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Anonymous users2024-02-08Why does the pH increase when roasted hydrotalcite is put into water.
Carbonate-type hydrotalcite (LDH) with mg Al of 3 was synthesized by the traditional supersaturated double-drop method, and the roasted products (CLDH) were prepared by calcination at 500 degrees Celsius, and they were characterized by X-ray, infrared spectroscopy and electron microscopy. The effects of roasting temperature, reaction time, pH, dosage, reaction temperature and initial concentration on the adsorption of acid chromium blue K simulated wastewater by roasted hydrotalcite were investigated. The results showed that for 100 mg L of chromium blue K solution, 500 roasted hydrotalcite, the dosage was 0 06g, the reaction was about 3 5 at pH = 3 5, and the removal rate was up to 98 or more at room temperature.
The removal rate of chromium blue K by CLDH is still more than 90, and CLDH is a good environmentally friendly adsorption material.
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Anonymous users2024-02-071. Decolorization of printing and dyeing wastewater.
Hydrotalcite materials and their roasting products show very good adsorption properties to dyes and are widely used due to their low cost.
2. Removal of halogen ions in wastewater.
The anion exchange capacity of hydrotalcite is related to the anion species between the layers, and the order of the interlayer anion exchange is CO32->OH->SO42->HPO42->F->C1->br->NO3->I-. It can be seen that ** anions are easily exchanged into the hydrotalcite layer, and low-valent anions are easily exchanged.
3. Removal of phosphate in eutrophic water.
In eutrophic waters, phosphate is one of the main pollutants. Also due to the fact that ** anions are easily exchanged in.
HTLCS interlayer, so that phosphate ions can be removed and recycled using hydrotalcite**.
4. Removal of heavy metal complexes in wastewater.
1) Removal of heavy metal ions in the form of complexed anions.
2) Removal of heavy metal cations.
5. Advanced oxidation of organic matter in water bodies.
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Anonymous users2024-02-06The application of hydrotalcite materials in wastewater mainly takes advantage of the excellent characteristics of hydrotalcite, such as interlaminar ion exchange performance, large specific surface area and structural memory effect.
Hydrotalcite materials have good adsorption properties for dyes, and the adsorption properties of the roasted products are better for the decolorization of wastewater, and the adsorption properties of the roasted products are better, and the products regenerated by high-temperature pyrolysis method after adsorption saturation still have better adsorption properties, and the hydrotalcite roasting products have better dye adsorption effects on hydrotalcite.
The use of hydrotalcite or hydrotalcite roasting products for adsorption-roasting regeneration to treat wastewater not only has a good effect, but also can realize the repeated use of adsorption materials and reduce their preparation costs.
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Anonymous users2024-02-05As an adsorbent material for the treatment of complex wastewater components.
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