ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xuefang Zhao,Hui Xu,Minzhang Chen,Yong Chen,Xiuqing Kong
The degradation of organic pollution by sulfur-modified nano zero-valent iron(S-nZVI) combined with advanced oxidation systems has been extensively studied. However, the low utilization of nZVI and low reactive oxygen species (ROS) yield in the system have limited its wide application. Herein, a natural organic acid commonly found in citrus fruits, citric acid (CA), was combined with the conventional S-nZVI@Ps system to enhance the degradation of norfloxacin (NOR). The addition of CA increased the NOR removal by about 31% compared with the conventional S-nZVI@Ps system under the same experimental conditions. Among them, the enhanced effect of CA is mainly reflected in its ability to promote the release of Fe 2+ and accelerate the cycling of Fe 2+ and Fe 3+ to further improve the utilization of nZVI and the generation of ROS; it also promotes the dissolution of the active substance (FeS) on the surface of S-nZVI to further improve the degradation rate of NOR. More importantly, the chelate of CA and Fe 2+ (CA-Fe 2+ ) had higher reactivity than alone Fe 2+ . Free radical quenching and electron spin resonance (ESR) experiments indicated that the main ROS for the degradation of NOR in the CA/S-nZVI@Ps system were SO 4 •- and OH•. CA-bound sulfur-modifying effects on NOR degradation was systematically investigated, and the degradation mechanism of NOR in CA/S-nZVI@Ps system was explored by various techniques. Additionally, the effect of common anions in water matrix on the degradation of NOR in CA/S-nZVI@Ps system and its degradation of various pollutants were also studied. This study provides a new perspective to enhance the degradation of pollutants by S-nZVI combined with advanced oxidation system, which can help to solve the application boundary problem of S-nZVI.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Juan Wu,Huili Zhang,Hongen Zhang,Ming Qing,Zhenfei Feng,Huayu Hu,Yanjuan Zhang,Lizhe Liang,Zhi Qun Tian,Zuqiang Huang
A novel structural composite (Fe-N/FeS@C) was synthesized via a self-doping strategy by the pyrolysis of a solid mixture of lignosulfonate and ferric nitrate pretreated by mechanical activation. The as-synthesized composite contained 7.5 wt% of single atomic iron moieties and 16.0 wt% of encapsulated FeS nanoparticles , with a high surface area of 1095.81 m 2 g –1 and plentiful micropores and mesopores (0.4–10 nm). The Fe-N/FeS@C composite was confirmed to possess outstanding catalytic activity for sulfite activation in the degradation of methylene blue , with a high reaction rate constant (0.77 g g –1 min –1 ) and long cycling stability (83.1% of initial activity retention after 10 recycles). Moreover, the composite exhibited satisfactory activity recovery via a simple rinsing process with ethanol and HCl , and performed well in a wide pH range of 3–11. Density functional theory calculation results further demonstrated that the reaction energy of the rate-determining step, in which SO 3 •− was produced from SO 3 2– on atomic Fe moieties, was lower than that of the formation of FeSO 3 + by Fe 3+ and SO 3 2– . The excellent performance of Fe-N/FeS@C was mainly attributed to the combination of the high mass loading of active sites of atomic Fe moieties anchored into carbon matrix with encapsulated FeS nanoparticles. This study provides new insight into the development of environment-friendly, stable and atomic dispersion iron composite for sulfite activation to efficiently remove organic pollutants .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Wei Xiang,Hao Chen,Zhenxing Zhong,Chunjie Zhang,Xiejuan Lu,Mingjie Huang,Tao Zhou,Peng Yu,Beiping Zhang
In this study, a novel ultrasound enhanced FeS/persulfate Fenton-like system (US/FeS/PDS) was developed for the synergistic degradation of a typical drug carbamazepine (CBZ) under neutral circumstances. Factors such as FeS dosage, PDS dosage, initial pH and temperature, as well as coexisting anions were investigated. High dosages of FeS and PDS, elevated temperature and acidic circumstances were favorable for the oxidation of CBZ. Presence of HCO 3 − strongly inhibited the CBZ degradation in the US/FeS/PDS system, while slight suppression was observed with either NO 3 − or Cl − . Seven intermediates were identified as the products from the decomposition of CBZ by hydroxyl radicals (OH·) and sulfate radicals (SO 4 − ·). Time-dependent radical examination indicated that homogeneous OH· and SO 4 − · would contribute to the CBZ removal from 22.6 to 34.7% and 12.9 to 50.5%, respectively, while the contribution of solid-liquid interfacial radicals decreased from 64.5 to 20.2%. Meanwhile, the oxidation of S 2− occurred concurrently with reduction of Fe(III) to Fe(II). The reaction mechanism in the US/FeS/PDS system was proposed based on the sonochemical heterogeneous-homogeneous sulfur-iron cycle in the US/FeS/PDS system. US would firstly enhance the interfacial sulfur-iron electron transfer and the disintegration of the passivation layer, and then lead to the overall improvement in both interfacial and bulk sulfur-iron cycle, as well as the degradation of CBZ.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
