Attapulgite-loaded zirconium oxide adsorbent and preparation and detection method thereof
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A technology of attapulgite and zirconia, applied in chemical instruments and methods, preparation of test samples, adsorption water/sewage treatment, etc., can solve problems such as weak adsorption, achieve improved stability, fast adsorption speed, and stable operation Effect
Active Publication Date: 2020-08-25
HOHAI UNIV
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However, in the study of clay minerals, most of the materials only have good affinity for phosphate a
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Embodiment 1
[0038] Implementation example 1: the preparation method of the attapulgite loaded zirconia adsorbent, comprising the following steps:
[0039] 1. Pass the off-white powdery attapulgite through a 400-mesh sieve to obtain fine-grained solids of uniform size.
[0040] 2. Add the attapulgite powder obtained in step 1 into about 100 mL of deionized water, and stir with a hand-held homogenizer until a viscous suspension is formed. Again.
[0041] 3. Add zirconium oxychloride to the suspension obtained in step 2, adjust the pH to about 7.0 with 25% ammonia water while stirring, and the quality of the added zirconium oxychloride is 1 / 8 of the attapulgite.
[0042] 4. Use a hand-held homogenizer to stir the suspension in step 3 at high speed, set the rotation speed to 12500 rpm, and stir for 15 minutes.
[0043] 5. After the stirring in step 4 is completed, let it stand for about 1 hour, pour off the supernatant, and rinse the sediment with 400mL deionized water continuously for 7 da...
Embodiment 2
[0049] Implementation example 2: the adsorption effect of the prepared material
[0050] 1. Prepare As(III) and As(V) aqueous solutions with a concentration of 200ug / L and a volume of 10mL, and add 0.05g of the prepared adsorbent and attapulgite to the prepared As(III) and As(V) respectively. ) aqueous solution, placed in a constant temperature oscillator at 25°C (rotating speed: 160rpm) for 2 hours, then took out the suspension and filtered it with a 0.45 μm filter membrane, and finally measured the concentration of the filtrate with an atomic fluorescence spectrometer.
[0051] 2. combine image 3 From the given adsorption rate histogram, it can be seen that the adsorption rate of the attapulgite natural material for As(III) can reach about 75%, while the adsorption rate for As(V) is only 7%. It can be considered that the attapulgite As(V) There is almost no affinity, and the removal rate of the modified adsorbent for As(III) and As(V) is almost 100%, and the adsorption eff...
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Abstract
The invention relates to an attapulgite-loaded zirconium oxide adsorbent and a preparation and detection method thereof. The preparation method comprises the steps: screening powdery attapulgite and adding into deionized water to be mixed, then adding zirconium oxychloride for mixing, and obtaining a suspension; stirring and adjusting the pH to be neutral by using ammonia water; then homogenizingand dispersing the suspension liquid; standing until layering, pouring out the supernatant, and continuously flushing the precipitate with deionized water until chloride ions and ammonium ions are completely flushed; and centrifuging the precipitate by using a centrifuge, pouring out the supernatant, drying in a drying oven, and grinding and sieving to obtain the zirconium oxide modified attapulgite. According to the detection method, the improvement effect of the adsorption rate of the material before and after modification can be rapidly and accurately quantified through simple constant-temperature oscillation, filtration, atomic fluorescence detection and other operations. The adsorption efficiency of As (V) and As (III) in a dissolved state is high, the adsorption speed is high, and the requirements on a water body arsenic pollution treatment reaction system are greatly reduced.
Description
technical field [0001] The invention relates to an adsorbent of zirconia loaded on attapulgite rods and a preparation and detection method thereof, belonging to the technical field of adsorbents. Background technique [0002] In recent years, with the rapid development of the economy, the pollution of heavy (like) metals in water is becoming more and more serious, which is a great threat to human life and health. Among them, arsenic is a metalloid that can cause cancer. When the human body ingests low doses of arsenic, it will cause cancer and even death in various organs. Therefore, the treatment of arsenic pollution in water has attracted widespread attention. [0003] At present, the treatment of arsenic pollution in water body includes biofilm method, oxidation method, ion exchange method, precipitation method, adsorption method, extraction method, coagulation / electroflocculation method, etc. Among them, the adsorption method is simple because of its simple operation met...
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