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Preparation method of surface-modified pine needle-loaded lanthanum hydroxide adsorbent for phosphorus removal

A technology of lanthanum hydroxide and phosphorus adsorbents, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of difficult separation, difficult recovery, and easy aggregation of metal adsorbent particles, and achieve Facilitates loading and stabilization, improves soil conditions, reduces total organic matter content

Active Publication Date: 2019-03-22
WUXI XINDU ENVIRONMENTAL PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to load lanthanum hydroxide onto the surface of surface-modified pine needles to prepare a modified pine needle adsorbent that can be applied to actual water bodies. The shortcomings such as difficulty in recycling have realized the resource utilization of forestry by-products to a certain extent

Method used

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  • Preparation method of surface-modified pine needle-loaded lanthanum hydroxide adsorbent for phosphorus removal
  • Preparation method of surface-modified pine needle-loaded lanthanum hydroxide adsorbent for phosphorus removal
  • Preparation method of surface-modified pine needle-loaded lanthanum hydroxide adsorbent for phosphorus removal

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Effect test

Embodiment 1

[0022] The collected pine needles were washed 5 times with warm water, dried at 80°C for 12 h, crushed, ground and sieved, and 100 g of crushed pine needles with a length ranging from 1 to 2.5 mm were placed in 500 mL (V 1 M NaOH :V 异丙醇 =1:1) immerse in alkali-alcohol solution for 24 h. Wash with water until the test result of total organic matter in the supernatant becomes constant, and dry at 80°C for 12 h. Weigh 20 g of the treated pine needles, put into 200 mL 0.1 mol / L La(NO 3 ) 3 solution, and then add ammonia solution with a mass fraction of 28% drop by drop under stirring conditions, adjust the pH value of the solution between 8 and 9, and let it stand for 12 h. During this period, stir for 5 min every 3 h, and the stirring speed 5 revolutions / min, repeat the washing-draining cycle 5 times, and then dry at 80 °C for 12 h. The scanning electron microscope (SEM) images of the prepared adsorbents are shown in figure 1 , figure 2 .

Embodiment 2

[0024] The collected pine needles were washed 5 times with warm water, dried at 60°C for 12 hours, crushed, ground and sieved, and 200 grams of crushed pine needles with a length ranging from 1 to 2.5 mm were placed in 1000 mL (V 1 M NaOH :V 异丙醇 =1:1) immerse in alkali-alcohol solution for 24 h. Wash with water until the test result of total organic matter in the supernatant becomes constant, and dry at 60°C for 12 h. Weigh 40 g of the treated pine needles, put into 400 mL 0.1 mol / L La(NO 3 ) 3 solution, and then add ammonia solution with a mass fraction of 28% drop by drop under stirring conditions, adjust the pH value of the solution between 8 and 9, and let it stand for 12 h. During this period, stir for 5 min every 3 h, and the stirring speed 5 revolutions / min, repeat the washing-draining cycle 5 times, and then dry at 80 °C for 12 h.

Embodiment 3

[0026] The collected pine needles were washed 5 times with warm water, dried at 100°C for 12 hours, crushed, ground and sieved, and 200 grams of crushed pine needles with a length ranging from 1 to 2.5 mm were placed in 1000 mL (V 1 M NaOH :V 异丙醇 =1:1) immerse in alkali-alcohol solution for 24 h. Wash with water until the test result of total organic matter in the supernatant becomes constant, and dry at 100°C for 12 h. Weigh 20 g of the treated pine needles, put into 200 mL 0.1 mol / L La(NO 3 ) 3 solution, and then add ammonia solution with a mass fraction of 28% drop by drop under stirring conditions, adjust the pH value of the solution between 8 and 9, and let it stand for 12 h, during which, stir for 5 min every 3 h, and the stirring speed 5 revolutions / min, repeat the washing-draining cycle 5 times, and then dry at 80 °C for 12 h.

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Abstract

The invention discloses a preparation method of surface modified pine needle loaded lanthanum hydroxide phosphorus adsorbent. Surface modified pine needles serve as the carrying material, and surfaces of the pine needles are loaded with lanthanum hydroxide through the chemical deposit effect. According to the main preparation process, smashed pine needle cuticle is broken and organic substances in pine needle tissue structures are extracted through an alkali-alcohol mixed solution, and therefore the surfaces of pine needle tissue are loaded with lanthanum hydroxide through deposition. The phosphorus adsorbent is stable in phosphorus removal effect, convenient to recover and little in organic substance dissolution in the adsorption process; meanwhile, forestry by-products are utilized as resources, and quite good application prospects and environment benefits are achieved.

Description

technical field [0001] The invention belongs to the field of adsorption and dephosphorization of sewage and waste water and resource utilization, and in particular relates to a method for preparing a phosphate adsorption material by using surface-modified pine needles to load lanthanum hydroxide. Background technique [0002] At present, the environmental pollution of natural water bodies in the country is not optimistic, and the water environment pollution is still very serious. The main reason is the excessive enrichment of nutrients such as nitrogen and phosphorus in the water body. The advanced treatment of sewage and the prevention and control of eutrophication in water bodies have become urgent problems to be solved. important environmental issues. The commonly used phosphorus removal methods are chemical method and biological method. The former has high treatment costs and is prone to secondary pollution. The latter has poor operation stability and strict operation. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 罗振刘志东於恩洪吕子钧陈涛徐斌鑫
Owner WUXI XINDU ENVIRONMENTAL PROTECTION EQUIP
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