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Composite magnetic flocculating agent with auto-catalytic degradation function and method for preparing composite magnetic flocculating agent

A composite magnetic and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, energy wastewater treatment, etc., can solve problems such as increased treatment costs, environmental threats, waste of resources, etc.

Inactive Publication Date: 2016-12-14
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercial PAM flocculants also have some obvious shortcomings: (1) The main component of commercial PAM flocculants is ultra-high molecular weight PAM, which is used in large quantities and relatively high in cost
(2) A large number of PAM polymer chains remain in the flocculation sedimentation, which makes the moisture remaining in the sediment volatilize and dry very slowly, which not only increases the treatment cost, but also poses a potential hazard to the water quality and environment around the sedimentation
(3) Under the irradiation of sunlight, some PAM polymer chains are naturally degraded into toxic acrylamide monomers, and long-term outdoor placement poses a greater threat to the environment
However, suspended TiO 2 There is a problem of difficult recycling, such as direct discharge, which not only wastes resources, but also pollutes the environment again

Method used

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  • Composite magnetic flocculating agent with auto-catalytic degradation function and method for preparing composite magnetic flocculating agent
  • Composite magnetic flocculating agent with auto-catalytic degradation function and method for preparing composite magnetic flocculating agent
  • Composite magnetic flocculating agent with auto-catalytic degradation function and method for preparing composite magnetic flocculating agent

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Experimental program
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Effect test

Embodiment 1

[0053] A composite magnetic flocculant with self-catalytic degradation function, which is a composite magnetic flocculant with inorganic magnetic composite particles as the core and polyacrylamide bonded on the surface of the inorganic magnetic composite particles; It is composed of three irons, a middle layer of silicon dioxide coating layer and an outer layer of titanium dioxide coating layer.

[0054] A preparation method of a composite magnetic flocculant with self-catalytic degradation function, comprising the following steps:

[0055] S1, Magnetic Fe 3 o 4 Preparation: Under nitrogen atmosphere, take ferrous iron and ferric iron and add ammonia water to prepare magnetic Fe by co-precipitation method. 3 o 4 ;

[0056] S2, SiO 2 Coated Fe 3 o 4 Preparation of magnetic composite particles: Under alkaline conditions, the magnetic Fe prepared in S1 3 o 4 Ethyl orthosilicate is added to prepare SiO 2 Coated Fe 3 o 4 Magnetic composite particles; it can avoid the ox...

Embodiment 2

[0060] A composite magnetic flocculant with self-catalytic degradation function, which is a composite magnetic flocculant with inorganic magnetic composite particles as the core and polyacrylamide bonded on the surface of the inorganic magnetic composite particles; It is composed of three irons, a middle layer of silicon dioxide coating layer and an outer layer of titanium dioxide coating layer.

[0061] A preparation method of a composite magnetic flocculant with self-catalytic degradation function, comprising the following steps:

[0062] S1, Magnetic Fe 3 o 4 The preparation comprises the following steps:

[0063] S1.1. Weigh FeCl according to the molar ratio of 0.01:0.005 3 ·6H 2 O and FeCl 2 4H 2 O was dissolved in deionized water, fed with nitrogen, heated at 25°C, and titrated with ammonia water with a mass fraction of 25%. Among them, according to the mass-volume ratio, FeCl 3 ·6H 2 O: deionized water = 0.01g: 400mL;

[0064] S1.2. When ammonia water is titrat...

Embodiment 3

[0077] A composite magnetic flocculant with self-catalytic degradation function, which is a composite magnetic flocculant with inorganic magnetic composite particles as the core and polyacrylamide bonded on the surface of the inorganic magnetic composite particles; It is composed of three irons, a middle layer of silicon dioxide coating layer and an outer layer of titanium dioxide coating layer.

[0078] A preparation method of a composite magnetic flocculant with self-catalytic degradation function, comprising the following steps:

[0079] S1, Magnetic Fe 3 o 4 The preparation comprises the following steps:

[0080] S1.1. Weigh FeCl according to the molar ratio 0.02︰0.02 3 ·6H 2 O and FeCl 2 4H 2 O was dissolved in deionized water, fed with nitrogen, heated at 35°C, and titrated with ammonia water with a mass fraction of 25%. Among them, according to the mass-volume ratio, FeCl 3 ·6H 2 O: deionized water = 0.02g: 200mL;

[0081] S1.2. When ammonia water is titrated u...

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Abstract

The invention discloses a composite magnetic flocculating agent with an auto-catalytic degradation function. Inorganic magnetic composite micro-particles are used as cores, and polyacrylamide is bonded on the surfaces of the inorganic magnetic composite micro-particles to obtain the composite magnetic flocculating agent; the inorganic magnetic composite micro-particles comprise inner-layer magnetic ferriferous oxide, intermediate silicon dioxide coating layers and outer titanium dioxide coating layers. The invention further discloses a method for preparing the composite magnetic flocculating agent. The composite magnetic flocculating agent with the auto-catalytic degradation function and the method have the advantages that the contact efficiency of photocatalysts can be effectively improved, the flocculating performance of the composite magnetic flocculating agent can be enhanced, the composite magnetic flocculating agent is low in usage, sewage can be treated by the composite magnetic flocculating agent within short time, obvious sewage treatment effects can be realized, and the sewage treatment efficiency can be effectively enhanced; internal catalytic photo-degradation can be carried out on uniformly distributed titanium dioxide under the effect of ultraviolet light, breakage and degradation of macromolecular chains of the polyacrylamide can be accelerated, and secondary pollution due to natural degradation of the polyacrylamide can be effectively reduced; the method is implemented under mild conditions and is easy to control and implement.

Description

technical field [0001] The invention relates to a composite magnetic flocculant with self-catalytic degradation function and a preparation method thereof, specifically belonging to the technical field of flocculants. Background technique [0002] Water plays a vital role in the life and development of human society. In 2015, the Ministry of Water Resources organized monitoring of 2,103 groundwater wells in various regions of the country, and found that the combined water quality of IV and V accounted for 80.2%. It means that more than 80% of groundwater is threatened by pollution. The huge development of heavy industry has made the problem of industrial sewage treatment more and more important. No matter at home or abroad, high-quality flocculants have broad market prospects. However, the current industrial layout in my country is irrational and the industrial foundation is weak. It will also expand the market demand for industrial sewage treatment products. The use of floc...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F1/52
CPCC02F1/5236C02F1/56Y02W10/37
Inventor 林慧凤王海旺张钺全源王柄筑孙中祥刘福臣何发亮王欣王昭宇杨雯曾平萱
Owner 东北大学秦皇岛分校
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