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Manganese-loaded plant-based biochar and preparation method and application thereof

A plant-based, biochar technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of high cost, complicated preparation process of biochar, secondary pollution, etc., and achieve a simple and suitable preparation method. In large-scale popularization and application, the effect of simple preparation process

Active Publication Date: 2020-09-15
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned prior art, the present invention provides a manganese-loaded plant-based biochar and its preparation method and application to solve the problems of complex preparation process, high cost and easy secondary pollution of the existing manganese-loaded biochar

Method used

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  • Manganese-loaded plant-based biochar and preparation method and application thereof
  • Manganese-loaded plant-based biochar and preparation method and application thereof
  • Manganese-loaded plant-based biochar and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Planting pokeweed rich in manganese

[0031] Pokeweed seeds were collected from Jishou, Hunan. Potweed cultivation involves the following steps:

[0032] (1) Select plump and undamaged seeds, soak them in concentrated sulfuric acid for about 10 minutes, and then wash them with deionized water;

[0033] (2) Sow pokeweed seeds soaked in concentrated sulfuric acid on a plastic tray filled with sterilized vermiculite, and germinate in the dark at room temperature;

[0034] (3) After the cotyledons are fully expanded, the seedlings are gradually transferred to 25%, 50%, and 100% Hoagland solutions for cultivation;

[0035] (4) When the seedlings grow to four leaves and one heart, transplant them into non-polluted soil (collected from non-polluted soil in Jiangning District, Nanjing City), and use 5mM MnCl every 6 days or so in the early stage. 2 Water the solution once, and water about 4 times in total; after the plants survive, use 5mM MnCl every half a month ...

Embodiment 2

[0037] Example 2: Preparation of manganese-loaded plant-based biochar

[0038] The preparation method of the manganese-loaded plant-based biochar comprises the following steps:

[0039] S1: Collect the mature pokeweed plants in Example 1, wash them with deionized water, put them in an oven and dry them at a temperature of 50° C. (water content is less than 2%);

[0040] S2: The dried Pokeweed plant was crushed through a 60-mesh sieve, and the under-sieve was put into a muffle furnace, and calcined at a temperature of about 500°C for about 2 hours to obtain a plant-based biochar loaded with manganese, which was named PBC Mn 500.

[0041] Using the same method, Pokeweed planted with tap water was used to make biochar with low Mn content, named PBC500.

Embodiment 3

[0042] Embodiment three: the property analysis of biochar

[0043] The pH value of biochar was measured by a suspension system of 1:10; the content of metals and mineral elements in biochar was determined by microwave digestion method and inductively coupled plasma emission spectrometer; the morphological characteristics of biochar were determined by scanning electron microscopy; BET- The specific surface area (SSA) of biochar was measured by N2 analyzer.

[0044] After determination, PBC500 and PBC Mn The pH values ​​of PBC 500 were 12.1 and 9.8, respectively, indicating that pokeweed biochar was highly alkaline, while PBC Mn The high concentration of manganese oxide in 500 made the pH of biochar lower.

[0045] PBC500 and PBC Mn The metal and mineral element contents in 500 are listed in Table 1. It can be seen from the table that pokeweed biochar (PBC500) without Mn hyperaccumulation contains about 2.58mg / g Mn, which is because pokeweed absorbs Mn in the soil during the...

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Abstract

The invention discloses manganese-loaded plant-based biochar and a preparation method and application thereof. The loading capacity of Mn in the plant-based biochar is 25-30mg / g. The preparation method comprises the following steps: cultivating hyperaccumulators, and irrigating the hyperaccumulators with a manganese ion-containing solution in the growth process of the hyperaccumulators; harvestingmature plants, cleaning and drying; and crushing the dried plants, sieving with a 60-mesh sieve, and calcining at 480-550 DEG C for 1-4 hours to obtain the manganese-loaded plant-based biochar. The plant-based biochar can be used for adsorbing and curing heavy metal ions, and can be used for treating the environment polluted by heavy metals. The high-manganese-loaded plant-based charcoal is obtained through plant cultivation and calcination, exogenous loading treatment is not needed, the preparation process of the charcoal is simpler and more convenient, the risk of secondary pollution is reduced, and the charcoal is suitable for large-scale application and popularization.

Description

technical field [0001] The invention relates to a biochar, in particular to a plant-based biochar loaded with manganese, a preparation method and application thereof. Background technique [0002] Heavy metals cannot be biodegraded and have the characteristics of bioaccumulation and biomagnification, so they have always been the focus of global environmental pollution research. Due to the wide application in aquaculture and agriculture and the discharge of smelters, a large amount of Cd and Zn-containing wastewater is discharged into the environment, causing great harm to the ecological environment and accumulating in the human body through the food chain, endangering human health. Adsorption has the advantages of economy, high efficiency, and easy treatment, and has become a research hotspot at home and abroad, and is widely used in the removal of heavy metals in sewage. [0003] Biochar with high-efficiency adsorption capacity is an important material for environmental po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/3028C02F1/283B01J20/02C02F2101/20
Inventor 吴萍崔培昕王玉军
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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