Adsorbent for removing hexavalent chromium in drinking water and its preparation method and application
A technology of hexavalent chromium and adsorbent, which is applied in the field of water pollution control, can solve the problems that do not involve the removal of chromium ions in drinking water, the composition of the adsorbent is complex, the preparation process is complex, etc., and the equipment requirements are low and the physical and chemical stability is achieved. Strong, easy-to-prepare effect
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Embodiment 1
[0032] Embodiment 1 prepares adsorbent of the present invention
[0033] Weigh 1.23g chitosan and add it into 150ml 10% acetic acid solution by mass percentage, and stir for 1h. Then weigh 8.3934g of FeCl 3 ·6H 2 O and 3.0876 g FeCl 2 4H 2 O was added to the above solution, mixed and stirred until a uniform dark red liquid was produced, and then this solution was added dropwise to 600ml of 30% by mass NaOH solution, and fully stirred and reacted at room temperature for 1h. Cool, stand still, filter, then wash with deionized water until the pH of the suspension is about 7, filter, put the filtered product in an oven at 60°C to dry to constant weight, and dry to obtain the finished adsorbent.
[0034] The SEM figure, XRD figure and infrared spectrum of gained adsorbent are as figure 1 , figure 2 , image 3 As shown, its physical and chemical stability is strong. The obtained adsorbent has good magnetism, and the saturation magnetization can reach 19.44emu / g, and it can ...
Embodiment 2
[0035] The influence of embodiment 2 different reaction times on the application effect of adsorbent of the present invention
[0036] Under room temperature conditions, the initial chromium concentration of the 100mL solution with 100mg of the adsorbent prepared in Example 1 is 2mg L -1 The aqueous solution is subjected to adsorption reaction, wherein the reaction time is controlled at 5, 10, 20, 60, 120, 300, 900, 1440min. The reacted mixed solution was filtered and collected in a dry beaker, and the concentration of chromium ions in the filtrate was determined by spectrophotometry. Table 1 shows the solution concentration and adsorption rate of chromium ions under different reaction times.
[0037] The different reaction time of table 1 is to the influence of adsorbent application effect of the present invention
[0038] Adsorption reaction time (min)
[0039] It can be seen from this that the adsorbent of the present invention has a fast adsorption speed to chr...
Embodiment 3
[0040] The application effect of adsorbent of the present invention in different chromium ion initial concentration solutions of embodiment 3
[0041] At room temperature, use 100 mg of the adsorbent prepared in Example 1 to perform an adsorption reaction on 100 mL of hexavalent chromium solution for 24 hours; set up six gradients in the hexavalent chromium solution according to the initial chromium ion concentration within the range of 0.1-10 mg / L deal with. The concentration of chromium ions was measured by spectrophotometry. Table 2 shows the adsorption rate and amount of chromium ions of the adsorbent at different initial concentrations of chromium ions.
[0042] The adsorption performance of the adsorbent of the present invention on hexavalent chromium ions decreases with the increase of the concentration of chromium ions. When the concentration of chromium ions in the solution is low, that is, when the initial concentration is 0.1-2mg / L, the adsorption rate reaches 97.7 %...
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