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Method for removing toxic heavy metal in water with modified nanometer titanium dioxide particle

A nano-titanium dioxide and heavy metal technology is applied in the field of lead, cadmium, toxic heavy metals, and efficient removal of copper in water bodies, achieving the effects of high practicability, economical operation, and huge adsorption capacity.

Inactive Publication Date: 2011-10-19
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the current problem of how to effectively remove copper, lead, and cadmium toxic heavy metals in industrial wastewater, thereby providing a low-cost, good removal effect, and environment-friendly method for removing high-concentration toxic heavy metals in industrial wastewater by using modified nano-titanium dioxide particles. Water treatment methods for heavy metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] First, put 20 g / ton of nano-titanium dioxide modified particles into the water body polluted by toxic heavy metals (including electroplating wastewater); then, fully mix the input nano-titanium dioxide modified particles with the polluted water for 30 minutes, and precipitate 2 Hours, after sedimentation, the treated sewage in the pool is discharged, leaving the nano-titanium dioxide modified particles adsorbed with toxic heavy metals; finally, the nano-titanium dioxide modified particles adsorbed with toxic heavy metals are transferred to the recovery pool, and added to the recovery pool 2mol / L hydrochloric acid solution, the volume ratio of hydrochloric acid solution to precipitate is 1:1; recover the toxic heavy metals desorbed from nano titanium dioxide modified particles.

[0010] The experimental results show that after precipitation, the concentration of copper, lead and cadmium in the raw water has been lower than the detection limit of the atomic absorption spec...

Embodiment 2

[0012] First, put 100 g / ton of nano-titanium dioxide modified particles into the water polluted by toxic heavy metals; then, fully mix the input nano-titanium dioxide modified particles with the polluted water for 60 minutes, and settle for 3 hours. The treated sewage in the pool is discharged, leaving the nano-titanium dioxide modified particles adsorbed with toxic heavy metals; finally, the nano-titanium dioxide modified particles adsorbed with toxic heavy metals are transferred to the recovery pool, and 6 mol / L of Hydrochloric acid solution, the volume ratio of hydrochloric acid solution to precipitate is 1:1; recover toxic heavy metals desorbed from nano titanium dioxide modified particles.

[0013] The experimental results show that after precipitation, the concentration of copper, lead and cadmium in the raw water has been lower than the detection limit of the atomic absorption spectrometer, which proves that the copper, lead and cadmium in the raw water have been complet...

Embodiment 3

[0015] First, put 60 g / ton of nano-titanium dioxide modified particles into the water polluted by toxic heavy metals; then, fully mix the input nano-titanium dioxide modified particles with the polluted water for 40 minutes, and settle for 3 hours. The treated sewage in the pool is discharged, leaving the nano-titanium dioxide modified particles adsorbed with toxic heavy metals; finally, the nano-titanium dioxide modified particles adsorbed with toxic heavy metals are transferred to the recovery pool, and 4 mol / L of Hydrochloric acid solution, the volume ratio of hydrochloric acid solution to precipitate is 1:1; recover toxic heavy metals desorbed from nano titanium dioxide modified particles.

[0016] The experimental results show that after precipitation, the concentration of copper, lead and cadmium in the raw water has been lower than the detection limit of the atomic absorption spectrometer, which proves that the copper, lead and cadmium in the raw water have been complete...

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Abstract

The invention discloses a method for removing toxic heavy metals in water with modified nanometer titanium dioxide particles. In the prior art, toxic heavy metals are removed by adding considerable basic materials, which results in waste of materials and increased cost in treating waste water. In the invention, modified nanometer titanium dioxide particles are added into and fully mixed with contaminated water, and the mixture is deposited to precipitate modified nanometer titanium dioxide particles which have absorbed toxic heavy metals; the precipitated modified nanometer titanium dioxide particles containing the toxic heavy metals are transferred to a recovery pond, and a dilute acid solution is added into the recovery pond to recover the toxic heavy metals desorbed from the modified nanometer titanium dioxide particles. The invention enables high efficient removal of high density toxic heavy metals in waste water on one hand and substantial reduction of the collecting volume of treating materials on the other hand and especially enables the usage of strong acid and strong base to be avoided, substantially saving cost.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method capable of efficiently removing copper, lead and cadmium toxic heavy metals in a water body without an alkalization process. Background technique [0002] Copper, lead, and cadmium are heavy metals widely used and discharged by modern industries. If the water body contains a certain amount of copper, lead, and cadmium elements, it is very toxic to organisms. If the human body and animals ingest excessive copper, lead, and cadmium toxic metal ions, it will cause damage to the internal organs of the human body and animals, and the metabolic system will be out of balance. , and the damage is irreversible, and it will kill humans and animals in severe cases. In my country, waste water from battery manufacturing, electroplating, leather and metallurgical industries generally contains high concentrations of toxic heavy metals such as copper, lead, and cadmium. The wastewater from ...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/28
Inventor 方婧
Owner ZHEJIANG GONGSHANG UNIVERSITY
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