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The Method of Removing Cadmium(Ⅱ) in Water Using Fe3O4-MNO2 Composite Adsorbent

A fe3o4-mno2, composite adsorption technology, used in adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of long adsorption treatment time, difficult recovery, etc., and achieve fast speed and high treatment efficiency. , The effect of low processing cost

Active Publication Date: 2016-06-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problems that existing adsorbents for removing cadmium (II) in water have long adsorption treatment time and difficult recovery, and provide a method to utilize Fe 3 o 4 -MnO 2 Method for Removing Cadmium(Ⅱ) from Water by Composite Adsorbent

Method used

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  • The Method of Removing Cadmium(Ⅱ) in Water Using Fe3O4-MNO2 Composite Adsorbent
  • The Method of Removing Cadmium(Ⅱ) in Water Using Fe3O4-MNO2 Composite Adsorbent
  • The Method of Removing Cadmium(Ⅱ) in Water Using Fe3O4-MNO2 Composite Adsorbent

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specific Embodiment approach 1

[0013] Specific implementation mode one: this implementation mode is Fe 3 o 4 -MnO 2 The preparation method of composite adsorbent is specifically carried out according to the following steps: 0.20molFeSO 4 ·7H 2 O and 10.0g of polyvinylpyrrolidone were dissolved in 100mL of deionized water, mixed well and added to 900mL of 90°C deionized water, then added 0.40mol NaOH, stirred at 90°C for 2min, and then added 0.2mol KMnO 4 , and aged at 90°C for 3-6 hours under stirring conditions, cooled to room temperature, removed the supernatant, washed three times with deionized water, then washed three times with absolute ethanol, and dried at 80°C for 1-3 hours , get Fe 3 o 4 -MnO 2 composite adsorbent.

[0014] Reaction principle:

[0015] When the molar ratio of iron to manganese is 4.5:1, the chemical reactions of formulas (1) and (2) happen:

[0016] FeSO 4 +2NaOH→Fe(OH) 2 +Na 2 SO 4 (1)

[0017] 9Fe(OH) 2 +2KMnO 4 →3Fe 3 o 4 +2MnO 2 +2KOH+8H 2 O(2)

[0018] In...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that: the temperature is 90° C. and the condition is stirred for 3 hours. Others are the same as the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that it is dried at 80° C. for 2 hours. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for preparing a Fe3O4-MnO2 adsorbing agent and removing cadmium (II) in water by using the Fe3O4-MnO2 adsorbing agent, and relates to the method for preparing the adsorbing agent and removing the cadmium (II) in water by using the adsorbing agent. The invention aims at overcoming the problem that the existing adsorbing agent for removing the cadmium (II) in water is long in adsorption processing time and difficult to recovery. The method for preparing the Fe3O4-MnO2 adsorbing agent comprises: preparing by using Fe3O4*7H2O, polyvinylpyrrolidone, deionized water, NaOH and KMnO4 according to a molar ratio of 1:1 of the Fe3O4*7H2O to the KMnO4. The method for removing the cadmium (II) in water comprises: adjusting pH of water polluted by the cadmium (II), adding the Fe3O4-MnO2 composite adsorbing agent and stirring for adsorbing, and thereby completing rapid removal of the cadmium. The method has the advantage of achieving efficient removal of the cadmium (II). The method is mainly used for removing the cadmium (II) in polluted water.

Description

technical field [0001] The invention relates to a method for removing cadmium (II) in water by using an adsorbent. Background technique [0002] With the development of the chemical industry, cadmium is widely used in electroplating industry, chemical industry, electronics industry and nuclear industry, etc., which produces a large amount of cadmium-containing wastewater. If the wastewater is not discharged up to the standard, it will harm the sustainable development of the ecological environment and human beings. serious threat to health. The frequency of cadmium pollution incidents is gradually increasing, which will pollute the environment, affect the safety of aquatic organisms, easily cause psychological panic among residents in polluted areas, and adversely affect human life and health. For example, on December 15, 2005, the cadmium pollution incident in the Beijiang River Basin of Guangdong; on August 3, 2009, the cadmium pollution incident in Liuyang, Hunan; in Sept...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/62
Inventor 赵健慧崔福义赵志伟
Owner HARBIN INST OF TECH