MOLECULES
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2022
·Vol. 27
·期 21
·7160
·
IF 4.927
Xiaojiao Zhou,Ningyao Tao,Wen Jin,Xingyuan Wang,Tuqiao Zhang,Miaomiao Ye
Recently, solar-driven seawater desalination has received extensive attention since it can obtain considerable freshwater by accelerating water evaporation at the air–water interface through solar evaporators. However, the high air–water interface temperature can cause volatile organic compounds (VOCs) to enter condensed freshwater and result in water quality safety risk. In this work, an antioxidative solar evaporator, which was composed of MoS2as the photothermal material, expandable polyethylene (EPE) foam as the insulation material, polytetrafluoroethylene (PTFE) plate as the corrosion resistant material, and fiberglass membrane (FB) as the seawater delivery material, was fabricated for the first time. The activated persulfate (PS) methods, including peroxymonosulfate (PMS) and peroxodisulfate (PDS), were applied to inhibit phenol from entering condensed freshwater during desalination. The distillation concentration ratio of phenol (RD) was reduced from 76.5% to 0% with the addition of sufficient PMS or PDS, which means that there was no phenol in condensed freshwater. It was found that the Cl−is the main factor in activating PMS, while for PDS, light, and heat are the dominant. Compared with PDS, PMS can make full utilization of the light, heat, Cl−at the evaporator’s surface, resulting in more effective inhibition of the phenol from entering condensed freshwater. Finally, though phenol was efficiently removed by the addition of PMS or PDS, the problem of the formation of the halogenated distillation by-products in condensed freshwater should be given more attention in the future.Keywords:interfacial solar heating;desalination;volatile organic compounds;phenol;persulfate
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Kejian Yang,Qi Guo,Yanlin Liu,Jinping Ni,Zhaobin Tang,Xudong Chen
The long-ignored discoloration behavior of polyamide during polymerization has a significant impact on its properties and applications. Here, we innovatively analyzed the discoloration behavior of pentamethylenediamine-derived bio-based copolyamide (PA5T/56) and proposed a possible discoloration mechanism. Pentamethylenediamine performed cyclization reactions at high temperature to generate piperidine, which was then combined with terephthalic acid to form dipiperidine terephthalate. After being oxidized, dipiperidine terephthalate was converted to terephthalic acid bis(2-carbonyl substituted piperidine), which was believed to be responsible for the discoloration of polyamide during polymerization. Moreover, it was demonstrated that the discoloration behavior led to poor spinnability and dyeability of ultrafine polyamide fibers. This work will help to optimize the polymerization process of pentamethylenediamine-derived polyamide and expand its applications in high-performance fibers and other fields.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
·
IF 4.383
Xiao-qi Chen,Zhi Huang,Yan-ying Liu,Qian Zhang,Jun-ming Hong
Conventional metal–organic frameworks (MOFs) used for electrocatalytic applications have the drawbacks of poor conductivity and instability. Herein, a Cu–1,2,3,4,5,6-benzenehexamine (Cu-HAB)/graphene oxide (GO) composite was prepared for the electrocatalytic degradation of tetracycline hydrochloride (TCH). Our characterization results show that Cu-HAB/GO has more active sites ( I D / I G = 1.0030), larger surface area (S BET = 395.3441 m 2 /g), and faster electron transport (Rct = 20.69) than Cu-HAB. Simultaneously, the improvement in the number of active sites, surface area and electron transport leads to a superior TCH electrocatalytic degradation efficiency. The reaction rate constant (0.70575 min −1 ) of the composite was higher with a 51.81% improvement observed when compared to Cu-HAB under the optimum conditions of 1 g/L NaCl, 20 mA, and 20 °C. In addition, 100% of the degradation efficiency was maintained after five cycles. A detailed study of the mechanism revealed that 1 O 2 and active chlorine were the critical active species for the degradation of TCH via quenching and electron paramagnetic resonance (EPR) studies. The possible TCH degradation pathway has been proposed. This study provides a novel and feasible method for the preparation of MOF-based electrocatalysts to expand their application to environmental fields.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Jinyu Gu,Jinxin Xie,Shasha Li,Ge Song,Minghua Zhou
The oxygen-doped carbon nanotubes coated on the carbon felt acted as cathode to enhance the electro-peroxone (OCNT-EP) process. Owing to the introduction of oxygen-containing functional groups and defect sites, the OCNT modified cathode could achieve in-situ H 2 O 2 generation, activation, and catalytic ozonation in the EP process. The OCNT-EP showed a 2.3-folds apparent first-order rate constant ( k ) compared with the EP process using CNT cathode (CNT-EP) for atrazine (ATZ) degradation. According to the processes comparison, quenching experiments, electron paramagnetic resonance (EPR) analysis and determination of hydroxyl radical, it was proved that more . OH and 1 O 2 were generated by the in-situ H 2 O 2 activation and catalytic ozonation in the OCNT-EP process. Especially, this process improved pollutants degradation under acidic condition for the in-situ H 2 O 2 activation and catalytic ozonation, expanding the pH application range of the EP process with a lower energy consumption (0.10 kWh/g ATZ). What’ more, the OCNT modified cathode performed excellent stability with 20 cycle tests, and demonstrated all improved degradation rate (21.7%−78.0%) for various pollutants (carbamazepine, sulfamethazine, phenol and 2,4-dichlorophenol). Therefore, the OCNT-EP process could be considered as a promising and enhanced EP process for wastewater treatment.
