Method for removing methyl blue dye in wastewater

A methylene blue and dye technology, which is applied in the field of printing and dyeing sewage treatment, can solve the problems of incomplete contact, low adsorption capacity, insoluble in water, etc., and achieve the effects of reducing subsequent treatment steps, increasing effective contact, and excellent adsorption capacity

Inactive Publication Date: 2015-02-04
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These materials have shown a certain ability to adsorb methylene blue dye from the solution, but their adsorption capacity is not high. In actual operation, a large amount of adsorbents need to be invested to achieve a certain treatment effect, and it will bring a lot of difficult to handle. waste residue
Graphite and activated carbon materials are cheap and easy to obtain, but they are difficult to dissolve in water, and they are easy to float on the surface of the solution during the adsorption process. The contact with the methylene blue dye molecules is not comprehensive, and the active sites on the adsorbent cannot be fully utilized, resulting in poor removal efficiency
Magnetic composite materials are easy to recycle, but the preparation process of these materials is complex, the operation is cumbersome when applied to sewage treatment, electromagnetic equipment needs to be separated, and iron equipment needs to be avoided. Generally, the adsorption capacity is low and the cost performance is not high.

Method used

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  • Method for removing methyl blue dye in wastewater
  • Method for removing methyl blue dye in wastewater
  • Method for removing methyl blue dye in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 0.03mol of zinc nitrate to 100mL of deionized water for dissolving, and add 0.005mol of polyvinyl alcohol 1800, fully stir for 30 minutes to make it disperse evenly, adjust the pH value with dilute ammonia water to obtain a solution with a pH value of 7; The solution was placed in water at 80°C to react zinc nitrate with polyvinyl alcohol 1800 for 4 hours, then vacuum-dried at 80°C for 8 hours, and then calcined at 800°C for 4 hours to obtain white pure zinc oxide. Microscope picture as figure 1 shown, from figure 1 Visible, the pure zinc oxide that makes is the nano spherical particle that diameter is 20~50nm; The X-ray diffraction spectrogram of this pure zinc oxide nanoparticle is as follows figure 2 shown.

[0033] Prepare 50mL of 10mmol / L methylene blue aqueous solution in eight 100mL beakers, and use HCl and NaOH to adjust the pH of the solution so that the pH is 2, 3, 4, 4.5, 5, 6, 7, 9.5; Then add 0.05 g of the pure zinc oxide nanoparticles prepared in t...

Embodiment 2

[0035] Add 10 mol of zinc nitrate and 0.1 mol of aluminum nitrate into 1L of deionized water to dissolve, add 5 mol of polyethylene glycol 2000, stir well for 1 hour to disperse evenly, and obtain a solution; uniformly dissolve 20 mol of ammonium bicarbonate in the above solution , reacted at 20°C for 24 hours, dried the reaction product in vacuum at 70°C for 12 hours, and then calcined at 700°C for 2 hours to obtain a white zinc oxide-based material with a molar content of dopant aluminum of 1%. Its scanning electron microscope image is Figure 4 and Figure 5 shown, from Figure 4 and Figure 5 It can be seen that the prepared aluminum-doped zinc oxide-based material is a microtube composed of nanoparticles with a diameter of 20-30nm, the diameter of the microtube is 50-1000nm, and the length is 3-15μm. The X-ray diffraction spectrum of the microtube-based material is as follows Figure 6 shown.

[0036]Prepare 50mL of 2mmol / L methylene blue aqueous solution in five 100...

Embodiment 3

[0038] Add 10 mol of zinc nitrate and 1 mol of titanium nitrate into 1L of deionized water to dissolve, and add 2 mol of polyethylene glycol 2000, stir well for 1 hour to disperse evenly, and obtain a solution; add 1 mol / L sodium hydroxide solution dropwise evenly The above solution was reacted at 40°C for 5 hours, the reaction product was vacuum-dried at 40°C for 8 hours, and then calcined at 800°C for 6 hours to obtain a white zinc oxide-based material doped with 10% molar content of titanium.

[0039] Prepare 50mL of methylene blue aqueous solution in seven 100mL beakers with concentrations of 3mmol / L, 4mmol / L, 5mmol / L, 6mmol / L, 10mmol / L, 15mmol / L, 20mmol / L. Then 0.05 g of the titanium-doped zinc oxide-based material prepared in this example was added into these 7 beakers respectively. Magnetic stirring reaction at 50°C for 1 hour; after 30 minutes of natural sedimentation, take 5mL solution from the beaker with a syringe, filter out impurities with a 0.45 microliter needle...

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Abstract

The invention discloses a method for removing a methyl blue dye in wastewater. According to the method, zinc oxide or a doped zinc oxide base material is utilized as an adsorbing agent to remove the methyl blue dye in the wastewater. The raw materials adopted by the method are low in cost and easy to obtain, the reaction is quick and efficient, and the method is simple to operate; and the absorption quantity and removal rate of the methyl blue dye in the wastewater are high, the absorption quantity can reach 4-50mmol / g, the removal rate can reach 70-100%, and the method is suitable for industrial large-scale application.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing sewage treatment, and in particular relates to a method for removing methylene blue dye in sewage. Background technique [0002] It is a known technology in the technical field of printing and dyeing sewage treatment to remove dyestuffs in sewage by adsorption. At present, it has been reported that there are some materials used to remove methylene blue dye, such as the adsorption capacity of graphite to remove methylene blue reaches 1.90mmol / g (Chem.Eng.J.173(2011)144–149), and activated carbon has The adsorption amount of methylene blue is 0.000031mmol / g (J.Hazard.Mater.B139(2007)57-66), and the magnetic composite formed by chitosan and graphite oxide is used to adsorb methylene blue. The adsorption amount is 0.12mmol / g (J.Hazard.Mater.215–216 (2012) 272–279), the adsorption capacity of magnetic β-cyclodextrin-chitosan nanoparticles to methylene blue reached 3.48mmol / g (Int.J.Biol ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F1/28C02F103/30
Inventor 谭瑞琴宋伟杰张帆杨晔魏铁峰庄福强
Owner NINGBO UNIV
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