Sludge-based magnetic nitrogen-doped biochar catalyst and preparation method thereof

A nitrogen-doped, biochar technology, used in physical/chemical process catalysts, chemical instruments and methods, water pollutants, etc., to achieve high-efficiency degradation, wide source of raw materials, and solution to purification problems.

Active Publication Date: 2019-09-13
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology uses concentrating slurry from different types of industries like urban sewerages, newspaper production, and industry garden sewers for use as primary feedstock while adding other chemical substances together to create more effective solutions against harmful contaminations found on surface waters (USE). These technologies have been developed at home and abroad but they still face challenges due to their large amounts of expensive and easy-available resources being treated separately without reuse. Additionally, these processes require specific equipment and procedures, making them less accessible when needed compared to traditional methods.

Problems solved by technology

This patented technical problem addressed in this patent relates to improving the efficiency of utilizing sludges containing valuable resources like nickel sulfides, zinc, selenium, chrome, vanadia, lead, cyanoferrite, pallbearth salts, chloroarsisilane, pyroselenocyanones, polysaccharin, polyhydroxypropylenetriazone, and various types of plasma generators. Existing techniques involve either direct decomposition or immersed acid leaching, followed by recovery of ammonions, resulting in contaminations during reprocessing.

Method used

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  • Sludge-based magnetic nitrogen-doped biochar catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 50mL of concentrated sludge from urban sewage treatment plants (water content 97.6%, organic matter content 50.4%, inorganic ash mainly composed of calcium, iron, aluminum, silicon, manganese and other elements, wherein the iron element content is 2%) and 0.06 g melamine and 0.06g straw (the weight ratio of dry sludge, melamine, and straw is 1:0.05:0.05), and placed in an ultrasonic cleaner to mix evenly, dried at 105°C, and ground to below 50 mesh, the mixture was placed Put it in a crucible, cover it, put it in a muffle furnace, bake it at 300°C for 6 hours, and then cool it down to room temperature naturally to get NBC-1.

[0018]Add 20mg of NBC-1 to methylene blue, methyl orange or rhodamine B wastewater containing 0.01-1mmol / L. After adsorption balance, add a certain amount of oxidant PMS to catalyze the degradation and mineralization of organic matter. The research results showed that the removal rate of the three dyes by NBC-1 was above 90%.

Embodiment 2

[0020] Add 50mL of concentrated sludge from paper mill sewage treatment plant in the crucible (moisture content 92.7%, organic matter content 40.8%, inorganic ash is mainly composed of elements such as calcium, iron, aluminum, silicon, manganese, wherein iron element content is 5%;) Mix with 1.825g urea and 1.825g sawdust (the weight ratio of dry sludge, urea, and sawdust is 1:0.5:0.5), and place in an ultrasonic cleaner to mix evenly, dry at 105°C, and grind to below 50 mesh. The mixture was placed in a crucible, covered and placed in a muffle furnace. It was calcined at 550°C for 3 hours and then cooled down to room temperature naturally to obtain NBC-2.

[0021] Add 2-40mg NBC-2 to 0.1mmol / L phenol or bisphenol A wastewater, after adsorption balance, add 0.05-2mmol / L oxidant PMS to catalyze degradation and mineralization of organic matter. The research results show that the removal rate of phenol and bisphenol A by NBC-2 increases with the increase of NBC-2 and PMS addition...

Embodiment 3

[0024] Add 50mL of concentrated sludge from industrial park sewage treatment plant (water content 97.1%, organic matter content 42.2%, inorganic ash is mainly composed of elements such as calcium, iron, aluminum, silicon, manganese, wherein iron element content is 7%) in the crucible 2.9g of guanidine hydrochloride and 2.9g of peanut shells (the weight ratio of dry sludge, guanidine hydrochloride, and peanut shells is 1:2:2), and placed in an ultrasonic cleaner, mixed evenly, dried at 105°C, and ground to 50 mesh Next, put the mixture in a crucible, cover it and place it in a muffle furnace, bake it at 700°C for 1 hour, and then cool it down to room temperature naturally to obtain NBC-3.

[0025] Add 20mg NBC-3 to the antibiotic wastewater containing 0.1mmol / L. After the adsorption balance, add 1mmol / L oxidant PMS to degrade and mineralize the organic matter. The research results showed that the removal rate of antibiotics by NBC-3 was above 50%.

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Abstract

The invention discloses a sludge-based magnetic nitrogen-doped biochar catalyst and a preparation method thereof, and belongs to the field of sludge resource utilization and the field of environmentalrestoration. The preparation method comprises the following steps: carrying out ultrasonic mixing of concentrated sludge and a certain amount of nitrogen-rich compounds and biomass wastes from urbansewage treatment plants, papermaking sewage treatment plants or industrial park sewage treatment plants, drying, ball-milling, placing the raw materials into a crucible, capping and sealing, and roasting at a high temperature in a muffle furnace to finally prepare the magnetic nitrogen-doped biochar catalyst which has high catalytic activity and high stability and is easy to separate and recycle.The catalyst can be coupled with an oxidizing agent peroxymonosulfate (PMS) to efficiently degrade and even mineralize refractory organic contaminants in a water body. The preparation method providedby the invention has advantages as follows: sources of the raw materials are wide; reaction condition is mild; preparation cost is low; and the preparation method is green and environmentally-friendly. Sludge and biomass wastes from sewage treatment plants that are hard to treat are recycled, and the pollution problem of refractory organic matter in a water body is also solved. The catalyst of theinvention has a broad application prospect in the field of sludge resource utilization and the field of environmental restoration.

Description

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Claims

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Application Information

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Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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