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ACS ES&T Water
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2022
·
IF 0
Guangyao Zhai,Shaozhi Liu,Shenghe Si,Yuanyuan Liu,Honggang Zhang,Yuyin Mao,Minghui Zhang,Zeyan Wang,Hefeng Cheng,Peng Wang,Zhaoke Zheng,Ying Dai,Baibiao Huang
Phenolic molecules are a kind of toxic organic pollutants commonly discharged from industrial effluents. Catalytic ozonation holds great potential in removing phenolic pollutants and further improving the removal efficiency is still the research focus of this field. In this study, defect engineering was used to construct Bi2O3 with rich oxygen vacancies (denoted as Ov-Bi2O3). Ov-Bi2O3 was found to exhibit efficient activity toward the removal of phenolic derivatives. Combined DFT calculations and experimental results suggest that oxygen vacancies play two important roles: (1) the exposed Bi sites induced by rich oxygen vacancies endow a special bridging O3 adsorption, which is beneficial to improve the kinetics of O3 decomposition; (2) O2 produced during the O3 decomposition process can be reutilized to generate 1O2, which prolongs the utilization efficiency of O3. In addition, Ov-Bi2O3 was loaded onto carbon fiber, which also demonstrates efficient activity. This work provides an alternative way to design efficient catalysts toward removal of phenolic pollutants via ozone oxidation.
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Nanomaterials
·
2022
·Vol. 12
·期 18
·3089
·
IF 5.719
Li Tan,Yiming Chen,Didi Li,Shaobin Wang,Zhimin Ao
An in situ photo-Fenton system can continuously generate H2O2by photocatalysis, activating H2O2in situ to form strong oxidizing ·OH radicals and degrading organic pollutants. A WSe2/g-C3N4composite catalyst with WSe2as a co-catalyst was successfully synthesized in this work and used for in situ photo-Fenton oxidation. The WSe2/g-C3N4composite with 7% loading of WSe2(CNW2) has H2O2production of 35.04 μmol/L, which is fourteen times higher than pure g-C3N4. The degradation efficiency of CNW2 for phenol reached 67%. By constructing an in situ Fenton-system, the phenol degradation rate could be further enhanced to 90%. WSe2can enhance the catalytic activity of CNW2 by increasing electron mobility and inhibiting the recombination of photogenerated electron–hole pairs. Moreover, the addition of Fe2+activates the generated H2O2, thus increasing the amount of strong oxidative ·OH radicals for the degradation of phenol. Overall, CNW2 is a promising novel material with a high H2O2yield and can directly degrade organic pollutants using an in situ photo-Fenton reaction.Keywords:WSe2/g-C3N4;visible light;in situ photo-Fenton;phenol degradation
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Journal of Analysis and Testing
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2022
·Vol. 6
·期 4
·382-392
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IF 0
Bai Li-Wei,Shi Yu-Fen,Zhang Xue,Liu Xue-Bo,Wu Feng,Liu Chang,Jia Jian-Feng,Lu Wen-Bo
Hydroquinone (HQ) poses immeasurable risk to human health and the natural environment on the grounds of high toxicity of organic phenolic compounds. Herein, an innovative electrochemical sensor based on two-dimensional nickel molybdate nanowires (NiMoO 4 NWs) is constructed for the ultra-sensitive determination of HQ, which can provide useful reference for the human health and environment protection. Two-dimensional NiMoO 4 NWs are prepared successfully through a facile hydrothermal reaction and annealing process. The obtained two-dimensional NiMoO 4 NWs are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), energy-dispersive X-ray spectroscopy (EDS) mapping and X-ray photoelectron spectroscopy (XPS). The accurate contents of Ni and Mo have been characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), confirming that the lower content of the nickel in NiMoO 4 NWs possesses the higher catalytic activity of HQ. Under the optimized conditions, the constructed HQ sensor exhibits satisfactory electrocatalytic activity with a low detection limit of 0.0355 μmol/L ( S/N = 3), a wide linear range of 0.05–4600 μmol/L and sensitivity of 170.064 μA/(mmol cm 2 ). The sensor has been successfully applied to the detection of HQ in rainwater, tap water, domestic sewage and drinking water samples with satisfactory recovery. At the same time, this sensor has excellent reproducibility, selectivity, and stability. The constructed sensor has potential practical application value and broad application prospect in human health and environmental monitoring.