Preparation method of polyglutamic acid modified nanoscale Fe/Pd nanoparticles and application in dechlorination of organic chlorides
A polyglutamic acid and nanoparticle technology, which is applied in the field of water pollution treatment, can solve the problems of inhibiting reaction activity, easily corroded by water, low dechlorination activity, etc., and achieves improved reaction rate constant, good colloidal stability, and good reduction. effect of effect
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[0023] Example 1
[0024] A method for preparing polyglutamic acid modified nano-scale Fe / Pd nanoparticles includes the following steps:
[0025] 1) Firstly weigh 10mg, 25mg, 50mg of polyglutamic acid (PGA), and dissolve them in 50mL water to prepare four polyglutamic acid solutions. Under the condition of argon gas flow, add to each prepared polyglutamic acid solution. Add 250mg of ferrous sulfate (the mass ratios of PGA to Fe are respectively 19.9:100, 49.7:100, 99.5:100) into the acid solution, and mix the polyglutamic acid and the iron salt for 5 minutes to obtain 3 solutions;
[0026] 2) To each solution obtained in step 1), quickly add 3 mL of a freshly prepared potassium borohydride solution with a concentration of 50 mg / mL (the molar ratio of potassium borohydride to soluble iron salt is 3:1) and stir quickly to react. Generate polyglutamic acid-modified nano-scale zero-valent iron particles, and continue to inject argon for 20 minutes to remove the hydrogen generated by the...
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[0032] Example 2
[0033] A method for preparing polyglutamic acid modified nano-scale Fe / Pd nanoparticles includes the following steps:
[0034] 1) Firstly weigh 10mg, 25mg, 50mg of polyglutamic acid (PGA), and dissolve them in 50mL water to prepare four polyglutamic acid solutions. Under the condition of argon gas flow, add to each prepared polyglutamic acid solution. Add 120mg of ferrous chloride (PGA / Fe mass ratios are 17:100, 48:100, 95:100, respectively) into the acid solution, and fully mix polyglutamic acid and iron salt for 5 minutes to obtain 3 solutions;
[0035] 2) Quickly add 1 mL of freshly prepared potassium borohydride solution (the molar ratio of potassium borohydride to soluble iron salt is 1:1) with a concentration of 50 mg / mL to the 3 solutions obtained in step 1) and stir quickly to react. Generate polyglutamic acid-modified nano-scale zero-valent iron particles, and continue to inject argon for 20 minutes to remove the hydrogen generated by the reaction and ens...
Example Embodiment
[0040] Example 3
[0041] A method for preparing polyglutamic acid modified nano-scale Fe / Pd nanoparticles includes the following steps:
[0042] 1) Firstly weigh 10mg, 25mg, 50mg of polyglutamic acid (PGA), and dissolve them in 50mL water to prepare four polyglutamic acid solutions. Under the condition of argon gas flow, add to each prepared polyglutamic acid solution. Add 150mg of ferric chloride (PGA / Fe mass ratios are 18:100, 47:100, 98:100, respectively) into the acid solution, and mix the polyglutamic acid and iron salt for 5 minutes to obtain 3 solutions;
[0043] 2) Quickly add 5 mL of freshly prepared potassium borohydride solution (the molar ratio of potassium borohydride to soluble iron salt is 5:1) with a concentration of 50 mg / mL to the 3 solutions obtained in step 1) and stir quickly to react. Generate polyglutamic acid modified nano-scale zero-valent iron particles, and continue to inject argon for 20 minutes to remove the hydrogen generated by the reaction and ensure...
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