Environment-friendly biological hydroxymethyl cellulose photocatalytic composite membrane as well as preparation method and application thereof

Abstract

The invention discloses an environment-friendly biological hydroxymethyl cellulose photocatalytic composite membrane as well as a preparation method and application thereof, and belongs to the field of photocatalyst preparation and photocatalytic environmental management. The preparation method of the environment-friendly biological hydroxymethyl cellulose photocatalytic composite membrane mainlycomprises the following steps: firstly, ultrasonic assisted bionic extraction of barley straws; secondly, extraction of hydroxymethyl cellulose; thirdly, preparation of a barley straw hydroxymethyl cellulose membrane; fourthly, preparation of the hydroxymethyl cellulose photocatalytic composite membrane. The composite membrane prepared by the preparation method disclosed by the invention, has theadvantages of safety and no toxicity, biodegradability, economy and environment friendliness and low cost; barley straws as agricultural wastes are recycled, so that recyclable development of economyis realized.

Description

technical field

[0001] The invention relates to the fields of photocatalyst preparation and photocatalytic environmental treatment, in particular to a hydroxymethylcellulose photocatalytic composite film material. Background technique

[0002] Agricultural waste barley straw has a complex structure, mainly composed of cellulose, hemicellulose, lignin and some other organic substances. Among them, the cellulose content is about 31%-40%, the hemicellulose content is about 35%-48%, and the lignin content is about 11%-25%. formed polymer compounds. But the difference is that cellulose is only produced by the polymerization of a sugar unit (glucose) through the same connection, while hemicellulose is produced by D-xylose, D-arabinose, D-mannose, D-hemicellulose A polysaccharide compound composed of one or several structural units of lactose and D-glucose through oxygen bridges. Therefore, hemicellulose can be divided into xylose hemicellulose, mannose hemicellulose and glucose...

Examples

Embodiment 1

[0031] Example 1 Preparation of Environmentally Friendly Biological Hydroxymethyl Cellulose Photocatalytic Composite Membrane

[0032] Follow the steps below:

[0033] (1) Ultrasonic-assisted biomimetic extraction of barley straw: dry and crush the barley straw, pass through a 100-mesh sieve, add 10 times the weight of petroleum ether to degrease, and filter under reduced pressure. Mix barley straw powder, fiber softener, and bionic extract at a weight ratio of 1:10:20, heat in a water bath at 37°C, seal with a plastic film, and extract with microwaves. The microwave frequency is 2200MHz, the microwave power is 400W, and the extraction time is 40min. Filtrate with suction, collect the filtrate, concentrate in a water bath to 1 / 4 volume, collect the concentrate, and dry at 100°C to obtain hydroxymethylcellulose powder with a yield of 65%;

[0034] (2) Extraction of hydroxymethyl cellulose: take the barley straw biomimetic extract prepared in step (1), add ethyl acetate-acetone...

Embodiment 2

[0039] Example 2 Preparation of Environmentally Friendly Biological Hydroxymethyl Cellulose Photocatalytic Composite Membrane

[0040] Follow the steps below:

[0041] (1) Extraction of hydroxymethyl cellulose from barley straw: dry the barley straw, crush it, pass through a 100-mesh sieve, add 10 times the weight of petroleum ether to degrease, and filter under reduced pressure. Mix barley straw powder, fiber softener, and bionic extract at a weight ratio of 1:20:40, heat in a water bath at 37°C, seal with a plastic film, and extract with microwaves. The microwave frequency is 2700MHz, the microwave power is 500W, and the extraction time is 60 minutes. Filtrate with suction, collect the filtrate, concentrate in a water bath to 1 / 4 volume, collect the concentrate, and dry at 100°C to obtain hydroxymethylcellulose powder with a yield of 92%;

[0042] (2) Extraction of hydroxymethyl cellulose: take the barley straw biomimetic extract prepared in step (1), add ethyl acetate-acet...

technical field

[0001] The invention relates to the fields of photocatalyst preparation and photocatalytic environmental treatment, in particular to a hydroxymethylcellulose photocatalytic composite film material. Background technique

[0002] Agricultural waste barley straw has a complex structure, mainly composed of cellulose, hemicellulose, lignin and some other organic substances. Among them, the cellulose content is about 31%-40%, the hemicellulose content is about 35%-48%, and the lignin content is about 11%-25%. formed polymer compounds. But the difference is that cellulose is only produced by the polymerization of a sugar unit (glucose) through the same connection, while hemicellulose is produced by D-xylose, D-arabinose, D-mannose, D-hemicellulose A polysaccharide compound composed of one or several structural units of lactose and D-glucose through oxygen bridges. Therefore, hemicellulose can be divided into xylose hemicellulose, mannose hemicellulose and glucose...

Examples

Embodiment 1

[0031] Example 1 Preparation of Environmentally Friendly Biological Hydroxymethyl Cellulose Photocatalytic Composite Membrane

[0032] Follow the steps below:

[0033] (1) Ultrasonic-assisted biomimetic extraction of barley straw: dry and crush the barley straw, pass through a 100-mesh sieve, add 10 times the weight of petroleum ether to degrease, and filter under reduced pressure. Mix barley straw powder, fiber softener, and bionic extract at a weight ratio of 1:10:20, heat in a water bath at 37°C, seal with a plastic film, and extract with microwaves. The microwave frequency is 2200MHz, the microwave power is 400W, and the extraction time is 40min. Filtrate with suction, collect the filtrate, concentrate in a water bath to 1 / 4 volume, collect the concentrate, and dry at 100°C to obtain hydroxymethylcellulose powder with a yield of 65%;

[0034] (2) Extraction of hydroxymethyl cellulose: take the barley straw biomimetic extract prepared in step (1), add ethyl acetate-acetone...

Embodiment 2

[0039] Example 2 Preparation of Environmentally Friendly Biological Hydroxymethyl Cellulose Photocatalytic Composite Membrane

[0040] Follow the steps below:

[0041] (1) Extraction of hydroxymethyl cellulose from barley straw: dry the barley straw, crush it, pass through a 100-mesh sieve, add 10 times the weight of petroleum ether to degrease, and filter under reduced pressure. Mix barley straw powder, fiber softener, and bionic extract at a weight ratio of 1:20:40, heat in a water bath at 37°C, seal with a plastic film, and extract with microwaves. The microwave frequency is 2700MHz, the microwave power is 500W, and the extraction time is 60 minutes. Filtrate with suction, collect the filtrate, concentrate in a water bath to 1 / 4 volume, collect the concentrate, and dry at 100°C to obtain hydroxymethylcellulose powder with a yield of 92%;

[0042] (2) Extraction of hydroxymethyl cellulose: take the barley straw biomimetic extract prepared in step (1), add ethyl acetate-acet...

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