npj Clean Water
·
2020
·Vol. 3
·期 1
·1-10
·
IF 4.87
Zou Chunzhen,Guo Beibei,Zhuang Xuming,Ren Liying,Ni Shou-Qing,Ahmad Shakeel,Qiao Zhuangming,Cui Zhaojie,Hong Jinglan
The effects of FeS on nitrogen removal performance and microbial community of anammox process were studied. During the start-up period, the removal efficiencies of nitrite and total nitrogen were significantly improved by FeS. The addition of FeS increased the content of iron ions in the reactor and promoted the synthesis of heme c , which was involved in the formation of various enzymes. Compared with the control, the abundance of anammox bacteria in the FeS reactor was increased by 29%, and the expression level of the nirS gene (encoding cd 1 type nitrite reductase containing heme) was nearly doubled. The content of nitrite reductase (ammonia-forming) in the community was increased by 26.4%. The difference in functional bacteria and enzyme contents in the microbial community resulted in a difference in nitrogen removal rate (NRR) between the two reactors. High-throughput results indicated that FeS increased the richness and diversity of microbial community and enhanced the metabolic function of the microbial community. The addition of FeS did not change the dominant position of Ca. Kuenenia in both reactors. But the relative abundance of heterotrophic denitrifying bacteria was reduced with FeS, which may be related to the inhibition effect of S 2− produced by FeS.
研究领域:
环境微生物学
·
污水处理
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Xiangyue Wei,Yixin Pan,Jisheng Kou,Rui Huang
The removal of selenium (IV) from aqueous solutions was the focus of research that led to the discovery of a novel type of composite adsorbent called FeS@h-BN nanocomposite . This adsorbent was studied, characterized, and put to use in a fixed bed column. SEM, FTIR, XRD, and XPS analyses were conducted to learn more about the coated layer's surface properties. The effect of several adsorbent materials on the remediation of Se(IV) in dynamic water was examined. The Adams-Bohart model, the Thomas model, and the Yoon-Nelson model were all utilized to get optimal fits to the kinetic data obtained from the adsorption process. Moreover, the Adams-Bohart model was only applicable to the beginning portion of the dynamic behavior of the FeS and FeS@h-BN columns. The Thomas and Yoon-Nelson models were sufficient for describing the breakthrough curve under all experimental conditions. For this dynamic process, the theoretical breakthrough curve profile was compared to an experimentally derived profile. It was discovered that FeS@h-BN nanocomposites are the most effective at removing Se(IV), and the adsorption of Se(IV) by a variety of adsorbent materials is enough for all three dynamic models.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Penghui Guo,Xiang Gu,Zhaoshuang Li,Xu Xu,Yini Cao,Guoen Yang,Chuntao Kuang,Xingong Li,Yan Qing,Yiqiang Wu
The discharge of heavy metals (HMS) from industrial production has severely damaged the natural environment and human health. To address the challenges posed by heavy metals, a novel almond shell biochar (FeS-CTS@nBC) modified with FeS and chitosan (CTS) was prepared. Scanning electron microscopy and X-ray photoelectron spectroscopy observations revealed a uniform distribution of FeS particles on the biochar. Adsorption thermodynamics experiments showed that the maximum adsorbed amounts of cadmium (Cd), lead (Pb), and chromium (Cr (VI) and Cr (III)) in FeS-CTS@nBC were 85.6, 89.63, 94.2, and 75.62 mg/g, respectively. Results of soil incubation experiments indicated that FeS-CTS@nBC had a desirable immobilization effect on heavy metals, decreasing the bioavailability of Cd, Pb, Cr (VI), and Cr (III) by 29.43 %, 23.93 %, 5.75 % and 5.23 %, respectively. Density functional theory (DFT) calculations, revealed that the oxygen-containing functional groups on the biochar exhibited stronger adsorption capacities for heavy metals. Plant potting experiments indicated that the paddy grew well in the soil remediated with FeS-CTS@nBC. The Cd content in the roots and leaves of the paddy after nBCS2 repair was reduced by 28.01 % and 55.73 %, respectively. Overall, this work provides a promising low-cost method with a simple production process for mitigation of heavy metals from water and soil.
