A kind of processing method of electroplating waste liquid containing heavy metal ions
A technology of heavy metal ions and electroplating waste liquid, which is applied in metallurgical wastewater treatment, alkali metal compounds, water/sewage treatment, etc. It can solve the problems of insufficient adsorption capacity, environmental hazards, large consumption, etc., and achieve fast adsorption rate and process energy consumption The effect of low and large suction capacity
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Embodiment 1
[0024] A method for treating waste electroplating solution containing heavy metal ions, comprising the following steps:
[0025] (1) Preparation of magnetic adsorbent:
[0026] (a) Dissolve 1mol of 1,4,7-triazacyclononane-1,4,7-triacetic acid in 45ml of biological buffer solution with a pH of 5.3-5.5, and add 10mol of EDC·HCl and 5mol NHS was used as a catalyst, and stirred at room temperature for 1 h to obtain an activated intermediate of the azamacrocyclic carboxylic acid derivative;
[0027] (b) Add 0.45g Fe to the activated intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains particles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8 hours. After the reaction, use a magnet to separate the product, and wash the product alternately with 0.1mol / L HCl solution, ethanol and water Several times, vacuum dr...
Embodiment 2
[0031] (1) Preparation of magnetic adsorbent:
[0032] (a) Dissolve 1mol of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid in 55ml of biological buffer solution with a pH of 5.3-5.5, under nitrogen protection, add 40mol EDC·HCl and 15mol NHS were used as catalysts, stirred at room temperature for 2 hours to obtain activated intermediates of azamacrocyclic carboxylic acid derivatives;
[0033] (b) Add 0.55g Fe to the activated intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains particles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 10 hours. After the reaction, use a magnet to separate the product, and wash the product alternately with 0.1mol / L HCl solution, ethanol and water Several times, vacuum drying for 15 hours to obtain a magnetic adsorbent;
[0034] (2) The electroplating waste liqui...
Embodiment 3
[0037] (1) Preparation of magnetic adsorbent:
[0038] (a) Dissolve 1mol of 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetraacetic acid in 50ml of biological buffer solution with a pH of 5.3-5.5, under nitrogen protection, add 20mol EDC·HCl and 7mol NHS were used as catalysts, stirred at room temperature for 1.2h to obtain activated intermediates of azamacrocyclic carboxylic acid derivatives;
[0039] (b) Add 0.48g Fe to the activated intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains particles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8.5 hours. After the reaction, use a magnet to separate the product and wash it alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 13 hours to obtain a magnetic adsorbent;
[0040] (2) The electroplating wast...
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