Bifunctional porous material efficient in adsorptively degrading lignin and preparation method thereof

A technology of adsorption and degradation, porous materials, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of limited adsorption capacity, negative impact of degradation, insufficient capacity, etc., to achieve good economic benefits and high efficiency Effect of degradation and strong adsorption capacity

Inactive Publication Date: 2016-12-07
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, the treatment object is also wastewater containing small molecule dyes, if it is used to treat large molecular weight lignin, it will be difficult to succeed
The reasons are as follows: First, it is difficult for the catalyst to selectively adsorb lignin. The specific surface area of ​​bismuth ferrite and carbon nanotubes is relatively low, and the adsorption capacity is relatively limited. The lack of adsorption capacity will inevitably have a negative impact on subsequent degradation.
The second is that the catalytic activity of the catalyst needs to be improved, especially for large molecules such as lignin that are difficult to degrade, and its ability is still insufficient.

Method used

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  • Bifunctional porous material efficient in adsorptively degrading lignin and preparation method thereof
  • Bifunctional porous material efficient in adsorptively degrading lignin and preparation method thereof
  • Bifunctional porous material efficient in adsorptively degrading lignin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Preparation of meso-BiFeO by liquid phase deposition method 3 / g -C 3 N 4 composite material

[0042] (1) meso-BiFeO 3 preparation of

[0043] Refer to literature (F. Kleitz, S.H. Choi, R. Ryoo, Chemical Communications 2003:2136–2137) to prepare large mesoporous cubic Ia3d Symmetrical silica (KIT-6) is the hard template. With Bi(NO 3 ) 3 and Fe(NO 3 ) 3 As raw material, meso-BiFeO was prepared by nanocasting method 3 catalyst. The details are as follows: First, a certain amount of Fe(NO 3 ) 3 , Bi(NO 3 ) 3 and KIT-6 were ground in a mortar and then dispersed in a volume of hexane to form a homogeneous mixture. Next, the above mixture was dispersed into a certain amount of hexane, refluxed and stirred at 70 °C for 12 h, then cooled, filtered, and then dried at 70 °C to obtain a solid product. The product was then heated to 600°C in an air-atmosphere tube furnace and held for 5 h. Finally, the solid was put into 2 M NaOH solution, vigorously s...

Embodiment 2

[0052] Example 2: Preparation of porous BiFeO by hydrothermal method 3 / g -C 3 N 4 composite material

[0053] (1) g-C 3 N 4 Preparation of nanosheets

[0054] First put dicyandiamide into a muffle furnace, heat to 550°C, and keep it warm for 4 hours to obtain g-C 3 N 4 . Then, g-C 3 N 4 Mixed with concentrated sulfuric acid and stirred for 8 h, then poured into deionized water for ultrasonic treatment. After the mixture turned bright yellow, it was centrifuged to remove unstripped g-C 3 N 4 . Subsequently, the centrifuged suspension was washed with deionized water, and the above mixture was dried at 80°C to obtain the product.

[0055] (2) Porous meso-BiFeO 3 / g -C 3 N 4 Preparation of composite materials

[0056] ①Clean the 200mL beaker, 100mL measuring cylinder, glass rod, funnel, Buchner funnel, and 50mL volumetric flask used in the experiment, and dry them to prepare for the experiment;

[0057] ②Weigh 0.67g of Fe(NO 3 ) 3 9H 2 O with 0.808g Bi(NO 3 ...

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Abstract

A dual-functional porous material with high-efficiency adsorption and degradation of lignin and its preparation method are characterized in that: it is composed of bismuth ferrite-carbon nitride nanosheets, bismuth ferrite has a highly ordered mesoporous structure, and mesoporous ferrite Bismuth meso‑BiFeO 3 with carbon nitride nanosheets g‑C 3 N 4 The molar ratio of NS is 1~11:1. The composite catalyst with mesoporous nano-bismuth ferrite as the main catalyst and the ultra-thin carbon nitride nanosheet support as the surface adsorption modification layer enhances the two The affinity of lignin can significantly strengthen the adsorption of lignin and improve the interface reaction ability; through the semiconductor coupling between bismuth ferrite and carbon nitride, the separation and transfer of photogenerated carriers at the heterogeneous interface can be promoted, and the recombination can be improved. visible light catalytic activity of the catalyst; finally, under visible light and H 2 o 2 In the composed reaction system, strong oxidizing species such as hydroxyl radicals catalyzed by the catalyst attack lignin molecules, leading to the opening of its structure and realizing its efficient degradation, which has very important scientific significance and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to the use of a composite of mesoporous bismuth ferrite and carbon nitride nanosheets as an adsorption and catalyst during the treatment of lignin-containing papermaking wastewater, using the strong strength of the composite porous material Adsorption and catalytic performance of lignin, adsorption and catalytic oxidative degradation of lignin, and finally achieve the purpose of lignin removal, to achieve advanced treatment of lignin-containing wastewater. Background technique [0002] my country is a country that lacks water resources, and the pollution of water resources is relatively serious, which makes water resources face a more severe situation. Among industrial enterprises, the paper industry is a large sewage discharger, which has a great impact on the water environment. Therefore, it is an urgent task to carry out advanced treatment of the wastewater discharged by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/30C02F1/72C02F1/28B01J27/24B01J35/10
CPCB01J20/0259B01J23/8437B01J27/24B01J35/10B01J2220/42B01J2220/4806C02F1/281C02F1/30C02F1/722C02F1/725C02F2101/34C02F2103/28C02F2305/026C02F2305/10
Inventor 安俊健王鹏张光彦
Owner HUBEI UNIV OF TECH
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