ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Wang Lanbin,Chen Yu,Xu Yangming,Ma Yanping,Du Yaguang
With the shortage of high-quality raw materials and increasingly strict environmental regulations, the recovery of metals from copper slag and pyrolusite has become a research hotspot. A novel method for simultaneously extracting Mn and Fe from pyrolusite and copper slag has been proposed. Under the optimal conditions (Copper slag / Pyrolusite = 2, H 2 SO 4 = 2 M, liquid—solid ratio = 10, T = 90 ℃, holding time = 60 min), the leaching efficiencies of Mn and Fe can reach 98.28% and 99.04%, respectively. In addition, the treated residue containing 60.04 wt% SiO 2 can be used as a raw building material. Through chemical kinetics and mineralogical transformation analyses, Fe 2 SiO 4 in copper slag decomposes to release Fe 2+ , which can reduce and leach Mn from pyrolusite. The unreacted shrinkage nuclear reaction model under the control of the surface chemical reaction is the most suitable model to describe the process, and when the apparent activation energy is 35.50 kJ/mol, the apparent rate equation is:
$$1-{\left(1-\times \right)}^{1/3}=979.65{\left[\mathrm{CS}/\mathrm{Pyrolusite}\right]}^{2.6072}{\left[{\mathrm{H}}_{4}{\mathrm{SO}}_{4}\right]}^{1.3143}{\left[\mathrm{L}/\mathrm{S}\right]}^{0.5649}e\mathrm{xp}\left(-35.50/\mathrm{RT}\right)$$ Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Jiaxing Zhang,Ajuan Zhou,Limin Ren,Min Yang,Guangjin Hou,Anfeng Zhang,Chunshan Song,Xinwen Guo
A clear understanding of the acidity-activity relationship is an important prerequisite for designing functional materials in alkylation of benzene with methanol. Herein, a series of b -axis-oriented [Fe/Al]-MFI nanosheets with similar thickness but varied acidities were prepared by tuning Fe incorporation to systematically study the effect of acidity on their alkylation performance. Comprehensive physiochemical studies demonstrate that tetrahedral framework type Fe species are dominated. The incorporation of Fe significantly weakens the strong acid strength of zeolite thus endowing the samples with proper acidity, consequently showing a strong inhibition effect on the by-product ethylbenzene. Moreover, a long-term stable operation (>300 h) is further achieved over the [Fe]-S-1 nanosheets by optimizing the content of framework Fe. This work elucidates the important relationship between acidity and alkylation activity.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Yuxin Liu,Qintie Lin,Junli Zheng,Xindan Fan,Kehuan Xu,Yongjie Ma,Jin He
In this work, the magnetic nanocomposite Fe@SiC was prepared by a hydrothermal method and determined by SEM, XRD, XPS, FTIR and VNA. Fe 3 O 4 particles were loaded onto SiC with great success, and the synthesized composites had favorable microwave absorption properties. Fe@SiC was used to activate persulfate in a microwave field for the degradation of BDE209 in soil. Specifically, the synergistic interaction between microwaves and Fe@SiC showed excellent catalytic performance in activating PS to degrade BDE209 (90.1% BDE209 degradation in 15 min). The presence of •OH, O 2 • − and 1 O 2 was demonstrated based on quench trapping and EPR experiments. LC ‒ MS was applied to determine the intermediates and propose the possible degradation pathway for BDE209 in the MW/Fe@SiC/PS system, and it was found that BDE209 produced almost no lower brominated diphenyl ethers. Therefore, the toxicity of BDE209 was found to be reduced using toxicity assessment software. Overall, this work provides an effective approach for the degradation of BDE209 in environmental remediation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 23
·5557-5564
·
IF 5.6
Yi Sheng,Hongmei Zheng,Jingting Hou,Wanying Zhang,Hong Chen,Luanjie Nie,Jing Zheng,Qingxue Lai
Fe–N–C materials as popular non-Pt group metal (non-PGM) electrocatalysts demonstrated huge potential for replacing Pt-based materials for efficient oxygen reduction reaction (ORR) electrocatalysis in acidic media. Herein, a metal–organic-framework (MOF)-based dual ligand strategy is proposed to develop advanced Fe–N–C materials with a controllable density of Fe-Nx sites and electrochemically active surface area, attributed to the synergistic effect from secondary ligand manipulation and Zn evaporation during pyrolysis. As a result, the optimized catalyst exhibits an ORR half-wave potential of 0.747 V vs. RHE and long-term stability with only a 29 mV negative shift after 3000 potential cycles in 0.5 M H2SO4 electrolyte. More far-reaching, this MOF-based dual ligand strategy opens a novel avenue to the precise fabrication of efficient catalysts.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 48
