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Composite material for efficiently passivating sediment phosphorus and preparation method thereof

A composite material and deposit technology, which is applied in the field of composite materials for high-efficiency passivation of sediment phosphorus and its preparation, can solve the problems of increased preparation cost, low phosphorus adsorption capacity, etc., and achieves good control effect, large adsorption capacity, and preparation method. Simple and easy effects

Pending Publication Date: 2022-06-28
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphorus adsorption capacity of modified natural mineral materials is still low, and often requires high heat treatment or high acid-base treatment, which increases the cost of material preparation.

Method used

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  • Composite material for efficiently passivating sediment phosphorus and preparation method thereof
  • Composite material for efficiently passivating sediment phosphorus and preparation method thereof
  • Composite material for efficiently passivating sediment phosphorus and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] Example 1: The CaCl 2 (5g) and AlCl 3 ·6H 2O (5 g) was dissolved in 100 mL of deionized water at 60°C in turn, and then NaOH solutions (5M and 1M) were slowly added to the above solution successively to adjust the pH of the solution to a stable pH of 9.0. The solution was then placed on a constant temperature water bath for co-precipitation and crystallization at 60°C for 24 hours. The precipitate was collected by centrifugation, dried in a blast drying oven at about 60°C to constant weight, and ground to obtain a Ca / Al composite material. Take some 25 mL of potassium dihydrogen phosphate aqueous solution with a phosphorus concentration (calculated as phosphorus element, the same below) of 70 mg / L, and adjust with hydrochloric acid (1M) and NaOH (1M) solutions to initial pH values ​​of 4, 5, 6, and 7, respectively. , 8, 9, 10, 11. 0.01 g of each Ca / Al composite material was added to the above-mentioned potassium dihydrogen phosphate aqueous solution with different p...

Embodiment 2

[0031] Example 2: LaCl 3 ·7H 2 O(0.25g), CaCl 2 (4.75g) and AlCl 3 ·6H 2 O (5 g) was sequentially dissolved in 100 mL of deionized water at 60°C, and then NaOH (5 M and 1 M) solutions were slowly added to the above solution successively to reach a stable pH of 9.0. The pH-adjusted solution was placed on a constant temperature water tank for co-precipitation and crystallization at 60°C for 24 hours. The precipitate was collected by centrifugation, dried in a blast drying oven at 60°C to constant weight, and ground to obtain La / Ca / Al composite material. Take some 25 mL of potassium dihydrogen phosphate aqueous solution with a phosphorus concentration of 70 mg / L, and adjust with hydrochloric acid (1 M) and NaOH (1 M) solutions to the initial pH values ​​of 4, 5, 6, 7, 8, 9, 10, and 11, respectively. 0.01 g of each La / Ca / Al composite material was added to the above potassium dihydrogen phosphate aqueous solution with different pH values, and then shaken at 150 rpm and 25 °C f...

Embodiment 3

[0032] Example 3: collecting the sediments of Miaohu Lake, Zihu, Donghu Lake, naturally air-drying, grinding and sieving to obtain the original Donghu Lake sediments, for use. Take the Ca / Al composite material 4g in the above-mentioned embodiment 1 and the La / Ca / Al composite material 4g in the embodiment 2 with a mass ratio of 4% (dry weight ratio) and each was added to 96g of the dry sediments of Donghu Zihu and Miaohu Lake. , after thorough mixing, grinding and sieving (100 mesh), the Donghu Lake sediments corrected by 4% Ca / Al composite materials and the Dong Lake sediments corrected by 4% La / Ca / Al composite materials were obtained. Take 0.20 g of original Donghu sediments, 4% Ca / Al composite-corrected Donghu sediments, and 4% La / Ca / Al composite-corrected Donghu sediments into 50 ml polyethylene tubes, and then add 20 ml of initial sediments. A series of high-concentration phosphate solutions with a pH of 7.0 (phosphorus concentrations of 1, 2, 4, 10, 20, 50, and 80 mg / L, r...

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Abstract

The invention belongs to the technical field of water body sediment restoration, and particularly relates to a composite material for efficiently passivating sediment phosphorus and a preparation method of the composite material. The preparation method of the composite material comprises the following steps: mixing LaCl3. 7H2O, CaCl2 and AlCl3. 6H2O, adding into water, heating in a water bath under an alkaline condition for co-precipitation and crystallization, collecting the precipitate, and drying to obtain the precipitate phosphorus passivation material Ca / Al or La / Ca / Al composite material. The Ca / Al and La / Ca / Al composite materials prepared by the method can adapt to a larger pH value range in eutrophicated lakes, and keep a high sediment phosphorus passivation effect in acidic, neutral and alkaline lake water. In addition, the phosphorus passivation effect of Ca / Al and La / Ca / Al is very effective in anaerobic and aerobic environments, and can cope with various frequently changing oxidation-reduction environments in lakes.

Description

technical field [0001] The invention belongs to the technical field of water sediment restoration, and in particular relates to a composite material for efficiently passivating sediment phosphorus and a preparation method thereof. Background technique [0002] Phosphorus (P) has been shown to be a major limiting factor in most lakes and rivers, and its excessive input is likely to lead to eutrophication of water bodies. In lakes with heavier endogenous loads, even if exogenous phosphorus input is completely cut off, the phosphorus release from sediments is sufficient to sustain sustained outbreaks of harmful algal blooms. Therefore, inhibiting the release of phosphorus from sediments is one of the keys to long-term control of lake eutrophication after sustained reduction of exogenous phosphorus loads. [0003] Phosphorus adsorbents of metal salts and metal-based solid-phase products are considered as an effective method for sediment remediation. So far, many materials base...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/30C02F11/00C02F101/10
CPCB01J20/04B01J20/0248B01J20/0207C02F11/00C02F11/004C02F2103/007C02F2101/105Y02W10/10
Inventor 张胜花严瑾张峰瑞方江林
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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