A kind of supported nano-iron alloy catalyst and method for advanced treatment of printing and dyeing wastewater
A ferroalloy and catalyst technology, which is applied in the field of loaded nano-iron alloy catalyst and advanced treatment of printing and dyeing wastewater, can solve the problems of nano-zero-valent iron easy to agglomerate, unstable performance, etc., achieve high catalytic activity, more reactivity, and improve reduction treatment capacity Effect
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[0038] The reaction formula for preparing nano-scale zero-valent metal described in the aforementioned second step is:
[0039] R n+ +2nBH 4 - +6nH 2 O→R+2nB(OH) 3 +7nH 2
[0040] The present invention uses the catalyst prepared by the above method for the treatment of printing and dyeing wastewater, and the specific method is as follows:
[0041] Take the printing and dyeing wastewater, adjust the pH to 5.0-7.0, add it to the beaker containing the nano-iron alloy catalyst prepared above (the catalyst quality is 60-100g / L, can be used many times), catalyze for 45-90min, add PAC, and add solid PAC Amount of 10-15ppm, stirring for three minutes, adding alkali to adjust the pH to 6.5-8.0, adding PAM, stirring flocculation, standing for precipitation, sampling analysis shows that the use of nano-iron alloy catalysts can treat refractory pollutants in printing and dyeing wastewater.
Embodiment 1
[0042] Embodiment 1: Preparation of nano-iron alloy catalyst
[0043] First step to buy 95% Al 2 o 3The ceramic sheet is used as the carrier and heated in an alcohol water bath with a volume concentration of 50% to degrease; add 40% roughening liquid HF solution with a volume of 40ml / L and 2g / L NH 4 F, Ultrasonic at room temperature, ultrasonic frequency is 40KHz, power is 150W, time is 40min, wash; put the roughened ceramic sheet into 10g / L SnCl 2 With 40ml / L HCl sensitization solution, ultrasonic at room temperature, rinse; put the sensitized ceramic piece into 0.25g / L PdCl 2 With 2.5mL / L HCl activation solution, sonicate at room temperature, rinse.
[0044] Step 2: At 25°C and N 2 Under the atmosphere, put the treated ceramic sheet into a container, add an appropriate amount of EDTA, platinum salt, nickel salt and iron salt solution (molar ratio is 10:1:1:18), and mix well, then quickly add an appropriate amount of Adjust NaBH at pH=14 with anaerobic alkaline solution ...
Embodiment 2
[0045] Embodiment 2: the comparison of nano-iron alloy and conventional iron-carbon micro-electrolysis
[0046] The first step, water quality before wastewater treatment:
[0047] Biochemical effluent of a sewage treatment plant
[0048] Mainly printing and dyeing wastewater, accounting for 90% of the total wastewater
[0049] pH: 7.41
[0050] COD: 302mg / L
[0051] Chroma: 200 times
[0052] The second step, the preparation of nano-iron alloy catalyst: to buy 95% Al 2 o 3 The ceramic sheet is used as the carrier and heated in an alcohol water bath with a volume concentration of 50% to degrease; add 40% roughening liquid HF solution with a volume of 40ml / L and 2g / L NH 4 F, Ultrasound at room temperature, rinse; put the roughened ceramic sheet into 10g / L SnCl 2 With 40ml / L HCl sensitization solution, ultrasonic at room temperature, rinse; put the sensitized ceramic piece into 0.25g / L PdCl 2 With 2.5mL / L HCl activation solution, ultrasonic at room temperature, rinse; at ...
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