CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shizong Wang,Jianlong Wang
Cobalt sulfides as persulfate activator have received increasing interest in the field of persulfate-based advanced oxidation process. In this study, Co 9 S 8 anchored in N, S, O heteroatoms co-doped carbon (CoSx@N-S-O-C) composite was prepared with different sulfur precursors (sulfur, thiourea, thiophene and benzyl disulfide), and used to activate peroxymonosulfate (PMS) for sulfamethoxazole (SMX) degradation. The effect of temperature, pH, inorganic ions, humic acids and water components on SMX degradation was investigated. The results showed that sulfur precursor could regulate the catalytic activity of the composite through changing the cobalt speciation and carbon structure. The catalytic activity was highest when the molar ratio of sulfur to cobalt was 5:1 (CoS x @N-S-O-C-5). Sulfate radicals (dominant) and hydroxyl radicals contributed to SMX degradation. The intermediate products during SMX degradation were identified, and the possible pathway of SMX degradation was proposed. Pyridinic N, Co-N, cobalt, S 2− , S 2 2− , C-S-C and C-SO x were active sites for PMS activation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ying Wu,Chi Song,Xinyan Yu,Xianbao Shen,Lijie Xu,Ying Zhang,Han Gong,Changlei Xia,Lu Gan
In this study, waste polyethylene (PP) obtained from obsoleting water purifier filter was mixed with ferric chloride hexahydrate (FeCl 3 ·6H 2 O) to prepare a series of single crystal phased iron compound incorporated carbon composites (Fe/PP-C). The prepared Fe/PP-Cx catalysts were then utilized to degrade sulfamethoxazole (SMX) in water by activating peroxymonosulfate (PMS). The results showed that with the assistance of pyrolysis temperature regulation, waste PP filter could control the crystalline phase of the iron compound in the prepared Fe/PP-Cx through releasing distinct gaseous atmospheres at respective pyrolysis temperature. When the pyrolysis temperature was set at 600 °C and 900 °C, pure phase ferric oxide (Fe 3 O 4 ) and zero-valent iron (ZVI) incorporated carbon catalysts were obtained, respectively. 0.2 g/L of Fe/PP-Cx could completely degrade 0.02 mM of SMX within 20 min, in which the toxicity of the reaction solution was also effectively reduced. In both Fe/PP-Cx/PMS systems, non-radical mechanisms dominated the SMX degradation, in which singlet oxygen played the dominant role in the Fe/PP-C600/PMS system, whereas electron transfer process was primarily responsible for SMX degradation in the Fe/PP-C900/PMS system. High-valent iron-oxo species was also involved in SMX degradation in the Fe/PP-C900/PMS system. Since Fe/PP-C600 and Fe/PP-C900 respectively activated PMS via heterogeneous and homogeneous routes, Fe/PP-C600 maintained higher longtime use stability. This study aims to present a simple approach to manipulate the nonradical organic pollutant degradation mechanisms in PMS activated system, which also provides a new strategy of utilizing waste polymer.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuang Liu,Chao Liu,Hejiao Zhang,Weizhen Zhang,Wei Ding,Huaili Zheng,Hong Li
The sulfite (S(IV))-based advanced oxidation process (AOP) has emerged as an appealing alternative to the traditional persulfate-based AOP for the elimination of organic contaminants from diverse water matrices. In this work, a silica reinforced ZIF-67(Co) catalyst (CZS) is fabricated, characterized and tested in the activation of S(IV) for the sulfamethoxazole (SMX) degradation. The prepared CZS demonstrates superior stability and catalytic ability for the degradation of SMX compared to ZIF-67(Co) across a broad pH range. Unlike the conventional radical-dominated oxidation systems, the CZS/S(IV) system for SMX degradation operates through a non-radical mechanism, featuring high-valent Co(IV) and singlet oxygen ( 1 O 2 ) as the predominated reactive species. The hydroxylated Co species exposed on the CZS surface is identified as the pivotal active site, realizing the S(IV) activation through a complexation-electron transfer process, resulting in the production of various reactive intermediates. Co(II) undergoes the conversion to Co(IV) by generated HSO 5 − , and 1 O 2 predominantly originates from the intermediate SO 4 •− . Profiting from the highly selective oxidation capacities of Co(IV) and 1 O 2 , the established oxidative system demonstrates a remarkable interference resistance and exhibits an exceptional decontamination performance under real-world water conditions. In short, this work provides a sustainable S(IV)-based oxidation strategy for environmental remediation via non-radical mechanism.
