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Ammonium thiocyanate modified seaweed biotype absorbent and preparation method and application thereof

A technology of ammonium thiocyanate and modified seaweed, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve problems such as wastewater is difficult to meet discharge standards, chromium cannot be recycled, and a large amount of sludge , to achieve the effect of great recycling significance, good structure and easy collection

Inactive Publication Date: 2012-06-20
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many traditional methods for treating chromium-containing wastewater, such as ion exchange method, membrane separation method, electrolytic reduction method, active detergent desorption method, etc. These methods either cannot recycle chromium in wastewater, or the wastewater after treatment is still It is difficult to meet the emission standards, the cost is too high, and even a large amount of sludge will be generated, causing secondary pollution and other problems, so it cannot be widely promoted

Method used

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  • Ammonium thiocyanate modified seaweed biotype absorbent and preparation method and application thereof
  • Ammonium thiocyanate modified seaweed biotype absorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) drying the seaweed, grinding it, passing through a 20-mesh sieve, and immersing it in hydrochloric acid with a concentration of 0.3mol / L for 4 hours to obtain a mixed solution; filtering the mixed solution, rinsing, and drying to obtain the pretreated seaweed;

[0028] (2) in the seaweed after pretreatment, add the ammonium thiocyanate and monochloroacetic acid that mass ratio is 0.2: 1, the seaweed after described pretreatment and the mass ratio of ammonium thiocyanate are 0.2: 1, adjust pH value To 3, the modification reaction is carried out at a temperature of 30° C.; after reacting for 6 hours, filter, rinse, and dry to obtain ammonium thiocyanate-modified seaweed biosorbent.

[0029] The obtained ammonium thiocyanate modified seaweed bio-adsorbent according to the Cr of every 100mL 6+ Add 1.0g of the solution to the Cr solution with a concentration of 14mg / L 6+ In the solution, after stirring and adsorbing for 2 hours, the adsorption rate reached 40%.

Embodiment 2

[0031] (1) drying the seaweed, grinding it, passing through a 50-mesh sieve, and immersing it in hydrochloric acid with a concentration of 0.2mol / L for 6 hours to obtain a mixed solution; filtering the mixed solution, rinsing, and drying to obtain the pretreated seaweed;

[0032] (2) adding mass ratio to the pretreated seaweed is ammonium thiocyanate and monochloroacetic acid of 0.6: 1, and the mass ratio of the pretreated seaweed and ammonium thiocyanate is 0.5: 1 to adjust the pH value To 4, the modification reaction is carried out at a temperature of 30° C.; after reacting for 4 hours, filter, rinse, and dry to obtain ammonium thiocyanate-modified seaweed biosorbent.

[0033] The obtained ammonium thiocyanate modified seaweed bio-adsorbent according to the Cr of every 100mL 6+ Add 3.0g of the solution to the Cr solution with a concentration of 30mg / L 6+ In the solution, after stirring and adsorbing for 2 hours, the adsorption rate reached 65%.

Embodiment 3

[0035] (1) drying the seaweed, grinding it, passing through a 30-mesh sieve, soaking it in hydrochloric acid with a concentration of 0.1mol / L for 8 hours to obtain a mixed solution; filtering the mixed solution, rinsing, and drying to obtain the pretreated seaweed;

[0036] (2) adding mass ratio to ammonium thiocyanate and monochloroacetic acid of 0.8: 1 in the seaweed after pretreatment, the mass ratio of seaweed after described pretreatment and ammonium thiocyanate is 0.8: 1, adjusts the pH value To 4, the modification reaction is carried out at a temperature of 30° C.; after reacting for 5 hours, filter, wash, and dry to obtain ammonium thiocyanate-modified seaweed biosorbent.

[0037] The obtained ammonium thiocyanate modified seaweed bio-adsorbent according to the Cr of every 100mL 6+ Dosing 2.0g amount in the solution, adding to the Cr with concentration of 14mg / L 6+ In the solution, after stirring and adsorbing for 2 hours, the adsorption rate reached 69%.

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Abstract

The invention discloses a preparation method of an ammonium thiocyanate modified seaweed biotype absorbent, which comprises the following steps of: drying seaweed, grinding, sieving and immersing in hydrochloric acid to obtain mixed liquid; filtering, washing and drying the mixed liquid to obtain preprocessed seaweed; drying the processed seaweed, and adding ammonium thiocyanate and chloroacetic acid; carrying out modification reaction after adjusting a pH value; and filtering, washing and drying after the reaction to obtain the ammonium thiocyanate modified seaweed biotype absorbent. The ammonium thiocyanate modified seaweed biotype absorbent is used for absorbing Cr6+, the absorbed Cr6+ can be eluted by acid, so that heavy metal is recycled, and a recycled material is reused. In the invention, ammonium thiocyanate is utilized to modify the seaweed, so that the absorption activation point of the seaweed is increased, and the capability of seaweed to absorb the heavy metal is improved. The absorbent disclosed by the invention has high absorption efficiency and volume, and is economic and suitable.

Description

technical field [0001] The invention belongs to the field of biosorbents, in particular to an ammonium thiocyanate-modified seaweed biosorbent and its preparation method and application. Background technique [0002] Chromium and its compounds are widely used in industry. A series of industries such as metallurgy, chemical industry, mineral engineering, electroplating, leather, dyes, pharmaceuticals, light industry, spinning, dyeing, and production of chromium salts and chromium compounds will produce a large amount of chromium. waste water. The most common compounds of chromium are trivalent and hexavalent, and the toxicity is higher than that of hexavalent; hexavalent chromium is easily absorbed by the human body, and it can invade the human body through digestion, respiratory tract, skin and mucous membranes. When the breathing air contains different concentrations of chromic anhydride, there will be varying degrees of hoarseness, atrophy of the nasal mucosa, and in seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 万俊杰何志海曹宏芬何迎君骆瑞萍刘世劲黄远超肖桂娜梁智丽罗浩杰周禄成
Owner GUANGDONG IND TECHN COLLEGE
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