Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for rapidly reducing concentration of heavy metal chromium ions in water

A technology for chromium ions and heavy metals, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of slow adsorption rate and small adsorption capacity, and achieve the reduction of chromium ion concentration and operation Simple, the effect of reducing the concentration of heavy metal chromium ions

Inactive Publication Date: 2021-03-26
CHANGCHUN UNIV OF TECH
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the adsorption materials currently prepared have slow adsorption rate and small adsorption capacity. Compared with them, sodium alginate / tannic acid microspheres have fast adsorption rate and better adsorption effect, and are more suitable for use as adsorbents.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for rapidly reducing concentration of heavy metal chromium ions in water
  • Method for rapidly reducing concentration of heavy metal chromium ions in water
  • Method for rapidly reducing concentration of heavy metal chromium ions in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Fully dissolve sodium alginate and tannic acid in water according to the mass ratio of 10:1, 5:1, 2:1 and 1:1, then slowly drop it into the calcium chloride solution through a syringe, and let it stand for 1 hour , filter out the microspheres and rinse several times with distilled water, and dry to obtain the sodium alginate / tannic acid microsphere adsorbent. Add 0.1 g of prepared sodium alginate / tannic acid microspheres to 50 mL of 20ug / mL chromium-containing ionized water, and the group without tannic acid was used as a blank control, and the supernatant was taken every ten minutes at room temperature , the concentration of chromium ions in the supernatant was measured by diphenylcarbazide ultraviolet spectrophotometry, and the change of chromium ion concentration within 60 minutes was measured to investigate the adsorption rate of chromium ions by microspheres prepared in different proportions.

[0019] The adsorption rate was calculated according to the following fo...

Embodiment 2

[0026] Fully dissolve sodium alginate and tannic acid in water according to the mass ratio of 1:1, then slowly drop it into the calcium chloride solution through a syringe, let it stand for 1 hour, filter out the microspheres and rinse several times with distilled water, and dry , to obtain sodium alginate / tannic acid microsphere adsorbent. The pH of the chromium ion solution was adjusted to 2-8 by NaOH solution and HCl solution, and 0.1 g of sodium alginate / tannic acid microspheres were added to 50 mL of 20ug / mL of the above-mentioned chromium ion water of different pH, at room temperature After 60 minutes, the supernatant was taken, and the concentration of chromium ions in the supernatant was measured by diphenylcarbazide ultraviolet spectrophotometry, and the change of chromium ion concentration was measured to investigate the adsorption rate of microspheres in different pH solutions to chromium ions.

[0027] The adsorption rate was calculated according to the following f...

Embodiment 3

[0034] Fully dissolve sodium alginate and tannic acid in water according to the mass ratio of 1:1, then slowly drop it into the calcium chloride solution through a syringe, let it stand for 1 hour, filter out the microspheres and rinse several times with distilled water, and dry , to obtain sodium alginate / tannic acid microsphere adsorbent. Add 0.1 g of prepared sodium alginate / tannic acid microspheres into 50 mL of chromium-containing ionized water with concentrations of 20 ug / mL, 40 ug / mL, 60 ug / mL, 80 ug / mL and 100 ug / mL, respectively , at room temperature, take the supernatant every ten minutes, measure the concentration of chromium ions in the supernatant by diphenylcarbazide ultraviolet spectrophotometry, and measure the change of chromium ion concentration within 60 minutes to investigate the concentration of chromium ions in different chromium ion concentration solutions The adsorption rate of microspheres to chromium ions.

[0035] The adsorption rate was calculated ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for rapidly reducing the concentration of heavy metal chromium ions in water. The method comprises the following steps: fully dissolving sodium alginate and tannic acidin water according to a mass ratio of 10: 1-1: 1, slowly dropwise adding the obtained solution into a calcium chloride solution through an injector, standing for 1 h, filtering out microspheres, washing the microspheres with distilled water several times, and drying to obtain a sodium alginate / tannic acid microsphere adsorbent; and adding a certain amount of the prepared sodium alginate / tannic acid microspheres into chromium-containing ionized water with the concentration of 20-100 mg / L, reacting for a certain time under the conditions of a certain temperature and a certain pH value, taking asupernatant, and testing the concentrations of chromium ions before and after adsorption. The purpose of reducing the concentration of chromium ions in water is achieved by using the prepared sodiumalginate / tannic acid microspheres. The method is simple and convenient to operate, quick and effective, and can effectively reduce the chromium ion concentration in water.

Description

technical field [0001] The invention belongs to the application field of environmental chemistry, in particular to a method for quickly removing heavy metal ions in water. Background technique [0002] Sodium alginate can be extracted from algae, and its content in sargassum is about 21%. It is a degradable, renewable and environmentally friendly green biomass material with wide sources and low price. [1] . The molecular chain of sodium alginate contains a large number of hydroxyl groups (-OH) and carboxyl groups (-COOH), which can provide active adsorption sites for the removal of metal ions when combined with tannic acid, and its modification by physical and chemical methods can improve Stability after forming microspheres [2] . Most of the currently prepared adsorption materials have slow adsorption rate and small adsorption capacity. Compared with them, sodium alginate / tannic acid microspheres have fast adsorption rate and better adsorption effect, and are more suitab...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C02F1/28B01J20/24B01J20/30B01J20/28C02F101/22
CPCB01J20/24B01J20/28019C02F1/286C02F2101/22
Inventor 徐晨于忠鹏孙婕邓宏玲
Owner CHANGCHUN UNIV OF TECH