CN106179209A

CN106179209A - A kind of Cr VI adsorbent and its preparation method and application

Info

Publication number: CN106179209A
Application number: CN201610567918.3A
Authority: CN
Inventors: 沙海涛; 吴云海; 明珠; 姹丽根
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2016-07-18
Filing date: 2016-07-18
Publication date: 2016-12-07
Anticipated expiration: 2036-07-18
Also published as: CN106179209B

Abstract

The invention discloses a kind of Cr VI adsorbent and its preparation method and application, described adsorbent comprises modified bamboo powdered carbon, and the particle diameter of modified bamboo powdered carbon is not less than 60 mesh.Compared with prior art, the invention have the advantages that chromic adsorption efficiency, through the modified bamboo charcoal of the method for the invention, when using as adsorbent, is improved by (1)；(2) modified bamboo charcoal is environmentally friendly, pollution-free, and modifying process is simple to operation；(3) adsorbent of the present invention is applied to non-secondary pollution produce life in water treatment procedure, to human body fanout free region.

Description

A kind of Cr VI adsorbent and its preparation method and application

Technical field

The invention belongs to water treatment field, relate to a kind of chromic method in removal water, particularly relate to a kind of Cr VI Adsorbent and its preparation method and application.

Background technology

Along with developing rapidly of commercial production and human society, problem of environmental pollution increases the weight of day by day.Countless polluters Being discharged in water environment, wherein heavy metal pollutants has hypertoxicity or a carcinogenecity, and be difficult to biodegradable. Additionally, it is enriched with the most in vivo and and then is accumulated in organism or human body by food chain.

In view of hazardness and its extensive application in various commercial production, manufacture process of chromium, have from industrial wastewater The removal chromium of effect has great importance.In water body, chromic conventional processing method has chemistry (reduction) sedimentation method, electrochemistry Method, membrane processing method, ion exchange, biological treatment and absorption method etc..

Compared with numerous methods, absorption method generally utilizes the porous of adsorbing material to be fixed on by the harmful substance in sewage Its surface thus removed.Non-energy-consumption, non-secondary pollution, removal process does not have harmful material produce.China Bamboo resource is the abundantest, and bamboo itself is also required to felling, promotes the growth of Hsinchu.Bamboo wood is pyrolyzed gained by bamboo charcoal exactly, So doing adsorbent with bamboo charcoal, cost is the lowest.Except directly utilizing bamboo wood, it is also possible to utilize the residue of bamboo processing to prepare bamboo Charcoal.Extensive, the cheap and very promising adsorbing material as a kind of raw material sources, the applicable value of bamboo charcoal must deeper into Research also improves its adsorption effect to water pollutant as far as possible.Bamboo charcoal can be as a kind of choosing outside conventional carbon Select, while process utilizes garbage, reduce the cost using conventional carbon, increase economic efficiency.

For heavy metal pollution in water, existing treatment technology mainly includes chemical precipitation method, electrochemical process, membrance separation Method and ion exchange etc..The means generally used of chemical precipitation method are that hexavalent chrome reduction becomes three prices, add Calx Or sodium hydroxide, makes trivalent trellis hydrate precipitate in the basic conditions, is then removed, but the method can be produced There is bigger difficulty in raw a large amount of mud, the management of mud, transport and final process, cost is high, secondary pollution the most easily occurs；Electricity Chemical method combines electrochemistry and chemical reaction process, but effect when processing the heavy metal containing sewage of low concentration is managed not Thinking, power consumption is big, and operating cost is high, and one-time investment is high；Ion exchange also exists ion exchange resin in regeneration cost Higher problem；The cost of film processing procedure is the highest, and process is complicated, and fouling membrane and membrane permeation flux are low.

Summary of the invention

Solve the technical problem that: in order to overcome the defect of prior art, it is thus achieved that a kind of Cr VI adsorption efficiency is high, and to ring The free of contamination adsorbent in border, the invention provides a kind of Cr VI adsorbent and its preparation method and application.

Technical scheme: a kind of Cr VI adsorbent, described adsorbent comprises modified bamboo powdered carbon, and the particle diameter of modified bamboo powdered carbon is not Less than 60 mesh.

The preparation method of a kind of Cr VI adsorbent, comprises the steps of

(1) bamboo charcoal is broken for thin block, boils in distilled water 30～60 minutes, be cooled to room temperature, at 100 DEG C～120 Dry 20～30 hours at DEG C；

(2) bamboo charcoal step (1) obtained crushes, polishing, utilizes the screen cloth of 60 mesh to screen bamboo charcoal, obtains bamboo charcoal Powder, collects and stores preparation；

(3) by copper sulfate pentahydrate and 3-aminopropyl trimethoxysilane, successively put in the flask filling normal hexane, magnetic Power stirring stirring 30～60 minutes；

(4) bamboo carbon powder step (2) obtained adds in the mixed solution of step (3) gained, magnetic agitation 18～20 Hour, and through distilled water flushing, supersound process and filtration, the bamboo carbon powder being filtrated to get is dried at 100 DEG C～120 DEG C, I.e. obtain adsorbent.

Preferably, in step (3), copper sulfate pentahydrate consumption is 2～3g, 3-aminopropyl trimethoxysilane consumption be 3～ 4g, normal hexane consumption is 50mL.

Preferably, in step (4), bamboo carbon powder addition is 3～5g.

