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A new mixed organic acid of citric acid and salicylic acid is proposed to recover valuable Co and Li ions from spent LIBs. Under the optimum leaching conditions, the leaching efficiencies of Co and Li ions can reach 99.5% and 97%.

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This text was mainly studied the extraction flavonoids technology from Momordia cochinchinensis seeds. The optimum extraction condition was as follows: when the ratio of liquid to solid was 20:1, the ethanol concentration was 90% and the extraction time was 2h. Under this condition, the actual average yield of flavonoids could reach 0.363%.

In this paper, we reported green-emission carbon dots (CDs) using a single step hydrothermal carbonization. The CDs were prepared by m-phenylenediamine, tris, phosphoric acid, and pure water by heating for 8 h at 180 ℃. The CDs exhibited green-emission fluorescence, were sensitive to pH, and was successfully used analysed the pH of real water samples. Besides, the CDs could detect of food additive lemon yellow, with the limit of detection as low as 0.13 μM. More importantly, the CDs could be used as an antioxidant to remove superoxide anions (O2-) and hydroxyl radicals (–OH). The linear range of CDs concentrations for superoxide anion and hydroxyl radicals were 0 - 300 mg/mL and 0 - 14 mg/mL, respectively. In addition, the CDs could be a fluorescnet reagent in bioimaging of beer yeast, mould and onion skins. The favorable pH, optical properties, antioxidant ability, and bioimaging ability ensure the CDs can be exploited in food analysis and other fields.

Nowadays, Mg based metals attract much attention because of their biodegradability and bioactivity. However, over fast degradation rate still restrict their widely medical application. Therefore, surface protection treatment is necessary to control the degradation rate. In this study, a ceramic coating was successfully fabricated on pure magnesium by Micro-arc oxidation (MAO) method. The surface quality was dramatically influenced by deposition parameters such as voltage and frequency. The composition of the sample was characterized by X-ray diffraction (XRD) and the surface morphology was characterized by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). The degradation behavior of MAO coated Mg was investigated. It is expected that pure Mg with MAO coating can be used for the orthopedic application especially as bone screw.

Water quality directly affects human health. It is very important to design a probe that can detect the pollutants in water. In this study, we synthesized one kind of carbon dots (CDs), which could emit strong blue fluorescence. The blue fluorescence could be quenched by 2,4,6-trinitrophenol (TNP) ascribed to the energy transfer (ET), could be quenched by lemon yellow (LY) ascribed to inner filter effect (IFE), and could be quenched by HClO ascribed to surface passivation (SP). TNP, LY, and HClO are common contaminants in water. By our experiment, it was proved that the synthesized CDs are a safe and effective fluorescent material and could be used to detect the pollutants (TNP, LY, and HClO) in the actual water sample.