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A kind of porous biomass carbon-based phosphate adsorbent and its preparation method and application

A carbon-based phosphate and biomass technology, applied in the field of phosphate adsorption, can solve the problems of high pH value, less biomass-based adsorbents, and high chemical oxygen demand, and achieve large adsorption capacity, wide pH value range, and high adsorption capacity. fast effect

Active Publication Date: 2022-02-22
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since black liquor has high pH, ​​high COD and contains many impurities, it can cause many environmental problems if not handled properly
At present, the research on the recovery of black liquor mainly focuses on the use of black liquor as a fuel source, battery material or catalyst support, and there is very little research on the use of black liquor to prepare biomass-based adsorbents

Method used

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  • A kind of porous biomass carbon-based phosphate adsorbent and its preparation method and application
  • A kind of porous biomass carbon-based phosphate adsorbent and its preparation method and application
  • A kind of porous biomass carbon-based phosphate adsorbent and its preparation method and application

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preparation example Construction

[0031] The invention provides a kind of preparation method of porous biomass carbon-based phosphate adsorbent, comprising the following steps:

[0032] The calcium hydroxide-treated biomass black liquor is evaporated to dryness and then calcined to obtain a porous biomass carbon-based phosphate adsorbent.

[0033] In the present invention, the calcium hydroxide treated biomass black liquor is specifically the waste liquor generated after the biomass is treated with calcium hydroxide; the calcium hydroxide treated biomass black liquor includes calcium hydroxide, lignin, Substances such as hemicellulose and soluble salt ions.

[0034] In the present invention, the calcium hydroxide treated biomass dark night is preferably prepared by a method comprising the following steps:

[0035] The biomass powder, calcium hydroxide and water are mixed and then centrifuged, and the upper black suspension is collected to obtain calcium hydroxide-treated biomass black liquor.

[0036] In the...

Embodiment 1

[0048] Rice straw was air-dried, chopped, ground with a grinder, and sieved through a 40-mesh (0.425 mm) stainless steel sieve to obtain straw powder of uniform size, and then 10 g of Ca(OH) 2 and 10 g of rice straw powder were sequentially poured into 100 mL of distilled water, and stirred gently at room temperature (25 °C) for 4 h. After stirring, the mixture was centrifuged at 5000 rpm, the upper black suspension was collected, and placed in an oven and evaporated to dryness at 80°C; the evaporated solid was transferred to a corundum boat and placed in a programmable tube furnace in N 2 Protected and heated to 800°C at a heating rate of 5°C / min, and calcined at 800°C for 2h. After the furnace was cooled to room temperature, the biochar derived from black liquor was finally obtained, which is the porous biomass charcoal-based phosphate adsorbent, denoted as CaBLC.

[0049] Physical properties and chemical composition testing:

[0050] The specific surface area, pore volum...

Embodiment 2

[0067] The 100 mg / L phosphorus solution was adjusted to different initial pH values ​​(1, 3, 5, 7, 9, 11, 13) using 0.1 M NaOH and HCl solutions. Weigh 10 mg of the CaBLC adsorbent prepared in Example 1 and pour them into 40 ml of the above-mentioned phosphorus solutions with different pHs. After shaking the mixture at 25° C. for 24 h, filter and measure the phosphorus concentration and final pH in the filtrate.

[0068] The result is as Figure 6 shown; according to Figure 6 It can be seen that when the pH of the reaction system is 1 and 3, the phosphorus adsorption capacity of CaBLC is 107.5 mg / g and 136.3 mg / g respectively; when the pH increases to 5-13, the adsorption capacity increases to 184.3-205.7 mg / g g; It can be seen that as the pH of the reaction system increases, the phosphorus adsorption capacity of CaBLC increases, and in a wide pH range, CaBLC has a high adsorption capacity for phosphate, which has great potential in practical applications. potential.

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Abstract

The invention relates to the technical field of phosphate adsorption, and provides a porous biomass carbon-based phosphate adsorbent as well as a preparation method and application thereof. In the invention, the calcium hydroxide-treated biomass black liquor is evaporated to dryness and then calcined to obtain a porous biomass carbon-based phosphate adsorbent. The preparation method provided by the invention is simple, green and environmentally friendly, and can realize resource utilization of waste pollutant calcium hydroxide to treat biomass black liquor; and the obtained porous biomass carbon-based phosphate adsorbent has a large adsorption capacity and a wide range of applicable pH values. The adsorption rate is fast and it is not easily affected by other anions in the solution. The results of the examples show that the porous biomass charcoal-based phosphate adsorbent provided by the present invention adsorbs phosphate, and when the initial concentration of phosphorus is 2mg / L, the phosphorus removal rate within 2min can reach more than 98.6%, and the present invention The highest phosphate adsorption capacity of the inventive adsorbent can reach 210.7mg / g.

Description

technical field [0001] The invention relates to the technical field of phosphate adsorption, in particular to a porous biomass charcoal-based phosphate adsorbent and its preparation method and application. Background technique [0002] Phosphorus is one of the key nutrients for plant and animal growth and reproduction. However, when the phosphorus content in water is too high, harmful algae can be produced in large quantities, reducing water quality and increasing the cost of water treatment. At the same time, this type of algae can produce large amounts of cyanotoxins, increasing health risks and causing odor nuisance to neighboring communities. Various countries have strict requirements on the phosphorus content in wastewater. China's phosphorus discharge standard is 0.5mg / L (GB18918-2002), and the US discharge standard is 50μg / L. Therefore, the scientific and effective control of phosphorus content in wastewater is an important part of rational environmental management...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/20B01J20/041C02F1/283B01J2220/4825B01J2220/4806C02F2101/105
Inventor 漆新华刘小宁申锋
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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