CN1478594A

CN1478594A - Preparation method of heavy metal ion adsorbing agent

Info

Publication number: CN1478594A
Application number: CNA031473024A
Authority: CN
Inventors: 睿王; 王睿
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-04
Filing date: 2003-07-04
Publication date: 2004-03-03
Anticipated expiration: 2023-07-04
Also published as: CN1239252C

Abstract

A process for preparing the adsorbent of heavy metal ions includes such steps as washing egg shell, boiling, crushing, boiling in NaOH solution, removing inner membrane, washing with distilled water, baking in infrared drier, pulverizing and sieving. Its advantages are high adsorbability, low cost and high regeneration efficiency.

Description

A kind of preparation method of adsorbent for heavy metal

Technical field the present invention relates to a kind of preparation method of adsorbent for heavy metal.

The background technology heavy metal ion belongs to objectionable impurities, and it can pass through soil, water, air, especially food chain and carry out enrichment, and human beings'health is constituted irreversible harm.The heavy metal absorbent of people exploitation so far exists that the sorbent material source is limited, cost is higher, the preparation method is complicated, can not regenerate or the not high defective of regeneration efficiency.

Summary of the invention the purpose of this invention is to provide a kind of preparation method of adsorbent for heavy metal.The object of the present invention is achieved like this:

Depleted Ovum crusta Gallus domesticus (being called for short WES) process is washed, boiled, crushes, in 4%～10% NaOH solution, boil, slough inner membrance, be washed with distilled water to neutrality, be placed in the infrared drying oven and dry, pulverize then, obtaining the order number through the standard test screening is respectively: 20～40,40～60,60～100,100～140 WES sorbent material.

Above-mentioned sorbent material WES is added to contains heavy metal ion Pb ²⁺, Cd ²⁺, Cu ²⁺, Zn ²⁺, Hg ²⁺The aqueous solution in and on the vibrator under normal temperature fully the vibration, make it the heavy metal ion in the adsorbent solution.After the heavy metal ion in the WES adsorption aqueous solution reached capacity, its absorption property reached capacity, and at this moment, recover its adsorptive power, need regenerate.

Described renovation process is that the WES sorbent material that will adsorb heavy metal ion separates after filtration with solution, sorbent material is joined in the aqueous solution that contains strippant A then, wherein A is one or more among NaCl, ATMP, HEDP, the EDTA, above-mentioned solution is placed on vibration at normal temperatures on the vibrator, can recovers regenerability fully through 15～30 minutes WES.

WES after the described regeneration can reuse, thereby constitutes a working cycle, and is good in economic efficiency.

The dosage of described sorbent material is 1/250g/ml～1/20g/ml; Heavy metal ion content is below the 1800g/ml in the pending water; The concentration of the used strippant of regenerative process is: NaCl 10～30%, and ATMP, HEDP and EDTA are 0.01～0.05mol/l.

The invention has the beneficial effects as follows:

Sorbent material source is wide, cost is lower, regeneration efficiency is high, and the sorbent material preparation method is simple, to contents of many kinds of heavy metal ion (as Pb ²⁺, Cd ²⁺, Cu ²⁺, Zn ²⁺, Hg ²⁺Deng) having good absorption property, the WES after the Adsorption of Heavy Metal Ions can carry out desorb with strippants such as NaCl, thereby has realized the pollution control to heavy metal ion.

Below the embodiment to contain Pb ²⁺, Cd ²⁺The example that is treated to of water sample is illustrated the present invention.

Embodiment one:

Depleted Ovum crusta Gallus domesticus process is washed, boils, crushes, boiled in 4%～10% NaOH solution, slough inner membrance, be washed with distilled water to neutrality, be placed in red, the outside line loft drier and dry, pulverize then, obtain the order number through the standard test screening and be respectively: 30,50,90,120 WES sorbent material.

Adsorption process adopts constant temperature vibration shaking table to carry out under the complete mixing flow state: the WES that accurately takes by weighing the 90 order granularities of 1.25g puts into exsiccant 250ml Erlenmeyer flask, adds to contain Pb ²⁺Be 800mg/l, with the hunting speed of 220rpm, behind the continuous oscillation 120min, sampling, filtration are measured heavy metal ion Pb in the filtrate with ion-selective electrode analysis to the solution 200ml that contains heavy metal ion of pH=6 then in shaking table under 25 ℃ ²⁺Content.Heavy metal ion Pb ²⁺Adsorption rate be 99.97%.

Heavy metal ion Pb in the WES adsorption aqueous solution ²⁺After reaching capacity, its absorption property reaches capacity, and at this moment, recover its adsorptive power, need regenerate.Renovation process is to have adsorbed heavy metal ion Pb ²⁺The WES sorbent material separate after filtration with solution, then sorbent material is joined in the aqueous solution that contains 20%NaCl, above-mentioned solution is placed on the vibrator vibration at room temperature, can recover regenerability fully through 15～30 minutes WES.Sorbent material WES and solution filtered tell, dry for standby or continue on for removing heavy metal ion Pb ²⁺Constitute a working cycle thus, good in economic efficiency.

Embodiment two: under same experiment condition, to containing Cd ²⁺800mg/1, the water sample of PH=6 is handled, and adsorption rate reaches 98.86%, adopts and with quadrat method sorbent material is regenerated, and the recovery time is 15～30 minutes, and absorption property recovers fully.

Claims

1, a kind of preparation method of adsorbent for heavy metal, it is characterized in that: depleted Ovum crusta Gallus domesticus process is washed, boiled, crushes, in 4%～10% NaOH solution, boil, slough inner membrance, be washed with distilled water to neutrality, be placed in the infrared drying oven and dry, pulverize then, obtain the order number through the standard test screening and be respectively: 20～40,40～60,60～100,100～140 WES sorbent material.

2, sorbent material according to claim 1, it is characterized in that: this sorbent material can be regenerated, described renovation process is that the WES sorbent material that will adsorb heavy metal ion separates after filtration with solution, sorbent material is joined in the aqueous solution that contains strippant A then, wherein A is one or more among NaCl, ATMP, HEDP, the EDTA, above-mentioned solution is placed on vibrated at normal temperatures on the vibrator 15～30 minutes.

3, sorbent material according to claim 1 is characterized in that: the dosage of described sorbent material is 1/250g/ml～1/20g/ml.

4, sorbent material according to claim 1 is characterized in that: the concentration of the used strippant of regenerative process is: NaCl 10～30%, and ATMP, HEDP and EDTA are 0.01～0.05mol/l.