Preparation method of delta-type manganese dioxide and application of delta-type manganese dioxide to removal of trivalent arsenic from water through oxidation

A technology of manganese dioxide and trivalent arsenic, applied in manganese oxide/manganese hydroxide, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve problems such as human hazards, achieve low operating costs, and high electronegativity , the effect of large specific surface area

Inactive Publication Date: 2012-08-01
SHENYANG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, commonly used oxidants such as free chlorine, hydrogen peroxide, etc. are restricted to varying degrees in practical applications, and the dissolution of reaction products in water may cause a certain degree of harm to the human body.

Method used

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Examples

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preparation example Construction

[0015] 1. The preparation method of δ-type manganese dioxide: prepare potassium permanganate solution and manganese sulfate solution respectively with distilled water, the concentration of potassium permanganate solution is 0.05mol / L, and the concentration of manganese sulfate solution is 0.07mol / L. Potassium permanganate solution and manganese sulfate solution are stirred and mixed, the volume ratio of potassium permanganate solution and manganese sulfate solution is 5:6, shake and mix for 6 hours to form a brownish black precipitate, that is, the reaction generates δ-type manganese dioxide:

[0016] 3Mn 2+ +2MnO 4 - +2H 2 O=5MnO 2 +4H +

[0017] Let it stand for 30 minutes, wash the precipitate with distilled water until it does not contain sulfate ions, dry it at 80°C for 16 hours, grind it, and set it aside.

[0018] 2. The application of delta-type manganese dioxide oxidation to remove trivalent arsenic in water:

example 1

[0020] Take 25ml of untreated water sample containing 1mg / L of trivalent arsenic (As(III)) and pH4, add δ-type manganese dioxide at the dosage of 0.2g / L, and add δ-type manganese dioxide at 25°C at 200r / min Rotate and oscillate for 90 minutes, centrifuge and take the supernatant to determine the As(III) content is 6.27 μg / L, and the adsorption removal rate reaches 99.4%.

example 2

[0022] Take 25ml of untreated water sample containing 1 mg / L of trivalent arsenic (As(III)) and pH 4, add δ-type manganese dioxide at a dosage of 0.4 g / L, and add δ-type manganese dioxide at a rate of 200r / min at 25°C. Rotate and oscillate for 90 minutes, centrifuge and take the supernatant to determine the As(III) content is 2.04 μg / L, and the adsorption removal rate reaches 99.8%.

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Abstract

The invention discloses a preparation method of delta-type manganese dioxide and application of delta-type manganese dioxide to removal of trivalent arsenic from water through oxidation, and solves the problems of complex process, high running cost, and low treatment efficiency of trivalent arsenic in the conventional technology for treating water polluted by trivalent arsenic. The delta-type manganese dioxide is prepared from a potassium permanganate solution and a manganese sulfate solution, and water containing trivalent arsenic is subjected to conventional water treatment by using delta-type manganese dioxide. The delta-type manganese dioxide prepared from potassium permanganate and manganese sulfate has a large specific surface area, is high in electronegativity, and is easy to participate and separate; and trivalent arsenic can be effectively oxidized to be removed from water by using delta-type manganese dioxide. The application of delta-type manganese dioxide has the advantages of high oxidization and removal efficiency, simple process, flexibility and convenience in operation and low running cost.

Description

technical field [0001] The invention relates to water treatment technology and application, in particular to a preparation method of δ-type manganese dioxide and its application for oxidizing and removing trivalent arsenic in water. Background technique [0002] Arsenic pollution is a global problem, especially in developing countries where groundwater is the main drinking water. Severe arsenic pollution not only occurs in various mining and chemical industrial production processes, but also in Bangladesh, India, West Bengal, China's Inner Mongolia, Taiwan, Vienna, Chile and other countries have regional catastrophic arsenic pollution in water. [0003] The main forms of inorganic arsenic in water are As(V) and As(Ⅲ). The toxicity of As(Ⅲ) is much higher than that of As(V), and the activity of As(Ⅲ) in the environment is also higher than that of As(V). Conventional arsenic removal methods cannot effectively remove trivalent arsenic in the solution directly, so it is first ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C02F1/62C02F1/72
Inventor 王楠梁成华杜立宇李杰颖兰希平崔慧瑛
Owner SHENYANG AGRI UNIV
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