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Method for removing phosphorus in water body by using adsorption of nano-lanthanum oxide modified alkali lignin

A technology of nanometer lanthanum oxide and alkali lignin is applied in the field of alkali lignin material adsorption and removal of orthophosphate in water to achieve the effects of improving adsorption effect, increasing temperature and improving adsorption effect.

Active Publication Date: 2018-07-31
TAIZHOU UNIV
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  • Abstract
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Problems solved by technology

[0006] Alkali lignin is modified by lanthanum oxide and applied to the adsorption and removal of phosphorus in water bodies, but there are no related reports so far

Method used

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  • Method for removing phosphorus in water body by using adsorption of nano-lanthanum oxide modified alkali lignin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The method for removing phosphorus in water by adsorption of alkali lignin modified by nanometer lanthanum oxide comprises the following steps:

[0038] Step 1. Dissolve 5.0g alkali lignin in 100mL aqueous solution, add 4.0g polyethyleneimine (PEI, 99wt.%) and 4.0g formaldehyde (37wt.%) solution, get 20wt.% sodium hydroxide solution to adjust pH to 10.0-11.0, stir evenly, heat up to 50°C, react for 24h, filter with suction, wash several times until neutral, vacuum dry at 60°C to constant weight, and obtain alkali lignin grafted polyethyleneimine, denoted as AL- PEI.

[0039]Step 2. Add 2.0g AL-PEI to the mixed solution of 100mL absolute ethanol and distilled water (v / v=1:4), add 3.71g lanthanum chloride heptahydrate, and take 20wt.% sodium hydroxide solution Adjust the pH to 10.0-11.0, react at 60°C for 3 hours, and continue to react at room temperature for 24 hours. After cooling, the reaction product is fully washed with water and dried in vacuum to obtain nano-lanth...

Embodiment 4

[0047] The preparation of the alkali lignin adsorbent modified by nanometer lanthanum oxide comprises the following steps:

[0048] Step 1. Dissolve 5.0g alkali lignin in 100mL aqueous solution, add 5.0g polyethyleneimine (PEI, M.W.10000, 99wt.%) and 5.0g formaldehyde (37wt.%) aqueous solution, get 20wt.% of hydroxide Adjust the pH of the sodium solution to 10.0-11.0, stir evenly, then heat up to 50°C, react for 24 hours, filter with suction, wash several times until neutral, and vacuum-dry at 60°C to constant weight to obtain alkali lignin grafted polyethyleneimine, record Make AL-PEI.

[0049] Step 2. Add 2.0g AL-PEI to the mixed solution of 100mL absolute ethanol and distilled water (v / v=1:4), add 4.90g lanthanum chloride heptahydrate, and take 20wt.% sodium hydroxide solution Adjust the pH to 10.0-11.0, react at 60°C for 3 hours, and continue to react at room temperature for 24 hours. After cooling, the reaction product is fully washed with water and dried in vacuum to ob...

Embodiment 5

[0051] The alkali lignin AL-PEI-La modified by nano-lanthanum oxide synthesized in Example 1 was used as an adsorbent to adsorb and treat phosphorus-containing water. The initial concentration of phosphorus was 46.72mg P / L, and other adsorption conditions were the same as in Example 1. The variation law of adsorption amount with adsorption time was studied. The experimental results showed that the time for adsorption to reach equilibrium was 60min, and the equilibrium adsorption amount was 37.28mg P / g.

[0052] It can be seen that compared with the time for other adsorbents reported in the literature to reach adsorption equilibrium (ACF-LaFe (120min) (Chemical Engineering Journal, 2013, 215-216, 859-867.), ACF-LaOH (360min) (Chemical Engineering Journal, 2012 ,185–186,160-167.), MFC@La(OH)(240min)(Chemical Engineering Journal,2018,335,443-449.), Lanthanum-supported ordered mesoporous hollow silicon spheres (1440min)(Journal of Materials Chemistry A ,2014,2,8839-8848.)), the ad...

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Abstract

The invention discloses a method for removing phosphorus in a water body by using adsorption of nano-lanthanum oxide modified alkali lignin. The method comprises the following steps: dissolving the alkali lignin into water, adding polyethylenimine and a formaldehyde solution and carrying out a Mannich reaction in an alkaline environment; carrying out a hydrothermal reaction of a product by adopting lanthanum chloride as a lanthanum source in an ethanol aqueous solution to prepare the nano-lanthanum oxide modified alkali lignin; adding the nano-lanthanum oxide modified alkali lignin into a phosphorous-containing water body and removing the phosphorus in the water body by adsorbing. The surface of the lanthanum oxide modified alkali lignin prepared according to the hydrothermal method has highly-dispersed active lanthanum adsorption sites, and shows excellent removal effect and higher cyclic utilization rate for the phosphorus; in addition, the adsorption time is short and the treatmentefficiency is high; the adopted alkali lignin as a base body material is waste residue of a papermaking pulping process, and is wide in source and low in price, so that the aim of treating the wastesby wastes can be realized. The method for removing the phosphorus in the water body by using adsorption of the nano-lanthanum oxide modified alkali lignin, disclosed by the invention, has good economic and environmental benefits when being applied to removal of the phosphorus in the water body.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for removing orthophosphate in a water body, in particular to a method for removing orthophosphate in water by adsorption of an alkali lignin material modified by nanometer lanthanum oxide. Background technique [0002] Phosphorus is one of the limiting nutrients that cause eutrophication of various surface water bodies. Excessive discharge of phosphorus, on the one hand, poses a great threat to water quality safety and aquatic organisms, and on the other hand, aggravates the shortage of non-renewable phosphorus resources. Phosphorus exists in three main forms in natural water bodies and wastewater, namely orthophosphate, polyphosphate (including pyrophosphate, metaphosphate and polyphosphate) and organically bound phosphate. These three forms of phosphorus have a certain conversion effect. Polyphosphate can be hydrolyzed into orthophosphate under acidic condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/24B01J20/30
CPCB01J20/24B01J20/3085B01J2220/4837C02F1/286C02F2101/105
Inventor 宗恩敏刘晓欢宋平安沈梦月廖显军蒋胜韬
Owner TAIZHOU UNIV
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