres . Noticeably, the unique three-dimensional (3D) multi-interface structure imparts CS@rGO microspheres with promoted microwave absorption capability. Adjusting the charge-driven self-assembly cycle times, the dielectric properties and impedance matching characteristics of the CS@rGO microspheres can be optimized. The minimum reflection loss ( RL min ) of the sample can reach up to −55.24 dB at 13.75 GHz and the effective absorption bandwidth ( RL ≤ –10 dB) is 4.30 GHz (11.55–15.85 GHz) at only a thickness of 1.85 mm. This research provides a pathway to explore the high-performance microwave absorber through the construction of the unique 3D multi-interface structure.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Yaqiong Zhang,Xu Xu,Lei Zhang
Accurate on-site profiling of the pollutants is of vital significance for estimating environmental pollution . Herein, we propose a paper-based fluorescence-sensing system to precisely report the level of multiple pollutants. A high-performance fluorescence-sensor for apparatus-free and visual on-site tandem precisely reporting phosphate ions (Pi), o -phenylenediamine (OPD), and benzaldehyde (BA) levels have been fabricated successfully by introducing synthesized red emission (>600 nm) fluorescent chromophore 10-(diethylamino)-3-hydroxy-5,6-dihydrobenzo [c]xanthen-12-ium (HTD) into the environment of CoZn zeolitic imidazolate framework (CoZn ZIF) by a simple stirring method. CoZn ZIF@HTD with the bimetallic nodes not merely provided main Zn 2+ sites for specific recognition of Pi to generate an enhanced red fluorescent optical signal , Co 3+ /Co 2+ exhibited excellent peroxidase-like activity for the catalytic oxidation of OPD substrate in the presence of H 2 O 2 resulting in color changing from red to yellow. Subsequently, the obvious yellow fading of the OPDox species took place with the addition of BA. By virtue of the sensitively visual tandem detection of Pi, OPD, and BA, the sensor can be applied to real wastewater samples. Meanwhile, this fluorescent sensor was further adopted for practical application in confocal cell imaging and security inks. Overall, this work established a fluorescent sensing system with integrated multifunctional applications for environmental and biological samples, implying the great potential for simultaneous real-time cascade detection of various important pollutants with the merit of low-cost, time-saving, and easy-to-use.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Yanqing Cong,Xiang Chen,Wanxing Wang,Lingjie Ye,Yi Zhang,Shi-Wen Lv
Herein, MOF-derived magnetic CoFe 2 O 4 with oxygen vacancy was successfully synthesized to activate peroxymonosulfate (PMS) for the effective degradation of emerging organic contaminants. The introduction of oxygen vacancy not only increased the specific surface area of CoFe 2 O 4 , but also reduce the charge transfer resistance. The CoFe 2 O 4 with oxygen vacancy showed low charge transfer resistance and oxidation potential. Benefitting from the existence of oxygen vacancy, the PMS could be activated quickly by CoFe 2 O 4 to produce SO 4 •− . As expected, developed CoFe 2 O 4 /PMS oxidation system displayed the excellent degradation ability toward various typical organic pollutants , and the organic pollutant could be mineralized into CO 2 , H 2 O and other inorganic molecules. Interestingly, both redox couples of Fe 3+ /Fe 2+ and Co 3+ /Co 2+ played a critical role in the PMS activation process. The SO 4 •− , OH • , O 2 •− and 1 O 2 were major active species in the CoFe 2 O 4 /PMS system, which were responsible for the degradation of organic pollutants . Furthermore, proposed CoFe 2 O 4 /PMS oxidation system also presented a wide pH range of applicability. The existence of magnetic property was convenient for the recovery of catalyst. All in all, this study provided a promising catalyst for the activation of PMS, and obtained results injected some new insights into the research on advanced oxidation processes (AOPs).
