CN106276897A - A kind of preparation method of phosphoric acid activation monkey grass - Google Patents

Abstract

A kind of preparation method of phosphoric acid activation monkey grass; monkey grass is placed in the phosphoric acid solution that concentration is 3.5 4mol/L and impregnates 28 36h; after completing, put into 105 110 DEG C of constant temperature blast drying ovens and be dried 28 36h, place in chemical activation stove; under nitrogen protection; it is heated to setting activation temperature 950 DEG C with the heating rate of 4.5 DEG C/min, and keeps 0.75h at this temperature, after activation completes; naturally cool to room temperature, turn off nitrogen and fiber is taken out；Sample after activation distilled water is cleaned 140min under supersonic oscillations until pH value of solution=7, cleaned sample is put into 105 110 DEG C of constant temperature blast drying ovens and is dried 28 36h, i.e. prepare Petiolus Trachycarpi activated carbon fiber.The invention has the beneficial effects as follows: synthesis technique is simple, reaction condition is gentle, and production cost is relatively low, favorable repeatability.

Description

A kind of preparation method of phosphoric acid activation monkey grass

Technical field

The present invention relates to material synthesis method, the preparation method of a kind of phosphoric acid activation monkey grass.

Background technology

Compared with traditional powdery, granular active carbon adsorbing material, activated carbon fiber has specific surface area height, adsorption capacity Greatly, pore structure is flourishing, absorption and the advantage such as desorption rate is fast, is widely used in air cleaning, waste water processes, catalyst carries The aspect such as body, electrode material.At present, prepare the raw material of activated carbon fiber mostly come from Colophonium, phenolic resin, polyacrylonitrile and Prezenta etc..But, along with the day by day exhausted of fossil resource and environmental pollution constantly increase the weight of, reproducible biomass resource Increasingly it is subject to people's attention with its abundance, the advantage of environmental protection.Such as some natural plant fibre Folium Agaves Sisalanae, cotton Flower fiber, cotton stalk, bamboo fibre, silkworm silk etc. have been taken as raw material for preparing activated carbon fiber the most, and show preferably absorption Characteristic.This is possible not only to solve the nervous problem with environmental pollution of activated carbon fiber raw material resources, but also can be with high-valued profit Use biomass resource.Petiolus Trachycarpi, as the relatively conventional economic plants of south China, is distributed widely in Sichuan, Yunnan, Guizhou, lake The ground such as south and Hubei.The tough and tensile epidermin of its growth, i.e. monkey grass, annual production, up to 3.5 ten thousand t, is commonly used for making rope Rope, mattress and inserts etc..In monkey grass, carbon content is higher, content of ashes relatively low (02%), is good material with carbon element forerunner Body；Further, monkey grass internal structure has more flourishing hole, activation process is advantageously used for making of activator Hole.Therefore, monkey grass can be by higher value application in the preparation of activated carbon fiber.

Summary of the invention

The technical problem to be solved is to provide the preparation method of a kind of phosphoric acid activation monkey grass, it is provided that one Plant new synthetic method.

The synthetic method that the present invention uses, comprises the steps:

A, monkey grass is placed in the phosphoric acid solution that concentration is 3.5-4mol/L dipping 28-36h, after completing, put into 105-110 DEG C constant temperature blast drying oven is dried 28-36h, places in chemical activation stove, under nitrogen protection, with the intensification of 4.5 DEG C/min Speed is heated to setting activation temperature 950 DEG C, and keeps 0.75h at this temperature, after activation completes, naturally cools to room Temperature, turns off nitrogen and is taken out by fiber；

B, the monkey grass distilled water that a step prepares is cleaned 140min until pH value of solution=7 under supersonic oscillations, then put Enter 105-110 DEG C of constant temperature blast drying oven and be dried 28-36h, i.e. prepare Petiolus Trachycarpi activated carbon fiber.

The invention has the beneficial effects as follows: synthesis technique is simple, reaction condition is gentle, and production cost is relatively low, favorable repeatability.

Detailed description of the invention

Further illustrating present disclosure below in conjunction with example, as known by the technical knowledge, the present invention also can pass through other The scheme without departing from the technology of the present invention feature describe, the most all within the scope of the present invention or equivalent the scope of the invention in Change and be all included in the invention.

Embodiment 1:

Monkey grass is placed in the phosphoric acid solution that concentration is 3.5mol/L dipping 28h, after completing, puts into 105 DEG C of constant temperature air blast Drying baker is dried 28h, places in chemical activation stove, under nitrogen protection, is heated to setting with the heating rate of 4.5 DEG C/min Activation temperature 950 DEG C, and keep 0.75h at this temperature, after activation completes, naturally cool to room temperature, turn off nitrogen also Fiber is taken out；

Sample after activation distilled water is cleaned 140min under supersonic oscillations until pH value of solution=7, by cleaned sample

Put into 105 DEG C of constant temperature blast drying ovens and be dried 28h, i.e. prepare Petiolus Trachycarpi activated carbon fiber.

Embodiment 2:

1, monkey grass is placed in the phosphoric acid solution that concentration is 4mol/L dipping 36h, after completing, puts into 110 DEG C of constant temperature air blast Drying baker is dried 36h, places in chemical activation stove, under nitrogen protection, is heated to setting with the heating rate of 4.5 DEG C/min Activation temperature 950 DEG C, and keep 0.75h at this temperature, after activation completes, naturally cool to room temperature, turn off nitrogen also Fiber is taken out；

Sample after activation distilled water is cleaned 140min under supersonic oscillations until pH value of solution=7, by cleaned sample

Put into 110 DEG C of constant temperature blast drying ovens and be dried 36h, i.e. prepare Petiolus Trachycarpi activated carbon fiber.

Test activated carbon fiber productivity is by the front monkey grass over dry matter of activity following activation carbon fiber absolute dry mass and activation The ratio of amount.The meansigma methods taking 3 measurement results is ultimate yield, sees formula (1).

Productivity=W 2/ W 1 × 100%

(1), in formula, W1 is the absolute dry mass of the front monkey grass of activation, g；W2 is the absolute dry mass of activity following activation carbon fiber, G.

Experimental result is when activation temperature is 950 DEG C, and productivity is 48%, more than other raw materials and other activation method systems The productivity of standby activated carbon fiber.

Along with the rising of activation temperature, monkey grass surface is corroded by activator and is caused organizational structure to destroy, and productivity drops Low；The activated carbon fiber mesopore content generated reduces, but the generation of beneficially micropore, cause the increase of specific surface area；And along with Activation temperature continues to increase, and partial pore is expanded as mesopore, caused mesopore to increase.

Claims (1)

1. a preparation method for phosphoric acid activation monkey grass, comprises the steps:

A, monkey grass is placed in the phosphoric acid solution that concentration is 3.5-4mol/L dipping 28-36h, after completing, put into 105-110 DEG C constant temperature blast drying oven is dried 28-36h, places in chemical activation stove, under nitrogen protection, with the intensification of 4.5 DEG C/min Speed is heated to setting activation temperature 950 DEG C, and keeps 0.75h at this temperature, after activation completes, naturally cools to room Temperature, turns off nitrogen and is taken out by fiber；

B, the monkey grass distilled water that a step prepares is cleaned 140min until pH value of solution=7 under supersonic oscillations, then put Enter 105-110 DEG C of constant temperature blast drying oven and be dried 28-36h, i.e. prepare Petiolus Trachycarpi activated carbon fiber.