Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Lingjie Liu,Shaoqing Mo,Shaopo Wang,Jing Chang,Jianhui Zhao,Jingjie Yu
Low temperatures were a critical factor that inhibited anaerobic ammonium oxidizing bacteria (AnAOB) activity. This study demonstrated the effect of exogenous zero-valent iron (ZVI) on Anammox-hydroxyapatite (HAP) system at 17°C. The results showed that long-term addition of ZVI increased the system nitrogen removal efficiency by 8.59% and alleviated the inhibition of AnAOB by low temperature. After addition of ZVI, the activity of AnAOB and the heme c content increased by 58.20% and 4.83%, respectively. Moreover, the functional enzyme activities of NIR, HZS, and HZO increased by 94.12%, 36.36%, and 16.67%, respectively. The concentrations of quorum sensing molecules, i.e., C 6 -HSL and C 8 -HSL, increased by 191.17% and 41.54%, respectively, after ZVI addition. Metagenomic analysis revealed that the addition of 5 g/L ZVI stimulated the relative abundance relative abundance of Fe(II) metabolism-related genes in AnAOB at 17 °C, thereby contributing to the uptake, transport, utilization, and storage of Fe(II). The addition of ZVI could improve the nitrogen removal performance of the anammox-HAP system at the low temperature.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2024
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IF 3.7
Hongyuan Sun,Rui Tang,Kuizu Su,Shoujun Yuan,Jingwei Feng,Wei Wang,Zhen-Hu Hu
Anaerobic digestion (AD) is widely used for the treatment of pig manure, but is easily suffered from ammonia inhibition. The residual pathogenic bacteria and antibiotic resistance genes in the digestate pose potential risks to human health and the environment. Zero-valent iron (ZVI) addition in AD has been extensively investigated to enhance AD performance, but little is known about the impacts of ZVI addition on ammonia inhibition and the digestate biosafety. In this study, the effect of ZVI addition on ammonia inhibition alleviation and reduction of fecal indicator bacteria and antibiotic resistance genes in AD of pig manure and its mechanisms were investigated. ZVI addition at 10 g/L effectively alleviated ammonia inhibition and promoted a shift in dominant methanogens, improving the tolerance of AD systems to high concentration of ammonia. Interestingly, ZVI addition within 5–20 g/L significantly enhanced the reduction of total coliforms, Enterococci and tetracycline resistance genes in the digestate, which was due to the generation of ferrous ions, causing the co-precipitation of suspended solids and indicator bacteria. These results provided valuable insights for the potential application of ZVI addition in the AD of pig manure.
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Foods
·
2025
·Vol. 14
·期 4
·696
·
IF 5.1
Axiang Liu,Shengjie Zhang,Wentao Wang,Hanxue Hou,Yangyong Dai,Cheng Li,Hui Zhang
Arabinoxylan (AX), an abundant and highly valuable component in wheat bran, has its structure and function influenced by the extraction method. A two-step extraction method, involving sequential extraction with a dilute alkali followed by a concentrated alkali–urea mixture, was employed to extract AX from wheat bran. This approach aimed to obtain AX with a high phenolic acid content while achieving a relatively high extraction yield. The dilute alkali extraction could effectively retain the phenolic acid content in the AX extract (≤89 μg/g). However, its yield and sugar content were relatively low. In contrast, the alkali–urea extraction could achieve a relatively high yield (≤55%) and sugar content (≤75%). Different pretreatments (defatting, deproteinization, and delignification) were performed before extraction, causing significant changes to the chemical composition and cell wall structural characteristics of destarched wheat bran, which, in turn, affected the yield and composition of the AX extracts. Deproteinization effectively increased the sugar content, phenolic acid content, and overall yield of the extracts. Different pretreatment and extraction methods significantly affected the DPPH radical scavenging rate and Fe2+chelating rate of the AX extracts but had little impact on the ABTS radical scavenging rate. The antioxidant activity of AX extracted using alkali–urea was unexpectedly higher than that extracted using a dilute alkali. This suggests that the antioxidant activity of AX does not entirely depend on its phenolic acid content but is influenced by various other factors.
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International Journal of Environmental Science and Technology
·
2024
·
IF 3
Yi L.,Li W.,Bu H.,Yin W.,Deng H.,Wu J.
