Yang Shuyi,Xing Zhenqiang,E Tao,Liu Lin,Qian Jianhua
Organic reagent is considered as one of the most promising reductants for deeply removing vanadium (V) trichloride oxide (VOCl 3 ) from crude titanium tetrachloride (TiCl 4 ). Nevertheless, indeterminate active component and unclearly removal mechanisms appear to be the obstacles to separate VOCl 3 from TiCl 4 using organic reagent. Herein we conduct the experiment to explore it. Firstly, the organic reagents are obtained from enterprise (noted as EOR 1 –EOR 7 ), and then it is determined that carbon aromatic (C A ) is the active component for removing VOCl 3 . Furthermore, modified organic reagents (noted as MOR 1 –MOR 4 ) are prepared via adding aromatic hydrocarbon oil and stearic acid to EOR 7 , then indicating that MOR 3 is endowed with the best capacity to remove VOCl 3 . In addition, the residues obtained from distillation experiment are comprehensively analyzed (using X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM) etc.), revealing that porous amorphous carbon that deriving from MOR, plays an excellent role in removing VOCl 3 from TiCl 4 system. Therefore, the removal mechanisms can be explained like that porous amorphous carbon reduces VOCl 3 into insoluble vanadium (III) chloride (VCl 3 ) and vanadium (IV) oxide dichloride (VOCl 2 ), and then they are separated via adsorption process, with the help of porous amorphous carbon.
Lei Xiang,Qian-Wen Wang,Wen-Jun Wu,Nian-Jue Zheng,Bai-Lin Liu,Yan-Wen Li,Quan-Ying Cai,Hai-Ming Zhao,Ce-Hui Mo,Qing X. Li
Mining activities release a substantial quantity of toxic metals and organic flotation reagents into the aquatic environment, causing severe pollution and potential health risks. However, the synergisms and mechanisms associated with these mixed pollutants are largely overlooked. The combined application of atomic force microscopy, high-resolution mass spectrometry, nuclear magnetic resonance spectroscopy, isothermal titration calorimetry, and quantum chemical calculations revealed that that cadmium (Cd) is capable of forming tridentate coordination complexes with typical organic beneficiation reagents, namely xanthates (ethyl xanthate, isopropyl xanthate, and butyl xanthates). The resulting complexes exhibited symmetrical trigonal pyramidal structures, with the complexation composed of 4 σ bonds and 1.5 π bonds. The formation of such complexes significantly enhanced the bioavailability of Cd, thereby increasing the accumulation of Cd in hydroponically grown Chinese cabbage seedlings by up to 2.8-fold. Furthermore, it significantly inhibited the xanthates degradation, thereby augmenting their environmental persistence. Therefore, the coexistence of Cd and xanthates, particularly ethyl xanthate, caused significant synergistic toxic effects on Chinese cabbage seedlings. This was characterized by exacerbation of membrane lipid peroxidation damages and suppression of photosynthesis and transpiration, achieved through the inhibition of electron transport, stomatal conductance, and transpiration rate. These findings offer novel insights into the synergisms and mechanism of flotation organic reagents and toxic metals, which are essential to ensuring aquatic environment safety and human health.
危险品化学品经营许可证（带存储）