研究领域:
环境科学
·
材料科学
·
植物学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Likang Fu,Wenqi Xiong,Qiming Liu,Shuyun Wan,Chenxia Kang,Gaofeng Li,Jun Chu,Yucheng Chen,Shengjun Yuan
Considering the superior performances of MOF-based and MoS 2 -based materials, a flower-like FeS/MoS 2 composite is synthetized using MIL-100(Fe) as a precursor. Electronic density of states and band structure are simulated by density functional theory (DFT) calculations, which prove that FeS/MoS 2 heterostructure exhibits metallic behavior. Unique structure and powerful hetero-interface synergistic effect of FeS/MoS 2 is conducive to improve the stability of sodium-ion batteries (SIBs). It provides reversible capacities of 464 and 365 mA h g −1 at 0.1 and 1.0 A g −1 . When the current density increases to 5 A g −1 , FeS/MoS 2 delivers a high capacity of 325 mA h g −1 with a capacity retention rate (71.1%). Moreover, it can maintain a stable specific capacity of 331 mA h g −1 at 2.0 A g −1 after 200 cycles. Adsorption energy calculated by DFT indicates that more Na atoms may be trapped on the top of Mo atom between FeS and MoS 2 layers. This study may stimulate the interesting of multivariate-MOFs/ covalent organic frameworks (COFs) composite emerging two-dimensional materials and facilitate the application of composite electrode in high-performance SIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zhanheng Yan,Jiandong Liu,Huan Wei,Xinxin Yang,Yong Yao,Zhongyuan Huang,Huanxin Li,Yafei Kuang,Jianmin Ma,Haihui Zhou
Potassium-ion batteries (PIBs) is one of the most promising alternatives for Lithium-ion batteries (LIBs) due to the low-cost and abundant potassium reserves. However, the electrochemical performances of PIBs were seriously hindered by the larger radius of potassium ions, resulting in a slow kinetic during the electrochemical reaction, especially in the PIB anodes. In the study, we propose FeS nanodots embedded S-doped porous carbon (FeS@SPC) synthesized by a simple self-template method for the storage of potassium-ions. The FeS nanodots with an average diameter of 5 nm are uniformly distributed in S-doped porous carbon nanosheets. When the FeS@SPC was used as the anode in PIBs, the unique structure of FeS@SPC can relieve the agglomeration and volume expansion of FeS effectively during the charge–discharge process. Even after 3000 cycles, the FeS nanodots are still uniformly embedded in porous carbon without agglomeration. Ascribed to the merits, the FeS@SPC exhibits a reversible capacity of 309 mAh g −1 at 0.1 A g −1 after 100 cycles and 232 mAh g −1 at 1 A g −1 after 3000 cycles. The excellent electrochemical performance of FeS@SPC is attributed to the synergistic effects of FeS nanodots and S-doped porous carbon, which facilitated the diffusion of electrolyte and accelerated the migration of potassium ions. Moreover, theoretical calculation results also suggest that the van der waals heterostructure of FeS@SPC displays higher adsorption energy for potassium ions than that of S-doped graphene, indicating the suitability of FeS@SPC for K storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Huaxiao Xie,Pan Deng,Zhentao Zhou,Heng Xiong,Xiumin Chen,Bin Yang,Baoqiang Xu,Huan Yang,Chaosong Meng,Xiaohui Wei
An important way to obtain PbS and FeS is the thermal decomposition of Jamesonite. However, the mechanism of PbS–FeS interaction is unknown. In order to explore the separation effect of PbS and FeS, thermodynamic calculation, dynamic simulation and vacuum distillation experiments were used to explore the interaction mechanism of PbS and FeS. The decomposition and volatilization temperatures of PbS and FeS were obtained by thermodynamic calculation. The difference of saturated vapor pressure indicates that there is a tendency of separation between them. The ab initio molecular dynamics method was used to calculate the density of states of PbS and FeS at different temperatures, indicating that the FeS(114) structure is more stable than the PbS(200) structure, and the Pb–S bond is easier to break than the Fe–S bond at the same temperature. The experimental results of vacuum distillation show that the volatilization temperature of PbS is much lower than that of FeS, and FeS can only volatilize into the gas phase at a higher temperature. The theoretical calculation method is consistent with the experimental results, which shows that the thermodynamic calculation and dynamic simulation methods are reliable in predicting the volatilization and separation of crystal structures. The interaction mechanism between PbS and FeS was explored from the theoretical point of view to provide theoretical guidance for vacuum distillation experiment.
