CN106540655A - A kind of method that microwave and the composite modified coffee shell of activator prepare formaldehyde adsorbent - Google Patents

Abstract

A kind of method that microwave and the composite modified coffee shell of activator prepare formaldehyde adsorbent, first, potassium hydroxide solution is mixed with liquor alumini chloridi, obtains composite activating agent；Then, coffee shell is mixed with composite activating agent by a certain percentage, impregnates post-drying, drying post-heating, obtains carbonized material, carbonized material is placed in microwave heating reactor, it is passed through steam heating, material is washed with hydrochloric acid solution in neutrality, is washed until being neutral with pH detection paper carbonized materials, material is dried, it is analyzed test, the specific surface area >=4200m of gained adsorbent²/ g, Micropore volume are 1.2 ~ 1.8ml/g, and pore volume rate reaches more than 90%, is a kind of excellent formaldehyde adsorbent.Using microwave and the composite modified coffee shell of activator, the performance of coffee shell formaldehyde adsorption is optimized, there is provided a kind of preparation method of novel air cleanser, realize the resource recycling of coffee shell, have good environmental benefit and application prospect.

Description

A kind of method that microwave and the composite modified coffee shell of activator prepare formaldehyde adsorbent

Technical field

The present invention relates to a kind of preparation method of formaldehyde adsorbent, and in particular to a kind of with coffee shell as raw material, the method that high-ratio surface, high microporosity activated carbon adsorption formaldehyde are prepared using the composite modified method for combining of microwave and activator.

Background technology

With the improvement of people's living standards, requirement more and more higher to environment, people thirst for living in clean and free of contamination air, but industrial expansion, environmental pollution are still increasingly sharpening, the particularly pollution of house ornamentation, ordinary people is allowed more to recognize formaldehyde such a material, then, preparation is a kind of simple and convenient, and the cheap formaldehyde adsorbent of cost is just particularly important.

At present, coffee is no longer a kind of high-end beverage, has been entered in the life of common people at leisure, and the demand of coffee is increasing, and coffee shell is also more and more.The place of production of the Yunnan for mild, coffee shell is used as the garbage in Coffee Production, generally all it is treated as volume increase rubbish to lose, it is used for fertilizer stacking on a small quantity, coffee shell is loose stronger absorbability, there is the special aroma of one coffee simultaneously, if the adsorbent that coffee shell can be utilized to be fabricated to formaldehyde, not only can purify the air of a room, and its special fragrance can also allow people to be in a cheerful frame of mind, but it is considerably less to the utilization of coffee shell at present, if it is possible to by coffee shell using come formaldehyde adsorbent processed, it will to produce huge commercial value.

A kind of natural new material being combined for filter rod and its application are disclosed in publication number 103340478A, and the invention to take during coffee produces base and discarded fresh coffee shell is stripped out when harvesting, and is less than 30% in outdoor dry in the sun to moisture content；Then the coffee shell after dry in the sun is put in baking device, moisture content is baked to 9 ~ 12% in the low temperature that temperature is 60 DEG C or so；The coffee shell after baking is cut into into thread or graininess again, addition or without bar-shaped composite material being rolled into after humectant and tobacco extract；The natural composite material is combined with acetate fiber fibroin, used as the materials application for preparing binary combined filter tip rod.The method have the characteristics that：Natural material is with low cost, Environmental Safety, is good pure natural new material；The filtration of the bulky grain aerosol matter in absorption flue gas can be played, can give the special baking of Medicated cigarette fragrant and sweet rhythm, economic benefit and social benefit are notable.

A kind of degradable environment-friendly material and its preparation method and application is disclosed in publication number 101531820, the invention coffee shell or coffee bean dregs are mixed with food stage solid gum powder.In the preparation, crushing, stirring and hot-forming three steps are included, this environment-friendly materials can be used in disposable tableware, Potted landscape vessel and high-density plate.This environment-friendly materials can realize twice laid, energy-conserving and environment-protective；Low production cost, economic benefits；And after use, can realize self solving in nature, it is free from environmental pollution, meet in national standard with regard to human-body safety and the requirement of environmental pollution.

Also less to the research and utilization of coffee shell at present, present invention utilizes coffee shell is loose and has the characteristic of stronger absorbability, with reference to the method for microwave modification, prepare acticarbon, for formaldehyde adsorption, indoor air purification effect is good, can also have a kind of fragrance of coffee.

The content of the invention

The purpose of the present invention prepares activated carbon methyl aldehyde adsorption material using coffee shell microwave heating is modified, the characteristics of methyl aldehyde adsorption material has high-ratio surface, high microporosity, room air pollution is effectively solved the problems, such as, its method simple practical, cost are relatively low, have good industrial operability.

The present invention is completed according to the following steps：

(1) By the potassium hydroxide solution of 2 ~ 3mol/L of mass concentration and 0.1 ~ 0.2mol/L of mass concentration liquor alumini chloridis with 2：0.5 ~ 3 volume ratio mixing；

(2) By coffee shell with composite activating agent by quality (g) and volume ratio (ml) 1：2 ~ 3 ratio mixing, impregnates 10 ~ 20 hours；

(3) Raw material after (2) are impregnated is dried to biodiversity percent at 50 ~ 90 DEG C less than 5%, and the time is 2 ~ 5 hours；

(4) dried raw material is warming up at 400 ~ 600 DEG C with 6 ~ 10k/min of heating rate in Muffle furnace and is reheated 0.5 ~ 2 hour, obtain carbonized material；

(5) carbonized material obtained in (4) is added in microwave heating reactor, is passed through water vapour, 3 ~ 8min is heated under the conditions of 600 ~ 900 DEG C of temperature；

(6) material obtained in (5) is carried out first with 1:Then 7 ~ 8 hydrochloric acid solution washing is washed again in neutrality, until being neutral with pH detection paper carbonized materials；

(7) by the material obtained in (6) in an oven, temperature is to dry 1 ~ 5 hour at 50 ~ 70 DEG C, is analyzed test, specific surface area >=4200m²/ g, Micropore volume are 1.2 ~ 1.8ml/g, and Micropore volume rate reaches more than 90%, be suitable as the material of formaldehyde adsorbent.

