ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 22
·18640-18650
·
IF 2.741
Chen Yuan,Lei Xin,Dou Rongni,Chen Yuancai,Hu Yongyou,Zhang Zhiqi
A water-compatible magnetic triclosan (TCS) imprinted material (TCS-CTS-Fe 0 -MIPs) was synthesized for selective enrichment and detection of TCS in real complex water samples. The material was synthesized by using chitosan (CTS) as functional monomer, which has rich surface O- and N-containing functional groups. The TCS imprinted CTS was coated on Fe 0 surface and then cross-linked with glutaraldehyde. Scanning electron microscopy suggested that the imprinted material was covered with a layer of imprinted film, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirmed that the imprinted material had more functional groups (amino and hydroxyl groups) than that of non-imprinted material. The TCS imprinted and non-imprinted materials used in each adsorption experiments were 0.1 mg mL −1 . The maximum adsorption capacity of the TCS imprinted material and non-TCS imprinted material were 20.86 and 15.11 mg g −1 , respectively. The adsorption results showed that selectivity coefficient was 10.151, 1.353, and 8.271 in the presence of p-chlorophenol, 2,4,6-trichlorophenol, and bisphenol-A, respectively. The recoveries of river water and lake water samples were 92.8, 91.3, 92.4, and 81.4, 82.3, 82.1%, respectively, when the samples were spiked with 4, 6, and 8 μg L −1 of TCS with the imprinted material. The adsorption capacity of the TCS imprinted material and non-TCS imprinted material lost 5.2 and 6.2% after six times of recycling. The high selectivity and excellent adsorption capacity of the imprinted material can be attributed to the presence of sterically complementary imprinted sites and high surface, which would also made it more accessible to TCS than that of non-imprinted material. The present study would provide an environmental friendly and convenient method for the removal and the monitoring of TCS in environmental water samples.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2025
·
IF 8.9
Yabin Zhang,Jiaming Wang,Xuedong Wu,Linyan Zhu,Wenguang Zhang,Lishuai Zong,Jinyan Wang,Xigao Jian
The robust operation of electromagnetic waves in communication systems with extreme temperatures relies on high-temperature resistant wave-transparent composites, with organic resin matrix being a pivotal constituent. Enhancing the heat resistance of resins while maintaining excellent processability poses a significant challenge. Herein, a novel “rigid-in-flexible” self-curing silicon-based silicon-based phthalonitrile monomer containing phenylacetylene backbone (Si-ALK-PN) was designed. The silazane component disrupts the crystallinity in Si-ALK-PN, resulting in a characteristic of low viscosity (0.3 Pa·s) and extended processing window (>3h). After curing at 450 °C, the resin, namely Si-ALK-PN-450 °C, demonstrated exceptional thermal stability ( T 5% = 631 °C) and thermo-oxidative stability ( T 5% = 560 °C). Their quartz fiber-infused composites (Si-ALK-PNs/QF) were manufactured through a straightforward melt processing approach. Upon post-curing at 450 °C, Si-ALK-PN-450 °C/QF exhibited elevated glass transition temperature, flexural strength, and consistent dielectric properties across a wide temperature ranging from 25 °C to 600 °C. Especially, it exhibited excellent flame retardancy as well, stemming from release of eco-friendlyeco-friendly inert gases (NH 3 ) and the high thermal stability of N-enriched all-aromatic PN resin. The design concept of “rigid-in-flexible”, along with the multi-functional group co-curing strategy, offers a promising solution for addressing the trade-off between processing and heat resistance in resins, extending beyond PN resins.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Jiawen Hu,Linwen Jiang,Jiawei Jin,Hang Liu,Anhua Wu,Xiaofeng Zhang
High-entropy alloys (HEAs) are important candidates for efficient electromagnetic-wave absorbing (EMA) materials, but the further design of HEA absorbers with harmonized impedance matching and excellent environmental stability remains a major challenge. In this study, a novel carbonitriding process based on a mechanochemical method is employed to prepare carbonitrided FeCoNiMn HEAs by utilizing a cyano-compound (C3H2N2) as a source of C and N. The introduction of C and N effectively optimizes the permittivity of FeCoNiMn HEAs, achieving the equilibrium of electromagnetic matching and thus improving the EMA performances (especially the bandwidth). The carbonitrided FeCoNiMn HEAs exhibit significant reflection loss (RL) and absorption capability. FeCoNiMnM0.04 achieves a minimum RL of −65.8 dB at 3.44 GHz. FeCoNiMnM0.08 achieves an ultra-broad effective absorption bandwidth (EAB) of up to 7.76 GHz at 1.62 mm, covering the entire Ku-band. In addition, the carbonitrided FeCoNiMn HEAs exhibit excellent corrosion resistance and good mechanical properties, ensuring their suitability for harsh environments. This study highlights the potential of carbonitrided HEAs prepared using a cyano-compound as highly efficient EMA materials, and provides a reference for optimizing the electromagnetic matching of HEAs.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Qian Zuo,Bing Li,Zhiyi Deng,Xiangyu Zheng,Ping Li,Jinhua Wu
