Lignin grafted polyamino acid type heavy metal adsorbent as well as preparation method and application thereof

A polyamino acid and lignin technology, applied in separation methods, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of inability to adsorb heavy metal cations, waste of resources, poor repeatability of adsorbents, etc. The effect of short recovery and removal time and mild adsorption treatment conditions

Inactive Publication Date: 2021-06-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in Chinese invention application CN 110479217, lignin is modified based on metal doping for selective adsorption of As(V) anion HAsO in water 4 2- , but this method is only suitable for the adsorption of oxygen-containing anions, and the adsorption condition is only at pH=7, and heavy metal cations cannot be adsorbed under this pH condition
In addition, Chinese invention applicat

Method used

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  • Lignin grafted polyamino acid type heavy metal adsorbent as well as preparation method and application thereof
  • Lignin grafted polyamino acid type heavy metal adsorbent as well as preparation method and application thereof
  • Lignin grafted polyamino acid type heavy metal adsorbent as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0060] Step 1: Add 5g of lignin powder into water to prepare an aqueous solution with a mass fraction of 30%, add 0.2mol / L NaOH aqueous solution to adjust the pH to 12.0, and stir at the same time to completely dissolve the lignin. Add polylysine (2.5g, embodiment 1) and polyaspartic acid (4g, embodiment 2) respectively in the round bottom flask then, drop 2.5g of 37wt% formaldehyde solution in 20 minutes, be warming up to Reaction at 70°C for 3 hours; after the reaction, the reaction solution was subjected to nanofiltration with a nanofiltration membrane with a molecular weight cut-off of 1000 Da, and the pH at the end point of the nanofiltration was 5 to 7, and the concentrated solution after nanofiltration was freeze-dried to obtain polylysine respectively The N contents of modified lignin (AL-PL) and polyaspartic acid modified lignin (AL-PC) were 10.24% and 8.76% respectively according to elemental analysis. .

[0061] Step 2: Using AL-PL and AL-PC synthesized in Step 1 a...

Embodiment 3～4

[0074] Step 1: 5g of lignin powder was added into water to form an aqueous solution with a mass fraction of 25%, and 0.1mol / L NaOH aqueous solution was added to adjust the pH to 11.0, while stirring to completely dissolve lignin. Add polyglutamic acid (5g, embodiment 3) and polyarginine (7.5g, embodiment 4) respectively in the round-bottomed flask then, in 20min, 2.5g dropwise addition of 37wt% glyoxal solution finishes, is warming up to React at 60°C for 3 hours; after the reaction, the reaction solution is nanofiltered with a nanofiltration membrane with a molecular weight cut-off of 1000Da, and the pH at the end point of the nanofiltration is 5-7. The concentrated solution after nanofiltration is freeze-dried to obtain polyglutamic acid Natural lignin (AL-PG) and polyarginine-modified lignin (AL-PS), the N content of which was 6.21% and 8.32% by elemental analysis.

[0075] Step 2: Use AL-PG and AL-PS synthesized in Step 1 as adsorbents to adsorb and treat metal ions in the...

Embodiment 5～6

[0083]Step 1: 5g of lignin powder was added into water to form an aqueous solution with a mass fraction of 20%, and 0.4mol / L NaOH aqueous solution was added to adjust the pH to 11.0 while stirring to completely dissolve lignin. Add polyhistidine (6g, embodiment 5) and polyglycine (3g, embodiment 6) respectively in the round-bottomed flask then, in 20min, 2.5g of 37wt% glutaraldehyde solution is added dropwise, be warming up to 60 ℃ of reaction 2h; After the reaction, the reaction solution is nanofiltered with a nanofiltration membrane with a molecular weight cut-off of 1000Da, and the pH of the nanofiltration end point is 5-7. The concentrated solution after nanofiltration is freeze-dried to obtain polyhistidine-modified lignin (AL-PH) and polyglycine modified lignin (AL-PA), wherein the elemental analysis test its N content was 16.10% and 9.65%, respectively.

[0084] Step 2: Use AL-PH or AL-PA synthesized in Step 1 as an adsorbent to adsorb and treat metal ions in water. Th...

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Abstract

The invention discloses a lignin grafted polyamino acid type heavy metal adsorbent and a preparation method and application thereof.The adsorbent is stable in structure, adsorption-desorption can be conducted for multiple times, metal recovery and repeated utilization of the adsorbent are facilitated, and meanwhile lignin and polyamino acid have the advantages of being safe, non-toxic, green, environmentally friendly and the like; and the lignin grafted polyamino acid type heavy metal adsorbent has good economic and environmental benefits.

Description

technical field [0001] The invention relates to the field of natural polymer adsorbents, in particular to a lignin-grafted polyamino acid type heavy metal adsorbent and its preparation method and application. Background technique [0002] Environmental problems are very serious problems that have emerged in recent years, and wastewater polluted by heavy metals is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans, animals and plants. In the past few decades, water pollution has become a serious problem due to the high toxicity, carcinogenicity, and nondegradability of heavy metal ions. Toxic heavy metals such as lead, cadmium, chromium, arsenic, zinc, copper, and nickel are harmful to aquatic organisms, and most of the heavy metal ions have carcinogenic, teratogenic, and mutagenic effects, and are easy to accumulate in organisms and pass through the food chain. The amplification is ultimately harmful to the human body...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01J20/34C08H7/00C08G81/00C02F1/28C02F101/20
CPCB01J20/24B01J20/3475C02F1/286C08H6/00C08G81/00B01J2220/4825B01J2220/4812C02F2101/20
Inventor 应汉杰蔺熙珃朱晨杰沈涛黎明晖庄伟李明胡瑞佳
Owner NANJING UNIV OF TECH
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