Preparation method of manganese dioxide/iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent and application of three-dimensional silicon dioxide adsorbent in As (III) adsorption
A technology of ferric oxyhydroxide and manganese dioxide, which is applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., and can solve the problem of limited metal ion adsorption performance, poor heavy metal adsorption selectivity, and low adsorption capacity, etc. problems, achieve good reusability, novel modified adsorbent, and large adsorption capacity
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Embodiment 1
[0034] Example 1 Three-dimensional silica adsorbent MnO loaded with manganese dioxide / iron oxyhydroxide 2 / FeOOH / KIT-6 (1) The preparation method is as follows
[0035] 1. Preparation of three-dimensional mesoporous material KIT-6
[0036]Mix 4g triblock copolymer P123, 120g deionized water and 20mL concentrated hydrochloric acid, stir overnight at 35-45°C until dissolved, add 4g n-butanol, continue stirring for 1-3h, then add 8.6g n-butanol dropwise Ethyl silicate, continue to stir for 24-48 hours, then transfer the resulting mixture into a stainless steel reactor, conduct a hydrothermal reaction at 100°C for 24 hours, cool the product naturally to room temperature, filter, wash with water and ethanol until neutral, and dry After that, it was calcined in a muffle furnace at 550°C for 12 hours to obtain the three-dimensional mesoporous material KIT-6.
[0037] 2. Preparation of FeOOH / KIT-6
[0038] 5g three-dimensional mesoporous material KIT-6, 30mL concentration is 0.05mo...
Embodiment 2
[0043] Example 2 Three-dimensional silica adsorbent MnO loaded with manganese dioxide / iron oxyhydroxide 2 Application of / FeOOH / KIT-6 in Adsorption of As(Ⅲ)
[0044] (1) MnO 2 Adsorption effect of / FeOOH / KIT-6 on arsenic under different acidity
[0045] Method: Weigh 10 mg of MnO prepared in Example 1 with different Fe / Mn molar ratios 2 / FeOOH / KIT-6, respectively added to 10mL with a concentration of 20mg·L -1 In the As(III) solution, the pH of the solution was adjusted to 1, 3, 5, 7, 9, 11 respectively, and the adsorption was oscillated at 30°C and 180r / min in an oscillating box for 24h. The result is as Figure 4a and Figure 4b shown.
[0046] Depend on Figure 4a It can be seen that with the increase of the Fe / Mn molar ratio, the adsorption capacity of the adsorbent for As(III) gradually decreases, and the adsorption rate of the adsorbent for As(III) is the largest when the pH is 1. When the pH was 1 and the Fe / Mn molar ratio was 4:5, the adsorption capacity of the...
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