·26573-26579
·
IF 11.9
Zhiwen Li,Yan Xie,Jianxin Gao,Xiaoke Zhang,Jia Zhang,Yu Liu,Gao Li
The in-depth understanding of the functions and interactions of multiple transition metal-based species in non-noble metal electrocatalysts is still obscure and challenges the oxygen reduction reaction (ORR). Herein, we rationally developed a Hm/Cy@C-900 electrocatalyst comprising multiple iron active sites of FeSx and Fe3C clusters and FeNx sites, which was characterized using XRD, S/TEM, and Mössbauer analyses. Hm/Cy@C-900 exhibited a high ORR performance (E1/2 0.845 V vs. RHE) in an O2-saturated KOH electrolyte, which outperformed the Hm/TCA@C-900 counterpart and commercial Pt–C electrocatalysts. Furthermore, the equipped zinc–air battery (ZAB) of Hm/Cy@C-900 could reach a power density of 192 mW cm−2@260.7 mA cm−2, which is much more efficient than that of Hm/TCA@C-900 (131 mW cm−2@201.2 mA cm−2) and a 20 wt% Pt–C catalyst (109 mW cm−2@221.3 mA cm−2). The superior ORR performance of Hm/Cy@C-900 was attributed to the promotional effect of FeSx and Fe3C clusters with FeNx active sites. Our work provides a rational design for and in-depth synthesis of FeNSC electrocatalysts for promoting the ZAB activity.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Feijian Xiao,Dezhi Yang,Chun Xun,Haiyan Li,Qiulan Li,Zitao Zhong,Daqiao Wei,Yaling Yang
Nanozymes have drawn increasing attention due to unique enzyme-mimic catalytic activities for the treatment of bacterial infections. Herein, a novel tri-metal nanozyme for synergistic eradication of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) was generated by Mo/Fe doped carbon dots (Mo/Fe-CDs) wrapping copper peroxide (CuO 2 ) nanozyme (Mo/Fe@CuO 2 ). Mo/Fe@CuO 2 showed near-infrared (NIR) light-enhanced peroxidase-like catalytic activity, and H 2 O 2 self-supply to promote the generation of reactive oxygen species (ROS) for highly efficient antibacterial photothermal therapy. The CuO 2 could generate H 2 O 2 in the acidic microenvironment, and Mo/Fe-CDs consequently could convert H 2 O 2 to hydroxyl radicals (·OH), resulting in the improvement of sterilization efficiency. Interestingly, Mo/Fe-CDs could activate the transformation of Cu 2+ to Cu + through the co-catalytic reaction based on the Mo 4+ /Mo 6+ and Fe 3+ /Fe 2+ redox couples, and provided photonic hyperthermia (PTT) to enhance the peroxidase-like activity. Meanwhile, Mo/Fe@CuO 2 showed glutathione (GSH) oxidase-like activity, which can achieve the depletion of glutathione (GSH) in bacteria, thus significantly improving the bactericidal effect. The collaborative eradication of bacteria, through innovative metal carbon-based nanozyme technology, provides a powerful and feasible approach to treating bacterial infections that threaten human health.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Huiming Xiang,Weiye Liu,Lianghu Su,Sujuan Chen,Yu Han,Chunyuan Zhu,Saier Wang,Chaoqun Tan,Longjiang Zhang
The synthesis of ammonia through nitrate reduction has received increasing attention due to its ability to simultaneously achieve wastewater treatment and energy production. This study investigated the mechanism of high concentration nitrate reduction processes using Fe/Fe 2+ process. Batch tests were carried out in high level nitrate reduction in Fe/Fe 2+ system with different particle size iron powder to investigate the evolution of nitrate, nitrite, ammonium, nitrogen balance, and pH in the liquid phase. The characterization results showed that the solid products were γ-FeOOH when ZVI and nitrate react with lower activity. With the increasing of reduction reactivity, green rusts (GRs) generated and divided the reduction process into two phases. ZVI transformed into GRs and finally produced Fe 3 O 4 . The generation pathways of GRs in this study were mainly consist of the partial oxidation of Fe 2+ and the hydrolysis of Fe 2+ combing with the oxidation of Fe(OH) 2 . The reactivity between ZVI and nitrate plays a pivotal role in the formation of GRs. This study has provided a more comprehensive exploration of the formation mechanism of green rust during nitrate reduction.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 48
