SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xiaodong Ma,Tiantong Rao,Mingchen Zhao,Zhiwei Jia,Gengbo Ren,Jingyang Liu,Haiwei Guo,Zhineng Wu,Haijiao Xie
In-situ generation of iron catalysts in electro-Fenton (EF) process deserves more attention like in-situ generation of H 2 O 2 . In this work, a novel induced zero-valent iron (ZVI) electrode, which was composed of a graphite plate with good conductivity, ZVI powders and a small magnet, was for the first time designed through magnetic assembly. Fe 2+ could be slowly generated in-situ from induced ZVI electrode and effectively trigger EF oxidation of chlorobenzenes (CB) under neutral pH. Compared to the in-situ rapid release of Fe 2+ from sacrificial anodes and traditional one-time external dosing of Fe 2+ in EF, in-situ slow release of Fe 2+ from induced ZVI electrode was the most effective way to activate electrogenerated H 2 O 2 under neutral pH. Induced ZVI electrode had obvious advantages in terms of effective active areas, corrosion potentials and current responses. The optimum conditions including pH of 7.0, current of 29.9 mA, ZVI of 0.10 g and electrolysis time of 35.25 min were obtained by the response surface methodology (RSM) model with the maximum removal efficiency of 99.12%. The uniformed weak positive charge on the ZVI powders induced by the electric field was the dominant contribution to the in-situ slow release of Fe 2+ from the induced electrode. And, the impact of magnetic field on the CB removal and the release of iron ions was negligible. The degradation mechanism was revealed through the Fukui function based on the density functional theory (DFT) and by-products analysis. The evolution of acute toxicity to zebrafish in EF was further clarified. Besides, this induced ZVI electrode could be easily reused and has satisfactory stability. In briefly, this work provided a novel idea for the in-situ slow release of Fe 2+ in EF process.
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BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Jingyang Luo,Wei Du,Siqin Chu,Yulu Xu,Qin Zhang,Le Zhang,Xiaoshi Cheng,Wenxuan Huang,Jiashun Cao,Yinglong Su
The occurrence of antibiotic resistance genes (ARGs) in waste activated sludge (WAS) fermentation was investigated with persulfate (PS)-based treatment. ARGs affiliated with multidrug ( mex P), macrolide ( bla OXA-129 ), tetracycline ( tet B), sulfonamide ( sul 1), and vancomycin ( van RG) types were significantly decreased by PS/Fe treatment. Mechanistic investigations revealed that PS/Fe possessed oxidating potential and exhibited devastating effects on WAS fermentation. First, PS/Fe promoted cell structure damage, which facilitated ARGs release from potential hosts. A co-occurrence network analysis indicated that Fe/PS suppressed the proliferation of potential host bacteria. In addition, the PS/Fe treatment induced the decreased abundance of certain functional genes involved in pathways associated with ARGs dissemination. Finally, variation partitioning analysis demonstrated that the microbial community structure exhibited more vital effects on ARGs fates than physicochemical factors ( i.e., pH and ORP) and gene expression ( i.e., two-component system). This work provided a deeper understanding of the critical factors used to determine ARGs fates during WAS fermentation.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 14
·20711-20720
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IF 4.223
Jiang Ying,Du Linna,Cheng Qilu,Jin Zhuo,Hui Cai,Zhao Yuhua,Jiang Hui,Xu Ligen
Nanoparticles and organic pollutants are two major contaminants found in aquatic environments. Algae are regarded as the model organism for the risk assessment of pollutants in water. In our previous study, we investigated the toxic effects of nonylphenol (NP), a typical organic water pollutant, on algae; however, it remains unclear how algae respond to the coexistence of NP and nanoparticles. In this study, a concentration gradient of nanoscale zero-valent iron (nZVI; 10, 50, 100, and 200 mg/L) was added to NP-exposed Dictyosphaerium sp. to investigate both the toxic effects of this combination and the potential for NP removal. nZVI had a dose-dependent effect on NP-exposed algae, with high nZVI concentrations significantly decreasing algal biomass and pigment content, as well as severely damaging algal cellular ultrastructure. In addition, genes involved in antioxidant response, photosynthesis, and ribosome synthesis were significantly altered when NP-exposed algae were incubated with nZVI. In contrast to high nZVI concentrations, adding a small concentration of nZVI led to reduced toxicity in NP-exposed algae, while significantly enhancing the NP removal rate. This study improves our understanding of algal responses to various pollutants and suggests that nZVI may assist in the remediation of NP in aquatic ecosystems.
