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Preparation and application of cubic spinel type Mn/Al oxide-sludge biochar material

A spinel-type, biochar technology, applied in water/sludge/sewage treatment, water pollutants, water/sewage treatment, etc., to achieve the effect of stable source, large specific surface area and good chemical stability

Inactive Publication Date: 2019-07-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cubic spinel oxygen and its derivative composites have been used to adsorb and remove various pollutants, such as heavy metals, antibiotics and dyes, due to their high stability and large specific surface area. There are few reports on the adsorption of phosphorus in water.

Method used

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  • Preparation and application of cubic spinel type Mn/Al oxide-sludge biochar material
  • Preparation and application of cubic spinel type Mn/Al oxide-sludge biochar material
  • Preparation and application of cubic spinel type Mn/Al oxide-sludge biochar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of cubic spinel Mn / Al oxygen body-sludge biochar: first, dehydrated sludge was dried to constant weight at 105 °C, and ground through a 200-mesh sieve. Then 2.5 g of powdered sludge was added to 50 mL of deionized water and stirred for 1 h to disperse evenly in the solution, and then 0.01 mol of manganese chloride tetrahydrate (MnCl 2 4H 2 O) and 0.02 mol aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) Dissolve into the solution containing the sludge powder and keep stirring with a magnetic stirrer for 30 min. During stirring, 5 M NaOH was added dropwise to the mixed solution until the pH was greater than or equal to 10. Subsequently, the mixed solution was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel hydrothermal reactor and reacted at 453 K for 12 h. After the reaction was finished and cooled naturally, the filtered precipitate was washed with deionized water until neutral, and finally dried at 333 K for 24 h. The obtained sampl...

Embodiment 2

[0027] The effect of different pH values ​​on MA-BC adsorption and removal of phosphorus in Example 1: Weigh 0.1 g MA-BC and add it to a conical flask containing 100 mL of phosphate solution with a concentration of 50 mg / L, and use 0.1M HCl and NaOH adjusted the pH of the solution to 2-10 with an interval of 1, and then placed the Erlenmeyer flask in a constant temperature shaker at 298 K for 24 h. After the adsorption was completed, the supernatant was taken, filtered through a 0.45 μm membrane, and the phosphate concentration was detected with a UV-vis spectrophotometer. The result is as image 3 As shown, when the pH is equal to 3, the maximum adsorption capacity is 28.2 mg / g. When the pH is equal to 2, the adsorption amount is the smallest, about 0.2 mg / g. When the pH is greater than 3, the adsorption amount shows a decreasing trend as the pH increases.

Embodiment 3

[0029] The MA-BC prepared in Example 1 was used for the kinetics study of adsorption and removal of phosphorus: Weighed 0.1 g of MA-BC and added it to a conical flask containing 100 mL of phosphate solution with a concentration of 50 mg / L, and adjusted The pH of the solution was 3, and then the Erlenmeyer flask was placed in a constant temperature shaker at 298 K for 48 h, and the solution was shaken at different time periods (1 min, 5 min, 10 min, 30 min, 1 h, 2 h, 5 min, h, 12 h, 24 h, 36 h, 48 h) Take the supernatant, filter it with a 0.45 μm membrane, and detect the phosphate concentration with a UV-vis spectrophotometer. The result is as Figure 4 As shown, the adsorption rate was faster before 10 min, then the adsorption rate began to decrease, and finally reached equilibrium at about 36 h, and the adsorption amount at equilibrium was 31.2 mg / g.

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Abstract

The invention belongs to the field of environmental functional materials and biomass resource utilization, and particularly relates to a method for preparing a cubic spinel type Mn / Al oxide-sludge biochar material by a one-step hydrothermal process, and application of the cubic spinel type Mn / Al oxide-sludge biochar material. The method includes the following steps: (1) adding sludge into deionized water to uniformly disperse the sludge in a solution; (2) dissolving manganese chloride and aluminum chloride in the solution containing sludge powder, continuing to stir, and dropwise adding NaOH to the mixed solution during stirring; (3) transferring the mixed solution into a stainless steel hydrothermal reaction kettle for reaction; (4) performing natural cooling after reaction, washing sediments, obtained by filtration, with the deionized water to neutrality, and drying the sediments to obtain the cubic spinel type Mn / Al oxide-sludge biochar material. The method has the advantages of simple process, stable source and low cost of raw materials for preparation, and the like, and provides a new approach for sludge recycling; a new phosphorus adsorbent with good environmental and socialeffects is provided.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and biomass resource utilization, and specifically relates to a cubic spinel-type Mn / Al oxygen body-sludge biochar material and a preparation method and application thereof. Background technique [0002] With the development of urbanization and the unprecedented growth of population, the discharge of a large amount of phosphorus-containing wastewater has made the eutrophication of water body more and more serious, resulting in the imbalance of species distribution in aquatic ecosystems, causing algal blooms and fish death. Therefore, there is an urgent need to develop an efficient and environmentally friendly method for phosphorus removal from water bodies. [0003] In recent years, biochar, as a new type of biomass adsorption material, has attracted the attention of researchers at home and abroad. Biochar is a porous carbon-containing material prepared by anoxic pyrolysis carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/08B01J20/20C02F1/288C02F2101/105
Inventor 彭广飞王利平蒋善庆张秋亚曹宇
Owner CHANGZHOU UNIV
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