·18342-18353
·
IF 4
Minghao Dou,Mengjie Yao,Kai Ding,Yuye Cheng,Hongyu Shao,Shenjie Li,Yanyan Chen
Heterostructures formed by combining semiconductor materials with different band structures can provide work functions, d-band positions and electronic properties different from bulk materials and are considered as an effective strategy to improve the catalytic activity through electronic modification. In this study, an efficient MoS2/Fe-Ni3S2/NF heterojunction material was prepared by a two-step hydrothermal method. With the help of flake Ni(OH)2 synthesized in the first step, growth sites were provided for flake Ni3S2. The electronic structure of Ni3S2 was optimized by Fe doping, while the construction of the MoS2/Fe-Ni3S2 heterostructure allowed the catalyst to expose more active sites. MoS2/Fe-Ni3S2/NF exhibited a small charge transfer resistance and excellent electrocatalytic performance. At a current density of 10 mA cm−2, only low overpotentials of 148 mV and 118 mV were required for the oxygen precipitation reaction (OER) and hydrogen precipitation reaction (HER), respectively. Notably, when MoS2/Fe-Ni3S2/NF is used as the anode and cathode for overall hydrolysis, only 1.51 V is required to reach a current density of 10 mA cm−2, demonstrating its great potential for application in hydrolysis. This work provides a feasible idea for the rational construction of non-precious metal bifunctional electrocatalysts with excellent performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Chen Da,Xia Zhaoming,Guo Zhixiong,Gou Wangyan,Zhao Junlong,Zhou Xuemei,Tan Xiaohe,Li Wenbin,Zhao Shoujie,Tian Zhimin,Qu Yongquan
Inspired by structures of natural metalloenzymes, a biomimetic synthetic strategy is developed for scalable synthesis of porous Fe-N 3 single atom nanozymes (pFeSAN) using hemoglobin as Fe-source and template. pFeSAN delivers 3.3- and 8791-fold higher oxidase-like activity than Fe-N 4 and Fe 3 O 4 nanozymes. The high catalytic performance is attributed to (1) the suppressed aggregation of atomically dispersed Fe; (2) facilitated mass transfer and maximized exposure of active sites for the created mesopores by thermal removal of hemoglobin (2 ~ 3 nm); and (3) unique electronic configuration of Fe-N 3 for the oxygen-to-water oxidation pathway (analogy with natural cytochrome c oxidase). The pFeSAN is successfully demonstrated for the rapid colorimetric detection of glutathione with a low limit of detection (2.4 nM) and wide range (50 nM–1 mM), and further developed as a real-time, facile, rapid (~6 min) and precise visualization analysis methodology of tumors via glutathione level, showing its potentials for diagnostic and clinic applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2023
·Vol. 15
·期 21
·3838
·
IF 3.4
Siru Zhou,Chuanhan Chen,Ruohong Li
Sludge conditioning is a crucial step in sludge dewatering aimed at minimizing excessive sludge production. The Fenton process, which harnesses oxidative radicals to dismantle extracellular polymeric substances (EPS) and microorganisms, has been unequivocally proven to enhance sludge dewaterability. However, the widespread adoption of the Fenton process is hampered by its high costs and logistical challenges in transportation. In contrast, the Fe(II)-activated sodium percarbonate (Fe(II)/SPC) process has emerged as a promising technology for sludge conditioning due to its remarkable performance and safe operation. However, limited information is available regarding the optimization of Fe(II)/SPC for sludge conditioning and dewatering at full scale. This study conducted the sludge conditioning and dewatering process within a full-scale wastewater treatment plant, utilizing the response surface methodology (RSM) to optimize the Fe(II)/SPC process. Furthermore, this study investigated its impact on sludge structure and compared the economic benefits of the Fe(II)/SPC process with other