Correction for ‘In situ controllable synthesis of graphene oxide-based ternary magnetic molecularly imprinted polymer hybrid for efficient enrichment and detection of eight microcystins’ by Sheng-Dong Pan et al., J. Mater. Chem. A, 2015, 3, 23042–23052.
The determination of trichlorobenzenes (TCBs) in water-based cutting fluids and wastewater of machining has been carried out. A gas chromatography/mass spectrometry (GC/ MS) method with selected ion monitoring (SIM) mode was employed. The target analyte was extracted from the matrix using dispersive liquid-liquid microextraction. Comparing with gas chromatography/electronic capture detection (GC/ECD) coupled with traditional sample preparation procedures, e.g. head-space extraction, liquid-liquid extraction and solid-phase extraction, the present method was accurate with broader linear range, better enrichment property, better replicability, easier to be operated and less interference. Overall recoveries were 94.7% - 104.3% with the relative standard deviations (RSDs) of at 2.3% - 7.8%. The detective limits for 1,3,5-, 1,2,4- and 1,2,3-trichlorobenzene were 2.0, 6.0 and 3.0 microg/L, respectively. The parameters, such as the nature and volume of extraction solvent, dispersive solvent, extraction time and salt effect, were studied and optimized. Some important factors, e.g., the concentration of common used additives in water-based cutting fluids, which may affect the recoveries and replicabilities for the determination of trichlorobenzenes, have been investigated. The result showed that no significant effects have been observed when the concentrations of NaNO2 and polyethylene glycol (PEG) were up to 1.0%. The present method has been applied for the determination of the trichlorobenzenes in 4 real samples. The result showed that two of them were found to contain these trichlorobenzenes. The TCBs in the samples were 0.15 - 1.67 mg/L.
An ethylenediamine (EDA)-functionalized Fe 3 O 4 magnetic nanochain (EDA@nFe 3 O 4 ) was synthesized by one-pot solvothermal method.The EDA@nFe 3 O 4 was characterized by elementary analysis, powder X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and vibrating sample magnetometer.Its application for adsorption and degradation of 2,4,6-trichlorophenol (2,4,6-TCP) was investigated.The results show that the EDA@nFe 3 O 4 has an average size of ~150 nm, and self-assembled to be a nanochain, with the saturation magnetization intensity of 46.8 emu/g.The adsorption capacity of EDA@nFe 3 O 4 is found to be 902.5 mg/g when the initial concentration of 2,4,6-TCP at 1,000 mg/L.The adsorption processes fit the Freundlich isotherms well.The adsorption processes reach the equilibrium within 5 min and the kinetic data are well fitted to the pseudo-second-order model.The post-adsorbed material was added to Fe 3+ -H 2 O 2 system.In situ degradation of 2,4,6-TCP via Fenton-like reaction under visible light can be realized.The results indicate that at pH 3.0-8.0,the degradation of 2,4,6-TCP with loading concentration at 6.20-122.2mg/g can be reached to almost 100% within 5 min.EDA@nFe 3 O 4 can be reused after regeneration.It is a potential effective and reusable material for adsorption and degradation of 2,4,6-TCP.
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