Compared with known technology, the present invention has the advantage that：

（1） Make use of coffee shell tissue fibers loose, with stronger absorbability, turn waste into wealth, economize on resources, reduces cost goes back Environmental Safety, be good pure natural new material, and the coffee shell fragrance of itself is utilized；

（2） Discarded coffee shell is make use of to do raw material, it is with low cost；

（3） Make use of aluminum chloride to combine with potassium hydroxide as new composite activating agent, reduce the utilization of potassium hydroxide, it is to avoid corrosion of traditional strong basicity activator to equipment, and the increased activity of activated carbon, improve the ability of formaldehyde adsorption；

（4） Using microwave heating, the time of activation is greatly reduced, from the soak time of original 2 ~ 3 hours, has tapered to 3 ~ 8 minutes, saved the utilization of the energy.

Specific embodiment：

Embodiment 1：

(1) by the potassium hydroxide solution of mass concentration 2.5mol/L and mass concentration 0.15mol/L liquor alumini chloridi with 2：0.8 volume ratio mixing；

(2) coffee shell is pressed into quality (g) and volume ratio (ml) 1 with composite activating agent：2.5 ratio mixing, impregnates 15 hours；

(3) raw material after (2) dipping is dried to biodiversity percent at 65 DEG C less than 5%, the time is 3.5 hours；

(4) dried raw material is warming up to reheat at 500 DEG C with heating rate 8k/min in Muffle furnace and obtains carbonized material in 2 hours；

(5) carbonized material obtained in (4) is added in microwave heating reactor, is passed through water vapour, 4min is heated under the conditions of 700 DEG C of temperature；

(6) material obtained in (5) is carried out first with 1:Then 7.5 hydrochloric acid solution washing is washed again in neutrality, until being neutral with pH detection paper carbonized materials；

(7) by the material obtained in (6) in an oven, temperature is to dry 2 hours at 60 DEG C, is analyzed test, specific surface area >=4300m²/ g, Micropore volume are 1.2 ~ 1.8ml/g, and Micropore volume rate reaches 95%, be suitable as the material of formaldehyde adsorbent.

Embodiment 2：

(1) by the potassium hydroxide solution of mass concentration 2.8mol/L and mass concentration 0.2mol/L liquor alumini chloridi with 2：1 volume ratio mixing；

(2) coffee shell is pressed into quality (g) and volume ratio (ml) 1 with composite activating agent：2.8 ratio mixing, impregnates 18 hours；

(3) raw material after (2) dipping is dried to biodiversity percent at 60 DEG C less than 5%, the time is 4 hours；

(4) dried raw material is warming up at 500 DEG C with heating rate 7k/min in Muffle furnace and is reheated 2 hours, obtain carbonized material；

(5) carbonized material obtained in (4) is added in microwave heating reactor, is passed through water vapour, 3.5min is heated under the conditions of 800 DEG C of temperature；

(6) material obtained in (5) is carried out first with 1:Then 7.5 hydrochloric acid solution washing is washed again in neutrality, until being neutral with pH detection paper carbonized materials；

(7) by the material obtained in (6) in an oven, temperature is to dry 3 hours at 55 DEG C, is analyzed test, specific surface area >=4250m²/ g, Micropore volume are 1.2 ~ 1.8ml/g, and Micropore volume rate reaches 97%, be suitable as the material of formaldehyde adsorbent.

Claims (1)

1. a kind of method that microwave and the composite modified coffee shell of activator prepare formaldehyde adsorbent, it is characterised in that the method is completed according to the following steps：

By the potassium hydroxide solution of 2 ~ 3mol/L of mass concentration and 0.1 ~ 0.2mol/L of mass concentration liquor alumini chloridis with 2：0.5 ~ 3 volume ratio mixing；

By coffee shell with composite activating agent by quality (g) and volume ratio (ml) 1：2 ~ 3 ratio mixing, impregnates 10 ~ 20 hours；

Raw material after (2) are impregnated is dried to biodiversity percent at 50 ~ 90 DEG C less than 5%, and the time is 2 ~ 5 hours；

(4) dried raw material is warming up at 400 ~ 600 DEG C with 6 ~ 10k/min of heating rate in Muffle furnace and is reheated 0.5 ~ 2 hour, obtain carbonized material；

(5) carbonized material obtained in (4) is added in microwave heating reactor, is passed through water vapour, 3 ~ 8min is heated under the conditions of 600 ~ 900 DEG C of temperature；

(6) material obtained in (5) is carried out first with 1:Then 7 ~ 8 hydrochloric acid solution washing is washed again in neutrality, until being neutral with pH detection paper carbonized materials；

(7) by the material obtained in (6) in an oven, temperature is to dry 1 ~ 5 hour at 50 ~ 70 DEG C, is analyzed test, specific surface area >=4200m²/ g, Micropore volume are 1.2 ~ 1.8ml/g, and Micropore volume rate reaches more than 90%, be suitable as the material of formaldehyde adsorbent.