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Method for recycling heavy metals in electroplating wastewater by using modified titanium nanotube

A technology for titanium nanotubes and electroplating wastewater is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, and improvement of process efficiency, which can solve the problems affecting the capture efficiency of heavy metal ions and the limited exchange capacity of other transition metal ions. The effect of reducing emissions

Active Publication Date: 2014-03-19
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as domestic and foreign research results have shown, titanium nanotubes synthesized by conventional hydrothermal methods have a strong exchange ability for alkali metal ions, but have limited exchange ability for other transition metal ions, which will inevitably affect the ability of titanium nanotubes to heavy metal ions. Capture efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of modified titanium nanotubes: soak titanium nanotubes in excess absolute ethanol for 12 hours, and then dry at 60°C to obtain modified titanium nanotubes; it is tested that the amount of chromium adsorbed by each mole of modified titanium nanotubes is The adsorption capacity is about 0.8 moles;

[0029] The detection method for the adsorption capacity of the modified titanium nanotubes in this embodiment is: prepare a chromium nitrate solution, add the modified titanium nanotubes, and test the total chromium concentration before and after the addition.

[0030] (2) Treatment of chromium-containing ion plating wastewater:

[0031] (1) Wastewater pretreatment: adjust the pH value of chrome plating wastewater to 7 with sodium hydroxide, and filter to remove solid impurities;

[0032] (2) Heavy metal capture: Fill the above-mentioned modified titanium nanotubes into glass or stainless steel packed columns, and then introduce the electroplating wastewater ...

Embodiment 2

[0036] (1) Preparation of modified titanium nanotubes: soak titanium nanotubes in excess absolute ethanol for 48 hours, and then dry at 80°C to obtain modified titanium nanotubes; it is tested that the amount of copper adsorbed by each mole of modified titanium nanotubes is The capacity is about 0.8 moles;

[0037] The detection method for the adsorption capacity of the modified titanium nanotubes in this embodiment is: prepare a copper nitrate solution, add the modified titanium nanotubes, and measure the total copper concentration before and after the addition.

[0038](2) Treatment of chromium-containing ion plating wastewater:

[0039] (1) Wastewater pretreatment: adjust the pH value of copper plating wastewater to 2 with sodium hydroxide, and filter to remove solid impurities;

[0040] (2) Heavy metal capture: the above-mentioned modified titanium nanotubes are packed into glass or stainless steel packed columns, and then the electroplating wastewater pretreated in step ...

Embodiment 3

[0044] (1) Preparation of modified titanium nanotubes: soak titanium nanotubes in excess absolute ethanol for 36 hours, and then dry at 60°C to obtain modified titanium nanotubes; it is tested that per mole of modified titanium nanotubes absorbs nickel The capacity is about 0.8 moles;

[0045] The detection method for the adsorption capacity of the modified titanium nanotubes in this embodiment is as follows: a nickel nitrate solution is prepared, the modified titanium nanotubes are added, and the total nickel concentration before and after the addition is measured.

[0046] (2) Treatment of chromium-containing ion plating wastewater:

[0047] (1) Wastewater pretreatment: Use sodium hydroxide and 1mol / L dilute hydrochloric acid to adjust the pH value of nickel-plating wastewater to 5, and filter to remove solid impurities;

[0048] (2) Heavy metal capture: the above-mentioned modified titanium nanotubes are packed into glass or stainless steel packed columns, and then the ele...

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Abstract

The invention discloses a method for recycling heavy metals in electroplating wastewater by using a modified titanium nanotube. The method comprises the following steps: soaking a titanium nanotube in absolute ethyl alcohol for 12-48 hours, and drying at 60-80 DEG C to obtain the modified titanium nanotube; adjusting pH of electroplating wastewater to 2-7, and then carrying out settling separation or filtering to remove solid impurities; filling the modified titanium nanotube into a packing column, introducing the pretreated electroplating wastewater into the modified titanium nanotube packing column, and carrying out ion exchange till the titanium nanotube is saturated by adsorption; and putting the modified titanium nanotube which is saturated by adsorption into a sodium hydroxide aqueous solution, soaking for 6-18 hours, then filtering out the modified titanium tube, and drying the solution by distillation to obtain heavy metal substances. According to the method disclosed by the invention, the heavy metal ions in the electroplating wastewater are caught and then recycled by the modified titanium nanotube; the modified titanium nanotube which is used for multiple times can also be used as a denitration catalyst, which is favorable for emission reduction of nitric oxides and having multiple benefits.

Description

technical field [0001] The invention belongs to the field of electroplating wastewater treatment, and in particular relates to a method for recovering heavy metals in electroplating wastewater by using modified titanium nanotubes. Background technique [0002] The electroplating industry is one of the three major polluting industries in the world. my country's electroplating industry is currently developing rapidly, and there are about 10,000 electroplating factories nationwide. The electroplating industry produces about 4 billion m of wastewater every year 3 , causing serious environmental pollution problems, seriously restricting its sustainable development in our country. Electroplating wastewater contains nickel, copper, chromium, zinc, cadmium, silver and other heavy metal ions, which are difficult to biodegrade in the environment and easy to accumulate, so they can have long-term adverse effects on the environment and human health. How to completely eliminate the he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B7/00C02F103/16
CPCY02P10/20
Inventor 岑超平陈雄波曾文豪唐志雄方平陈定盛陈志航
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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