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Treatment method of Cu-EDTA heavy metal complex wastewater

A treatment method and technology for heavy metals, which are used in metallurgical wastewater treatment, processing wastewater treatment, textile industry wastewater treatment, etc., to achieve the effects of no secondary pollution, low energy consumption, and enrichment and recovery.

Active Publication Date: 2018-09-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the piezoelectric chemical effect to treat heavy metal complex wastewater

Method used

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  • Treatment method of Cu-EDTA heavy metal complex wastewater
  • Treatment method of Cu-EDTA heavy metal complex wastewater
  • Treatment method of Cu-EDTA heavy metal complex wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Preparation of barium titanate / graphene composite piezoelectric material

[0026] (1) Preparation of precursor H 2 TiO 3 .

[0027] Prepare 10 M NaOH solution, add 1.88g titanium dioxide (anatase) into 80mL prepared NaOH solution, stir evenly, transfer to 100mL polytetrafluoroethylene liner, and put it into a stainless steel reaction kettle. React at 180°C for 24h, take it out, and cool to room temperature to obtain a sample. Washed with ultrapure water, then soaked in 0.2 M HCl for 4 h to obtain H 2 TiO 3 sample. Then, take the sample out, add 50mL of ultrapure water to stir repeatedly, centrifuge (10000 rpm for 5 min) and wash four times, and finally dry it in a vacuum oven at 60°C for 12h;

[0028] (2) The precursor prepared in step (1) was subjected to a second hydrothermal reaction to prepare BaTiO 3 Piezoelectric material.

[0029] Precursor H 2 TiO 3 with Ba(OH) 2 .8H 2 O undergoes a hydrothermal reaction at a molar ratio of Ti:Ba=1:1. Reac...

Embodiment 2

[0031] Example 2 Heavy Metal Complex Degradation-Adsorption Experiment

[0032] Preparation of simulated heavy metal complex Cu-EDTA solution: Weigh 159.6mg of anhydrous copper sulfate, dissolve it in 1L of ultrapure water, and wait until it is completely dissolved; weigh 372mg of disodium edetate, dissolve it in 1L of ultrapure water in, until completely dissolved. Mix anhydrous copper sulfate and ethylenediaminetetraacetic acid disodium solution at a ratio of 1:1 and let it stand for more than 48 hours. Then the pH of the solution was adjusted to pH=5; the concentration of Cu-EDTA was 0.05 mmol / L.

[0033] Degradation experiment process:

[0034] (1) The barium titanate / graphene composite piezoelectric material (catalyst) prepared in Example 1 was added to 50 mL, 0.05 mmol / L Cu-EDTA solution, and the material dosage was 50 mg.

[0035] (2) Put the mixed solution in step (1) into a tank-type ultrasonic cleaning machine (power 100W, frequency 40kHz), take samples every 30mi...

Embodiment 3

[0048] Example 3 Heavy metal ion removal experiment

[0049] The experimental procedure of the degradation experiment is the same as that of the implementation case 2, and only the degradation experiment is extended to 3h, 4h, 5h and 6h. The adsorption experiment is consistent with the implementation case 2. After the experiment is completed, the Cu in the solution is detected. 2+ To determine the recovery rate of copper, the recovery rate is calculated as: the content of Cu in the effluent / the content of Cu in the influent. The relationship between different degradation experiment time and the recovery rate of Cu is as attached image 3 shown.

[0050] Depend on image 3 Visible: Prolonged reaction time, Cu 2+ The recovery rate was not significantly improved.

[0051] Depend on figure 2 image 3 It can be seen that the technology of the present application can realize the effective removal of Cu-EDTA heavy metal complexes and the recovery of heavy metal ions at the sam...

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Abstract

The application discloses a treatment method of Cu-EDTA heavy metal complex wastewater. The treatment method comprises the following steps: firstly, synthesizing a piezoelectric composite of barium titanate / graphene by a hydrothermal method; under pressure provided by ultrasonication, breaking down heavy metal complexation and degrading organic matter obtained after breakdown by virtue of the piezoelectric chemical effect of piezoelectric material; and further adsorbing and recovering free Cu<2+> or weak complex Cu<2+> by graphene in a solution obtained by breakdown and degradation, so as to effectively remove Cu-EDTA heavy metal complex wastewater. According to the application, by coupling the piezoelectric effect and the chemical process as well as the adsorption and electric desorptioneffects, the situation of high cost, cumbersome process, serious secondary pollution and secondary recovery of a traditional heavy metal wastewater treatment method is broken through, the effective removal of EDTA and the efficient recovery of Cu<2+> are implemented, the shortcomings of traditional technology are overcome, and as a green and efficient processing technology, the treatment method provides a new development direction for novel water treatment technology.

Description

technical field [0001] The invention relates to the technical field of industrial waste water resource treatment, in particular to the application of a Cu-EDTA waste water piezoelectric chemical treatment method. Background technique [0002] With the rapid development of industry and the acceleration of urbanization, more and more industrial and mining wastewater and domestic sewage are discharged directly without proper treatment, causing heavy metal pollution in water areas. Heavy metal ions can easily form complexes with cyanide, EDTA or organic matter. Traditional heavy metal ion treatment technologies generally adopt technologies such as adsorption, ion exchange, and neutralization precipitation to effectively remove them from the aqueous phase, and related processes have also been widely used in engineering applications. However, most complex heavy metal wastewater has high water solubility and can exist stably in a wide pH range. This type of wastewater is widely so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06H01L41/37C02F103/16C02F103/28C02F103/30H10N30/092
CPCC02F1/28C02F1/46C02F2103/28C02F2103/30C02F2103/16H10N30/092
Inventor 高冠道潘梅兰潘丙才
Owner NANJING UNIV
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