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Method for removing heavy metal cadmium and lead pollutants in water by sodium alginate/gelatin coated nano 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 loose structure, easy leakage, and fragility, and achieve recycling, The effect of low cost and simple preparation process

Active Publication Date: 2015-06-24
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

Method used

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  • Method for removing heavy metal cadmium and lead pollutants in water by sodium alginate/gelatin coated nano zero-valent iron
  • Method for removing heavy metal cadmium and lead pollutants in water by sodium alginate/gelatin coated nano zero-valent iron
  • Method for removing heavy metal cadmium and lead pollutants in water by sodium alginate/gelatin coated nano zero-valent iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: adjustment coating raw material SA, Gel concentration are respectively 1.5%, 0.5%, 1.5%, 1.0%, 2.0%, 1.5%, to freshly prepared 30mg nanometer Fe 0 Coated and added to 200mL of 100mg·L deoxidized -1 In the Cd(II) reactor, the reaction was carried out at room temperature (25°C) under 250rpm shaking conditions. The pH was not adjusted during the reaction. The quantitative reaction solution was taken at regular intervals and filtered through a 0.45μm membrane. The NovAA400 atomic absorption spectrometer was used to analyze The remaining Cd(II) concentration in the solution was detected and its removal rate was calculated. The results showed that when the concentrations of coating materials SA and Gel were 1.5% and 0.5%, respectively, the removal rate of Cd(II) was relatively highest, and the removal rate could reach 97.9% after shaking reaction for 24 hours.

Embodiment 2

[0041] Embodiment 2: adjustment coating raw material SA, Gel concentration are respectively 1.5%, 0.5%, 1.5%, 1.0%, 2.0%, 1.5%, to freshly prepared 70mg nanometer Fe 0 Coated and added to 200mL of 500mg·L deoxygenated -1 In the Pb(II) reactor, the reaction was carried out at room temperature (25°C) under 250rpm shaking conditions. The pH was not adjusted during the reaction. The quantitative reaction solution was taken at regular intervals and filtered through a 0.45μm membrane. The NovAA400 atomic absorption spectrometer was used to analyze The remaining Pb(II) concentration in the solution was detected, and its removal rate was calculated. The results show that the reaction with Cd(II) is the same, when the concentrations of SA and Gel are 1.5% and 0.5% respectively, the coated nano-Fe 0 The reactivity is relatively the highest, and the removal rate of Pb(II) can reach 95.3% after 5 hours of reaction.

Embodiment 3

[0042] Embodiment 3: in 250mL reactor, adding concentration is 200mg / L, 100mg / L, 50mg / L Cd (II) solution 200mL respectively, add 1.5%SA, 30mg nanometer Fe of 0.5%Gel ratio coating successively 0 , to investigate the coated nano-Fe 0 The effect of dosage on the removal effect of Cd(II), and the uncoated nano-Fe 0 Gel spheres removed 100 mg / L Cd(II) for comparative shaking reactions. The experimental results show that the uncoated Fe 0 The gel spheres hardly reacted with Cd(II).

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Abstract

The invention relates to a method for removing heavy metal cadmium and lead pollutants in water by sodium alginate / gelatin coated nano zero-valent iron. By using sodium alginate / gelatin as a main raw material and CaCl2 as a crosslinking agent, the nano zero-valent iron is synergically immobilized. Researches show that the nano zero-valent iron has very high stability and researches on the effect of removing heavy metal ions Cd<2+> and Pb<2+> show that the zero-valent iron has a relatively good removal effect which can reach over 95%. The immobilized nano zero-valent iron prepared by the invention has the advantages of being green and environmental-friendly, has relatively high reaction activity and stability, and has a relatively good removal effect on heavy metal ions both Cd<2+> and Pb<2+>.

Description

technical field [0001] The invention relates to a method for repairing heavy metals cadmium and lead in water by a sodium alginate / gelatin-coated nano zero-valent iron water treatment agent, belonging to the field of sewage treatment. Background technique [0002] Heavy metals mainly come from industrial wastewater such as mining, mineral processing, smelting, electroplating, chemical industry, tanning and papermaking. Heavy metals entering water cannot be degraded by organisms, but can be enriched through the food chain and eventually enter the human body, interfering with normal physiological functions and damaging human health. Pb(II) can enter the human body through the skin, digestive tract, respiratory tract, etc., accumulate in the liver, kidney, brain tissue, etc., and spread to the whole body through the blood. The damage to the nervous system, hematopoietic system and kidney is the most serious. Headache, abdominal pain, twitching, fatigue, muscle pain, loss of ap...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/62C02F1/28
Inventor 康海彦张晗毛艳丽焦学然王现丽吴俊峰刘雪平郭一飞王增欣陈松涛
Owner HENAN UNIV OF URBAN CONSTR
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