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Method of utilizing nano titanium dioxide to remove mercury ions in wastewater

A technology of nano-titanium dioxide and mercury ions, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as difficult to meet discharge standards, secondary pollution, high operating costs and raw material costs, and achieve non-existent Secondary pollution, low cost, and the effect of solving relatively high operating costs and raw material costs

Active Publication Date: 2015-12-02
SOUTHWEST UNIVERSITY
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Problems solved by technology

Traditional treatment methods have a common disadvantage in treating mercury-containing wastewater, that is, the operating costs and raw material costs are relatively high when used to treat wastewater with a mercury concentration of 1-100mg / L, it is difficult to meet the new discharge standards, and there are secondary pollution problems

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  • Method of utilizing nano titanium dioxide to remove mercury ions in wastewater
  • Method of utilizing nano titanium dioxide to remove mercury ions in wastewater
  • Method of utilizing nano titanium dioxide to remove mercury ions in wastewater

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with specific embodiments.

[0030] 3 kinds of anatase phase TiO 2 Powder: the average particle size is 5nm, 25nm and 100nm, respectively, and the purity is greater than 99.8%. The first two particles are purchased from Hangzhou Wanjing New Nano Technology Co., Ltd., and the last particle is purchased from Aladdin Reagent Company. The morphology was characterized by transmission electron microscopy (TEM), and the results were as follows: figure 1 -As shown in A, B, and C, X-ray diffraction (XRD) analysis of the crystal form of the three particles shows the results as follows figure 2 shown.

[0031] Prepare simulated mercury-containing wastewater according to GB / T602-2002 "Preparation of Standard Solutions for Determination of Impurities in Chemical Reagents": Weigh 1.35g of mercuric chloride, dissolve it in water, transfer it into a 1000mL volumetric flask, and dilute to the mark. Other ...

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Abstract

The invention provides a method of utilizing nano titanium dioxide to remove mercury ions in wastewater. The method includes: adding nano titanium dioxide into mercury-containing wastewater; adjusting pH value of the wastewater to 3-8 to enable nano titanium dioxide to remove the mercury ions in the wastewater through adsorption action. Grain diameter of nano titanium dioxide is one of 100nm, 5nm and 25nm, and optimal adding quantity of nano titanium dioxide is 2.0g.L-1 for nano titanium dioxide of 100nm in grain diameter, 7.5g.L-1 for nano titanium dioxide of 5nm in grain diameter or 10.0g.L-1 for nano titanium dioxide of 25nm in grain diameter. An optimal scheme includes that solution pH is equal to 8.0, adding quantity of TiO2 of 100nm is 2.0g.L-1, concentration of initial Hg2+ is 25g.L-1, and adsorption is performed for 10 minutes. Under the condition, Hg (II) removal rate is 99.9%.

Description

technical field [0001] The invention belongs to the technical field of application of nanometer materials and treatment of wastewater containing heavy metals, and in particular relates to a method for removing mercury ions in wastewater by using nanometer titanium dioxide. Background technique [0002] Mercury is a common heavy metal pollutant with the characteristics of high toxicity, refractory degradation and bioaccumulation, which can easily cause damage to the cardiovascular, kidney, gastrointestinal and central nervous systems. Mercury is used in many industries, such as mining, petrochemical, metallurgy and electrical, which greatly increases the amount of wastewater. Commonly used methods for removing mercury in wastewater include chemical precipitation, ion exchange, membrane filtration, adsorption, etc. Among them, adsorption is simple to operate, low in cost, good in removal effect, and has many sources of adsorbents, so it is widely used. Traditional treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/06
Inventor 王定勇张金洋周雄张成王永敏马明
Owner SOUTHWEST UNIVERSITY
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