Anti-Sulfamethoxazole polyclonal antibody

In this study, peracetic acid (PAA) is successfully activated by cobalt ferrite (CoFe2O4/PAA) to remove sulfamethoxazole (SMX). Increasing either PAA (25-200 mu M) or CoFe2O4 (25-200 mg/L) dose accelerated SMX degradation in the CoFe2O4/PAA system, and the best removal of SMX (87.3%) was acquired with 200 mu M PAA and 0.1 g/L CoFe2O4 at neutral condition. Addition of humic acid or HCO3- inhibited SMX removal, whereas Cl- had little impact. The redox cycle of Co3+/ Co2+ on the CoFe2O4 surface dominated PAA activation to produce organic radicals (R-O-center dot) including CH3C(O)O-center dot and CH3C(O)OO center dot accounting for SMX degradation. Based on the density functional theory (DFT) calculation and identified oxidation products, SMX transformation pathway was proposed to be initiated by electron transfer reaction with R-O-center dot. The insignificant variation of acute toxicity, the fine CoFe2O4 stability and the good removal of some other micro-organic pollutants suggested the potential applicability of the CoFe2O4/PAA system in degrading micro-organic pollutants.

In this study, a bimetallic Cu-0/Zn-0 particles were prepared, characterized and used as Fenton-like catalyst for the degradation of sulfamethoxazole (SMX). The results showed that Cu-0/Zn-0 particles were capable of converting O-2 to H2O2, center dot O-2(-) and %OH radicals. In bimetallic Cu-0/Zn-0 particles, Cu-0/Zn-0 corrosion cells were formed through the direct contact of Zn-0 and Cu-0, which not only accelerated the electron transfer from Zn-0 to O-2, leading to the promotion of H2O2 generation, but also enhanced the conversion of Cu2+ to Cu+/Cu-0, facilitating the catalytic decomposition of H2O2 to produce center dot O-2(-) and %OH radicals. SMX could be efficiently degraded in Cu-0/Zn-0-air system over a broad pH range from 3 to 9, the removal efficiency of SMX and TOC was 87.8% and 45.5%, respectively at following condition: SMX concentration, 20 mg/L; dosage of bimetallic Cu-0/Zn-0 particles (mole ratio of Zn to Cu was 1:2), 2 g/L; air flow rate, 1.8 L/min; reaction temperature, 25. and without adjusting pH. The recycling use of bimetallic Cu-0/Zn-0 particles leaded to the enhanced degradation of SMX due to the newly formed cuprous oxide (Cu2O), which could further catalytically activate O-2. The quenching experiment showed that the concentration of dissolved oxygen could significantly affect the main reactive oxidant species (ROSs). Additionally, the intermediate products of SMX degradation were detected and a possible pathway of SMX degradation as well as the catalytic mechanism of Cu-0/Zn-0-air system were proposed.