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高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-15
·
IF 14.919
Chen Junjie,Chen Longqi,Wu Yinglong,Fang Yichang,Zeng Fang,Wu Shuizhu,Zhao Yanli
Developing high-quality NIR-II fluorophores (emission in 1000–1700 nm) for in vivo imaging is of great significance. Benzothiadiazole-core fluorophores are an important class of NIR-II dyes, yet ongoing limitations such as aggregation-caused quenching in aqueous milieu and non-activatable response are still major obstacles for their biological applications. Here, we devise an activatable nanoprobe to address these limitations. A molecular probe named BTPE-NO 2 is synthesized by linking a benzothiadiazole core with two tetraphenylene groups serving as hydrophobic molecular rotors, followed by incorporating two nitrophenyloxoacetamide units at both ends of the core as recognition moieties and fluorescence quenchers. An FDA-approved amphiphilic polymer Pluronic F127 is then employed to encapsulate the molecular BTPE-NO 2 to render the nanoprobe BTPE-NO 2 @F127. The pathological levels of H 2 O 2 in the disease sites cleave the nitrophenyloxoacetamide groups and activate the probe, thereby generating strong fluorescent emission (950~1200 nm) and ultrasound signal for multi-mode imaging of inflammatory diseases. The nanoprobe can therefore function as a robust tool for detecting and imaging the disease sites with NIR-II fluorescent and multispectral optoacoustic tomography (MSOT) imaging. Moreover, the three-dimensional MSOT images can be obtained for visualizing and locating the disease foci.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Tong Liu,Zhican Xie,Peng Zhou,Zhaokun Xiong,Heng Zhang,Zhicheng Pan,Yang Liu,Bo Lai
Transition metal activation of sulfite (S(IV)) is a promising wastewater treatment technology . In this study, the activation of potassium pyrosulfite (PPS) with ferric iron (Fe 3+ ) is proposed firstly to degrade carbamazepine (CBZ). PPS has the advantages of low cost, non-toxicity and acidic solution, which makes it unnecessary to adjust the pH. The results showed that the Fe 3+ cycle was realized during the reaction process, and the degradation trend of CBZ was consistent with the formation rate of Fe 2+ and the decay rate of S(IV). Moreover, oxygen (O 2 ) plays a decisive role in the system and was the initiator of free radical chain reactions. The existence of sulfite radical (SO 3 •− ), sulfate radical (SO 4 •− ) and hydroxyl radicals (HO • ) in Fe 3+ /PPS system was proved by electron paramagnetic resonance (EPR), quenching experiments and terephthalic acid (TA) photoluminescence probing technique. The contribution of SO 4 •− and OH • to the removal of CBZ in Fe 3+ /PPS system is 64% and 35%, respectively. In addition, intermediates of CBZ were identified by Liquid Chromatography–Tandem Mass Spectrometry (LC–MS/MS) and possible removal pathways were also proposed. Finally, the effects of PPS concentration, Fe 3+ concentration, initial pH, anions and humic acid (HA) were also investigated.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Silan Zhao,Lifang Gong,Guangzhao Guo,Huimin Liu,Shuai Li,Lu Dong,Shuang Deng,Hongyun Hu
A large number of fly ash samples from mechanical grate furnaces at a municipal solid waste incineration (MSWI) plant were examined including Se speciation and content. Se leaching behaviors before and after solidification/stabilization(S/S) treatment were comparatively studied. The results showed that Se in the MSWI fly ash was present mainly in the form of selenite with small amounts of physically adsorbed SeO 2 (s). Se in the low alkalinity ash (pH ∼ 7) tended to be more leachable than that in the high alkalinity ash (pH ∼ 12). The chelation treatment would further raise the risk of Se leaching into the environment from the low alkalinity ash (pH ∼ 7). Three Fe-containing additives (zero-valent iron (ZVI)、α-Fe 2 O 3 and Fe 3 O 4 ) were introduced, respectively in attempt to immobilize Se in the low alkalinity MSWI fly ash. A strong positive effect was found with ZVI addition in terms of Se leaching from low alkalinity chelated MSWI ash. Comparatively, iron oxides showed no obvious effect. The adjustment to ash alkalinity (CaO addition) exhibited a comparable effect to ZVI addition, which provided another option to control Se leaching from low alkalinity chelated ash.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
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IF 8.7
Shengjie Chen,Fubing Yao,Zhoujie Pi,Li He,Kun Luo,Xiaoming Li,Qi Yang
Salts including NaCl are the most common food flavoring agents so they are often accumulated in food waste (FW) and have potential impact on anaerobic digestion (AD) of FW. In this study, the enhanced biogas production from two-stage anaerobic digestion (TSAD) of FW by microscale zero-valent iron (ZVI) under different salinity (3, 6, 9, and 15 g NaCl/L) was evaluated. Under salinity stress, ZVI becomes a continue-release electron donor due to the enhanced corrosion and dissolution effect and the slow-down surface passivation , further improving the performance of TSAD. Experimental results revealed that the biogas production including H 2 and CH 4 from TSAD with 10 g/L ZVI addition was promoted under salinity stress. The maximum H 2 and CH 4 yield (303.38 mL H 2 /g-VS and 253.84 mL CH 4 /g-VS) were observed at the salinity 9 g NaCl/L. Compared with that of zero salinity, they increased by 40.94% and 318.46%, respectively. Additionally, Sedimentibacter , an exoelectrogen that can participate in the direct interspecies electron transfer , also exhibited the highest relative abundance (34.96%) at the salinity 9 g NaCl/L. These findings obtained in this study might be of great importance for understanding the influence of salinity on the enhanced AD by ZVI.