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Weijie Yang,Kailong Sun,Jun Wan,Yang-Ai Ma,Jiaqing Liu,Bicheng Zhu,Lin Liu,Feng Fu
The insufficient generation of oxidative active species severely limits the activity of photocatalytic aerobic oxidation for organic pollutants degradation in wastewater. Herein, transition metal phosphides (TMPs) cocatalysts, including Ni 2 P, Co 2 P, and NiCoP, were loaded on Bi 4 O 5 Br 2 nanosheets by a simple liquid assembly method. Among which, 15% NiCoP/Bi 4 O 5 Br 2 heterojunction exhibits the optimal photocatalytic activity for degrading phenolic pollutants owing to the high concentration of h + and •O 2 − active species, and it displays excellent tolerance for the inorganic ions, pH value, water matrix, and outdoor sunlight. The S-scheme charge transfer mechanism was revealed for NiCoP/Bi 4 O 5 Br 2 heterojunction, which significantly improves the separation efficiency of photogenerated charge carriers and facilitates the accumulation of active h + . Furthermore, NiCoP with high reduction potential and outstanding O 2 activation ability is served as the active site for producing •O 2 − . This work can inspire the further design of bifunctional photocatalysts for efficient photocatalytic aerobic oxidation applications.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Xue Bai,Juan Shi,Lu Xu,Xin Jin,Xuan Shi,Pengkang Jin
To overcome the shortcomings of homogeneous Fe ion activating peroxymonosulfate (PMS), such as high pH-dependence, limited cycling of Fe(III)/Fe(II) and sludge production, graphite carbon nitride (g-C 3 N 4 ) is chosen as a support for Fe ions, and reduced graphene oxide (rGO) is employed to facilitate the electron transfer process, thereby enhancing catalysis. Herein, a ternary catalyst, Fe-g-C 3 N 4 /rGO, is first applied under lightless condition for PMS activation , which exhibits ideal performance for contaminant mineralization. 82.5 % of the total organic carbon (TOC) in 100 mL of 5 mg/L bis -phenol A (BPA) was removed within 20 min by the optimal catalyst named 30%rFe 0.2 CN, which shows a strong pH adaptability over the range of 3–11 compared with a common Fenton-like system. Moreover, the highly stable Fe-g-C 3 N 4 /rGO/PMS catalytic system resists complex water matrices, especially those with high turbidity . To unveil the mechanism of PMS activation and pollutant degradation , the physicochemical properties of the as-prepared catalysts are comprehensively characterized by multiple techniques. The Fe(III) contained in both the Fe-N group and α-Fe 2 O 3 component of 30%rFe 0.2 CN not only directly reacts with PMS to produce sulfate radicals ( SO 4 − ) and hydroxyl radicals ( OH), but also combines with PMS to form the essential [Fe(III)OOSO 3 ] + active complex, thereby generating superoxide radicals ( O 2 − ) and singlet oxygen ( 1 O 2 ). Among the various reactive oxidizing species, 1 O 2 plays an important role in pollutant removal , which is additionally generated by the C O moiety of the catalyst activating PMS as well as PMS self-oxidation, indicating the dominance of the non-radical pathway in the pollutant degradation process. Due to the advantages of high efficiency, wide pH adaptability and stability, the proposed lightless Fe-g-C 3 N 4 /rGO/PMS catalytic system represents a promising avenue for practical wastewater purification.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Qinghui Yu,Guotao Liu,Jinhang Shi,Ting wen,Lei Li
It is generally challenging to design efficient, low-cost, and environmentally friendly persulfate catalytic materials for wastewater purification. We report a simple strategy to synthesize a steel converter slag-sludge carbon catalyst with steel converter slag as a template, suspended sludge as a precursor, and one-step pyrolysis . A persulfate activator was used to remove phenol and organic matter from actual wastewater leachate. The catalyst had a shell structure, a large surface area, abundant adsorption groups, and polymetallic catalytic capacity. The catalytic capacity depended on zero-valent iron (Fe 0 ), which effectively leached active Fe 2+ composite to produce hydroxyl and persulfate radicals by activating persulfate. The maximum phenol degradation was 94.5% in 55 min with 2 mM persulfate, 100 mg/L catalyst, and 20 mg/L phenol, which was 6 and 44 times greater than that of pure sludge carbon and steel converter slag, respectively. For actual wastewater leachate, the maximum removal rate of total organic carbon was 77.75% with 0.15 M persulfate, 50 g/L catalyst, and 1125 mg/L total organic carbon; all the fluorescent substances were removed. This work provides a new approach for designing persulfate catalysts derived from green resources. Further, our approach is practical for the treatment of wastewater that has high concentrations of organic material.
