Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of wheat straw modified material for removing lead ions in waste water

A modified material, wheat straw technology, applied in the field of preparation of wheat straw modified materials, can solve the problems of difficult separation and purification of wastewater, reduce the cost of lead-containing wastewater treatment, increase environmental pressure, etc.

Active Publication Date: 2015-01-07
TAICANG BIQI NEW MATERIAL RES & DEV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are mainly the following methods to use wheat straw for the treatment of lead-containing wastewater (Bioresource6(2)(2011)2161-2287; Bioresource Technology104(2012)807–809): (1) Crush the wheat straw and mix it with bentonite, etc. Mixed to make granular water treatment composite materials, this method is low in cost, but the adsorption capacity of lead ions is low, and it cannot be recycled after the adsorption is saturated, causing secondary pollution of solid waste; (2) Crush the wheat straw and use acid Or alkali to treat the straw, destroy the silicon dioxide layer and waxy matter on the surface of the straw, increase the specific surface area of ​​the straw, thereby improving the lead ion adsorption capacity of the straw, the disadvantage of this method is that the acid or alkali treatment process brings environmental pollution , wastewater separation and purification are not easy, and the adsorption capacity of lead ions has not reached the commercial level; (3) The wheat straw is crushed, and the straw is modified with organic acids such as tartaric acid and citric acid (Bioresource Technology99(2008)6709–6724). Carboxyl groups are grafted on the surface, and through the chemical adsorption of carboxyl groups to lead ions, the adsorption capacity of straw to lead ions is greatly improved, usually reaching 100-200 mg (lead ions) / g (wheat straw), thus greatly reducing lead-containing wastewater. The disadvantage of this method is that the organic acid treatment efficiency is low, and the weight ratio of acid to straw is 0.5-1. Excessive acid destroys the structure of straw and generates a large amount of organic residue, which also increases environmental pressure.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of wheat straw modified material for removing lead ions in waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Harvest the wheat straw, wash it with tap water, dry it, put the cleaned wheat straw in a pulverizer, crush it into particles with a particle size of 20-100 mesh, and place the crushed wheat straw in a fiber concentration of 1%. The activity of cellulase is 1000U / g in the aqueous solution of plain enzyme for 1 hour, and the activity of cellulase per gram of wheat straw is 1U / g, taken out, washed with deionized water, and dried to obtain enzyme-treated wheat straw. straw.

[0017] Place the enzyme-treated wheat straw in 0.1% chitin aqueous solution for 10 minutes, take it out, place it in a drying oven, dry it at 60°C for 3 hours, cool it, wash it with deionized water, and dry it to obtain the modified wheat straw material .

[0018] Put 0.03g of wheat straw modified material in 20mL of lead-containing wastewater, adjust the pH value of the solution to 5-6, and adsorb at 20°C for 4 hours. The concentration of lead ions in the lead wastewater is 100-2000mg / L. After the a...

Embodiment 2

[0021] Harvest the wheat straw, wash it with tap water, dry it, put the cleaned wheat straw in a pulverizer, crush it into particles with a particle size of 20-100 mesh, and place the crushed wheat straw in a fiber concentration of 5%. The activity of cellulase is 1000U / g in the aqueous solution of plain enzyme for 3 hours, and the activity of cellulase per gram of wheat straw is 50U / g, taken out, washed with deionized water, and dried to obtain enzyme-treated wheat straw. straw.

[0022] Place the enzyme-treated wheat straw in 5% chitin methanol solution for 30 minutes, take it out, place it in a drying oven, dry it at 80°C for 6 hours, cool it, wash it with deionized water, and dry it to obtain the modified wheat straw Material.

[0023] Put 0.03g of wheat straw modified material in 20mL of lead-containing wastewater, adjust the pH value of the solution to 5-6, and adsorb at 20°C for 4 hours. The concentration of lead ions in the lead wastewater is 100-2000mg / L. After the a...

Embodiment 3

[0026] Harvest the wheat straw, wash it with tap water, dry it, put the cleaned wheat straw in a pulverizer, crush it into particles with a particle size of 20-100 mesh, and place the crushed wheat straw in a fiber concentration of 3%. Sulfase aqueous solution 2 hours, the activity of cellulase is 1000U / g, every gram of wheat stalks applies cellulase to count as 20U / g according to activity, take out, wash with deionized water, dry, obtain the wheat straw of enzyme treatment. straw.

[0027] Put the enzyme-treated wheat straw in 1% chitin ethanol solution for 20 minutes, take it out, put it in a drying oven, dry it at 70°C for 2 hours, cool it, wash it with deionized water, and dry it to obtain the modified wheat straw Material.

[0028] Put 0.03g of wheat straw modified material in 20mL of lead-containing wastewater, adjust the pH value of the solution to 5-6, and adsorb at 20°C for 4 hours. The concentration of lead ions in the lead wastewater is 100-2000mg / L. After the adso...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
adsorption capacityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of water treatment materials and relates to a preparation method of a wheat straw modified material for removing lead ions in waste water. The preparation method is about the modification of wheat straw, and specific technology comprises the following steps of cleaning, crushing, cellulase treatment, chitin modification and the like of the wheat straw. The wheat straw modified material prepared by adopting the method has the following advantages: (1) chemical modification is not involved, and the technological process is green and environment-friendly; (2) the prepared wheat straw modified material is pure natural and degradable; (3) the wheat straw modified material has strong adsorbability to the lead ions in a waste water solution, and each gram of the wheat straw modified material can absorb 820 mg of lead ions, which is 5-8 times of a conventional chemically-modified wheat straw material. The wheat straw modified material prepared by adopting the preparation method can be used for treating lead ion contained waste water in water treatment plants and also can be used for household water purifiers, thereby achieving a broad market prospect.

Description

technical field [0001] The invention belongs to the technical field of water treatment materials, and in particular relates to a preparation method of wheat straw modified materials for removing lead ions in waste water. Background technique [0002] Lead-containing wastewater comes from various battery workshops, mineral processing plants, petrochemical plants, etc. The battery industry is the most important source of lead-containing wastewater, and every battery produced causes at least 4.54 mg of lead loss, followed by the petroleum industry producing gasoline additives. Although lead is not as common as copper and cadmium, it is a common component in wastewater. In particular, battery factories produce a large amount of lead-containing wastewater in the production process. The lead content in wastewater exceeds the national standard by a hundred times, posing a great threat to groundwater sources. If it is discharged arbitrarily without treatment, it will inevitably bri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/24C02F1/28C02F1/62
Inventor 蓝碧健
Owner TAICANG BIQI NEW MATERIAL RES & DEV