SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Fangke Yu,Yi Wang,Hongrui Ma,Minghua Zhou
In this study, we demonstrated that hydrothermal synthesized FeS 2 was highly efficient to catalyze the H 2 O 2 decomposition for diclofenac sodium (DCF) degradation in a wide range of initial pH (3–9) by heterogeneous electro-Fenton (EF) process, and this “Pyrite-EF” showed a better performance for the mineralization of DCF in comparison with the classic EF process. Effect of pyrite content on the hydroxyl radicals generation and iron dissolution produced by the decomposition of hydrogen peroxide (H 2 O 2 ), and applied current density on the degradation kinetics and mineralization efficiency were studied. Moreover, toxicity assessment by means of microtox method showed the solution toxicity was removed after treatment. Experimental results revealed that the enhancement of DCF degradation rate in the Pyrite-EF process was attributed to the molecular oxygen activation induced by more surface bound ferrous ions on FeS 2 , generating superoxide anions to accelerate the Fe(II)/Fe(III) cycle on the FeS 2 surface, which favored the H 2 O 2 decomposition to generate more hydroxyl radicals for the DCF degradation via a heterogeneous EF-like process. These findings could provide some new insights into the molecular oxygen activation induced by FeS 2 and the subsequent heterogeneous Pyrite-EF degradation of organic pollutants from wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sheng Pang,Liangwei Cong,Youpeng Xu,Yiwei Sun,Dong Wang,Guoyu Qian,Zhi Wang
Typically, the X-ray diffraction spectrum of a highly oriented structure (HOS) MAX phase displays a prominent (002) characteristic peak. Surprisingly, this principle does not hold true for Ti 2 SC. Instead, the synthesized Ti 2 SC consistently exhibits a polyhedral structure (PS). Furthermore, even with hot-pressing sintering, the purity of Ti 2 SC remains relatively low. The primary factors contributing to anomalous crystal structures and low purity are insufficient crystal growth and limited reactant contact. In this study, we successfully achieved dual regulation of the crystal structure and purity of Ti 2 SC within the Ti/TiC/FeS 2 system, which was accomplished by enhancing reactant contact and controlling the growth rates of crystal planes. Notably, the intermediate products FeS and Fe, existing in a liquid phase at varying temperatures, played a crucial role in both the formation of Ti 2 SC and the growth of Ti 2 SC crystals. As a result, PS-Ti 2 SC and HOS–Ti 2 SC with purity greater than 99 wt% were successfully prepared. The formation of PS-Ti 2 SC can be attributed to the inadequate growth of each crystal plane at relatively lower temperatures (1500 °C). While the synthesis of HOS–Ti 2 SC necessitates the utilization of both a liquid phase and high temperature, as the epitaxial growth mechanism followed by vertical growth has been demonstrated to facilitate the generation of highly oriented crystals. The liquid phase facilitates the swift growth of Ti 2 SC crystals along the (001) crystal plane, while the (002) crystal plane necessitates a higher temperature (1760 °C) for relatively rapid growth. This work will open a new pathway for the development of the MAX phase from the perspective of crystal structure regulation and high purification preparation.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Tong Zhou,Guohui Dong,Jiahao Geng,Kai Han,Chenyang Xiao
In this study, a novel Z-scheme + II-type ternary heterojunction nanocomposite was prepared by one-step solvothermal method using g-C 3 N 4 , FeS 2 and Fe 2 O 3 as raw materials. The successful preparation of this ternary heterojunction was confirmed by the structural analysis and the surface morphology study. Compared with g-C 3 N 4 , the ternary photocatalyst showed excellent photocatalytic performance for the degradation of tetracycline (TC). The enhancement of photocatalytic activity is mainly due to the increase of light absorption capacity, effective separation of carrier in space, and increase of electron transfer channels in this Z-Scheme + II-type composite system. The scavenger test and electron spin resonance spectroscopy show that O 2 − is the main oxidizing free radical in the photocatalytic system. Based on liquid chromatograph-mass spectrometer, a possible degradation pathway of TC was proposed. This study opens up a new idea for the design and synthesis of efficient Z-Scheme + II-type photocatalysts for environmental purification.
研究领域:
环境科学
·
材料科学
·
化学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 4
·1935-1944
·
IF 3.925
Hancheng Tan,Xiaolan Zhou,Haiyan Zhu,Wenxiu Gu
A micro/nano hierarchical flower-like ZnS/FeS2 direct Z-scheme heterojunction visible-light catalyst was in situ derived from a Prussian blue analogue cube (Zn–Fe PBA) using a facile one-pot hydrothermal sulfidation strategy. The as-prepared ZnS/FeS2 catalyst shows extraordinarily boosted visible-light photocatalytic degradability for Rhodamine B (RhB) with the synergism of peroxydisulfate (PDS). Under visible-light illumination, 98.5% degradation efficiency can be achieved within 15 min and 100% within 20 min with excellent structural stability of ZnS/FeS2. The degradation kinetic constant of ZnS/FeS2 + PDS is 9.33 times that of ZnS/FeS2, 23.02 times that of p-ZnS/FeS2, 24.05 times that of FeS2, and 28.25 times that of ZnS, respectively. The ZnS/FeS2 heterojunction shows significant synergistic benefits in the photocatalytic degradation reaction. More advantageously, ZnS/FeS2 + PDS shows excellent photocatalytic degradation performance in a wide pH range (1–10). A reasonable direct Z-scheme heterojunction mechanism for visible-light responsive photocatalytic degradation of RhB with ˙OH, h+, ˙O2−, and ˙SO4− as the crucial active species is recommended for the ZnS/FeS2 + PDS composite system. The micro/nano hierarchical flower-like structure of ZnS/FeS2 simultaneously combines the high activity of nano-materials with the advantages of easy recycling of micro-sized materials. The in situ transformation characteristics of ZnS/FeS2 from the PBA template contribute to the advantageous high performance and structural stability.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2022
·
IF 12.545
Xiangqin Meng,Sijia Zou,Dandan Li,Jiuyang He,Ling Fang,Haojue Wang,Xiyun Yan,Demin Duan,Lizeng Gao
The coronavirus disease 2019 (COVID-19) pandemic has created a huge demand for sensitive and rapid detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The current gold standard for SARS-CoV-2 detection is reverse transcription-polymerase chain reaction (RT-PCR)-based nucleic acid amplification. However, RT-PCR is time consuming and requires specialists and large instruments that are unattainable for point-of-care testing (POCT). To develop POCT for SARS-CoV-2, we combined recombinase polymerase amplification (RPA) and FeS 2 nanozyme strips to achieve facile nucleic acid amplification and subsequent colorimetric signal enhancement based on the high peroxidase-like activity of the FeS 2 nanozymes. This method showed a nucleic acid limit of detection (LOD) for SARS-CoV-2 of 200 copies/mL, close to that of RT-PCR. The unique catalytic properties of the FeS 2 nanozymes enabled the nanozyme-strip to amplify colorimetric signals via the nontoxic 3,3′,5,5′-tetramethylbenzidine (TMB) substrate. Importantly, the detection of clinical samples of human papilloma virus type 16 (HPV-16) showed 100% agreement with previous RT-PCR results, highlighting the versatility and reliability of this method. Our findings suggest that nanozyme-based nucleic acid detection has great potential in the development of POCT diagnosis for COVID-19 and other viral infections.
研究领域:
分子生物学
·
病毒学
·
即时诊断
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）