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Preparation method of modified sponge leather adsorbing heavy metal material

A technology for adsorbing heavy metals and modifying sponges, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption of water/sewage treatment, etc., to achieve the effects of strong practicability, difficult separation, and good selectivity

Inactive Publication Date: 2019-12-27
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the direct modification of waste leather and its application to the adsorption of heavy metal chromium in mining wastewater.

Method used

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  • Preparation method of modified sponge leather adsorbing heavy metal material
  • Preparation method of modified sponge leather adsorbing heavy metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a modified sponge leather material for absorbing heavy metals, comprising the following steps:

[0032] Step 1. Cut the waste leather into uniform square particles and soak them in ultrapure water for 48 hours, then wash them with ultrapure water for 2 to 3 times, and dry them in an oven at 40°C for 12 hours to obtain leather particles;

[0033] Step 2: Add 1 g of dried leather particles into 100 mL of sodium hydroxide solution with a concentration of 0.05 mol / L, then shake it at a constant temperature for alkali hydrolysis and activation for 60 minutes, filter, and wash repeatedly with water until the pH value of the filtrate is close to neutral , after filtering again, freeze in a vacuum freeze-drying box for 12 hours, and dry for 12 hours to obtain alkali hydrolyzed leather;

[0034] Step 3: Take 20mL of tannic acid solution with a concentration of 85% and 5g of alkali-hydrolyzed leather into a stainless steel reaction kettle with a polytetrafl...

Embodiment 2

[0037] A method for preparing a modified sponge leather material for absorbing heavy metals, comprising the following steps:

[0038] Step 1. Cut the discarded leather into uniform square particles and soak them in ultrapure water for 24 hours, then wash them with ultrapure water for 2 to 3 times, and dry them in an oven at 60°C for 24 hours to obtain leather particles;

[0039]Step 2: Take 1 g of dried leather particles and add it to 100 mL of sodium hydroxide solution with a concentration of 0.075 mol / L, then shake it at a constant temperature for alkali hydrolysis and activation for 30 minutes, filter, and wash repeatedly with water until the pH value of the filtrate is close to neutral , after filtering again, freeze in a vacuum freeze-drying box for 12 hours, and dry for 12 hours to obtain alkali hydrolyzed leather;

[0040] Step 3: Take 20 mL of tannic acid solution with a concentration of 95% and 10 g of alkali-hydrolyzed leather and add them to a stainless steel reacto...

Embodiment 3

[0043] A method for preparing a modified sponge leather material for absorbing heavy metals, comprising the following steps:

[0044] Step 1. Cut the waste leather into uniform square particles and soak them in ultrapure water for 36 hours, then wash them with ultrapure water for 2 to 3 times, and dry them in an oven at 50°C for 24 hours to obtain leather particles;

[0045] Step 2: Take 1 g of dried leather particles and add it to 100 mL of sodium hydroxide solution with a concentration of 0.06 mol / L, then shake it at a constant temperature for alkali hydrolysis and activation for 90 minutes, filter it, and wash it repeatedly with water until the pH value of the filtrate is close to neutral , after filtering again, freeze in a vacuum freeze-drying box for 12 hours, and dry for 12 hours to obtain alkali hydrolyzed leather;

[0046] Step 3: Take 20mL of tannic acid solution with a concentration of 85% and 8g of alkali-hydrolyzed leather and put them into a stainless steel react...

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Abstract

The invention discloses a preparation method for a modified sponge leather heavy metal adsorption material. The method includes: cutting waste leather into uniform particles and immersing the particles in water, then performing drying to obtain leather particles; adding the dried leather particles into an alkaline solution, then conducting constant temperature oscillation for alkaline hydrolysis activation, and performing filtering, using water for washing repeatedly until the pH value of the filtrate approaches neutral, then conducting filtering again, and performing vacuum freeze drying so as to obtain alkali hydrolyzed leather; adding a tannic acid solution and the alkali hydrolyzed leather into a reaction kettle, performing mixing, then screwing up the reaction kettle, and placing the reaction reactor at certain temperature to react for certain period of time; then taking the product out and performing natural cooling to room temperature; placing the reaction product in ultrapure water, and carrying out stirring washing, filtering and drying, thus obtaining the modified sponge leather adsorption material. According to the invention, after modification, the prepared new modified sponge leather heavy metal adsorption material has high chromium adsorption capacity, can be used for treatment of chromium-containing wastewater, and has good economic benefits and application prospects.

Description

technical field [0001] The invention belongs to the technical field of utilization of biomass material resources and composite adsorption materials, and relates to a preparation method and application of a modified sponge leather adsorption heavy metal material. It is especially suitable for biomass modification technology and application of adsorption materials. Background technique [0002] The waste in the tanning process is mainly divided into two types: solid and liquid. Among them, solid waste is mainly the leftovers cut, reduced and trimmed in tanning, and protein is its main component; while liquid waste is mainly waste liquid and sludge, and raw hides are hydrolyzed by acid, alkali and enzymes. The resulting amino acids and proteins are its main constituents. Leather solid waste is divided into chrome-containing and chromium-free, and chromium is highly toxic. Therefore, the fields involved in the recycling of these two wastes are quite different. [0003] Collag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J20/28045C02F1/286C02F2101/22
Inventor 张永德都忠伟乔丹张思月
Owner SOUTHWEAT UNIV OF SCI & TECH