The application in water processes of the described a kind of Cr VI adsorbent.

Preferably, every 50mL water sample, the amount needing adsorbent is 0.04～0.08g.

Beneficial effect: (1) through the modified bamboo charcoal of the method for the invention, when using as adsorbent, to chromic Adsorption efficiency improves；(2) modified bamboo charcoal is environmentally friendly, pollution-free, and modifying process is simple to operation；(3) present invention It is raw, to human body fanout free region that described adsorbent is applied to non-secondary pollution produce in water treatment procedure.

Detailed description of the invention

Following example further illustrate present disclosure, but should not be construed as limitation of the present invention.Without departing substantially from In the case of present invention spirit and essence, the amendment that the inventive method, step or condition are made and replacement, belong to the present invention Scope.If not specializing, the conventional means that technological means used in embodiment is well known to those skilled in the art.

Embodiment 1

Take the hexavalent chromium solution of four parts of 4mg/L, it is ensured that in the case of remaining condition is constant, add different adsorbents Amount, observe the chromic amount of adsorbent number, details are shown in Table 1.

Table 1

	Initial hexavalent chromium concentration (mg/L)	Quantity of sorbent (g)	Adsorbance (mg/g)
				1	4	0.04	4.375
2	4	0.05	3.451
				3	4	0.06	3.083
4	4	0.08	3.131

Adsorbance in table 1 refers to unit adsorbance, shows the adsorbent of unit mass and the ratio of adsorbance, from table 1 Visible, that the present invention prepares adsorbent, is not that quantity of sorbent is added the most, and effect is the best, needs in view of to absorption The utilization rate of agent.

Embodiment 2

Taking the hexavalent chromium solution of four parts of variable concentrations, the result of reference example 1, adsorbent measures above-mentioned adsorbance result Best 0.04g, other conditions are constant, the change of observation unit's adsorbance, and details are shown in Table 2.

Table 2

	Initial hexavalent chromium concentration (mg/L)	Quantity of sorbent (g)	Adsorbance (mg/g)
				1	4	0.04	4.375
2	5	0.04	5.672
				3	6	0.04	7.864
4	8	0.04	8.387

From table 2 result, initial concentration is the biggest, and the result of adsorbance is the best.

Embodiment 3

Considering in real life, the hexavalent chromium concentration in sewage will not be the highest, takes the Cr VI that four parts of concentration is 4mg/L molten Liquid, adds quantity of sorbent 0.04g of equal in quality, reacts the different time, and other conditions are constant, observes the change of adsorbance. Details are shown in Table 3.

Table 3

As seen from Table 3, adsorbent is not to increase over time and increase, most preferably adsorbance chromic in solution Response time is 180min, more than 180min, owing to excessive vibration makes the Cr VI being adsorbed onto on adsorbent take off again Falling, so not the longer the better the response time, therefore 180min is the adsorption time that adsorbent of the present invention is optimal.

Embodiment 4

Take the waste water that hexavalent chromium concentration is 4mg/L of different pH value, add quantity of sorbent 0.04g of equal in quality, other Condition is constant, observes the change of adsorbance, and details are shown in Table 4.

Table 4

	pH	Quantity of sorbent (g)	Adsorbance (mg/g)
				1	4	0.04	3.033
2	6	0.04	4.213
				3	8	0.04	4.375
4	10	0.04	3.241

As seen from Table 4, when pH value is 8, adsorbance is maximum.Change in view of other parameter, it is believed that reaction condition PH be neutral or close to time neutral, most beneficial for adsorbent of the present invention, Cr VI adsorption reaction is carried out.

Claims

1. a Cr VI adsorbent, it is characterised in that described adsorbent comprises modified bamboo powdered carbon, and the particle diameter of modified bamboo powdered carbon is not Less than 60 mesh.

2. the preparation method of a kind of Cr VI adsorbent described in claim 1, it is characterised in that comprise the steps of

(1) bamboo charcoal is broken for thin block, boils in distilled water 30～60 minutes, be cooled to room temperature, at 100 DEG C～120 DEG C Dry 20～30 hours；

(2) bamboo charcoal step (1) obtained crushes, polishing, utilizes the screen cloth of 60 mesh to screen bamboo charcoal, obtains bamboo charcoal powder End, collects and stores preparation；

(3) by copper sulfate pentahydrate and 3-aminopropyl trimethoxysilane, successively putting in the flask filling normal hexane, magnetic force stirs Agitating mixes 30～60 minutes；

(4) bamboo carbon powder step (2) obtained adds in the mixed solution of step (3) gained, magnetic agitation 18～20 hours, And through distilled water flushing, supersound process and filtration, the bamboo carbon powder being filtrated to get is dried at 100 DEG C～120 DEG C, i.e. obtains Adsorbent.

The preparation method of a kind of Cr VI adsorbent the most according to claim 2, it is characterised in that step (3) Zhong Wushui Closing copper sulfate consumption is 2～3g, and 3-aminopropyl trimethoxysilane consumption is 3～4g, and normal hexane consumption is 50mL.

The preparation method of a kind of Cr VI adsorbent the most according to claim 2, it is characterised in that bamboo charcoal in step (4) Powder addition is 3～5g.

5. the application in water processes of a kind of Cr VI adsorbent described in claim 1.

Application the most according to claim 5, it is characterised in that every 50mL water sample, need the amount of adsorbent be 0.04～ 0.08g。