Adsorbent for selectively removing Cr (VI) as well as preparation method and application thereof
An adsorbent and selective technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of difficult to achieve effective separation of Cr, poor adsorption performance of hydrogel, unfriendly environment, etc. problems, to achieve good adsorption selectivity, good adsorption performance, and simple synthesis steps
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Embodiment 1
[0046] 1. Synthesis of amino-functionalized graphene nanocomposite adsorbents
[0047] The modified Hummers method (W.S.Hummers, R.E.Offeman, Preparation of Graphical Oxide, J Am Chem Soc 80(6) (1958) 1339-1339) was used to deeply oxidize 325 mesh graphite powder to obtain graphite oxide with a concentration of 8.2 mg / mL Aqueous dispersion of olefin (GO).
[0048] Amino-functionalized graphene nanocomposites (TAGNs) were prepared by a one-step low-temperature reaction. In a typical procedure, an initial 8.2 mg / mL graphene oxide dispersion was diluted to 2 mg / mL, with 50 mL of ultrasonic dispersion to form a homogeneous suspension. Subsequently, 0.5 g of thiourea was added to the above homogeneous mixture and stirred for 30 min. After that, 250 μL of APTMS (3-aminopropyltrimethoxysilane) was injected with a constant volume pipette and stirred for 30 min. The obtained solution was transferred into a glass bottle, sealed, and then treated in an electric oven at 90° C. for 6 hou...
Embodiment 2
[0055] 1. Synthesis of amino-functionalized graphene nanocomposite adsorbents
[0056] The synthetic method of the adsorbent in this example is the same as that in Example 1.
[0057] 2. Cr(VI) adsorption process
[0058] Preparation of Cr(VI)-containing solution: Weigh 0.2829 g of potassium dichromate dried at 110°C for 2 hours, dissolve in water, transfer to a 100-mL volumetric flask, and dilute with deionized water to a 1000 mg / L Cr(VI)-containing solution. Dilute with deionized water to 40mg / L, 80mg / L, 120mg / L, 160mg / L, 200mg / L, 240mg / L, 280mg / L, 320mg / L containing Cr(VI) solution, and add concentrated The pH was adjusted to 2 with hydrochloric acid.
[0059] Take 10 mL of the above-mentioned Cr(VI)-containing solutions of different concentrations in a centrifuge tube, add 10 mg of the adsorbent prepared in this example, and adsorb for 3 hours at 25 ° C and 220 rpm mechanical vibration to ensure that the adsorbent and the water phase are sufficient. Contact, centrifugal...
Embodiment 3
[0061] 1. Synthesis of amino-functionalized graphene nanocomposite adsorbents
[0062] The synthetic method of the adsorbent in this example is the same as that in Example 1.
[0063] 2. Cr(VI) adsorption process
[0064] Preparation of Cr(VI)-containing solution: Weigh 0.2829 g of potassium dichromate dried at 110°C for 2 hours, dissolve in water, transfer to a 100-mL volumetric flask, and dilute with deionized water to a 1000 mg / L Cr(VI)-containing solution. Then diluted with deionized water to 80mg / L Cr(VI)-containing solution. Concentrated hydrochloric acid or aqueous sodium hydroxide solution is added to the above-mentioned Cr(VI)-containing solution to adjust the pH to 1-10, respectively.
[0065] The main forms of Cr(Ⅵ) in aqueous solutions with different pH values are: when pH≤7, Cr(Ⅵ) takes the form of HCrO. 4 - , Cr 2 O 7 2- exists, with HCrO 4 - Mainly; when pH≥7, Cr(VI) is CrO 4 2- , HCrO 4 - exists, with CrO 4 2- main.
[0066] Take 10 mL of the ...
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