Zero-valent iron (Fe 0 ) is widely packed in filters for Cr(VI) removal, but it suffers from ferrochrome precipitate passivation. In this study, a mixed Fe 0 and biochar (BC) system was established and investigated for promoted Fe 0 corrosion and enhanced Cr(VI) removal through iron‑carbon micro-electrolysis (IC-ME) by batch and column experiments with Fe 0 and BC as controls. Due to electrochemical reaction between Fe 0 and BC, there was an enhancement in iron corrosion and subsequent formation of secondary minerals on Fe 0 surface. These minerals included magnetite, lepidocrocite, and goethite, which facilitated Cr(VI) adsorption and reduction. The Fe 0 -BC system therefore obtained a higher Cr(VI) removal rate of 86.3 % within 6 h than those of the BC (7.9 %) and Fe 0 (12.5 %) systems. Chromium species distribution showed that 76.2 % of removed Cr(VI) was converted to Cr(III). The resultant Cr(III) of 68.4 % was immobilized on Fe 0 and BC surfaces due to precipitation and sequestration. The optimal Fe/BC mass ratio was 2:1 for galvanic reaction and Cr(VI) removal. The removal of Cr(VI) by Fe 0 -BC exhibited a pH-dependency, with acidic conditions favoring higher removal rates. Additionally, the column experiment result revealed that Cr(VI) removal capacity of 4.0 mg Cr(VI)/(g Fe 0 ) and operational lifespan of 1851 PV in the Fe 0 -BC column were 6.7 and 3.9-fold greater than those in the Fe 0 column, further confirming that galvanic reaction could effectively alleviate Fe 0 surface passivation. These results indicated that mixed Fe 0 and BC as an effective medium in filter tanks could form IC-ME to enhance Cr(VI) reduction and immobilization during water treatment.
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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 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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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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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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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 48
·2412319
·
IF 27.4
Xitang Qian,Yuxiang Lyu,Siyu Zhou,Yican Qiu,Yan Sun,Yuan Yuan,Minhua Shao
Metal sulfides are increasingly favored as cathode materials in all-solid-state batteries (ASSBs) due to their high energy density, stability, affordability, and conductivity. Metal sulfides often exhibit capacities exceeding their theoretical limits, a phenomenon that remains not fully understood. In this study, it reveals that this phenomenon is primarily due to the sulfur decomposition from sulfide-based electrolyte. By employing the high-energy ball milling (HEBM) technique, the deposition of sulfide-based electrolyte onto sulfur is intentionally promoted, resulting in higher charge capacities compared to the discharge capacities and surpass theoretical limits of metal sulfides. Using chromium sulfide (Cr 2 S 3 ) as the active material, the sulfur decomposed from sulfide-based electrolyte transforms into lithium sulfide (Li 2 S) after discharge, resulting in an increased capacity by ≈439.6 mAh g −1 and improved cycling stability. Consequently, it demonstrates a specific capacity surpassing 1200 mAh g −1 with a capacity retention of over 80% after 650 cycles, maintaining cycling stability for more than 1900 cycles and achieving a Coulombic efficiency exceeding 99.9%. This versatile HEBM approach enables the fabrication of ASSBs utilizing various transition metal sulfides, such as molybdenum disulfide (MoS 2 ), niobium disulfide (NbS 2 ), and iron disulfide (FeS 2 ), all exhibiting over theoretical limited capacities and prolonged cycling capabilities.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Yumeng Qi,Wenqian Cao,Ying Zhang,Ruijuan Qu,Rehab Khaled Mahmoud,Mostafa R. Abukhadra,Zongli Huo,Feng Zhu
The present study systematically investigated the elimination of benzalkonium chloride (BAC) in the zero valent iron activated persulfate (Fe 0 /PS) system. The influence of operational parameters, including PS concentration, Fe 0 dosage and pH, were investigated through a series of kinetic experiments. When the Fe 0 dosage was 5.0 mM, the initial ratio of [PS]: [BAC] was 10:1, the degradation efficiency could achieve 91.7% at pH 7.0 within 60 min. Common inorganic anions and humic acid did not significantly affect BAC degradation, implying that Fe 0 /PS system had a potential application prospect in the actual wastewater remediation. Based on the electron paramagnetic resonance test and quenching experiments, the BAC degradation was found to be contributed by •OH, SO 4 • - and Fe(IV). A total of 23 intermediates were identified by the liquid chromatography-mass spectrometry, and the degradation pathways were proposed accordingly, including dealkylation and demethylation, hydroxylation, sulfate substitution and benzyl C-N cleavage reactions. Density functional theory based calculations were conducted to realize the rationality of the proposed reaction mechanisms. The toxicity of transformation products was predicted by ECOSAR program. This work demonstrated the possibility of BAC removal in hospital and municipal wastewater by Fe 0 /PS treatment, and also provides a safe choice for deep treatment of quaternary ammonium salt wastewater.
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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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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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危险品化学品经营许可证（带存储）