Capture gaseous arsenic in flue gas by amorphous iron manganese oxides with high SO2 resistance.

In non-ferrous metal smelting, the problem of gaseous arsenic in high-sulfur flue gas is difficult to solve. Now we have developed oxygen-enriched amorphous iron manganese oxide (AFMBO) based on the unique superiority of iron-manganese oxide for arsenic capture to realize the effective control of gaseous arsenic in the non-ferrous smelting flue gas. The experimental results show that the arsenic adsorption capacity of AFMBO is up to 102.7 mg/g, which has surpassed most of the current adsorbents. In particular, AFMBO can effectively capture gaseous arsenic even at 12% v/v SO2 concentrations (88.45 mg/g). Moreover, the spent AFMBO possesses pronounced magnetic characteristics that make it easier to separate from dust, which is conducive to reducing the secondary environmental risk of arsenic. In terms of mechanism study, various characterization methods are used to explain the important role of lattice oxygen and adsorbed oxygen in the capture process of gaseous arsenic. Moreover, the reason for the efficient arsenic removal performance of AFMBO is also reasonably explained at the microscopic level. This study provides ideas and implications for gaseous arsenic pollution control research.

The determinants of effective defluorination by the LiAl-LDHs.

Millions of people in poor areas are still under the threat of fluoride contamination. How to effectively separate fluorine in water is an important step to reduce the ecological risk. In this paper, we performed a systematic DFT calculation focused on the defluorination behavior between the LiAl- and MgAl-LDHs. The results indicated that the LiAl-LDHs exhibited high chemical activity before the defluorination, because of the better electronic structure. After the defluorination, the LiAl-LDHs with adsorbed-F- were also more stable than the MgAl-LDHs. In addition, the existence of coordination covalent bond for the adsorbed-F- attached to the LiAl-LDHs was confirmed. This is an important reason for the high defluorination efficiency by the LiAl-LDHs. In addition, a series of weak interaction, including hydrogen bond and van der Waals interaction were also observed. Finally, a LiAl-LDHs with excellent fluoride removal properties were synthesized well by simple hydrothermal method. The results showed that our synthesized LiAl-LDHs with the capacity of 156.09 mg/g, could be effectively defluorinated in water. Notably, it surpasses most materials and has potential applications.

[A prompt method to quantitative assay of alpha-Gal on pig cell surface without injury].

OBJECTIVE: To develop a method for quantitative assay of alpha-Gal on pig cell surface. METHODS: After centrifugation of the anticoagulated blood samples, the white blood cell layer was collected for addition of FITC-BSIB4 and analysis using FCM as well as Laser Scan Confocal Microscope (Bio-Rad). RESULTS: With human blood group B as negative control, and mouse myeloma SP2/0 cells as positive control. the peripheral blood cells of two Chinese pigs were all positive, there were about 9.16 x 10(5) alpha-Galactosyl epitopes expressed on the cell-membrane of granulocytes 1.37 x 10(5) on the monocytes of Banna Minipig Inbred Line (BMI), and 1.16 x 10(6) on the granulocyte and 2.45 x 10(5) on the monocytes of Sichuan White Pig (SWP). The levels of alpha-Galactosyl expression on the surface of blood cells in BMI and SWP differed in various cells, the sequence from high to lower expression levels being on the platelets, granulocytes, monocytes, erthrocytes in each species of pig. CONCLUSION: The method is useful for quantitative assay of alpha-Gal on pig cell surface, and the assay may be used for alpha-Gal for on-site large-scaled screening of living pigs.