Unlock instant, AI-driven research and patent intelligence for your innovation.

use co 2 Method for activating biochar and activating persulfate to degrade phenols in water

A technology for activating persulfate and persulfate, applied in the field of water treatment, can solve the problems of difficult to completely solve the dissolution of toxic metal ions, reduce economic efficiency, limit large-scale use, etc., achieves cheap and easy-to-obtain catalyst raw materials, and improves specific surface area. , the effect of improving the electronic transmission capacity

Active Publication Date: 2021-04-02
ZHEJIANG UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activation with external energy greatly reduces the economy and limits the large-scale use; transition metal-based catalysts are difficult to completely solve the problem of dissolution of toxic metal ions
In order to overcome the above problems, metal-free carbon-based catalysts have received extensive attention in recent years, mainly nanocarbon materials such as graphene oxide, carbon nanotubes, carbon nanodrills, and ordered mesoporous carbon. However, for low-cost biomass-based There are few reports on porous carbon materials that efficiently catalyze the degradation of organic pollutants by persulfate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • use co <sub>2</sub> Method for activating biochar and activating persulfate to degrade phenols in water
  • use co <sub>2</sub> Method for activating biochar and activating persulfate to degrade phenols in water
  • use co <sub>2</sub> Method for activating biochar and activating persulfate to degrade phenols in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 20g of microcrystalline cellulose and place in N 2 Carbonization treatment at 500°C for 3h under atmosphere, controlled heating rate of 10°C / min, to obtain original unactivated biochar BC500. 1 g of biochar was placed in a tube furnace, N 2 The temperature was raised to 950°C under the atmosphere, and CO was introduced instead. 2 Activation for 1h, passing CO 2 The flow control of the gas is 500mL / min (the same as in the following examples). then in N 2 Cool to room temperature under atmosphere to obtain carbon dioxide activated biochar AC950.

[0030] The AC950 of 0.2g / L and the sodium persulfate (PS) of 5mM (concentration here refers to the final concentration of catalyst and persulfate in the reaction system, the following examples are the same) placed in 0.5mM phenol with a pH value of 7 In the aqueous solution of simulated pollutants, under the shaking condition of 200r / min, the degradation efficiency reaches more than 99% within 60min at normal pressure...

Embodiment 2

[0032] Weigh 20g of microcrystalline cellulose and place in N 2 The original biochar BC500 was obtained by carbonizing at 500°C for 3 hours under the atmosphere and controlling the heating rate at 10°C / min. 1 g of biochar was placed in a tube furnace, N 2 The temperature was raised to 900°C under the atmosphere, and CO was introduced instead. 2 Activation for 1h, then in N 2 Cool to room temperature under atmosphere to obtain carbon dioxide activated biochar AC900.

[0033] Put 0.2g / L AC900 and 5mM sodium persulfate (PS) in the aqueous solution of 0.5mM phenol simulated pollutant with a pH value of 7, under the shaking condition of 200r / min, under normal pressure and 25℃ for 60min The internal degradation efficiency reaches more than 85%.

Embodiment 3

[0035] Weigh 20g of microcrystalline cellulose and place in N 2 The original biochar BC500 was obtained by carbonizing at 500°C for 3 hours under the atmosphere and controlling the heating rate at 10°C / min. 1 g of biochar was placed in a tube furnace, N 2 The temperature was raised to 850°C under the atmosphere, and CO was introduced instead. 2 Activation for 1h, then in N 2 Cool to room temperature under atmosphere to obtain carbon dioxide activated biochar AC850.

[0036] Put 0.2g / L AC850 and 5mM sodium persulfate (PS) in the aqueous solution of 0.5mM phenol simulated pollutant with a pH value of 7, under the shaking condition of 200r / min, under normal pressure and 25℃ for 60min The internal degradation efficiency reaches more than 51%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a water treatment technology, and aims to provide a method for degrading and removing phenols in water by CO2 activated biochar activated persulfate. The catalyst is preparedby the following ways: placing microcrystalline cellulose in a tubular furnace, heating and carbonizing in an N2 atmosphere to obtain unactivated biochar; continuing to heat to 800-950 DEG C in the N2atmosphere, then changing to introduce CO2 gas, activating for 1 h, and cooling to room temperature in the N2 atmosphere to obtain the CO2 activated biochar catalyst. Through high temperature activation, the oxygen content on the surface of the carbon material is greatly reduced, and the reducibility of the carbon material is improved. At the same time, the high temperature treatment makes the carbon material begin to graphitize, and the electronic transmission capacity of the material is greatly improved. As an electronic transmission medium, the material promotes the electronic transmissionand degradation process of phenol pollutants and persulfate. The method has the advantages of catalyst raw material cheap and easy to obtain, simple preparation, fast reaction rate, no secondary pollution such as metal leaching and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a 2 A method for activating biochar to degrade phenols in water by activating persulfate degradation. Background technique [0002] Phenolic compounds are common organic pollutants in water bodies. There are hundreds of species in total. They come from a wide range of sources. Industrial discharges such as coking, papermaking, medicine, printing and dyeing, and chemical industry, pesticide degradation, and the biogeochemical cycle of the environment itself may be affected. produce. [0003] The advanced oxidation method based on persulfate is an emerging Fenton-like advanced oxidation method in recent years. Compared with hydrogen peroxide, persulfate is solid at room temperature, easy to store and transport; the cost is lower ($0.74 / kg vs $1.5 / kg); the oxidation potential of persulfate radical is higher than that of hydroxyl radical·OH (3.1V vs2.8V); the activation me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/72C02F101/34
CPCC02F1/281C02F1/722C02F1/725C02F2101/345
Inventor 陈彤黄群星孙晨李晓东严建华
Owner ZHEJIANG UNIV