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Method for removing metal lead ions in wastewater

A technology for metal lead and lead ions is applied in the field of removal of heavy metal ions in wastewater, which can solve problems such as difficulty in achieving satisfactory results, secondary pollution, and complicated operations, and achieve the effects of easy industrial amplification, high-dose adsorption, and simple operation.

Inactive Publication Date: 2018-11-13
SUZHOU BAIRUI BIOLOGICAL SCI & TECH CO LTD
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  • 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

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  • Method for removing metal lead ions in wastewater
  • Method for removing metal lead ions in wastewater

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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 to lead 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 lead ion solution with a concentration of 400 mg / L. Under the conditions of room temperature, 100 rpm and pH=5.0, adsorb for different times, and use a UV spectrophotometer to test the change of absorbance before and after adsorption, and calculate the adsorption amount of the adsorbent at different times according to the following formula.

[0029] q(t)=(C0-Ct)V / m

[0030] In the formula, q(t) represents the adsorption amount (mg / g) at time t; C0 and Ct represent the concentration of lead ions in the initial solution (mg / L), respectively, and the concentration of lead ions in the solution at time t (mg / L), And the lead ion concentration (mg / L) in the solution after adsorption; V and m represent the volume (L) of the lead ion s...

Embodiment 3

[0033] The test of adsorption isotherm comprises the following steps:

[0034] 10 mg of graphene microsphere adsorbent was accurately weighed with an electronic balance, and added to 20 mL of lead ion solution with a concentration range of 40-800 mg / L. Under the conditions of room temperature, 100 rpm and pH=5.0, 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 lead 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 lead ions in the solution until the adsorption reaches equilibrium. When the lead ion concentration is low, the adsorption amount of the adsorbent is less, which may be because at low concentration, the adsorption sites on the adsorbent are u...

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Abstract

The invention relates to a method for removing metal lead ions in wastewater. The method includes the steps: (1) preparing graphene micro-spheres; (2) adsorbing the lead ions from the wastewater by the graphene micro-spheres, and eluting the adsorbed lead ions; (3) testing the adsorbing capacity and the regeneration capacity of the lead ions. The method is simple, efficient, reusable and applicable to large-scale detection and removal of the metal lead ions in the wastewater.

Description

technical field [0001] The invention belongs to the application field of environmental chemistry, in particular to a method for 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, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/20B01J20/28C02F101/20
CPCB01J20/20B01J20/28021B01J20/28057C02F1/283C02F1/62C02F2101/20
Inventor 舒黎幼
Owner SUZHOU BAIRUI BIOLOGICAL SCI & TECH CO LTD