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Iron and manganese oxide-charcoal composite material and preparation method and application thereof

A technology of iron-manganese oxides and composite materials, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of poor adsorption performance, increase the contact area, enrich the morphological structure, and enhance the electrostatic adsorption effect Effect

Active Publication Date: 2019-08-09
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an iron-manganese oxide-biochar composite material and its preparation method and application, which solves the problem of poor adsorption performance of existing adsorbents on Cr(VI)

Method used

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  • Iron and manganese oxide-charcoal composite material and preparation method and application thereof
  • Iron and manganese oxide-charcoal composite material and preparation method and application thereof
  • Iron and manganese oxide-charcoal composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 4 parts of 5g 100-mesh corn stalk powder into a beaker, and then add modifiers (modifier 1: 100 mL of ferric chloride with a concentration of 0.15 mol / L and 100 mL of potassium permanganate with a concentration of 0.05 mol / L Modifier 2: concentration is 0.05mol / L ferric chloride 100mL and concentration is 0.05mol / L potassium permanganate 100mL; Modifier 3: concentration is 0.05mol / L ferric chloride 100mL and concentration is 0.15 mol / L potassium permanganate 100mL; modifier 4: ferric chloride 100mL with a concentration of 0.05mol / L and potassium permanganate 100mL with a concentration of 0.25mol / L), the corresponding iron, manganese and corn stalk powder theory The mass ratio is 3:1:18, 1:1:18, 1:3:18, 1:5:18. Soak for 12-14 hours after ultrasonic mixing, then wash the soaked mixture until neutral and dry at 60-70°C for 12 hours to obtain the first product 1, the first product 2, the first product 3, and the first product 4 in sequence.

[0044] The first product...

Embodiment 2

[0046] In this example, the iron-manganese oxide-biochar composite materials 1-4 prepared in Example 1 are used to treat Cr(VI)-containing wastewater, including the following steps:

[0047] Prepare a 100mg / L Cr(VI) solution, adjust the pH to 2 with 1mol / L NaOH and HCl, and measure 4 parts of 50ml of the above 100mg / L Cr(VI) solution with a volumetric flask. The above iron-manganese oxide-biochar composite materials 1-4 were added respectively, and the dosage of the iron-manganese oxide-biochar composite material was 2 g / L. They were placed in constant temperature shaking at 30°C. The speed of the constant temperature oscillator is 120r / min, and the oscillation time is 24h. After the reaction, the supernatant solution was taken, and the remaining Cr(Ⅵ) content in the wastewater was measured by ultraviolet spectrophotometry, and the removal rate was calculated.

[0048] Such as figure 2 It can be seen that the removal rate of Cr(Ⅵ) by iron-manganese oxide-biochar composite ...

Embodiment 3

[0050] In this embodiment, the first product 3 prepared in Example 1 is put into a tube furnace, and the temperature is 80-160 cm 3 Nitrogen was introduced at a rate of 5-8 °C / min, and the temperature was increased from room temperature to 300 °C, 400 °C, and 500 °C at a rate of 5-8 °C / min, and pyrolyzed at this temperature for 2 hours, and then cooled to room temperature to obtain 3 different The iron-manganese oxide-biochar composites prepared at the pyrolysis temperature were labeled as F1M3BC300, F1M3BC400, and F1M3BC500, respectively.

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Abstract

The invention relates to the technical field of adsorbents, in particular to an iron and manganese oxide-charcoal composite material and a preparation method and application thereof. The invention discloses the iron and manganese oxide-charcoal composite material. An iron oxide in the composite material has the high Zeta potential and is loaded on the surface of charcoal, the static adsorption effect can be enhanced, Cr(VI) in the anion state is adsorbed, the loaded manganese oxide can increase the specific surface area of charcoal, the porosity is increased, metal contaminants can be adsorbed, in addition, the manganese oxide has the high oxidation, iron can be oxidized into a nanoscale oxide, and the contact area between the iron oxide and the Cr(VI) in the anion state is increased. Accordingly, iron and manganese oxides are loaded on the charcoal to obtain the iron and manganese oxide-charcoal composite material, so that the number of functional groups and adsorption sites of heavymetal on the surface of charcoal is increased, and therefore the adsorption capability of heavy metal hexavalent chromium is improved.

Description

technical field [0001] The invention relates to the technical field of adsorbents, in particular to an iron-manganese oxide-bio-char composite material and its preparation method and application. Background technique [0002] Heavy metal pollution in water is an environmental pollution problem with great harm and influence today. Wastewater containing Cr(VI) mainly comes from industries such as metallurgy, electroplating, printing and dyeing, and mining. The toxicity of chromium is related to its valence state. Cr(VI) is 100 times more toxic than Cr(III), and can invade the human body through the digestive tract, respiratory tract, skin and mucous membranes, be absorbed by the human body and accumulate in the body. When the water contains excessive hexavalent chromium, it has a strong lethal effect on aquatic organisms. my country has listed hexavalent chromium as a priority pollutant list. At present, the removal methods of wastewater containing hexavalent chromium mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/70C02F101/22
CPCB01J20/06B01J20/20C02F1/288C02F1/70C02F2101/22
Inventor 朱翼洋戴文灿邓锴潘婷
Owner GUANGDONG UNIV OF TECH
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