Preparation method for nylon membrane for adsorbing heavy metals
A technology for adsorbing heavy metals and nylon membranes, applied in the field of nylon membranes, can solve problems that have not been reported yet, and achieve good reusability and regeneration performance, high adsorption capacity and selective adsorption.
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Embodiment 1
[0024] The preparation method of embodiment 1 modified nylon film
[0025] a. Use an analytical balance to weigh 1.9000g of nylon membrane (nylon 66 membrane, purchased from Tianjin Keyilong Experimental Equipment Co., Ltd.) and place it in a 500mL round bottom flask, add 350mL of 1mol / L HCl solution, and place in a constant temperature water bath at 55°C After reacting in the medium for 24 hours, cool down, rinse with deionized water until neutral, then dry at 60°C for 30 minutes, and seal and store for future use.
[0026] b. Take 1.9000g of nylon membrane treated with hydrochloric acid, put it in a 150mL conical flask with a stopper, add CDI anhydrous methanol solution (0.5g / 100mL), react in a water bath at 40°C for 2h, and use Rinse with anhydrous methanol 3 times and dry for later use.
[0027] c. Put the activated nylon membrane above into a 150mL Erlenmeyer flask with a stopper, add an appropriate amount of diethylenetriamine (DETA) solution, and react in a water bath ...
Embodiment 2
[0029] Example 2 Modified Nylon Membrane Static Saturated Adsorption Capacity of Heavy Metal Ions
[0030] Accurately weigh 120.0 mg of the modified nylon membrane prepared in Example 1 and place it in a 150 mL conical flask with a stopper, add 10 mL of acetic acid buffer solution (pH=2 to 6) in a certain pH range and soak for 12 hours, then add 15 mL of a certain concentration ( 0.5 ~ 2.5mmol / L) of heavy metal ion solution, oscillating in a constant temperature oscillator set at a certain temperature (25 ~ 45 ° C), after a certain period of time (0 ~ 180min) to make the adsorption reach equilibrium, accurately pipette the adsorbed 500 μL of water sample was diluted 10 times and passed through 4-sulfophenylporphyrin C 44 h 34 N 4 o 20 S 6 After (TPPS4) derivatization, the concentration of heavy metals in the solution was measured by HPLC, and finally the static adsorption capacity of the modified nylon membrane to heavy metal ions was obtained through calculation.
[0031...
Embodiment 3
[0032] Embodiment 3 adsorption selectivity experiment
[0033] 120 mg of the modified nylon membrane prepared in Example 1 was weighed and placed in the binary mixed heavy metal ion solution, and the concentration of each heavy metal ion in the binary mixed heavy metal ion solution was 2.5 mmol / L. The adsorption reaction was carried out in a water bath at 25°C. After the adsorption equilibrium, the concentration of each heavy metal ion in the mixed solution was measured, and the adsorption amount was calculated.
[0034] The experimental results show that: comparing the adsorption capacity of three kinds of binary mixed heavy metal solutions, Cu 2+ and Pb 2+ In the binary mixture, the modification of nylon membrane to Cu 2+ and Pb 2+ The adsorption capacity is 4.4826mmol / 100g and 4.6414mmol / 100g respectively; 2+ and Cd 2+ In the binary mixture, the modification of nylon membrane to Cu 2+ and Cd 2+ The adsorption capacity is 31.6891mmol / 100g and 1.4889mmol / 100g respectiv...
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