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Perovskite type conductive ceramic membrane and preparation method and application thereof

A conductive ceramic and perovskite-type technology, which is applied in the field of water treatment conductive ceramic membrane preparation, can solve the problems of low mechanical strength, long service life, and unstable electrochemical performance of the conductive layer.

Pending Publication Date: 2022-07-01
BEIJING SINORICHEN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a perovskite-type conductive ceramic film and a preparation method thereof, which can effectively solve the problems of unstable electrochemical performance and conductive layer in the existing conductive ceramic film. The problem of low mechanical strength and service life

Method used

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  • Perovskite type conductive ceramic membrane and preparation method and application thereof
  • Perovskite type conductive ceramic membrane and preparation method and application thereof
  • Perovskite type conductive ceramic membrane and preparation method and application thereof

Examples

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Embodiment 1

[0033] A perovskite-type conductive ceramic film, the preparation method comprising the following steps:

[0034] (1) Preparation of perovskite-type conductive precursor powder: First, the nitrate solutions of chromium, lanthanum, cerium, strontium, and calcium are mixed in a molar ratio of 1:0.4:0.2:0.2:0.2 to prepare homogeneous nitrates solution, then put into the citric acid crosslinking agent with a molar ratio of 1.2:1.0 to the metal cation to form a homogeneous transparent solution, and then put into the ethylenediaminetetraacetic acid (EDTA) chelating agent with a molar ratio of 1.1:1.0 to the metal cation, and then The pH of the obtained precursor solution was adjusted to 7.0 with a volatile alkali (ammonia), mixed evenly, and heated and dehydrated in a water bath at 80°C. Finally, pulverize the dry gel and place it on a flat-panel electric furnace at 350 °C to burn and remove carbon to obtain a brown solid powder. Finally, grind the obtained brown powder to below 200...

Embodiment 2

[0039] The ratio of chromium, lanthanum, cerium, strontium, and calcium in the preparation of the perovskite-type conductive precursor powder in step (1) of Example 1 is adjusted to 1:0.4:0.1:0.3:0.2, and other conditions remain unchanged.

Embodiment 3

[0041] In the preparation of conductive ceramic powder in step (2) of Example 1, the mass ratio of conductive precursor to zirconia ceramic powder, binder and pore-forming agent was adjusted to 75wt%, 20wt%, 2wt% and 3wt%, and other Conditions remain unchanged.

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Abstract

The invention provides a perovskite type conductive ceramic membrane and a preparation method and application thereof, and the preparation method comprises the following steps: mixing nitrate solutions of chromium, lanthanum, cerium, strontium and calcium, sequentially adding a cross-linking agent and a chelating agent, adjusting the pH value to 7-8, heating and dehydrating the mixed solution to form xerogel, crushing the xerogel, and combusting to remove carbon, thereby obtaining the perovskite type conductive ceramic membrane. Then continuously grinding and annealing to prepare a lanthanum cerium strontium calcium chromate conductive ceramic precursor; then uniformly mixing the conductive ceramic powder with ceramic powder, a binder and a pore-forming agent, and carrying out ball milling treatment to prepare conductive ceramic fine powder; the conductive ceramic fine powder is placed in a mold, and a conductive ceramic blank is obtained through pressing in a vacuum compression molding and cold pressing mode; and calcining the prepared conductive ceramic blank in a high-temperature environment to prepare the perovskite conductive ceramic membrane. The conductive ceramic membrane can effectively solve the problems that an existing conductive ceramic membrane is unstable in electrochemical performance, low in mechanical strength of a conductive layer and short in service life.

Description

technical field [0001] The invention belongs to the technical field of preparation of conductive ceramic membranes for water treatment, and in particular relates to a perovskite type conductive ceramic membrane and a preparation method and application thereof. Background technique [0002] As a new type of high-efficiency separation technology, membrane technology has increasingly shown in recent years the advantages of low water quality requirements, less land occupation, and fewer environmental problems that traditional processes do not have. Ceramic membranes are usually made of Al 2 O 3 , ZrO 2 Inorganic membrane materials prepared by sintering and other metal oxides have the advantages of high temperature resistance, chemical corrosion resistance, good mechanical strength, strong anti-microbial ability, strong cleanability, long service life, etc. The typical refractory industrial wastewater treatment field has important application prospects. However, in the actual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D69/02C02F1/44C02F1/461C04B35/12C04B35/622C04B35/624C04B35/626C04B35/64C04B38/02C04B38/06
CPCB01D71/024C04B38/067C04B38/02C04B35/12C04B35/624C04B35/622C04B35/62615C04B35/64B01D69/02B01D67/0039C02F1/44C02F1/46109B01D2325/26B01D2325/24C02F2001/46133C04B2235/96C04B2235/602C04B2235/6581C04B2235/443C04B2235/449C04B2235/3244C04B2235/6562C04B2235/6567C04B2235/3826C04B2235/3873C04B38/007Y02E60/50
Inventor 张春晖吴盟盟肖楠张益臻童京华陈月
Owner BEIJING SINORICHEN ENVIRONMENTAL PROTECTION
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