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Preparation method of tannic acid-Zr (IV) hybrid membrane for treating wastewater containing heavy metals

A tannic acid, hybrid membrane technology, applied in chemical instruments and methods, water/sludge/sewage treatment, osmotic/dialysis water/sewage treatment, etc., can solve high operating costs, high energy consumption, membrane fouling, etc. The problem is to achieve the effect of simple preparation method, efficient adsorption capacity and strong adsorption capacity.

Active Publication Date: 2022-07-29
NANJING UNIV OF INFORMATION SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polymer microfiltration membranes for general water treatment are based on the pore size sieving effect, which often have no selective separation effect on toxic heavy metal ions and other pollutants; while reverse osmosis membranes with the typical ability to separate heavy metal ion pollutants are in the process of operation. There are often problems such as membrane fouling, high operating costs and high energy consumption.

Method used

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  • Preparation method of tannic acid-Zr (IV) hybrid membrane for treating wastewater containing heavy metals

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Embodiment 1

[0026] The present embodiment provides a method for preparing a tannic acid-Zr(IV) hybrid film, comprising the following steps:

[0027] Step S1: Disperse the capacitive carbon powder in deionized water, configure it into a 0.5 g / L capacitive carbon aqueous solution, and continuously sonicate for 120 min in a 120 Hz ultrasonic cleaning machine to make it evenly dispersed to obtain a capacitive carbon aqueous dispersion.

[0028] Step S2, use zirconium oxychloride octahydrate to prepare 3mM Zr(IV) solution, use tannic acid to prepare 2mM tannic acid solution, the background ions are all 1M NaCl, mix the two solutions in equal proportions, and adjust the mixing The pH of the solution was adjusted to 9 to obtain a tannic acid-Zr(IV) mixed solution.

[0029] Step S3: Measure 1.6 mL of the capacitor carbon water dispersion and 1.5 mL of the tannic acid-Zr(IV) mixed solution, and use a vortex mixer to mix the two solutions at a vortex speed of 1200 rpm for 30 min to mix them. evenl...

Embodiment 2

[0037]This embodiment provides a method for preparing a tannic acid-Zr(IV) hybrid film. In this embodiment, the volumes of the capacitive carbon aqueous solution in step S3 of Example 1 are replaced by 2, 1.8, 1.6, 1.2, and 1, respectively. , 0.8, 0.4, 0.2, 0 mL, and the volume of the tannic acid-Zr(IV) mixed solution was correspondingly replaced by 0, 0.75, 1.5, 3, 3.75, 4.5, 6, 6.75, 7.5 mL. With other steps unchanged, tannins with different tannin-Zr(IV) contents (0%, 10%, 20%, 40%, 50%, 60%, 80%, 90%, 100%) were obtained- Zr(IV) hybrid films, and the film weights were all 0.007 g.

[0038] The pure water flux was tested on the tannic acid-Zr(IV) hybrid membranes with different tannic acid-Zr(IV) contents in this example, and the specific method was as follows: the different tannic acid-Zr The tannic acid-Zr(IV) hybrid membrane with the content of (IV) was placed in the filtration device, the pressure was kept constant, the time required to filter the same volume of pure w...

Embodiment 3

[0043] In this example, the pH of the tannic acid-Zr(IV) mixed solution in step S2 of Example 1 was adjusted to 7, 8, and 9, respectively. The other steps were unchanged, and the tannic acid-Zr(IV) hybrid film was obtained. The performance of the tannic acid-Zr(IV) hybrid membrane obtained in this example for adsorbing Pb(II) was evaluated, and the specific method was as follows:

[0044] Pb(II) solutions of 50, 100, 200, 400, 800, and 1000 ppm were prepared respectively, and the tannic acid-Zr(IV) hybrid membrane was installed on the filter device, and 10 mL of Pb(II) solution of corresponding concentration was taken, After rapid filtration, the concentration of Pb(Ⅱ) in the solution before and after purification was measured by flame atomic absorption method, and the adsorption capacity of each hybrid membrane was calculated.

[0045] The results show that the co-deposition of tannic acid-Zr(IV) endows the surface of the hybrid membrane with strong electronegativity, which ...

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Abstract

The invention provides a preparation method of a tannic acid-Zr (IV) hybrid membrane for treating wastewater containing heavy metals, and the method comprises the following steps: dispersing powdery capacitance carbon in deionized water, and carrying out ultrasonic treatment to uniformly disperse the powdery capacitance carbon to obtain a capacitance carbon aqueous dispersion; the preparation method comprises the following steps: mixing a Zr (IV) solution and a tannic acid solution in a certain ratio in a 1M NaCl aqueous solution, and adjusting the pH value to 7-9 to obtain a tannic acid-Zr (IV) mixed solution; the preparation method comprises the following steps: weighing a certain amount of a capacitor carbon aqueous dispersion and a tannic acid-Zr (IV) mixed solution, uniformly mixing the two solutions under vortex by using a vortex mixer, and carrying out vacuum filtration to the surface of a hydrophilic polymer microfiltration membrane to obtain the tannic acid-Zr (IV) hybrid membrane. The tannic acid-Zr (IV) hybrid membrane is wide in material source, simple in preparation method and low in cost, and the tannic acid-Zr (IV) hybrid membrane prepared by the method can selectively adsorb Pb (II) under the competition of coexisting cations Ca (II), has a very high partition coefficient and far exceeds that of commercial ion exchange resin. Meanwhile, the adsorption performance is excellent.

Description

technical field [0001] The invention relates to the field of separation membrane preparation, in particular to a preparation method of a tannic acid-Zr(IV) hybrid membrane for treating heavy metal-containing wastewater. Background technique [0002] Traditional methods of removing heavy metals from water (chemical precipitation, electrodialysis, ion exchange) face economic or environmental constraints due to high implementation costs, and often require additional processes to eliminate secondary products, as well as specific operations conditions to ensure purification efficiency. As a new and efficient water treatment technology, membrane separation technology has many advantages such as high separation efficiency, no secondary pollution and small footprint, so it is widely used in the treatment of industrial wastewater, printing and dyeing wastewater and domestic sewage. However, the general polymer microfiltration membrane for water treatment is based on the pore size sc...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/56B01D71/34B01D71/10B01D67/00C02F1/44C02F101/20
CPCB01D71/68B01D71/56B01D71/34B01D71/10B01D67/0079C02F1/44C02F2101/20
Inventor 邱慧倪文翔张加康方昊陈凯陈鑫若
Owner NANJING UNIV OF INFORMATION SCI & TECH