A kind of method that hydrothermal method prepares orpiment crystal
A technology of hydrothermal method and orpiment, which is applied in chemical instruments and methods, arsenic compounds, inorganic chemistry, etc., can solve the problems of long reaction time, high energy consumption, and complicated preparation of raw materials, and achieve reduced leaching toxicity and low energy consumption , The effect of simple process
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Embodiment 1
[0029] Weigh 9.0g sodium sulfide nonahydrate and 3.25g sodium arsenite, the molar ratio of sulfur to arsenic is 3:2, put it in 500mL (0.92MH 2 SO 4 ) aqueous solution, fully reacted at room temperature for 24 hours, filtered and washed with water, dried in vacuum at 50° C., and ground to obtain amorphous arsenic trisulfide powder. according to figure 1 , figure 2 , the synthesized product is amorphous amorphous arsenic trisulfide with loose structure and small particles.
[0030] Take 1.0g of arsenic sulfide powder and place it in a 25mL hydrothermal reaction kettle, add 5mL of water with a pH of 2 adjusted with HCl, and react at 210°C for 48h to obtain orpiment crystals. Depend on image 3 It can be seen that, through the hydrothermal reaction, the amorphous arsenic trisulfide is transformed into spherical particles of a certain size, and the columnar crystals grow radioactively on the surface, and the spherical particles tend to agglomerate.
Embodiment 2
[0032] The preparation method is the same as in Example 1, except that the solid-to-liquid ratios of amorphous arsenic trisulfide and water in Example 2 are 1:1, 1:3, 1:7, and 1:9, respectively. Depend on Figure 4 , with the solid-liquid ratio from (1:1) g / mL to (1:9) g / mL, the intensity of the diffraction peak of orpiment increases gradually, and the crystal form is good.
Embodiment 3
[0034] The preparation method is the same as in Example 1, except that the pH values in Example 3 are 5.0, 7.0, 9.0, and 12.0, respectively. according to Figure 5 , as the pH increases, the particle surface gradually transforms from radioactive prisms / needles to inhomogeneous, irregular particles or sheet accumulation, and the crystal form becomes worse.
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