Humic acid, nitrate, and sulfate in the environment may affect the performance of abiotic and biotic zero-valent iron (Fe 0 ) on the remediation of heavy metal-contaminated soil. In this study, a synergistic system combining Fe 0 and microbes was established to remediate Cr(VI)-contaminated soil at low and relatively high concentrations of humic acid, nitrate, and sulfate with Fe 0 as a control. In the abiotic Fe 0 system, humic acid inhibited Cr(VI) removal by occupying iron surface with its oxygen-containing functional groups and generating iron or calcium-containing precipitates on Fe 0 surface. However, microbes could effectively degrade humic acid to promote their growth, iron corrosion, and secondary mineral production for enhanced Cr(VI) removal. As for nitrate, it showed slightly promoted effect on iron corrosion in abiotic Fe 0 , but competed with Cr(VI) for cathodic hydrogen from iron corrosion for biological denitrification and thereby significantly inhibited Cr(VI) removal in biotic Fe 0 . Different from denitrification, hydrogenotrophic desulfuration promoted active mineral generation such as iron sulfide and green rust owning to biomineralization. These minerals were beneficial for Cr(VI) adsorption and reduction. Thus, in the biotic Fe 0 system, the presence of 10 mmol kg −1 sulfate led to a higher Cr(VI) removal of 79.5% as compared to that of 48.4% in the system without sulfate. The results indicated that it is necessary to deeply understand the potential effects of organic substrates and electron acceptors on Cr(VI) removal in soil when using abiotic and biotic Fe 0 before their application.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Haowen Zou,Wenqiang Xu,Shuaixuan Ying,Shichao Cai,Bo Chen,Ping Wang,Zhongkuan Wu,Feng He
Mechanochemically sulfidated microscale zero valent iron (S-mZVI bm ) exhibits promising Cr(VI) removal performance but is prone to be passivated by Cr(VI), how to mitigate the passivation is still a challenge. In this study, we successfully synthesized phthalic acid (PA, carboxyl-rich organic acid) modified S-mZVI bm particles (PA-S-mZVI bm (4:1)) through ball milling. The pre-corrosion of the ZVI surface by PA effectively increased the specific surface area of ZVI. Additionally, the carboxyl groups complexed with Cr(VI), thereby enhancing its Cr(VI) removal capacity and alleviating the passivation. The Cr(VI) removal by PA-S-mZVI bm (4:1) was mainly a chemisorption process on the surface and its Cr(VI) removal capacity (55.47 mg/g) was 1.26 and 9.94 – 14.83 times that of PA-mZVI bm and S-mZVI bm , respectively. The electron efficiency of Cr(VI) removal by both PA-S-mZVI bm (4:1) and S-mZVI bm was ∼100 %, however, the Fe(0) utilization efficiency of PA-S-mZVI bm (4:1) was at least 15 times higher than that of S-mZVI bm , explaining the superior performance of PA-S-mZVI bm (4:1). This study confirmed that PA modification could effectively mitigate the passivation and improve the Fe(0) utilization efficiency of S-mZVI bm .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Renpeng Du,Zimuran Yimuran,Huayang Cai,Bosen Zhou,Yingying Ning,Wenxiang Ping,Baojiang Jiang,Jingping Ge
The interest in nanocomposite films incorporating edible ingredients and active nanoparticles has surged due to their potential to enhance food quality and prolong shelf-life. This research focused on developing innovative exopolysaccharides (EPS)/potato starch (PS) nanocomposite films integrated with g-C 3 N 4 and AgNO 3 . Extensive analysis was conducted to assess the microstructure, physical attributes and antimicrobial properties of these films. Fourier transform infrared (FT-IR) analysis revealed electrostatic and hydrogen bonding interactions within the film components. X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS) data indicated a high level of compatibility among EPS, PS, g-C 3 N 4 , and AgNO 3 , with no new absorption peaks or characteristic signals of C 3 N 4 and Ag appearing in the nanocomposite films patterns. The thickness, water solubility and water vapor permeability (WVP) of the EPS-PS-C 3 N 4 -Ag nanocomposite film increased due to the addition of g-C 3 N 4 , reached 0.31 ± 0.03 nm, 36.61 ± 1.76 % and 1.42 ± 0.34 × 10 −10 g −1 s −1 Pa −1 , respectively. While transparency, swelling degree, and oxygen permeability (OP) significantly decreased, reached 26.18 ± 2.38 %, 63.01 ± 2.51 % and 41.98 ± 1.28 %, respectively. Scanning electron microscopy (SEM) and atomic force microscope (AFM) images depicted an augmented roughness and porosity on the film surface upon integration of g-C 3 N 4 and AgNO 3 . Moreover, the EPS-PS-C 3 N 4 -Ag nanocomposite film displayed enhanced mechanical strength due to the presence of g-C 3 N 4 . The melting temperature (Tm) of EPS-PS-C 3 N 4 -Ag nanocomposite film was 313.3 °C, the removal rates of DPPH and ABTS was 66.11 ± 2.87 % and 45.09 ± 1.23 % respectively. Significant inhibition of microbial growth was observed in film containing g-C 3 N 4 and AgNO 3 , which demonstrated no toxicity towards NIH-33 cells, suggesting their potential application as promising active packaging material for food preservation.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Cheng Qin,Yumeng Qi,Qing Zheng,Xiaolei Teng,Ahmed A. Allam,Ahmed Rady,Zunyao Wang,Ruijuan Qu
