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Method for removing azo dye in water by using sodium alginate or gelatin coated nanoscale zero-valent iron

A technology of nano-zero-valent iron and sodium alginate, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as easy leakage and fragility, and achieve low cost and excellent preparation process Simple, highly reactive effects

Active Publication Date: 2015-09-09
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when bacteria or enzymes are coated with a single sodium alginate, there are problems such as relatively loose structure, fragility, and easy leakage. Adding gelatin (Gel) for synergistic immobilization can improve the structure of polymer gel balls and broaden its application fields.

Method used

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  • Method for removing azo dye in water by using sodium alginate or gelatin coated nanoscale zero-valent iron
  • Method for removing azo dye in water by using sodium alginate or gelatin coated nanoscale zero-valent iron
  • Method for removing azo dye in water by using sodium alginate or gelatin coated nanoscale zero-valent iron

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Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: adjust coating raw material SA, Gel concentration to be 1.5%, 1.0%, to freshly prepared 30mg, 50mg nanometer Fe respectively 0 For coating, under the condition of not adjusting the pH of the initial solution, the nano-zero-valent iron coating material was added to the deoxidized 150mL 50mg L -1 In the Reactive Brilliant Red X-3B reactor, the reaction is carried out at room temperature (25°C) under 250rpm shaking conditions, and the quantitative reaction solution is taken at intervals of a certain period of time. Detect and calculate its removal rate. The results show that under neutral reaction conditions, coating 50mg nano-Fe 0 The gel ball reacted for 4.0h, and the removal rate of Reactive Brilliant Red X-3B could reach 78.7%.

Embodiment 2

[0040] Embodiment 2: In 250mL reactor, add 50mg·L respectively -1 Reactive Brilliant Red X-3B solution 150mL, the initial pH was adjusted to 3.0, 7.0, 9.0 with HCl solution or NaOH solution, and the gel balls coated with 50mg nanometer zero-valent iron were respectively moved into the reactor, at room temperature (25 ℃ ) under 250rpm shaking conditions, to investigate the effect of different solution pH on coating nano-Fe 0 To remove the effect of reactive brilliant red X-3B, take a quantitative reaction solution at intervals of a certain period of time and use a 722-type ultraviolet-visible spectrophotometer to detect the remaining reactive brilliant red X-3B concentration in the solution and calculate its removal rate. The experimental results show that when the pH is 3.0, the removal rate can reach 99.6% when the 50 mg nanometer zero-valent iron gel ball is shaken and reacted for 4.0 h.

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Abstract

The present invention relates to a method for removing azo dye in water by using sodium alginate or gelatin coated nanoscale zero-valent iron. According to the method, the sodium alginate or gelatin is a main raw material, CaCl2 is a crosslinking agent, and the nanoscale zero-valent iron is cooperatively immobilized. The study shows that, the nanoscale zero-valent iron is high in stability and is capable of staying stable for six months or more. The effect of removing azo dye active bright-red X-3B is studied, and the result shows that the removal effect is excellent with the removal rate of more than 99.6%. The immobilized nanoscale zero-valent iron prepared by this present invention is environmentally friendly and non-toxic, high in reaction activity and stability, and high in the effect of removing azo dye active bright-red X-3B.

Description

technical field [0001] The invention relates to a method for removing an azo dye reactive brilliant red X-3B from water with a sodium alginate / gelatin-coated nano zero-valent iron water treatment agent, belonging to the field of wastewater treatment. Background technique [0002] In the printing and dyeing industry, azo dyes are widely used, and their usage accounts for more than 70% of the total dyes at present. However, azo dye wastewater has a large amount of water, high chroma, and many pollutants contained in it. The chemical properties of the wastewater are stable, the BOD / COD value is relatively low, and the biodegradability is poor. Therefore, this type of wastewater has become one of the recognized refractory wastewater. How to effectively remove azo dyes in water has received widespread attention from the society. [0003] As a new type of material for environmental pollution remediation, nano-zero-valent iron has a high specific surface area (33.5m 2 / g, ordinar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01J13/02C02F1/58C02F1/28C02F1/70
Inventor 康海彦毛艳丽王红强张晗胡红伟吴俊峰朱慧杰郭一飞王增欣张岩
Owner HENAN UNIV OF URBAN CONSTR
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