Method for synchronously removing and stepwise recovering sulfoacid dye and heavy metal ion through resin
A heavy metal ion, heavy metal technology, applied in chemical instruments and methods, ion exchange water/sewage treatment, water pollutants, etc., can solve the problems of high cost, complicated procedures, inability to recycle valuable resources, etc. Low material cost and no secondary pollution
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Embodiment 1
[0028] A method utilizing resin to simultaneously remove and recover sulfonic acid dyes and heavy metal ions step by step, the steps are:
[0029] (1) Simultaneous adsorption: put 10 mL of adsorption resin (NDA-150) into a jacketed glass adsorption column (Φ32×360 mm), keep the column temperature at 30°C, add sulfonic acid dye (acid black 1, CAS : 1064-48-8) and copper salt (the initial concentration of the dye is 1000 mg / L, the initial concentration of copper ions is 30 mg / L) to adjust the pH to 5, and the flow rate is 5 BV / h. adsorption column. The processing capacity is 50 BV / batch. The average concentration of dye in the adsorbed water was 190 mg / L, and the average concentration of copper ions was 9.5 mg / L.
[0030] (2) Recovery of heavy metals: keep the column temperature at 30°C, use 15 BV of hydrochloric acid solution (concentration of 4% by mass percentage, the concentration of hydrochloric acid, sulfuric acid and sodium hydroxide in the following examples refers to ...
Embodiment 2
[0033] Same as Example 1, the difference is that NDA-99 is used to replace the adsorption resin NDA-150 in Example 1, and in step (2), 18 BV15% hydrochloric acid solution is used to carry out the first adsorption to the adsorbed resin at 6 BV / h. The column temperature in step (3) was 30°C. Under the same adsorption and desorption operating conditions, the average concentration of dye in the adsorbed water was 220 mg / L, and the average concentration of copper ions was 8.2 mg / L. In the first round of desorption, the copper ion desorption rate reached 100%, and the dye was not detected; in the second round of desorption, the dye desorption rate reached 98%.
Embodiment 3
[0035] Same as Example 1, the difference is that the adsorption resin NDA-150 in Example 1 is replaced by XAD-4 produced by U.S. Rohm & Haas Company. Under the same adsorption and desorption operating conditions, the average concentration of the adsorbed water dye is 310 mg / L, the average concentration of copper ions is about 18 mg / L. In the first round of desorption, the copper ion desorption rate reached 100%, and the dye was not detected; in the second round of desorption, the dye desorption rate reached 100%.
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