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PubMed
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Yili Ding,Yanzhi Ma,Charles Ding,Jiehua Nie,Zhe Xu
Through cyclodextrin selection from phase solubility study, complexation method screening, and complexation condition optimization by using single and orthogonal strategy, the complexes of trimethoprim with methyl β -cyclodextrin, HP β -cyclodextrin and HP- γ -cyclodextrin with the best solubility increasing so far were prepared and confirmed by FTIR, DSC and proton NMR spectra. The in vitro pharmacokinetic study showed that trimethoprim was 80 %–90 % released in three complexes in 20 min., and in their dog's in vivo pharmacokinetic study, the C max was increased from 0.22 µg/mL to 0.85 µg/mL, 0.7 µg/mL and 0.72 µg/mL, the AUC 0∼40 was increased from 2.35 µg*h/mL to 3.94 µg*h/mL, 5.06 µg*h/mL and 6.73 µg*h/mL, the LC was shorten from 2.17 L/kg/h to 0.89 L/kg/h, 0.56 L/kg/h and 1.07 L/kg/h for the complexes with methyl β -cyclodextrin, HP β -cyclodextrin and HP- γ -cyclodextrin respectively. After combination with sulfamethoxazole cyclodextrin complex, the antibacterial activity of the complex of trimethoprim with methyl β -cyclodextrin was increased significantly compared with the pure drug alone, indicated that this complex can be used as new potent antibacterial agent.
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RSC Advances
·
2026
·Vol. 16
·期 41
·49220-49233
·
IF 6.1
Hu Y,Lv R,Fu J,Yan J,Cheng S,Xue M,Zhang W.
In this paper, a series of monoclinic crystal structure bismuth vanadate (m-BiVO 4 ) photocatalysts with different transition metal oxide loading amounts (MO x @BiVO 4 , M represents Mn, Fe, Co, Ni and Cu) were constructed to boost photocatalytic sulfamethoxazole (SMX) degradation with peroxymonosulfate (PMS) assistance. MO x @BiVO 4 samples exhibited enhanced light absorption properties, specific interfacial charge transfer ability and reactive oxygen species (ROS) production in comparison with pristine BiVO 4 . The degradation efficiencies of MnO x @BiVO 4 , FeO x @BiVO 4 , CoO x @BiVO 4 , NiO x @BiVO 4 and CuO x @BiVO 4 for SMX were 92.74%, 96.34%, 97.80%, 93.31% and 99.89% with PMS activation in 90 min visible light illumination, respectively. The crystalline structure, elementary composition, photocatalytic activity and degradation mechanism of MO x @BiVO 4 samples were investigated systematically with the techniques of XRD, Raman spectroscopy, TEM, XPS, UV-vis DRS, PC, EIS, PL and EPR. The results showed that all MO x were successfully loaded on BiVO 4 . The redox cycling of M acted as a charge transfer intermediate to accelerate interfacial charge separation, while also serving as adsorption and activation sites for PMS, thereby promoting efficient mass transfer in the heterogeneous system. EPR and quenching experiments demonstrated that 1 O 2 , SO 4 ˙ - , ˙OH and ˙O 2 - species were all generated in the MO x @BiVO 4 system; in particular, ˙OH and 1 O 2 played dominant roles in the degradation of SMX. This study provides inspiration for the design of high-performance MO x -supported photocatalytic activators and broadens their potential applications in environmental remediation.
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PubMed
高影响因子
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