Method for rapid reduction removal of nitrate nitrogen and nitrite nitrogen in water body through activated cathode new hydrogen
A technology of nitrite nitrogen and nitrate nitrogen, which is applied in the field of nitrate and nitrite treatment for environmental protection, can solve the problems of high water body composition requirements, achieve catalyst recyclability, low water body composition requirements, and avoid secondary pollution Effect
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Embodiment 1
[0055] A method for quickly reducing and removing nitrate nitrogen and nitrite nitrogen in water by activating the new hydrogen at the cathode, comprising the following steps:
[0056] Step 1: Measure the pre-configured 3mM NO 3 - or NO 2 - 90ml of the solution was added to the cathode chamber, and the same amount of deionized water was taken in the anode chamber, and electrolyte was added to make the electrolyte concentration of the cathode and anode chambers both 20mM. The anode chamber is inserted with a ruthenium-iridium electrode, the cathode chamber is inserted with a pure titanium plate, and a DC stabilized voltage power supply is connected to the electrode.
[0057] Step 2: Under magnetic stirring, add Raney nickel catalyst to the cathode chamber, the amount of catalyst is 1g / L, at the same time, quickly start the power supply, press the stopwatch to time, and the reaction time is 0min, 5min, 10min, 20min, 30min, 45min, respectively. At 60 minutes and 90 minutes, a...
Embodiment 2
[0061] A method for quickly reducing and removing nitrate nitrogen and nitrite nitrogen in water by activating the new hydrogen at the cathode, comprising the following steps:
[0062] The difference from Example 1 is: the constant current mode is adopted in step 2, the current is 0.12A, and the amount of Raney nickel added each time is 0g / L, 0.2g / L, 0.5g / L, 1g / L, 1.5g / L, thus obtaining the ratio of Raney nickel addition to NO 3 - and NO 2 - The effect of the reduction rate, the rest of the conditions were kept constant. The result is as figure 2 shown. figure 2 It shows that the hydrogen precipitated from the pure titanium plate itself has a certain catalytic effect. Under the condition of no catalyst added, there are 17.45% and 20.10% NO in one hour respectively. 3 - and NO 2 - was reduced, with the increase of Raney nickel addition, the catalytic activity increased significantly.
Embodiment 3
[0064] A method for quickly reducing and removing nitrate nitrogen and nitrite nitrogen in water by activating the new hydrogen at the cathode, comprising the following steps:
[0065] The difference from Example 2 is that step 1 adjusts NO 3 - and NO 2 - The initial concentration is 1mM, 2mM, 3mM, 4mM, 5mM, the fixed current in step 2 is 0.12A, and the amount of catalyst added is 1g / L. Catalyze the reaction for one hour, and use ion chromatography to detect NO in the solution after the reaction 3 - and NO 2 - concentration. The result is as image 3 shown. image 3 show that with NO 3 - and NO 2 - The initial concentration increases, C t / C 0 showing a downward trend.
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