Composite bentonite material capable of quickly identifying hexavalent chromium ions in water with naked eyes as well as preparation method and application of material
A technology of hexavalent chromium ions and bentonite, which is applied in the direction of analyzing materials through chemical reactions, material analysis through observing the influence of chemical indicators, chemical instruments and methods, etc., can solve the problem of complex pretreatment methods and equipment Expensive, inconvenient and popular use, etc., to achieve the effect of low cost, low labor intensity, and health protection
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Embodiment 1
[0035] A composite bentonite material that can quickly identify and detect hexavalent chromium ions in water with naked eyes. The core of the material is hydrophobic nano-organic modified bentonite, and the core is connected with the color developer diphenylcarbazide through its hydrophobic carbon chain. , the hydrophobic nano-organic modified bentonite is modified by quaternary ammonium salt, the content of montmorillonite is more than 88%, the cation exchange capacity is 80-130mmol / 100g, and the whiteness is 76-95. Described quaternary ammonium salt is tetramethylammonium chloride, tetraethylammonium chloride, tetrabutylammonium chloride, dodecyl quaternary ammonium salt, hexadecyl quaternary ammonium salt and octadecyl quaternary ammonium salt at least one of the
[0036] The preparation method of above-mentioned composite bentonite material comprises the steps:
[0037] (1) Weigh the color developer and hydrophobic nano-organic modified bentonite at a weight ratio of 1:2 ...
Embodiment 2
[0040] Rapid detection application process: Weigh 10.0g of hydrophobic nano-organic modified bentonite modified by quaternary ammonium salt and 1.0g of chromogenic agent diphenylcarbazide, the mass ratio is 10:1, and place in a clean 250mL Add 100mL of distilled water into a Erlenmeyer flask, place it on a magnetic stirrer at 5-50°C and stir for 1 hour, and form a slurry for later use.
[0041] Take 5mL of the above slurry with a clean pipette gun, evenly drop it on the new 0.22μm nitrocellulose membrane in the vacuum filter device, spread it evenly to form a uniform membrane with a thickness of 0.5-20mm, and clean it with pure water The composite bentonite material is washed multiple times to remove excess impurities.
[0042] Add 100mL of hexavalent chromium ion solution (pH=1~4) containing standard serial concentrations into the upper container of the vacuum filter one by one, from low to high concentration, and pass through the newly prepared composite bentonite one by one...
Embodiment 3
[0047] (1) Weigh 10.0 g of sodium dodecylsulfonate modified nano-bentonite and 1.0 g of chromogenic agent diphenylcarbazide, and place them in a clean 250 mL Erlenmeyer flask at a mass ratio of 1:10 100 mL of distilled water was added, placed on a magnetic stirrer at 5-50° C. and stirred for 1-5 hours, and a slurry was formed for later use.
[0048] (2) with standard addition method, in 600mL of distilled water, add certain potassium dichromate, accurately measure 3 parts of volume and be 100mL to be tested liquid and 3 parts of volume are the detection solution of 100mL as precise testing equipment;
[0049] (3) 3 parts of volumes in step (2) are 100mL as the detection solution of precise detection equipment to carry out accurate detection, and its average value is used as the hexavalent chromium concentration value of this test solution;
[0050] (4) According to the following steps, respectively pass three portions of the liquid to be tested in step (2) with a volume of 100...
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