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Preparation method of manganese dioxide/iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent and application of three-dimensional silicon dioxide adsorbent in As (III) adsorption

A technology of ferric oxyhydroxide and manganese dioxide, which is applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., and can solve the problem of limited metal ion adsorption performance, poor heavy metal adsorption selectivity, and low adsorption capacity, etc. problems, achieve good reusability, novel modified adsorbent, and large adsorption capacity

Pending Publication Date: 2021-12-14
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional adsorbents mainly include carbon-containing composite materials, various active oxides, and various inorganic synthetic adsorption materials, etc., which have disadvantages such as high cost, poor adsorption selectivity for heavy metals, and relatively low adsorption capacity.
Due to its high specific surface area and large porosity, mesoporous silica is widely used in adsorbents, but its adsorption performance for metal ions is limited and its selectivity is poor.

Method used

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  • Preparation method of manganese dioxide/iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent and application of three-dimensional silicon dioxide adsorbent in As (III) adsorption
  • Preparation method of manganese dioxide/iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent and application of three-dimensional silicon dioxide adsorbent in As (III) adsorption
  • Preparation method of manganese dioxide/iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent and application of three-dimensional silicon dioxide adsorbent in As (III) adsorption

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1 Three-dimensional silica adsorbent MnO loaded with manganese dioxide / iron oxyhydroxide 2 / FeOOH / KIT-6 (1) The preparation method is as follows

[0035] 1. Preparation of three-dimensional mesoporous material KIT-6

[0036]Mix 4g triblock copolymer P123, 120g deionized water and 20mL concentrated hydrochloric acid, stir overnight at 35-45°C until dissolved, add 4g n-butanol, continue stirring for 1-3h, then add 8.6g n-butanol dropwise Ethyl silicate, continue to stir for 24-48 hours, then transfer the resulting mixture into a stainless steel reactor, conduct a hydrothermal reaction at 100°C for 24 hours, cool the product naturally to room temperature, filter, wash with water and ethanol until neutral, and dry After that, it was calcined in a muffle furnace at 550°C for 12 hours to obtain the three-dimensional mesoporous material KIT-6.

[0037] 2. Preparation of FeOOH / KIT-6

[0038] 5g three-dimensional mesoporous material KIT-6, 30mL concentration is 0.05mo...

Embodiment 2

[0043] Example 2 Three-dimensional silica adsorbent MnO loaded with manganese dioxide / iron oxyhydroxide 2 Application of / FeOOH / KIT-6 in Adsorption of As(Ⅲ)

[0044] (1) MnO 2 Adsorption effect of / FeOOH / KIT-6 on arsenic under different acidity

[0045] Method: Weigh 10 mg of MnO prepared in Example 1 with different Fe / Mn molar ratios 2 / FeOOH / KIT-6, respectively added to 10mL with a concentration of 20mg·L -1 In the As(III) solution, the pH of the solution was adjusted to 1, 3, 5, 7, 9, 11 respectively, and the adsorption was oscillated at 30°C and 180r / min in an oscillating box for 24h. The result is as Figure 4a and Figure 4b shown.

[0046] Depend on Figure 4a It can be seen that with the increase of the Fe / Mn molar ratio, the adsorption capacity of the adsorbent for As(III) gradually decreases, and the adsorption rate of the adsorbent for As(III) is the largest when the pH is 1. When the pH was 1 and the Fe / Mn molar ratio was 4:5, the adsorption capacity of the...

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Abstract

The invention discloses a preparation method of a manganese dioxide / iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent and application of the three-dimensional silicon dioxide adsorbent in As (III) adsorption. The preparation method comprises the following steps: mixing a three-dimensional mesoporous material KIT-6, a FeCl3 solution and a HCl solution, uniformly stirring at room temperature, transferring into a reaction kettle for hydrothermal reaction, washing the obtained product with deionized water until the product is neutral, and drying to obtain an intermediate product FeOOH / KIT-6; mixing MnSO4.H2O with FeOOH / KIT-6, carrying out a reflux reaction, adding a KMnO4 aqueous solution, continuously carrying out the reflux reaction, washing the obtained product with deionized water to be neutral, and drying to obtain the manganese dioxide / iron oxide hydroxide loaded three-dimensional silicon dioxide adsorbent. The prepared adsorbent is used for separating and removing heavy metal ions As (III), the maximum saturated adsorption capacity is 39.77 mg.g <-1 >, and an effective method is provided for detecting and controlling heavy metal pollution in an environmental water sample.

Description

technical field [0001] The invention belongs to the technical field of adsorbent material preparation, and in particular relates to a three-dimensional silica adsorbent loaded with manganese dioxide / iron oxyhydroxide and a preparation method thereof. Background technique [0002] Industrial wastewater with excessive heavy metal content is discharged into the environment without proper treatment, which will cause water pollution, damage aquatic ecosystems, and pose a threat to human 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. This is mainly due to the fact that arsenic reacts with -SH on the enzyme in the organism, which will produce toxicity and harm the human body. And studies have shown that the toxicity of trivalent arsenic in inorganic arsenic is 60 times that of pentavalent arsenic. At present, it is urgent to design a new type of adsor...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/10
CPCB01J20/103B01J20/08B01J20/06C02F1/281C02F2101/103
Inventor 崔俊硕丛小珊王丹丹娄振宁单炜军于海彪王月娇冯小庚熊英
Owner LIAONING UNIVERSITY
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