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Heterogeneous Fenton catalyst, and preparation method and application thereof

A catalyst and heterogeneous technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of large dosage of slag and hydrogen peroxide, large fluctuation of treatment efficiency, long reaction time, etc. problems, to achieve the effect of fast treatment of organic sewage, wide application range and simple operation

Inactive Publication Date: 2019-09-13
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the use of pyrite slag in the Fenton-like method has a significant effect in the advanced treatment of vitamin C wastewater. In the experiment, it is necessary to add ferrous sulfate equivalent to hydrogen peroxide, and the reaction will form Fe(OH) 3 And polyacrylamide is required for coagulation. Pyrite catalyzes hydrogen peroxide under acidic conditions to treat cationic red X-GRL wastewater and triclosan. The effect is mainly played by the iron ion composition of the mineral dissolved under acidic conditions
CN103708647B discloses a method for advanced oxidation advanced treatment of industrial wastewater, by adding nitrilotriacetic acid as a promoter and adding ferric chloride as a secondary oxidant, the reaction time of this method is longer, and finally polyacrylamide needs to be added for coagulation
CN102963943B discloses a technology for treating nitrobenzene waste water with pyrite, using pyrite fixed bed, reacting on the surface of pyrite to reduce nitrobenzene to aniline, the reaction time is long and the operation is complicated
CN101745197B discloses a method for advanced oxidation removal of pollutants, which utilizes pyrite slag to catalyze H 2 o 2 It is a technical means to degrade organic pollutants by generating hydroxyl radicals and the synergistic effect between various metals, but this technology requires a large amount of slag and hydrogen peroxide.

Method used

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  • Heterogeneous Fenton catalyst, and preparation method and application thereof
  • Heterogeneous Fenton catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of heterogeneous Fenton catalyst 1:

[0025] The heterogeneous Fenton catalyst 1 was obtained by mixing sodium thiosulfate and 60-80 mesh sulfur iron slag according to the mass ratio of 1:3.3, grinding them evenly, and then heating at 160°C for 8 hours.

[0026] At a reaction temperature of 25°C, mix the heterogeneous Fenton catalyst 1, hydrogen peroxide, hydroxylamine hydrochloride, and printing and dyeing wastewater containing methylene blue at a pH of 2. After mixing, the content of the heterogeneous Fenton catalyst 1 in the reaction system is 1 g / L, the concentration of hydrogen peroxide is 29mmol / L, the concentration of hydroxylamine hydrochloride is 0.2mmol / L, and the concentration of methylene blue is 50mg / L. The mixture is monitored in real time, and the monitoring results are shown in Table 1:

[0027] Table 1

[0028] Reaction time 3min 5min 8min 10min Methylene blue concentration (mg / L) 18.17 8.23 1.44 0 ...

Embodiment 2

[0030] The preparation method of heterogeneous Fenton catalyst 2:

[0031] The heterogeneous Fenton catalyst 2 was obtained by mixing thiourea and 100-140 mesh sulfur iron slag according to the mass ratio of 1:5 and grinding them evenly, and then heating at 140°C for 5 hours.

[0032] At a reaction temperature of 30°C, mix the heterogeneous Fenton catalyst 2, hydrogen peroxide, hydroxylamine sulfate, and printing and dyeing wastewater containing Rhodamine B at a pH of 10. After mixing, the content of the heterogeneous Fenton catalyst 2 in the reaction system 0.5g / L, the concentration of hydrogen peroxide is 5.8mmol / L, the concentration of hydroxylamine sulfate is 1mmol / L, and the concentration of rhodamine B is 20mg / L. The mixture is monitored in real time, and the monitoring results are shown in Table 2:

[0033] Table 2

[0034] Reaction time 10min 30min 50min 70min Rhodamine B concentration (mg / L) 16.51 10.22 6.56 2.10 Rhodamine B decoloriza...

Embodiment 3

[0036] The preparation method of heterogeneous Fenton catalyst 3:

[0037] The heterogeneous Fenton catalyst 3 was prepared by mixing thioacetamide and 260-300 mesh sulfur iron slag according to a mass ratio of 1:1, grinding them evenly, and then heating at 200°C for 10 hours.

[0038] At a reaction temperature of 25°C, mix the heterogeneous Fenton catalyst 3, hydrogen peroxide, ascorbic acid and glucose-containing papermaking wastewater evenly. After mixing, the content of the heterogeneous Fenton catalyst 3 is 3 g / L, and the concentration of hydrogen peroxide is 98mmol / L, the concentration of ascorbic acid is 2mmol / L, the COD of glucose Cr It is 920mg / L. The mixture is monitored in real time, and the monitoring results are shown in Table 3:

[0039] table 3

[0040] Reaction time 20min 30min 40min 50min 60min COD Cr (mg / L)

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Abstract

The invention specifically discloses a heterogeneous Fenton catalyst, and a preparation method and application thereof, belonging to the field of sewage treatment. The preparation method comprises thefollowing steps: uniformly mixing a sulfur-containing compound with sieved pyrite cinder, then carrying out grinding, and performing heating at 100-200 DEG C for 5-20 h so as to prepare the heterogeneous Fenton catalyst. The heterogeneous Fenton catalyst utilizes a sulfide for modification of the pyrite cinder to increase the content of Fe<2+> on the surfaces of cinder particles, thereby improving the catalytic activity of the heterogeneous Fenton catalyst. When the heterogeneous Fenton catalyst is applied to the treatment of organic wastewater, hydrogen peroxide rapidly reacts with the Fe<2+> in the heterogeneous Fenton catalyst to produce Fe<3+> and .OH; and the addition of a reduction accelerant can effectively improve the efficiency of conversion of Fe<3+> in the cinder catalyst intoFe<2+>, so the heterogeneous Fenton catalyst produces little iron sludge, treats organic wastewater quickly and can be widely applied to the treatment of various organic wastewater.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and more specifically relates to a heterogeneous Fenton catalyst and its preparation method and application. Background technique [0002] The traditional homogeneous Fenton reaction utilizes ferrous sulfate and H 2 o 2 As Fenton's reagent, ferrous ions can react with hydrogen peroxide rapidly to form Fe in the reaction. 3+ and OH, but in the chain transfer reaction Fe 3+ is reduced to Fe 2+ The rate is very slow, and the homogeneous Fe 2+ / H 2 o 2 The system can only show a good degradation effect at a low pH value (2-4), and the Fe produced in the reaction 3+ It is easily hydrolyzed and flocculated into iron sludge in the solution, and the treatment cost is high, which affects the recycling of iron, and at the same time leads to Fe in the homogeneous Fenton reaction. 3+ / Fe 2+ The cycle efficiency and H 2 o 2 The utilization ratios are low, which has become a bottleneck limiting the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J37/08B01J37/16B01J37/20C02F1/72C02F103/28C02F103/34C02F101/30C02F101/36C02F101/34C02F101/38
CPCB01J27/043B01J37/16B01J37/0036B01J37/08B01J37/20C02F1/722C02F1/725C02F2305/026C02F2101/308C02F2103/28C02F2103/343C02F2101/34C02F2101/40C02F2101/36C02F2101/38
Inventor 秦振华王艳黄晓漫李建芬申文娟喻玖宏
Owner WUHAN POLYTECHNIC UNIVERSITY
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