In this study, we conducted a systematic study of bisphenol AF (BPAF) removal by visible light coupled zero valent iron activated persulfate (Vis/Fe 0 /PS) system. The results showed that in Fe 0 /PS system, the removal rate of BPAF increased by 46.4% with the addition of Vis. New mechanisms were proposed: that PS became excited under Vis irradiation, which favored its reaction with Fe 2+ to produce more free radicals. Moreover, Fe 3+ could form complex with mono-hydroxylated and mono-carboxylated intermediate of BPAF, and the photoinduced ligand-metal charge transfer (LMCT) process could effectively transfer the charge to the metal ion, accelerating the reduction of Fe 3+ to Fe 2+ to enhance the generation of free radicals. The generation of hydroxylation products of bisphenol AF in the Vis/Fe 0 /PS system was greatly increased compared to the Fe 0 /PS system. The Vis/Fe 0 /PS system had a great application prospect, as it reduced the economic cost of treating bisphenol AF by at least 49.5% compared to other methods. Moreover, 99.6% of bisphenol AF was degraded after 45 min of reaction under natural light. Findings of this study provides new insights into the synergistic role of Vis in Fe 0 /PS systems and may advance the practical application of Vis/Fe 0 /PS system in water and wastewater treatment.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jinfeng Chen,Yi Tang,Xinyan Chen,Junlan Chen,Zhang Yan,Xiao Yao,Hongyu Zhang,Yanyan Pei,Zhuwu Jiang
The escalating presence of antibiotic contaminants in wastewater presents substantial environmental and public health challenges, primarily due to their role in the proliferation of antibiotic resistance genes (ARGs). This study examines the effectiveness of a hybrid system integrating nano zerovalent iron (nZVI) and layered double hydroxides (LDH) in treating wastewater contaminated with ciprofloxacin (CIP). Reactor experiments revealed that incorporating nZVI@LDH mitigated the shock caused by CIP while sustaining a methane production rate that was 116 % higher than that of the control group. Furthermore, there was a 50 % increase in CIP removal efficiency. Notably, there was a significant enrichment of hydrogenotrophic methanogens, such as Methanobacterium and Methanolinea , in the nZVI@LDH-enhanced reactors. Additionally, the levels of reactive oxygen species decreased by 50 %, from 11,813 ± 1230 to 4525 ± 1030 counts/s, and the abundance of ARGs declined by 75–88 % compared to the control reactors. An external electric field further promoted electron transfer, boosting the relative abundance of electrochemically active bacteria, with Proteobacteria comprising up to 40 % of the microbial community in the 1 V + nZVI@LDH reactor. This hybrid system demonstrates significant efficacy in degrading CIP and decreasing ARGs generation, underscoring its potential as a sustainable strategy for managing antibiotic-laden wastewater.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Yinghao Shi,Dong Wang,Jiaming Guo,Feilong Gao,Linan Liu,Jingchun Tang
The performance optimization of zerovalent iron (ZVI) based materials for reductive dechlorination is critical but remains challenging. Combining the advantages of bimetallic and heteroatomic modification may lead to a novel strategy for reductive dechlorination of chlorinated ethenes (CEs) pollution. In this study, three different types of dual-modified micron ZVI (mZVI) composite particles, namely, pre-bimetallic modified mZVI (Ni/mZVI-N), pre-nitrogen modified mZVI (N/mZVI-Ni), and simultaneously modified mZVI (Ni/N-mZVI), were prepared by adjusting the order of ball milling modification of nickel and melamine, in which ball milling mechanical-chemical interactions contributed to the generation of enriched M-N structures. In terms of combined reactivity and selectivity, Ni/N-mZVI exhibited the best performance, with trichloroethylene (TCE) dechlorination rate ( k o b s , T C E ) and electron efficiency ( ε e ) of 0.14 h −1 and 8.9 %, respectively, which were 10.7 and 7.5 times higher than those of mZVI. The distribution and percentage of degradation products further illustrated the reductive dechlorination of nickel-nitrogen dual-modified mZVI via both electron transfer and atomic hydrogen (H*) pathways. A series of characterization and mechanistic analyses showed that the enhancement of TCE reductive dechlorination performance could be attributed to the combined effect of Fe−N to accelerated electron transfer and Ni-N to enhance catalytic hydrogenation. In addition to decreased H 2 accumulation, Ni/N-mZVI reduced leaching ions thus mitigating secondary contamination. This double-modification strategy employed to enhance the optimization of mZVI for groundwater remediation establishes a foundation for ongoing progress in the synthesis of reactive materials.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shuchen Wang,Kai He,Yuanfang Lai,Feng He
