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AgCl/Bi25 Fe040 composites loaded with different mass fractions of AgCl were prepared by the hydrothermal-sonochemical method. The microstructure, crystal phase composition and optical absorption properties of the composites were characterized by XRD, SEM-EDS, UV-Vis DRS and PL spectra. The photocatalytic degradation of Rhodamine B was also carried out. The results showed that Bi25 Fe040 was a cubic structure with a diameter of 0. 8 ~ to µm. AgCl was uniformly loaded on Bi25 Fe040 with a diameter of 90 ~ 130 nm. The combination of the two materials broadens the photo response range of the single material and improves the photocatalytic activity of Bi25Fe040. 0. 1 g AgCl/Bi25Fe040 was added to degrade 100 mL 15 mg/ L Rhodamine B solution, when the mass fraction of loaded AgCl was 51. 8 %, the degradation rate reached 94. 4% in 75 min and Rhodamine B could be completely degraded in 90 min. In addition, the degradation mechanism of AgCl / Bi25Fe040 was analyzed. It was considered that h +, e -, H20 2 and· 0 2 - are the main active groups of the photocatalysis system to degrade Rhodamine B. [ABSTRACT FROM AUTHOR]

BACKGROUND The contents of silver, tin, boron, molybdenum, and lead in geological samples are extremely important for studying the metallogenic regularity and for geochemical prospecting. Current analytical methods rarely determine silver, tin, boron, molybdenum, and lead simultaneously. OBJECTIVES To establish a method to simultaneously determine silver, tin, boron, molybdenum and lead in geological samples. METHODS To eliminate the matrix interference, first-class standard materials (rock, soil and water sediments) were used for linear fitting of the synthetic silicate standard materials curve. By setting analytical line conversion values, different analytical line can be used for samples with different contents. RESULTS The detection limits of silver, tin, boron, molybdenum, and lead were 0.0077μg/g, 0.19μg/g, 0.68μg/g, 0.058μg/g, 0.49μg/g, respectively. The precisions of the method were 3.23%-9.39%. The measured value of national first class standard materials including soil, water sediments and rock by this method was in accordance with standard values, with an absolute value of △logC < 0.10. The qualified rates of actual sample were 92%-98%, and the qualified rate of the inspection sample was 100%. CONCLUSIONS This method is easy to apply and can be used to analyze samples rapidly. It can also be used to avoid contamination during sample dilution. Compared with traditional atomic emission spectrometry that uses a single analytical spectrum line, this method can be used to obtain a value which is closer to the standard value of national standard materials. The detection limit of this method is much lower than the standard value of the specification of testing quality management for geological laboratories.

BACKGROUND: The contents of silver, tin, boron, molybdenum, and lead in geological samples are extremely important for studying the metallogenic regularity and for geochemical prospecting. Current analytical methods rarely determine silver, tin, boron, molybdenum, and lead simultaneously. OBJECTIVES: To establish a method to simultaneously determine silver, tin, boron, molybdenum and lead in geological samples. METHODS: To eliminate the matrix interference, first-class standard materials (rock, soil and water sediments) were used for linear fitting of the synthetic silicate standard materials curve. By setting analytical line conversion values, different analytical line can be used for samples with different contents. RESULTS: The detection limits of silver, tin, boron, molybdenum, and lead were 0.0077μg/g, 0.19μg/g, 0.68μg/g, 0.058μg/g, 0.49μg/g, respectively. The precisions of the method were 3.23%-9.39%. The measured value of national first class standard materials including soil, water sediments and rock by this method was in accordance with standard values, with an absolute value of ΔlogC<0.10. The qualified rates of actual sample were 92%-100%, and the qualified rate of the inspection sample was 100%. CONCLUSIONS: This method is easy to apply and can be used to analyze samples rapidly. It can also be used to avoid contamination during sample dilution. Compared with traditional atomic emission spectrometry that uses a single analytical spectrum line, this method can be used to obtain a value which is closer to the standard value of national standard materials. The detection limit of this method is much lower than the standard value of the specification of testing quality management for geological laboratories. [ABSTRACT FROM AUTHOR]