研究领域:
矿物学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hengduo Xu,Yanqing Sheng
SO 4 ●− and ● OH are recognized as valid reactive species in the FeS-activated persulfate system. However, whether other reactive species are generated in this process remains unclear. In this study, a FeS-based peroxymonosulfate (PMS) (FeS/PMS) system was developed for the degradation of chloramphenicol (i.e., chloramphenicol (CAP) and thiamphenicol (TAP)) and fluoroquinolone (i.e., ciprofloxacin (CIP) and norfloxacin (NOR)) antibiotics. In addition to SO 4 ●− and ● OH, Fe(IV) was identified as another reactive species by using methyl phenyl sulfoxide (PMSO) and methyl phenyl sulfone (PMSO 2 ) as probe compounds. Although Fe(IV) participated in antibiotic degradation, the contribution of Fe(IV) was smaller than that of SO 4 ●− due to its low redox potential and weak competition ability. Efficient degradation of antibiotics was achieved in the FeS/PMS system within 120 min using 6 mM PMS and 0.6 g/L FeS at initial pH of 7.0, with removal percentages of 93.5%, 98.5%, 100% and 100% for CAP, TAP, CIP and NOR, respectively. The S 2− acted as an electron donor to facilitate continuous Fe(III) reduction and Fe(II) regeneration. Based on the degradation intermediates of antibiotic, the reaction pathways were proposed to involve side chain cleavage, hydroxylation, denitration, deoxygenation, decarboxylation and dehalogenation. In addition to its performance in simulated waters, the FeS/PMS system also presented effective antibiotic degradation in real surface water. This study provides new insights into the mechanism of multiple reactive species generation in the FeS-activated PMS process and extends the potential engineering applications in antibiotic degradation and in situ water quality remediation.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 7
·876
·
IF 4.9
Eman M. Abd El-Monaem,Jawaher Y. Al Nawah,Mohammed Salah Ayoup,Abdelazeem S. Eltaweil
Herein, a heterogeneous Fenton-like catalyst was designed by immobilizing iron oxide (FeS) and nickel sulfide (NiS) on the surface of β-cyclodextrin (β-CD), creating a NiS/FeS@β-CD composite for degrading triphenylmethane cresol red dye. Varied instruments were used to study the physical and chemical characteristics of the NiS/FeS@β-CD catalyst. The appropriate catalytic conditions of the Fenton-like degradation of cresol red by NiS/FeS@β-CD were identified, clarifying that the higher degradation % fulfilled 99.86% with an adsorption % of 27.44% at a cresol red concentration = 50 mg/L, NiS/FeS@β-CD dose = 0.01 g, pH = 3, processing temperature = 30 °C, H2O2concentration = 100 mg/L, and H2O2volume = 1 mL. The kinetic assessments depicted the preference of the second order to represent the Fenton-like degradation of cresol red by NiS/FeS@β-CD. The mechanistic proposition of the adsorption/Fenton-like degradation of cresol red was understood using a quenching test and XPS analysis. Finally, to confirm the durability of NiS/FeS@β-CD, a reusability test was proceeded on the catalyst for five adsorption/Fenton-like degradation runs, with identifying the leaching concentrations of nickel and iron from the catalyst by ICP-OES after each run.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Ying Cai,Jinhong Fan,Zhigang Liu
This study constructed a FeS-based Fenton-like process to explore the degradation of TTC in the presence of copper ions . The acidic condition of pH 3 was more favorable to the H 2 O 2 decomposition and TTC degradation , and it was slightly enhanced by Cu(II). The production of •OH from H 2 O 2 was revealed through radical scavenging and benzoic acid probe experiments, and the ratio of H 2 O 2 decomposition to •OH production was about 1–1.5, which is comparatively consistent with the theoretical ratio. FeS-based Fenton process was proved to be a homogenous system, the slow release of Fe(II) source and the autocatalytic cycle of Fe(III) to Fe(II) resulting from the reductive species of TTC and dissolved S(-II) improved the production of •OH and the degradation of TTC, which was proved by comparing TTC degradation, TOC removal, H 2 O 2 decomposition and Fe(II) concentration with different iron sources (FeS, Fe(II) and Fe(III)) and external addition of dissolved S(-II). The possible degradation pathways of TTC were subsequently inferred according to the detected products by LC-MS. Understanding these autocatalytic processes is essential to reveal the transformation of redox-active substances in environments and may have potential significance in applying FeS-based Fenton-like process for the treatment of wastewater containing reductive organic matters.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）