The reductive capacity of zero valent iron (ZVI) is extremely restricted by the surface passivation. To address this issue, ball-milling lignosulfonate modified ZVI (LS-ZVI) was prepared and used to determine the reactivity, electron utilization efficiency and application feasibility towards nitrobenzene (ArNO 2 ) removal. The results showed that LS-ZVI could completely remove ArNO 2 within 40 min with aniline conversion percentage of ∼95%, while ArNO 2 reduction by ZVI was negligible within 180 min. Electrochemical evidence, H 2 production, and characterization analysis collectively illuminated that the enhanced ArNO 2 reduction by LS-ZVI was attributed to the increased Fe 0 exposure that endowed it with excellent electron transfer ability. The inhibited H 2 production indicated that the electron utilization efficiency of LS-ZVI towards ArNO 2 was close to 100%. Moreover, ArNO 2 removal was slightly inhibited under higher solution pH. Except for the obvious inhibitory effect of high concentration NO 3 − , the effects of co-existing ions (Cl − , NO 3 − , SO 4 2− , Ca 2+ , and Mg 2+ ) were little. The presence of Ni(II) had a negligible effect on ArNO 2 removal, while high concentration of Cd(II) and Cr(VI) could obviously inhibit ArNO 2 reduction. In addition, the excellent reusability of LS-ZVI and the complete ArNO 2 removal in groundwater suggested the feasibility of LS-ZVI in practical field remediation.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Guolin Yang,Ling Wei,Xin Wang,Xudong Wu,Yizhou He,Guo Li,Tao Chen,Wenkun Zhu
The zero-valent iron (ZVI) has attracted increasing attention due to the enhanced reactivity of ZVI to uranium wastewater. However, ZVI practical application is hampered due to its susceptibility to oxidation and the formation of passivation layers during storage and in situ restoration. To address these issues, we used a biosulfuration approach to modify ZVI for application in uranium ore wastewater treatment. A series of physicochemical characterization tools and photoelectronic analyses showed that BS-ZVI considerably increased carrier separation efficiency and visible light absorption capacity, resulting in a significant photoassisted enhancement effect on uranium extraction. Accordingly, the uranium removal efficiency of BS-ZVI reached 91% within 60 min, and its maximum adsorption capacity was 336.3 mg/g. By analyzing the mechanism, the improved U(VI) removal performance was mostly responsible on the dissolution of the passivation layer on the surface of ZVI, the generation of Fe(II) and FeS, and the important role of Shewanella putrefaciens extracellular polymers (EPS). Overall, the BS-ZVI biohybrid merges with the high activity of ZVI, bio-FeS, and self-regeneration ability of bacteria, expanding a promising new approach for sustainable treatment of uranium mine wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Guoqing Wu,Hongyu Wang,Lei Huang,Jia Yan,Xuanxuan Chen,Huabing Zhu,Yi Wu,Shumei Liu,Xiaozhen Shen,Weiqi Liu,Xianjie Liu,Hongguo Zhang
The efficient capture of copper ions (Cu 2+ ) in wastewater has dual significance in pollution control and resource recovery. Prussian blue analog (PBA)-based pseudocapacitive materials with open frameworks and abundant metal sites have attracted considerable attention as capacitive deionization (CDI) electrodes for copper removal. In this study, the efficiency of copper hexacyanoferrate (CuHCF) as CDI electrode for Cu 2+ treating was evaluated for the first time upon the successful synthesis of copper hexacyanoferrate/carbon sheet combination (CuHCF/C) by introducing carbon sheet as conductive substrate. CuHCF/C exhibited significant pseudocapacitance and high specific capacitance (52.92 F g −1 ) through the intercalation, deintercalation, and coupling of Cu + /Cu 2+ and Fe 2+ /Fe 3+ redox pairs. At 0.8 an applied voltage and CuSO 4 feed liquid concentration of 100 mg L −1 , the salt adsorption capacity was 134.47 mg g −1 higher than those of most reported electrodes. Moreover, CuHCF/C demonstrated excellent Cu 2+ selectivity in multi-ion coexisting solutions and in actual wastewater experiments. Density functional theory (DFT) calculations were employed to elucidate the mechanism. This study not only reveals the essence of Cu 2+ deionization by PBAs pseudocapacitance with promising potential applications but also provides a new strategy for selecting efficient CDI electrodes for Cu 2+ removal.
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危险品化学品经营许可证（带存储）