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Dan Zhou,Mengmeng Liang,Yonglian Xia,Chao Li,Mingzheng Huang,Shuming Peng,Yi Huang
Extracellular polymeric substances (EPS) are high-molecular polymers secreted by microbes and play essential roles in metallic biogeochemical cycling. Previous studies demonstrated the reducing capacity of the functional groups on EPS for metal reduction. However, the roles of different EPS components in vanadium speciation and their responsible reducing substances for vanadium reduction are still unknown. In this study, the EPS of Bacillus sp. PFYN01 was fractionated via ultrafiltration into six components with different kDa (EPS >100 , EPS 100 – 50 , EPS 50 – 30 , EPS 30 – 10 , EPS 10 – 3 , and EPS <3 ). Batch reduction experiments of the intact cells, EPS-free cells, the pristine and fractionated EPS with V 5+ were conducted and characterized. The results demonstrated that the extracellular reduction of V 5+ into V 4+ by EPS was the major reduction process. Among the functional groups in EPS, C=O/C-N of amide in protein/polypeptide and C O of carboxyl in fulvic acid-like substances might act as the reductants for V 5+ , while C O in polysaccharide molecules and P O in phosphodiester played a key role in the adsorption process. The intracellular reduction was via translocating V 5+ into the cells and releasing V 4+ by the intracellular reductases. The reducing capacity of the fractionated EPS followed a sequence of EPS <3 > EPS 10 – 3 > EPS 50 – 30 > EPS 100 – 50 > EPS 30 – 10 > EPS >100 . The small molecules of fulvic acid-like substances and amino acids were responsible for the high reducing capacity of EPS <3 . EPS >100 had the lowest reducing capacity due to its macromolecular structure decreasing the exposure of the reactive sites. In addition to reduction, those intermediate EPS components may also have supporting functions, such as connecting protein skeletons and increasing the specific surface area of EPS. Therefore, the diverse effects of the EPS components cannot be neglected in vanadium biogeochemical cycling.
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Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Wenxue Xiong,Feng Hu,Ying Liu,Gang Nie,Ling Xiao
FeMn bimetallic nanoparticles coated with nitrogen-doped graphene shells (FeMn@NG) were prepared by calcination of cellulose supported Prussian blue analogs under N 2 flow, and used as catalysts to activate peroxymonosulfate (PMS) for the degradation of 2,4,6-trichlorophenol (2,4,6-TCP). The addition of cellulose during the formation of Prussian blue analogs reduced the agglomeration of metal particles in the subsequent carbonization process, thus increasing the specific surface area and enhancing the catalytic efficiency of the obtained catalyst. 1 O 2 and the electron transfer pathway were proved to be the main mechanisms by radical quenching experiment, electron paramagnetic resonance and chronoamperometry analysis. The metal leaching of lower than 0.1 mg L −1 and high catalytic stability were attributed to the stable core-shell structure that the metals were encapsulated and protected by graphene shells. The XPS analysis implied that a Fe/Mn redox cycle existed and played a role in balancing electrons during the PMS activation . This study shows that the PMS activator with high catalytic activity can be obtained for the degradation of pollutants by combining Prussian blue analogs with cellulose.
