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Supergravity preparation method for chitosan-supported nanoscale zero-valent iron and bimetal composite material thereof

A technology of nano-zero-valent iron and composite materials, applied in the field of nano-materials, can solve the problems of large process amplification effect, uneven particle size distribution, and poor reproducibility of batch production, and achieve low preparation cost, simple preparation method, and microscopic mixing and the effect of mass transfer process enhancement

Inactive Publication Date: 2018-07-10
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the borohydride reduction of iron or other metal ions to generate zero-valent metal elements is a fast reaction precipitation process, the characteristic time of its nucleation is about 1ms, so the transfer and mixing at the molecular scale in the traditional stirred reactor The rate is much lower than the nucleation rate of liquid-phase reduction precipitation, resulting in an inhomogeneous environment for the nucleation and growth process on the molecular scale, so the particle size of zero-valent iron or zero-valent iron bimetallic particles prepared by traditional stirred reactors Industrial problems such as uneven distribution, poor reproducibility of batch production, and large process amplification effect

Method used

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  • Supergravity preparation method for chitosan-supported nanoscale zero-valent iron and bimetal composite material thereof
  • Supergravity preparation method for chitosan-supported nanoscale zero-valent iron and bimetal composite material thereof
  • Supergravity preparation method for chitosan-supported nanoscale zero-valent iron and bimetal composite material thereof

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Embodiment 1

[0027] A high-gravity preparation method for chitosan-loaded nano-zero-valent iron and its bimetallic composite material. The mixed solution of chitosan and metal salt and the reducing agent are simultaneously sent into the high-gravity reactor for reaction. After the reaction, magnetic separation The reaction product is repeatedly washed with deionized water until neutral, and vacuum-dried to obtain chitosan-loaded nano-zero-valent iron and bimetallic composite particles, which specifically includes the following steps:

[0028] figure 1 It is the experimental flow chart of preparing chitosan-loaded nano-zero-valent iron particles with impinging flow-rotating packed bed as shown in this embodiment, and the specific steps are: take 5 g of chitosan and dissolve it in 1L 0.05mol / L A solution of chitosan with a concentration of 0.5% was prepared in an aqueous solution of nitric acid, and FeCl was added to it 2 • 4H 2 O (0.2 mol, 39.76 g) was prepared into an iron salt solution ...

Embodiment 2

[0031] A kind of supergravity preparation method of chitosan loaded nano-iron-copper bimetal composite particle, it comprises the following steps:

[0032] Weigh 1 g of chitosan and dissolve it in 1L of 0.05mol / L nitric acid aqueous solution to form an aqueous solution with a chitosan concentration of 0.1%, and add FeSO 4 •7H 2 O (0.04 mol, 11.12 g ) and CuCl 2 • 2H 2 O (0.01 mol, 1.70 g ) was configured into a solution with a metal ion concentration of 0.05 mol / L, in which Cu 2+ The mole fraction of the metal salt is 20%; in addition, according to BH 4 - and the molar ratio of metal ions is 3:1, weigh KBH 4 (0.15 mol, 8.09 g) was dissolved in 1L water to make KBH 4 Aqueous solution with a concentration of 0.15 mol / L; mix the above-mentioned chitosan and metal salt solution with KBH 4 The aqueous solution was added to the storage tank respectively, and the centrifugal pump was started to transport the two raw material liquids from the liquid distributor to the rotating...

Embodiment 3

[0034] A method for preparing chitosan-loaded nano-iron-nickel bimetal composite particles under high gravity, comprising the steps of:

[0035] Weigh 5 g of chitosan and dissolve it in 1L of 0.05mol / L nitric acid aqueous solution to prepare an aqueous solution with a chitosan concentration of 0.5%, and add Fe(NO 3 ) 2 (0.08 mol, 14.39 g) and NiCl 2 •6H 2 O (0.12 mol, 28.52 g) was prepared into a solution with a metal ion concentration of 0.2 mol / L, in which Ni 2+ The mole fraction of the metal salt is 60%; in addition, according to BH 4 - And the molar ratio of ferrous ion is 2.5:1, weigh NaBH 4 (0.5 mol, 18.92 g) was dissolved in 1L water to make NaBH 4 Aqueous solution with a concentration of 0.5 mol / L; mix the above-mentioned chitosan and metal salt mixed solution with NaBH 4 The aqueous solution is added to the storage tank respectively, and the centrifugal pump is started to transport the liquid into the impingement flow-rotary packed bed main device through the...

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Abstract

The invention discloses a supergravity preparation method for chitosan-supported nanoscale zero-valent iron and a bimetal composite material thereof, and belongs to the technical field of nanometer materials. The invention aims at providing a method for continuously preparing chitosan-supported nanoscale zero-valent iron and a bimetal composite material thereof. The method comprises the followingsteps: conveying the mixed solution of chitosan and metal salt, and a reducing agent into a supergravity reactor simultaneously, and reacting; magnetically separating reaction products after the reaction is concluded; repeatedly cleaning the reaction products through deionized water and absolute ethyl alcohol until the reaction products are neutral; and carrying out vacuum drying on the reaction products to obtain the chitosan-supported nanoscale zero-valent iron and nano-iron bimetal composite particles. According to the method, the chitosan-supported nanoscale zero-valent iron or the nano-iron bimetal composite particles are prepared in one step, and the method is simple in process, short in reaction time, low in cost, and capable of realizing large-scale production; and meanwhile, the prepared chitosan-supported nanoscale zero-valent iron or nano-iron bimetal composite particles are small in particle size, and high in dispersity, stability and reactivity, and have an industrializedapplication prospect.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a supergravity preparation method of chitosan loaded with nanometer zero-valent iron and a bimetallic composite material thereof. Background technique [0002] With the rapid development of society and economy, the pollution of heavy metal ions in water is becoming more and more serious. Since heavy metals cannot be biodegraded and cause serious harm to human body after long-term ecological accumulation, heavy metal pollution has become an environmental pollution problem of widespread concern worldwide. Therefore, the development of cheap and efficient methods to remove heavy metal ions in water is extremely important to human health and safety and the ecological environment, and it is an important issue that needs to be solved urgently in the future. Nanoscale zero-valent iron (NZVI) has become a research field that has attracted much attention because of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00C02F1/28B82Y30/00B82Y40/00C02F1/70C02F101/20
CPCB82Y30/00B82Y40/00C02F1/28C02F1/705B22F9/24C02F2101/20B22F1/07B22F1/054
Inventor 范红蕾刘有智焦纬洲祁贵生
Owner ZHONGBEI UNIV
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