Porous Mn₂O₃/pSiO₂ Nanocomposites on Bio-scaffolds for Tetracycline Degradation

Abstract

In this study, manganese sesquioxide (Mn 2 O 3 ) nanoparticles (NPs) were inserted into porous silica (pSiO 2 ) and thus a mosaic-like porous composite of Mn 2 O 3 / pSiO 2 was constructed by a bio-templating route. Structure and morphology analyses reveal the successful assembly and high dispersion of Mn 2 O 3 NPs on the matrix of porous SiO 2 . Because of the presence of a porous structure and high number of accessible active sites, the resulting Mn 2 O 3 /pSiO 2 exhibits both large adsorption capacity and remarkable catalytic activity for the removal of tetracycline (TC, 80 mg•L −1 ) from aqueous solutions. With the assistance of H 2 O 2 , Mn 2 O 3 /pSiO 2 could synergistically degrade TC with a total removal efficiency (RE) of 80%, which is much greater than those of pSiO 2 (13%) and nMn 2 O 3 (63%). Meanwhile, Mn 2 O 3 /pSiO 2 possesses a wide pH application range (3.0−11.0, RE > 83%), quite good efficiency (64%) for highly concentrated TC (240 mg•L −1 ), and excellent reusability (RE = 70% after four cycles). Radical-trapping tests and electrochemical measurements reveal that a direct electron transfer pathway plays the dominant role in this TC−Mn 2 O 3 /pSiO 2 − H 2 O 2 catalytic system. This study provides a convenient and effective strategy to design porous composite adsorbents/catalysts for the remediation of antibiotic wastewater.

CuS@Cu-CD composites as efficient heterogeneous Fenton-like catalysts for the photodegradation of tetracycline

“…Table 1 lists a comparison of removal efficiencies of tetracycline in the present work with some reported Fenton-like catalysts. 43,49–51 As displayed, our designed catalyst exhibits relatively higher catalytic activity than those reported in the literature for the photodegradation of TC in the water.…”

Synthesis of Cu Nanoparticles Incorporated Mesoporous C/SiO2 for Efficient Tetracycline Degradation

“…Electrostatic interaction between Cu/C-SiO 2 and TC plays a primary role in the adsorption under pH < 7.7. When pH is greater than 7.7, the adsorption capacity decreases with the increase in solution pH, which is attributed to the electrostatic repulsion between Cu/C-SiO 2 and TC since TC is negatively charged when pH > 7.7 (Figure S6d) [54]. Solution pH has a relatively small effect on the degradation of TC, and the total R.E.…”

Polyethyleneimine-Sulfur Quantum Dot Composites for Dual-Channel Detection of Tetracycline by Colorimetric and Fluorescence Sensing

“…As a broad-spectrum antibiotic, tetracycline (TC) is often used for clinical treatment, forestry, and animal husbandry, as well as animal medication. 1,2 However, the excessive abuse of TC aggravates the evolution of drug resistance and also poses a great risk to the ecological environment after discharged wastewater treatment. 3,4 The current detection methods of TC usually include HPLC, capillary electrophoresis, and electrochemistry.…”

“…As a broad-spectrum antibiotic, tetracycline (TC) is often used for clinical treatment, forestry, and animal husbandry, as well as animal medication. , However, the excessive abuse of TC aggravates the evolution of drug resistance and also poses a great risk to the ecological environment after discharged wastewater treatment. , The current detection methods of TC usually include HPLC, capillary electrophoresis, and electrochemistry. − Considering the experimental cost and the environmental contamination from a large volume of organic mobile phase of HPLC, as well as the poor reproducibility of electrochemistry, the fluorescent sensor is definitely the most promising detection method because of its convenience of operation and speed of detection . A variety of fluorescent sensors for the detection of TC have been reported, most of which are based on carbon quantum dots doped with N and S atoms. , These carbon dots have excitation-dependent fluorescence, which may be important for certain practical applications, but their relatively poor color purity and broad emission spectra seriously limited their practical application. , …”