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Magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic and preparation method thereof

A composite oxide and polymorphic technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal compounds, etc., can solve the problems of easy hardening, difficult separation of arsenic-removing composite oxide adsorbents, and removal efficiency High adsorption capacity, excellent water purification efficiency, easy magnetic separation effect

Pending Publication Date: 2021-06-22
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems of difficult separation, easy hardening, and low removal efficiency of existing arsenic-removing composite oxide adsorbents, and provides a magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic and its preparation method

Method used

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  • Magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic and preparation method thereof
  • Magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic and preparation method thereof
  • Magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic and preparation method thereof

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specific Embodiment approach 1

[0026] Specific embodiment 1: This embodiment is a magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic, which is a coated core-shell structure, with magnetic ferroferric oxide as the core and copper-lanthanum composite oxide as the shell .

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the molar ratio of magnetic ferric iron tetroxide, copper element and lanthanum element in the magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic is ( 1~4):1:(0.5~2). Others are the same as the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment three: This embodiment is the preparation method of the magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic in the specific embodiment one, specifically as follows:

[0029] 1. Preparation of core magnetic ferric oxide: Mix soluble ferric salt and soluble ferrous salt in water to obtain a mixed solution of ferric salt, heat the mixed solution of ferric salt to 50°C to 80°C and keep the temperature between 50°C and 80°C Slowly stir for 0.5h~1h under the condition of 50℃~80℃ and rapid stirring, then dropwise add lye to pH 10~12 under the condition of 50℃~80℃ and rapid stirring, continue to stir for 2h under the condition of 50℃~80℃ and rapid stirring ~2.5h, stop stirring, age at 50°C~80°C for 12h~24h, wash with water, filter, dry at 80°C~85°C, and grind to obtain core magnetic iron tetroxide;

[0030] The molar ratio of ferric iron and ferrous iron in the iron salt mixed solution is 1:(2~0.5);

[0031] The molar concentratio...

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Abstract

The invention discloses a magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic and a preparation method thereof, and relates to a composite oxide adsorbent for removing arsenic and a preparation method of the composite oxide adsorbent. The invention aims to solve the technical problems that the existing arsenic removal composite oxide adsorbent is difficult to separate, easy to harden and low in removal efficiency. The magnetic iron-based composite oxide adsorbent for removing polymorphic arsenic is of a coated core-shell structure, magnetic ferroferric oxide is used as a core, and copper-lanthanum composite oxide is used as a shell. The preparation process is simple, the materials are environment-friendly, and the raw materials are economical and low in cost; the adsorbent has the advantages of easy magnetic separation of ferroferric oxide and good arsenic adsorption effect of copper-lanthanum composite oxide, and makes up for the deficiency of independent use of each component; the adsorbent is used for removing arsenic in water, has a wide application range and good magnetic separation performance while keeping high arsenic removal efficiency, and can be magnetically separated in three minutes, so that the treatment cost of adsorbing and removing arsenic in water is reduced.

Description

technical field [0001] The invention relates to a composite oxide adsorbent for removing arsenic and its preparation method Background technique [0002] Providing clean drinking water is one of the most cost-effective and effective ways to improve a country's public health. Worldwide, groundwater is still the main source of drinking water, and among the common heavy metal pollutants in water, arsenic is one of the most dangerous pollutants. Arsenic pollution in water comes from both natural and man-made sources. Arsenic enters groundwater and the food chain through rock weathering, volcanic eruptions, desorption of arsenic-containing sediments in water, and industrial emissions. The presence of arsenic in groundwater poses a serious threat to the public health of millions of people around the world, especially in India, Bangladesh and China. Long-term drinking of water with excessive arsenic content will cause various adverse effects on health, including acute poisoning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/10C02F101/30C02F101/22
CPCB01J20/06B01J20/28009C02F1/281C02F2101/103C02F2101/30C02F2101/22C02F2101/105
Inventor 韩钰荧张伟张正雯李白雪宋庆帅
Owner YANTAI UNIV
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