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ATMOSPHERIC ENVIRONMENT
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2022
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IF 5.755
Jinwen Li,Qingcai Chen,Dongjie Guan
Atmospheric aerosols contain organic compounds that can form triplet organics ( 3 C*) excited by sunlight, which plays a significant role in the aging process of aerosols. The formation characteristics of 3 C* of aerosol components with different polarities were investigated, including highly polar water-soluble matter (HP-WSM), humic-like substances (HULIS), and methanol-soluble matter (MSM). Carbon analysis, probe method and electron paramagnetic resonance were used to investigate the photochemical properties of ambient samples. The coupling effect of generation of 3 C* and reactive oxygen species (ROS) between different aerosol components was also examined. The results showed that the 3 C* generation characteristics are strongly dependent on the polarity of these components. HULIS has the strongest generation ability of 3 C*, and the MSM contributes the most to the total generation of 3 C*. It was found that the high-energy triplet states ( E T ≥ 250 kJ mol −1 ) of HULIS and HP-WSM components account for up to 80% of the water soluble components. These 3 C* have an important contribution to the photochemically generation of ROS, and the generated ROS of different components are also different, which is determined by the chromophore composition of complex organic compounds. A tyrosine-like chromophore is the main substance leading to the formation of water-soluble 3 C*, while the highly oxidized HULIS chromophore plays a leading role in the water-insoluble component. This study also found that there is a coupling effect between HP-WSM and HULIS on 3 C* and ROS generation. The generation rate of 3 C* increases by about 40% after mixing, but the generation of 1 O 2 is severely reduced. In general, this study provided deep insights into the generation characteristics and aging impact of the triplet state on atmospheric aerosols.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qi Wang,Jing Du,Yuan-Yuan Ma,Xiao-Yu Yin,Ze-Yu Tian,Zhan-Gang Han
Electrocatalytic hydrodechlorination (EHDC) provides a promising approach to efficiently remove the halogenated organic pollutants in water. Herein, a kind of noble-metal-free three-dimensional (3-D) hierarchical nickel-tungsten carbide (Ni-WC) heterostructure supported on nickel foam (NF) (Ni-WC/NF) was fabricated via the in-situ hydrothermal growth and annealing treatment of Ni,W-rich polyoxometalate {Ni 54 W 72 }. Featuring self-supported 3-D hierarchical skeleton structures and abundant Ni-WC interfaces, Ni-WC/NF exhibited high-efficient EHDC performance towards 4-chlorophenol (4-CP) with 100 % conversion efficiency in 3 h, large reaction rate constant of 2.2 × 10 -2 min −1 and high current efficiency of 13.9 %, which is comparable to the-state-of-the-art Pd-based catalysts. The active atomic hydrogen (H*) generation kinetics and the interactions of Ni-WC heterostructure with 4-CP/phenol were evaluated. DFT calculations demonstrated that the coverage of 4-CP determines the EHDC efficiency, the Ni-WC heterostructure optimizes the electronic structure of Ni, enhances the adsorption of 4-CP and facilitates the desorption of phenol, thus promoting EHDC performance. This work provides an efficient noble-metal-free catalyst for enhanced electrochemical dechlorination in organic-pollutant treatment.
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ANALYTICAL CHEMISTRY
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2022
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IF 8.008
Juan Li,Gan Wang,Xiaoli Gou,Juan Xiang,Qiu-ting Huang,Guokun Liu
Most food packages are made of plastics, nanoplastics released from which can be directly ingested and induce serious damage to organisms. Therefore, it is urgent to develop an effective and convenient method for nanoplastic determinations in food packages. In this work, we present a sandwich-based electrochemical strategy for nanoplastic determination. Positively charged Au nanoparticles were coated onto a Au electrode to selectively capture negatively charged nanoplastics in an aqueous environment. Subsequently, the nanoplastics were recognized by the signal molecule ferrocene via the hydrophobic interaction and determined by differential pulse voltammetry. Our sandwich-type detection depends on both electronegativity and hydrophobicity of nanoplastics, which make the method applicable for the assays of packages made of widely commercialized polystyrene (PS), polypropylene (PP), polyethylene (PE), and polyamide (PA). The method displays different sensitivities to above four nanoplastics but the same dynamic range from 1 to 100 μg·L–1. Based on it, the nanoplastics released from several typical food packages were assayed. Teabags were revealed with significant nanoplastic release, while instant noodle boxes, paper cups, and take-out boxes release slightly. The good recoveries in nanoplastic-spiked samples confirm the accuracy and applicability of this method. This work provides a sensitive, low-cost, and simple method without complicated instruments and pretreatment, which is of great significance for the determination of nanoplastics released from food packages.
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