Preparation of nano-lanthanum hydroxide composite material and method for removing trace phosphorus in waste water

A technology of lanthanum hydroxide and composite materials, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problem of low utilization rate of high-activity nanometer lanthanum hydroxide, pore blockage, and low phosphate mass transfer rate. and other problems, to achieve the effect of excellent adsorption selection performance, promotion of dispersion and activity, and obvious environmental protection benefits

Active Publication Date: 2018-05-04
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of technology has obvious technical defects: (1) The loading of nanoparticles into porous materials often causes pore blockage, resulting in low phosphate mass transfer rate and low utilization rate of highly active nano-lanthanum hydroxide; (2) loading of nano-hydrogen Lanthanum oxide is often easy to agglomerate, so the unique high activity characteristics of nanoparticles are missing. How to realize the efficient utilization of nanoparticles in this kind of composite materials is a key problem to be solved urgently
However, due to the influence of organic-inorganic wettability and compatibility, highly dispersed nano-lanthanum hydroxide cannot be coated on the surface. This idea has obvious technical difficulties in preparation technology.

Method used

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  • Preparation of nano-lanthanum hydroxide composite material and method for removing trace phosphorus in waste water
  • Preparation of nano-lanthanum hydroxide composite material and method for removing trace phosphorus in waste water
  • Preparation of nano-lanthanum hydroxide composite material and method for removing trace phosphorus in waste water

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Experimental program
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Effect test

Embodiment 1

[0026] Measure 50mL of D201 resin (produced by Hangzhou Zhengguang Industrial Co., Ltd., the same below) as the initial reaction substance, first place it in a Tris-HCl buffer solution with a mass fraction of 1g / L and a pH of 7.5, and control the temperature at 20 ℃, after 12 hours of aeration reaction, filter to obtain the macroporous polymeric sphere mother plate material coated with polydopamine, use 20mL of the polymeric sphere as a carrier, place it in 40mL containing 1% La(III) (calculated as lanthanum mass fraction , lanthanum nitrate as the precursor) in an aqueous solution at 50°C for 6 hours to fully diffuse the lanthanum salt to the inner surface of the polymerization sphere, filter, then place 40 mL of ammonia water with a mass fraction of 1%, fully stir the reaction at 50°C for 12 hours, and filter , the above materials were fixed in a vacuum oven at 60° C. for 4 hours to obtain the target resin-based polydopamine nano-lanthanum hydroxide composite material, and th...

Embodiment 2

[0035] Take 50mL of D201 resin (produced by Hangzhou Zhengguang Industrial Co., Ltd., the same below) as the initial reaction substance, first place it in a Tris-HCl buffer solution with a mass fraction of 2.2g / L and a pH of 8.5, and control the temperature at 30°C, aerated for 24 hours and then filtered to obtain a macroporous polymeric sphere mother plate material coated with polydopamine. With 30mL of the polymeric sphere as a carrier, it was placed in 300mL containing 10% La(III) (calculated as the mass fraction of lanthanum) , lanthanum chloride as the precursor) in an aqueous solution at 60°C for 8 hours to fully diffuse the lanthanum salt to the inner surface of the polymeric sphere channel, filter, then dropwise add 150mL of ammonia water with a mass fraction of 4%, fully stir the reaction at 60°C for 24h, filter , the above materials were fixed in a vacuum oven at 80° C. for 8 hours to obtain the target resin-based polydopamine nano-lanthanum hydroxide composite materi...

Embodiment 3

[0038] Measure 30mL of 201x7 resin (produced by Hangzhou Zhengguang Industrial Co., Ltd.) as the starting reaction substance, first place it in a Tris-HCl buffer solution with a mass fraction of 1.8g / L and a pH of 8.2, and control the temperature at 25°C. Aerated for 16 hours and then filtered to obtain a macroporous polymeric sphere mother plate material coated with polydopamine, with 20mL of the polymeric sphere as a carrier, it was placed in 100mL containing 3% La(III) (calculated as lanthanum mass fraction, lanthanum nitrate (precursor) in an aqueous solution at 50°C for 7 hours to fully diffuse the lanthanum salt to the inner surface of the polymeric sphere pores, filter, then dropwise add 85 mL of ammonia water with a mass fraction of 2%, fully stir the reaction at 55°C for 18 hours, filter, and dissolve the above materials Place in a vacuum oven at 70° C. for 6 hours to obtain the target resin-based polydopamine nano-lanthanum hydroxide composite material, with a loading...

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Abstract

The invention discloses a preparation method of a nano-lanthanum hydroxide composite material, mainly comprising the following steps: putting macroporous ion exchange resin into a Tris-HCl buffer solution, reacting to obtain a macroporous polystyrene matrix material of which the surface is coated with polydopamine, filtering, putting into an La (III) salt solution, diffusing lanthanum salt to theouter surface of a sphere, and performing ammonium hydroxide in-situ precipitation to obtain the nano-lanthanum hydroxide composite material of which the loading amount is 5.9 to 35.2 percent. A method for removing trace phosphorus in waste water by using the composite material comprises the following steps: filling an adsorption column with the composite resin, then enabling trace phosphate infected water to directly flow through a filter column with an adsorbent from top to bottom, and when the concentration of phosphate in effluent is higher than 0.5mg / L, desorbing by using mixed liquor ofNaOH and NaCl and effectively regenerating. The treatment efficiency is high, the treatment capacity is great, the environmental protection benefit is obvious, and the content of the phosphate in theeffluent of the phosphate-infected waste water can be lowered to 50ppb or less.

Description

technical field [0001] The invention relates to a wastewater purification method. Background technique [0002] Phosphorus is one of the main elements that lead to eutrophication in water bodies. Discharge of large amounts of phosphorus-containing wastewater into water bodies can lead to severe eutrophication, and the algae toxins produced may have a lethal effect on drinking water. The survey shows that the maximum acceptable phosphorus concentration in lakes is 0.03mg / L. Therefore, the efficient purification treatment technology for trace phosphorus in water has important practical application value. The latest phosphorus discharge standard requires total P<0.5ppm. With the increasing environmental protection requirements, wastewater treatment is becoming more and more difficult. Common phosphorus removal methods include chemical precipitation, biological method, ion exchange method, adsorption method and membrane separation method. The chemical precipitation method i...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/261B01J20/262C02F1/281C02F1/285C02F2101/105
Inventor 张庆瑞李奕璇孙奇娜杨庆刚陈贺
Owner YANSHAN UNIV
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