Soil heavy metal stabilizer functioning as nitrogen and phosphorus fertilizer, and preparation method and application thereof

A heavy metal stabilizer, nitrogen and phosphorus fertilizer technology, applied in the restoration of polluted soil, application, nitrogen fertilizer, etc., can solve the problems of unfavorable secondary agricultural development and utilization of soil, lower fertility level, etc., to achieve enhanced dimensional resistance and electrostatic repulsion, physical and chemical The effect of small property influence and high reactivity

Active Publication Date: 2020-09-04
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Relevant studies have paid more attention to the stability modification of the inorganic passivator FeS to make it more efficient in passivating heavy metals. However, the application of a large amount of inorganic passivators will have a certain impact on the physical properties of the soil, resulting in the overall fertility level of the soil. Therefore, the repaired soil is not conducive to subsequent cultivation or secondary agricultural development and utilization. Therefore, it is very important to explore and develop a stabilizer that can reduce FeS agglomeration and enhance soil fertility.

Method used

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  • Soil heavy metal stabilizer functioning as nitrogen and phosphorus fertilizer, and preparation method and application thereof
  • Soil heavy metal stabilizer functioning as nitrogen and phosphorus fertilizer, and preparation method and application thereof
  • Soil heavy metal stabilizer functioning as nitrogen and phosphorus fertilizer, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Example 1: Preparation of a soil improvement and restoration agent for heavy metal polluted soil

[0024] In the present embodiment, organic matter is sodium phytate (PADSH), and configuration mass percentage composition is the sodium phytate solution of 1%; Ferrous ammonium sulfate (((NH 4 ) 2 Fe(SO 4 ) 2 ) solution concentration is 5mol / L; sodium sulfide (Na 2 S) concentration is 10mol / L.

[0025] Under normal temperature and anaerobic conditions, slowly add sodium sulfide solution dropwise to the solution containing organic matter and ferrous ammonium sulfate, the volume ratio of sodium phytate solution: ferrous ammonium sulfate solution: sodium sulfide solution is 10:2:1, side drop Stir while stirring, and carry out ultrasonic dispersion at the same time. The ultrasonic frequency is 60kHZ. After 20 minutes of reaction, an organic matter-ferrous sulfide nanoparticle suspension is obtained, which is a heavy metal stabilizer for heavy metal polluted soil.

[0026]...

Embodiment 2

[0030] Embodiment 2: Preparation of a soil improvement and restoration agent for heavy metal polluted soil

[0031] In the present embodiment, the organic matter is aminotrimethylene phosphonate (ATMP), and configuration mass percent composition is the aminotrimethylene phosphonate solution of 2%; Ferrous ammonium sulfate (((NH 4 ) 2 Fe(SO 4 ) 2 ) solution concentration is 4mol / L; sodium sulfide (Na 2 S) concentration is 8mol / L.

[0032] Under normal temperature and anaerobic conditions, slowly add sodium sulfide solution dropwise to the solution containing organic matter and ferrous ammonium sulfate, ATMP:(NH 4 ) 2 Fe(SO 4 ) 2 :Na 2 The volume ratio of S is 10:2:1, stirring (300rpm) while adding dropwise, and ultrasonic dispersion is carried out at the same time. The ultrasonic frequency is 50kHZ. After 15 minutes of reaction, the organic matter-ferrous sulfide nanoparticle suspension is obtained, which is the heavy metal contaminated soil. Heavy metal stabilizer.

...

Embodiment 3

[0037] Embodiment 3: a kind of soil improvement repairing agent preparation for heavy metal polluted soil

[0038] In the present embodiment, the organic matter is hydroxymethylene phosphonate (HEDP), and the configuration mass percentage is 2.5% hydroxymethylene phosphonate solution; ferrous ammonium sulfate (((NH 4 ) 2 Fe(SO 4 ) 2 ) solution concentration is 4.5mol / L; sodium sulfide (Na 2 S) concentration is 9mol / L.

[0039] Under normal temperature anaerobic conditions, slowly add sodium sulfide solution dropwise to the solution containing organic matter and ferrous ammonium sulfate, hydroxymethylene phosphonate solution: ferrous ammonium sulfate solution: sodium sulfide solution volume ratio is 10:2: 1. Stir (300rpm) while adding dropwise, and carry out ultrasonic dispersion at the same time. The ultrasonic frequency is 40kHZ. After 30 minutes of reaction, the organic matter-ferrous sulfide nanoparticle suspension is obtained, which is the heavy metal stabilizer for he...

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Abstract

The invention discloses a soil heavy metal stabilizer functioning as a nitrogen and phosphorus fertilizer, and a preparation method and application thereof. The soil heavy metal stabilizer is an organic matter-ferrous sulfide nanoparticle suspension; the mass percentage concentration of the organic matter is 0.05-5%, and the organic matter is one or more selected from a group consisting of sodiumphytate, 1-hydroxyethylidene-1,1-diphosphonic acid tetrasodium salt, amino trimethylene phosphonate, ethylenediamine tetramethylene phosphonate and 1-hydroxymethylene phosphonate; and the particle sizes of ferrous sulfide nanoparticles are in a range of 250 to 500 nm. The soil heavy metal stabilizer can passivate and fix various heavy metal ions such as chromium, arsenic, lead and zinc in soil atthe same time, increases the content of organic matters in the soil, provide nutrient elements N and P needed by plant growth and improve soil fertility, and has potential application and popularization value.

Description

technical field [0001] The invention relates to a soil repair preparation, in particular to a soil heavy metal stabilizer with the function of nitrogen and phosphorus fertilizer, a preparation method and application. Background technique [0002] With the increasing mining, smelting, processing and commercial manufacturing activities of heavy metals, harmful heavy metals enter the soil through various channels, causing serious soil pollution. Soil heavy metal pollution will not only lead to soil degradation, affect the yield and quality of crops, but also can enter the human body through the food chain, endangering human health. Therefore, the control and remediation of soil heavy metal pollution has become particularly important. [0003] At present, the soil remediation methods of heavy metal pollution mainly adopt chemical method, physical method and biological method. Among them, stable curing technology is a relatively mature and cost-effective technology, which has t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/48B09C1/08C05G3/80C05G5/27C09K101/00
CPCB09C1/08C05B15/00C09K17/48C09K2101/00C05G3/80C05G5/27C05C3/00
Inventor 李时银阴俐米纳姚有如李晶何欢杨绍贵宋海欧
Owner NANJING NORMAL UNIVERSITY
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