SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qirui Wang,Pengfei Xiao
Transition metal compounds are often used as activators in advanced oxidation processes for the treatment of refractory organics. However, the problems of inter-particle agglomeration, metal ion leaching and difficulty in recycling frequently occurred, resulting in reduced activation performance and secondary pollution. In this study, biochar (BC) was prepared from agricultural waste pine cone shells, and then a self-synthesized heterogeneous CuFe 2 O 4 -MoS 2 @BC composite was prepared for the first time, which can be used as an activator of peroxymonosulfate (PMS) for the oxidative degradation of tetracycline (TC). Analysis techniques such as XRD, SEM, BET, FT-IR, Raman, XPS, and VSM indicated that the heterogeneous catalyst with good surface properties and catalytic stability has been successfully prepared. When different concentrations of TC were treated with 0.5 g/L CuFe 2 O 4 -MoS 2 @BC and 1 mmol/L PMS, the highest degradation rate could reach 99.66 % after 60 min. Under the interference of pH, common anions and humic acid in the water environment, the degradation system can still achieve high degradation efficiency, showing excellent anti-interference ability and practical applicability. The analysis of activation mechanism reveals that the three redox ion pairs Cu + /Cu 2+ , Fe 2+ /Fe 3+ and Mo 4+ /Mo 6+ simultaneously participated in the activation of PMS, realizing multi-path electron transfer . And MoS 2 played an excellent co-catalysis role in promoting the cycling of the valence states of the ions. A total of 24 intermediate products was detected in the degradation process using LC-MS technology, and the possible degradation pathways for TC degradation were proposed. The self-synthesized CuFe 2 O 4 -MoS 2 @BC composite with high catalytic performance, stability, recyclability and low ion leaching rate has broad application prospects in the treatment of tetracycline antibiotic wastewater by activated PMS.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 2.1
Haoyuan Zheng,Qianyuan Mo,LiJing Song,Xi Zhang,Jie Huang,Guishang Sheng
Co-MoS 2 @BC catalysts were prepared using pine cones as biochar source, and the surface morphology and microstructure of the catalysts were analyzed and the successful preparation of the materials was verified by adopting the characterization means such as BET, SEM, XRD, FTIR, TEM, XPS, Raman. At the concentration of tetracycline (TC) in water of 20 mg/L, the reaction system with catalyst participation resulted in 98.88 % pollutant removal and efficient degradation, and the effects of TC concentration, coexisting chemicals, initial pH, catalyst dosage, PMS dosage, and other factors on the catalytic performance of Co-MoS 2 @BC were investigated. The results of quenching experiments and electron paramagnetic resonance (EPR) examinations were combined, the reactive substances whose main roles in the reaction process were identified as single linear oxygen ( 1 O 2 ), and the simultaneous presence of electron transfer-mediated non-radical pathways in the Co-MoS 2 @BC/PMS/TC system was confirmed using Linear sweep voltammetry (LSV). The reaction process's intermediates were examined using liquid chromatography-mass spectrometry (LC-MS), which also offered potential degradation routes.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Wantao Li,Yunlan Xu,Dengjie Zhong,Danli Tang,Tanxia Xiang,Chunmiao Fan,Yuanfang Yang
In this study, CoFe2O4 anchored by MoS2 modified biochar (CoFe2O4@MoS2–BC) was synthesized using a hydrothermal approach and utilized to activate peroxymonosulfate (PMS) to degrade rhodamine B (RhB). The effects of pH value, catalyst and PMS dosage, RhB concentration, and coexisting compounds were systematically investigated. Within 7 min, CoFe2O4@MoS2–BC achieved a removal rate of 99.63% for 100 mg·L–1 RhB. The outstanding stability and environmental compatibility of CoFe2O4@MoS2–BC was verified by cycling and metal ion leaching experiments. The contribution of 1O2, SO4•–, •OH, and •O2– in the degradation procedure was revealed by quenching experiments, among which 1O2 was the predominant active species. Electrochemical characterization indicated that CoFe2O4@MoS2–BC exhibited enhanced current density, redox activity, and superior electron transfer capability. Comprehensive characterization analysis and experimental data revealed that the high efficiency of CoFe2O4@MoS2–BC was attributed to Co2+/Co3+, Fe2+/Fe3+, and Mo4+/Mo6+ redox cycling on the CoFe2O4@MoS2–BC surface. The cycles of Co2+/Co3+ and Fe2+/Fe3+ were enhanced by Mo, while unsaturated S increased the reactivity of Mo, thereby accelerating the redox of metal ions; oxygen vacancies (Ov) enhance the mobility of surrounding oxygen ions mobility and promoted the conversion from lattice oxygen (Olat) to reactive oxygen species (O*), thereby activating PMS effectively. This research is expected to provide innovative insights that will inform the design and development of excellent activity and stability of heterogeneous metal-based catalysts.
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 RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 6
·1743-1754
·
IF 1.6
Zhu Kaihao,Xian Han,Peng Lin,Wang Shuiyun,Chen Chunning,Liu Jinxiang
A molybdenum disulfide/biochar (MoS 2 /BC) composite was synthesised by a facile hydrothermal process and used for the adsorption of U(VI) from aqueous solution through batch experiments. Results showed that MoS 2 /BC exhibit a saturated adsorption capacity of 451.3 mg/g at pH = 5, t = 60 min, T = 298 K, M/V = 0.02 g/L, C U(VI) = 10 mg/L, which was higher than that of MoS 2 and biochar. The process of MoS 2 /BC for U(VI) adsorption was better simulated via the pseudo-second-order kinetic model ( R 2 = 0.999) and Langmuir isotherm model ( R 2 = 0.999). The adsorption mechanism of U(VI) includes chemical adsorption, electrostatic attraction, surface complexation of oxygen-containing functional groups, cation- π bond and coordination of S group. After five adsorption–desorption experiments, the elimination rate remained above 80%.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Liangmei Rao,Yifu Zhu,Zhongshu Duan,Ting Xue,Xuemin Duan,Yangping Wen,Annamalai Senthil Kumar,Weiming Zhang,Jingkun Xu,Akbar Hojjati-Najafabadi
Biomass waste, a good candidate for advanced carbon materials for sustainable electrodes, is receiving more and more attention for high value-added materials because of its promising contribution to economic growth and sustainable development. We proposed a green co-hydrothermal approach to prepare lotus seedpods biochar (BC) decorated molybdenum disulfide (MoS 2 ) from waste lotus seedpods and precursors of MoS 2, and a portable, flexible, outdoor and inexpensive sensing platform for hyperin on the integrated flexible three-electrode using U-disk potentiostat with smartphone was successfully developed. Structure and properties of MoS 2 -BC were characterized, it was proved that BC improves microstructure and morphology, electronic conductivity, electrode stability and electrocatalytic properties of MoS 2 . Attributing to these impressive features, the detection signal of hyperin was significantly amplified by the MoS 2 -BC modified glass carbon electrode (GCE) in detection range of 0.01–21 μΜ with detection limit (LOD) of 5 nM. It was worth mentioning that the MoS 2 -BC modified screen-printed electrode (SPE) performs hyperin detection in range of 100 nM - 3 μM with LOD 50 nM (S/N = 3). The practicability of the proposed method confirmed that the portable, on-site, low-cost, and outdoor detection of hyperin was feasible and practical in comparison with traditional both electrochemical sensing and HPLC methods.
研究领域:
材料科学
·
环境科学
·
电化学
·
可持续发展
✓ 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）