Sludge-based biochar-manganese slag composite catalyst as well as preparation method and application thereof
A composite catalyst and bio-carbon technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, water pollutants, etc., can solve the problems of cumbersome preparation process, easy desorption, interference ions, etc., to achieve simple preparation process, Rapid oxidative degradation and controllable reaction conditions
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Embodiment 1
[0042] Preparation of sludge-based biocarbon-manganese slag composite catalyst: The sludge (taken from the fresh wet sludge of Changsha Changshanyuan Sewage Treatment Plant) and electrolytic manganese slag (taken from Xiangtan Electrochemical Technology Co., Ltd.) were washed with water for 1 After drying for 4 hours at 50°C, pass the dried sludge and manganese slag through a 150-mesh sieve, and collect the particles under the sieve. Weigh 4g of sludge and 1.5g of manganese slag respectively and place them in 100mL of 0.5M potassium carbonate solution. After reacting for 30min, add nitric acid to make the concentration in the reaction system 0.4M. After continuing to react for 10min, use 0.45μm water The filter membrane was suction filtered, the filter residue was washed with ethanol and deionized water, and then dried. The obtained precursors were respectively pyrolyzed at 600, 700, and 800°C for 2 hours under a nitrogen protection atmosphere, and the composite materials obtai...
Embodiment 2
[0045] The composite catalyst-800 prepared in Example 1 is selected as the catalyst, and the composite catalyst-800 of 50mg is added to 100mL respectively containing 20mg / L of norfloxacin, bisphenol A, roxarsone simulated antibiotic waste water, 100mg In the simulated dye wastewater of malachite green and acid orange, and the simulated mineral processing wastewater of 50mg / L No. 2 oil and butylamine black drug, after an adsorption time of 60min, add 2mL of persulfuric acid with a concentration of 10g / L Potassium, after continuing to react for 60min, it was measured that the catalytic system was sensitive to norfloxacin (pH=8.04), bisphenol A (pH=7.65), roxarsone (pH=4.51), malachite green (pH=2.87), acid The degradation rates of orange (pH=2.56) were 82.4%, 90.2%, 93.2%, 94.6%, and 95.3%, respectively. For the simulated ore dressing containing No. 2 oil (pH=5.38) and butylamine black drug (pH=7.15) The COD removal rates of wastewater were 74.4% and 79.8%, see Figure 5 .
Embodiment 3
[0047] Preparation of sludge-based biochar-manganese slag composite catalyst: After the sludge and electrolytic manganese slag were washed with water once, dried at 50°C for 5 hours, the dried sludge and manganese slag were passed through a 200-mesh sieve, and collected The particles were sieved to prepare different composite catalysts respectively. Catalyst 1: Weigh 4g of sludge and 1.2g of manganese slag and place them in 100mL of 0.45M potassium carbonate solution. After reacting for 35min, filter with 0.45μm water filter membrane, wash the filter residue with ethanol and deionized water, and then bake Dry to obtain precursor 1; Catalyst 2: Weigh 4g of sludge and 1.2g of manganese slag and place them in 100mL of nitric acid solution with a concentration of 0.4M. Wash with deionized water and dry to obtain the precursor 2; Catalyst 3: Weigh 4g of sludge and 1.2g of manganese slag and place them in 100mL of 0.45M potassium carbonate solution. After reacting for 35min, add nit...
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