Arsenic removal adsorbent and preparation method thereof
A technology of adsorbent and solution, which is applied in the field of arsenic removal adsorbent and its preparation, can solve the problems of low adsorption capacity, slow adsorption rate, and single composition, and achieve the effects of high adsorption rate, low crystallinity, and good practicability
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[0049] A preparation method of an arsenic-removing adsorbent, comprising the following steps:
[0050] (1) Add solution 2 dropwise to solution 1 until it becomes a gray-green suspension, stop dripping the solution 2, stir until it turns brown, continue stirring for more than 12 hours to obtain KMnO 4 @Fe-BTC mother liquor;
[0051]Wherein, the solution 1 contains Fe salt and KMnO 4 ;
[0052] Described solution 2 contains trimesic acid and alkaline substance;
[0053] (2) adding N,N-dimethylformamide to the mother liquor, stirring until fully mixed, suction filtration, and drying to obtain a filter cake;
[0054] (3) Dissolving the filter cake in absolute ethanol, performing ultrasonic treatment, and centrifuging again to obtain a precipitate; washing and centrifuging the precipitate, and drying to obtain the arsenic-removing adsorbent.
[0055] Preferably, in the step (1), the Fe salt is FeSO 4 ·7H 2 O, the alkaline substance is NaOH.
[0056] Further preferably, in th...
Embodiment 1
[0072] The specific operation steps are as follows:
[0073] (1) 1.39g (5mmol) FeSO 4 ·7H 2 O and 0.63-0.95g (4-6mmol) KMnO 4 Dissolve in 40-60 ml of deionized water to give solution 1.
[0074] 0.32-0.48 g of trimesic acid and 0.4 g of NaOH were dissolved in 20 mL of deionized water, and stirred until clear to obtain solution 2.
[0075] Add solution 2 dropwise to solution 1, keep stirring during the whole process, after the system becomes a gray-green suspension, stop adding solution 2 dropwise, the mixed solution is kept stirring at room temperature, the solution turns brown after the reaction for 5-6 hours, and then continues After more than 12h reaction, KMnO can be obtained 4 @Fe-BTC's mother liquor.
[0076] (2) 15 mL of N,N-dimethylformamide was added to the solution after the reaction was completed, and after stirring with a magnetic stirrer for 2 h at room temperature, suction filtration was performed with a 0.22 μm filter membrane to obtain a brown filter cake,...
Embodiment 2
[0080] The specific operation steps are as follows:
[0081] (1) 1.39g FeSO 4 ·7H 2 O and 0.63gKMnO 4 Dissolve in 40 ml of deionized water to give solution 1.
[0082] 0.32 g of trimesic acid and 0.4 g of NaOH were dissolved in 20 mL of deionized water, and stirred until clear to obtain solution 2.
[0083] Add solution 2 dropwise to solution 1, keep stirring during the whole process, after the system becomes a gray-green suspension, stop adding solution 2 dropwise, the mixed solution is kept stirring at room temperature, the solution turns brown after 6 hours of reaction, and the reaction is continued for 12 hours Above, you can get KMnO 4 @Fe-BTC's mother liquor.
[0084] (2) 15 mL of N,N-dimethylformamide was added to the solution after the reaction was completed, and after stirring with a magnetic stirrer for 2 h at room temperature, suction filtration was performed with a 0.22 μm filter membrane to obtain a brown filter cake, and the filter cake was at 50 Dry at ℃ f...
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