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

Method for rapidly absorbing heavy metal chromium ions in wastewater

A technology for chromium ions and heavy metals, applied in the field of rapid removal of heavy metal ions in wastewater, can solve the problems of difficult to achieve satisfactory results, secondary pollution, complicated operation, etc., and achieve the effect of easy industrial scale-up, high-dose adsorption, and simple operation

Inactive Publication Date: 2018-11-23
SUZHOU BAIRUI BIOLOGICAL SCI & TECH CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional treatment methods mainly include ion exchange, precipitation and electrolysis, but these methods are costly, complicated to operate and often cause secondary pollution, making it difficult to achieve satisfactory results

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 absorbing heavy metal chromium ions in wastewater
  • Method for rapidly absorbing heavy metal chromium ions in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of graphene microsphere adsorbent comprises the steps:

[0025] Ultrapure water was added to graphene oxide to prepare a graphene oxide solution with a mass concentration of 8 wt.%, and the solution was placed in an ultrasonic atomizer connected to a tube furnace with an ultrasonic frequency of 1.5 MHz. Make it atomized into aerosol droplets, and slowly pass through a tube furnace heated to 400°C under the drive of N2 and a filter vacuum pump, and collect it with a 0.22 um PTFE filter membrane at the end. Dry at room temperature for 8 hours to obtain the graphene microsphere adsorbent, and the particle size of the graphene microspheres prepared by the present invention is about 5 um.

Embodiment 2

[0027] The adsorption experiment of graphene microsphere adsorbent on chromium ion under different time, including the following steps

[0028] 10 mg of graphene microsphere adsorbent was accurately weighed with an electronic balance, and added to 20 mL of chromium ion solution with a concentration of 400 mg / L. Under the conditions of room temperature, 100 rpm and pH=6.0, adsorb for different times, and then centrifuge at 10000 rpm for 8 minutes,

[0029] And use the ultraviolet spectrophotometer to test the change of its absorbance before and after adsorption, and calculate the adsorption amount of the adsorbent at different times according to the following formula.

[0030] q(t)=(C0-Ct)V / m

[0031] In the formula, q(t) represents the adsorption amount (mg / g) at time t; C0 and Ct represent the chromium ion concentration (mg / L) in the initial solution respectively, and the chromium ion concentration (mg / L) in the solution at time t, And the chromium ion concentration (mg / L) ...

Embodiment 3

[0034] The test of adsorption isotherm comprises the following steps:

[0035] Accurately weigh 10 mg of graphene microsphere adsorbent with an electronic balance, and add it to 20 mL of chromium ion solution with a concentration range of 40-800 mg / L. Under the conditions of room temperature, 100 rpm and pH=6.0, adsorb for 120 min, and use a UV spectrophotometer to test the change of absorbance before and after adsorption, so as to calculate the concentration of residual chromium ions in each solution, draw the adsorption isotherm, and test The maximum adsorption capacity of graphene microspheres, see figure 2 . It can be seen from the figure that the adsorption capacity of the adsorbent increases with the increase of the concentration of chromium ions in the solution until the adsorption reaches equilibrium. When the concentration of chromium ions is low, the adsorption capacity of the adsorbent is less, which may be because at low concentrations, the adsorption sites on t...

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

PropertyMeasurementUnit
massaaaaaaaaaa
concentrationaaaaaaaaaa
adsorption capacityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for rapidly absorbing heavy metal chromium ions in wastewater. The method comprises the following steps: (1) preparing graphene microspheres; (2) absorbing the chromium ions from the wastewater by using the graphene microspheres, and carrying out elution on the chromium ions after absorption; (3) measuring the absorption amounts of the chromium ions before and after absorption. The method is simple and efficient, can be repeatedly used, and is suitable for large-scale detection and rapid removal of the heavy metal chromium ions in the wastewater.

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 waste water. Background technique [0002] Graphene, as a new carbonaceous material, has attracted extensive attention since its discovery due to its unique two-dimensional single atomic layer structure. Due to its large specific surface area and large π-conjugated structure, graphene has the potential to be used as an adsorbent with high adsorption capacity and can be applied to adsorb heavy metal ions in wastewater. However, graphene flakes are prone to stacking in solid state and agglomeration in solution, which not only reduces the stability of the solution, but also reduces its effective specific surface area and its adsorption capacity. At the same time, due to the different sizes of graphene sheets, even under high-speed centrifugation, small sheets of graphene are difficult to separate from the solution,...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/20B01J20/28002B01J20/28021B01J20/28057C02F1/281C02F2101/22
Inventor 舒黎幼
Owner SUZHOU BAIRUI BIOLOGICAL SCI & TECH CO LTD