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高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Zhiguo Chen,Wenqing Cao,Yan Li,Jingpeng Song,Yiyun Liu,Juncheng Liu,Rong Zhang,Rongxin Su,He Bai
The remediation of the chlorinated organic compounds via zero-valent iron (ZVI) and microorganisms coupling method in the groundwater has received increasing attention and research. However, the addition of external microorganisms has poor adaptability in complex environmental applications, and ZVI is easily inactivated and has weak long-term degradation performance in the environment. The existing modification preparation of ZVI modified materials seem relatively lacking economical and environmentally friendly methods. This study obtained a new type of highly efficient degradation bacterium BL5, and introduced an economical and simple method for preparing the functional CS@ZVI biological stimulation materials. The performances of CS@ZVI-BL5 systems for the removal of TCE, chloroform , 1,2-dichloroethane, and chlorobenzene were all reached 100 % after 12 days, which was significantly improved the degradation efficiency by the CS@ZVI or BL5 (95.65 %, 93.64 %, 90.54 %, 88.85 %) alone. This is the first method that extracted and screened an autochthonous high-efficiency degrading bacterium from contaminated sites, and developed a biological stimulation material to improve the remediation. Here we demonstrate that the modified CS@ZVI with BL5 microorganisms synergistically enhanced the degradation performance.
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ENERGY & FUELS
·
2023
·
IF 5.3
Xianhang Jin,Enze Ren,Min Zheng,Xiurong He,Yun Yang
A CO2 phase change absorbent (CPCA) is of interest because it has the potential to reduce energy consumption for CO2 capture. Controllable phase separation behavior was expected in the development and application of a CPCA. In this study, the effects of CO2 loading under different activators and physical solvents on the phase separation behavior of an activated methyldiethanolamine (MDEA)-based CPCA were investigated. By adjustment of the CO2 loading, controllable phase separation behavior was achieved and the absorbent comprising an activator with more −NH– groups and a physical solvent with low ET(30) was favored to exhibit phase separation. Of special interest was that, with the increasing of CO2 loading, phase behaviors, from the liquid phase to solid–liquid phase and then to the liquid phase, were observed for CPCA comprising MDEA/piperazine (PZ)/N-methyl-2-pyrrolidone (NMP), which was different from all of the other known CPCAs. The solid compound was identified as PZ carbamate by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and elemental analysis, and the liquid-phase samples were detected by 13C nuclear magnetic resonance (NMR). The phase change mechanism of this special phenomenon was proposed.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Guang-En Yuan,Yan-Ge Ma,Yunjie Qin,Yanbin Wang,Yunbei Li,Xin Zhang,Fenglin Yang
Zero-valent iron (ZVI) is widely used in the field of wastewater treatment and groundwater remediation, but it suffers from low reactivity due to the surface passivation layer. In the present work, bisulfite was used as an additive to enhance the reduction activity of ZVI under anoxic conditions. It was found that the reaction kinetic constant of p-nitrophenol reduction in ZVI/bisulfite process was approximately 132 times higher than that by ZVI alone. Bisulfite could dissolve and reduce some iron oxide on the ZVI surface, resulting in the exposure of more active sites like Fe 0 and Fe(II) for p-nitrophenol reduction through direct electron transfer. Common substances in water had no effects on p-nitrophenol degradation by ZVI/bisulfite process, but phosphate suppressed ZVI corrosion seriously. This work provides a simple, cost-effective and environmental-friendly method to improve the reducing activity of ZVI under anoxic conditions.
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高影响因子
TETRAHEDRON
·
2023
·
IF 2.1
Fuying Zhu,Yamei Lin
Herein, we report a low-metal iron-supported (0.06 wt%) catalyst (Fe20/NC-Mg), in which the FeN x site and Mg(OH) 2 nanorods are synergistic to achieve the efficient synthesis of quinoxaline (16 examples, 82–91 % yield) with water as a solvent and without additional bases. Moreover, the industrial application potential of Fe20/NC-Mg is demonstrated by gram-level synthesis and reusability of catalysts after four cycles. This protocol has high atomic and step economy, which meets with the requirement of green synthesis.
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Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 15
·3716-3726
·
IF 5.6
Wansi Lin,Yue Wang,Junhua Zhang,Huai Liu,Lincai Peng
Lignin is a highly abundant biopolymer next to only cellulose, and its transformation into high value-added products is always of interest. It is well known to contain bounteous hydroxyl groups, which can act as natural organic ligands to assemble metal catalysts. Herein, lignin was selected to assemble well-dispersed Zr nanoparticles in polyacrylonitrile nanofiber by electrospinning technology (ZrNPs-lignin/PAN). Systematic characterizations revealed that lignin promoted the coordination between zirconium ions and PAN nanofibers to generate Lewis acid and Lewis base sites. The abundant Lewis acid–base sites confer the composite with remarkable catalytic activity in the transfer hydrogenation (TH) of furfural (FAL) into furfuryl alcohol (FOL), and a quantitative yield of 95.9% with a high TOF of 15.1 h−1 was obtained under mild conditions. ZrNPs-lignin/PAN exhibited good recycling stability and excellent universality in the CTH of a diverse array of carbonyl chemicals into their corresponding products.
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