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WATER ENVIRONMENT RESEARCH
·
2022
·Vol. 94
·期 9
·e10788
·
IF 3.306
Binbin Shao,Yating Zhu,Jie Chen,Yimin Lin,Xiaohong Guan
During oxidative treatment of iodide (I − )-containing waters, I − is easy to be oxidized into hypoiodous acid (HOI) by various oxidants and the further reaction of HOI with organic compounds can lead to the formation of iodinated disinfection by-products (I-DBPs). Oxidation of HOI to iodate (IO 3 − ) or reduction of HOI to I − has been proposed to reduce the formation of I-DBPs. Because the reaction of HOI with sulfite proceeds rapidly, this study examined the fate of iodine and the formation of I-DBPs in Mn(VII)/sulfite process. Results showed that I − was oxidized to HOI but the further formation of IO 3 − was suppressed due to the fast reduction of HOI to I − by sulfite. The reactions of HOI with SO 3 2− and IO − with SO 3 2− are the major pathways with species-specific second-order rate constants determined to be 1.12 × 10 5 M −1 s −1 and 9.43 × 10 7 M −1 s −1 , respectively. The rapid reaction of HOI with sulfite plays an essential role in minimizing the formation of iodinated products in HOI- and phenol-containing solutions. The toxic risk analysis showed that the toxicity of the generated DBPs from Mn(VII)/sulfite pre-oxidation followed by chlorination only changed slightly. Practitioner Points The decay of I − was negligible in Mn(VII)/sulfite process. The rapid reaction of HOI with SO 3 2− resulted in the negligible generation of IO 3 − . Mn(VII)/sulfite process exerted slight influence on the formation of I-DBPs. Mn(VII)/sulfite process is promising for the pretreatment of I − -containing water.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 46
·22412-22418
·
IF 3.925
Xiaoyan Jiang,Min Wang,Li Hou,Tianran Lin
A one-step colorimetric sensing platform had been constructed for catechol determination based on polyacrylic acid-coated cerium oxide (PAA-CeO2) with a significant laccase-like activity. Compared with the traditional nanozyme-based colorimetric determination methods for catechol, the PAA-CeO2 nanozyme with laccase-like activity did not require biotoxic and poor stability H2O2 in this method. PAA-CeO2 could directly catalyze the oxidation of catechol to o-quinone in the presence of dissolved O2, and the oxidation product was coupled with 4-aminoantipyrine (4-AAP) to form a pink product at the maximum absorption of 512 nm (OD512). By utilizing the relationship between the concentration of catechol and the OD512 intensity to achieve sensitivity quantitative analysis and visual determination of catechol in an ordered and one-step reaction, which provided a dynamic range from 0.5 to 50 μmol L−1 within a low detection limit of 0.121 μmol L−1. In addition, this colorimetric sensing platform based on PAA-CeO2 had satisfactory repeatability and stability, which could be used for the catalytic degradation of other phenolic compounds in the environment to ensure public health and environmental safety.
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Food Bioscience
·
2022
·
IF 5.318
Shiqi Li,Xiaowen Chen,Zhiyi Gao,Zhe Zhang,Pengfei Bi,Jing Guo
To explore a novel producing strategy for enhancing antioxidant activity and aroma of low-ethanol kiwi wine, kiwifruit juice was sequential fermentation with indigenous Zygosaccharomyces rouxii (Zr) and Saccharomyces cerevisiae (Sc) without adding sugars. The organic acids, bioactive compounds , volatile constituents, antioxidant capacities and sensory profiles were measured to evaluate the performance of different inoculation ratios. The results indicated that compared with pure fermentation of Sc, the sequential fermentations significantly increased the total flavonoids , total phenols , some mono-phenols and antioxidant activities of the low-ethanol kiwi wines, and resulted in a positive effect on organic acids mainly by reducing the content of malic acid . At the same time, sequential fermentations significantly enhanced the aroma profile of the low-ethanol kiwi wines. The higher inoculation ratio of Zr greatly increased the complexity of the volatiles, improving sweet odor of the wines. While the similar inoculation ratio of Zr and Sc significantly increased the volatile contents, intensifying the tropical fruity and kernel fruity. In addition, the partial least-squares regression analysis showed that aldehydes resulted in sourness, ethyl esters and acetate esters possessed a positive impact on tropical fruity and kernel fruity.
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