full-scale conditioning processes. The results of bound water and LDH analysis revealed that the Fe(II)/SPC process not only degraded EPS but also disrupted microbial cells, thereby releasing intracellular water. Based on the RSM results, we successfully established a polynomial prediction model to determine the optimal capillary suction time (CST) and moisture content. The optimal parameters determined through RSM were an initial pH of 3.02, Fe(II) dosage of 0.05 g/g TSS, and SPC dosage of 0.07 g/g TSS. The validation test confirmed the accuracy of the prediction results, with the conditioned sludge exhibiting a CST of 31.6 s and a moisture content of 51.47%. Furthermore, when compared to the PFS and Fenton processes, the Fe(II)/SPC process demonstrated higher economic efficiency and safety, while maintaining good dewatering performance. Overall, the Fe(II)/SPC treatment shows promise as a prospective sludge dewatering and conditioning process.Keywords:sludge conditioning;sodium percarbonate;advanced oxidation process;sludge dewaterability
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Cheng Peng,Xinyu Chen,Yu Yang,Feiyang Luo,Xuehui He,Yan Yu,Qiao Deng,Tianding Hu,Shaoyun Shan,Yunfei Zhi,Lihong Jiang,Hongying Su
The development of advanced strategy to activate persulfate for wastewater treatment is an ever-hot research topic. Herein, a high-performance composite catalyst MIL-68(Fe)/CuBi 2 O 4 (30 %) (M-CBO-30) was prepared by in-situ synthesizing MIL-68(Fe) in the CuBi 2 O 4 . The catalytic performances of M-CBO-30 as heterogeneous catalyst to activate PDS for the Rhodamine B (RhB) degradation were systematically studied. It was shown that the M-CBO-30/PDS system presented an ultrahigh RhB degradation efficiency which could remove 100 % RhB within 5 min only using 0.4 g L − 1 catalyst and 0.4 mM PDS. In addition, the M-CBO-30 could remove RhB at a wide pH range (2–10). One should note that the M-CBO-30 exhibited outstanding reusability which afforded high degradation efficiency after 5 successive recycles. And the catalyst structure remained still after being used for 5 catalytic cycles. Heavy metal ions leaching experiment indicated that Cu 2+ leaching concentration of M-CBO-30 was far lower than that of the city water criterion in Europe. The RhB degradation mechanism by M-CBO-30/PDS system was proposed based on the result of electrochemical experiment, radical quenching test, electron paramagnetic resonance and XPS analysis. The RhB degradation was attributed to the oxidization of reactive oxygen species (i.e., SO 4 •− , •OH and 1 O 2 ). The synergistic effect of redox cycle of surface Fe, Bi and Cu were responsible for the high-efficient PDS activation. The excellent recyclability, outstanding structural stability, wide pH application range, less heavy metal leaching and superhigh RhB degradation efficiency highlights the light application prospect of M-CBO-30 in SR-AOPs-driven RhB decontamination.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·
IF 3.6
Kai Wang,Hengtai Zhang,Jinrong Liang,Zhigang Xu,Shangyu Huang,Jian Peng,Chao Yang,Wenjun Li,Qiang Shen,Chuanbin Wang
Al content is of great importance for the evolution of the microstructure and compressive performance of the high-Mn and high-Al porous steels. Herein, Fe–Mn–Al porous steels with different Al contents are prepared via powder sintering at different temperatures. The results show that the main phases of the sintered samples at 640 °C are α-Fe, α-Mn, and Al, while a small amount of Fe 2 Al 5 and Al 8 Mn 5 exists in the samples with 15 and 20 wt% Al. At 1200 °C, the sintered sample with 5 wt% Al is composed of γ-Fe, while those with 15 and 20 wt% Al are mainly α-Fe. The length of Mn depletion region and porosity of the samples increase with the increase of Al content. The largest total and open porosity are observed in the 1200 °C-sintered sample with 20 wt% Al, which are 63.1 and 60.7 vol%, respectively. The compressive strength decreases sharply from 770 MPa for the sample with 5 wt% Al to 7.5 MPa with 15 wt% Al, after sintering at 1200 °C. Ductile fracture occurs in the sample with 5 wt% Al, while brittle fracture is the main fracture mode in those with 15 and 20 wt% Al.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）