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High-activity photochromic bismuth oxychloride/calcium alginate photocatalytic hydrogel microbead and preparation method thereof

A technology of hydrogel microbeads and photochromism, applied in chemical instruments and methods, light water/sewage treatment, physical/chemical process catalysts, etc., can solve problems such as difficult recycling, difficult reuse, and large losses. Achieve the effects of good photochromic properties, good spherical shape, and enhanced photocatalytic efficiency

Active Publication Date: 2021-07-13
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, traditional photocatalysts are dispersed in a solution as a granular powder, which has problems such as easy agglomeration, difficulty in recycling, difficulty in reusing, and large loss. Utilization has the advantages of renewability, large output, and biodegradability. The natural polymer sodium alginate is used as raw material, and the microsphere material loaded with photocatalytic functional powder has a good application prospect in the field of environmental purification, and realizes the purpose of easy recovery, recyclable utilization and reduction of powder loss.

Method used

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  • High-activity photochromic bismuth oxychloride/calcium alginate photocatalytic hydrogel microbead and preparation method thereof
  • High-activity photochromic bismuth oxychloride/calcium alginate photocatalytic hydrogel microbead and preparation method thereof
  • High-activity photochromic bismuth oxychloride/calcium alginate photocatalytic hydrogel microbead and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of Ca-BOC-SA mixed colloids. 1g of CaCO 3 Dissolve 0.4g of BiOCl powder in deionized water, stir to prepare Ca-BOC mixed suspension after ultrasonic dispersion, then add 0.4g of SA powder into Ca-BOC mixed suspension, stir magnetically for 1h until completely dissolved, and prepare into Ca-BOC-SA mixed colloid.

[0023] (2) Prepare a mixed solution of calcium chloride and glacial acetic acid. Weigh 1g CaCl 2 In a 100mL beaker, add 5mL of deionized water, stir the glass rod until it is completely dissolved, then add 45mL of glacial acetic acid to prepare a mixed solution of calcium chloride and glacial acetic acid with a volume ratio of 9:1.

[0024] (3) To prepare BOC-CA hydrogel, drop the Ca-BOC-SA mixed colloid into the mixed solution of calcium chloride and glacial acetic acid from a height of about 25 cm on the liquid surface with a dropper with a diameter of about 5 cm, and use it after reacting for 2 hours. Soak in deionized water for 48 hours,...

Embodiment 2

[0032] (1) Preparation of Ca-BOC-SA mixed colloids. 1g of CaCO 3 Dissolve 0.06g of BiOCl powder in deionized water, stir after ultrasonic dispersion to prepare Ca-BOC mixed suspension, then add 0.4g of SA powder into Ca-BOC mixed suspension, stir magnetically for 1h until completely dissolved, and prepare into Ca-BOC-SA mixed colloid.

[0033] (2) Prepare a mixed solution of calcium chloride and glacial acetic acid. Weigh 1g CaCl 2 In a 100mL beaker, add 5mL of deionized water, stir the glass rod until it is completely dissolved, then add 45mL of glacial acetic acid to prepare a mixed solution of calcium chloride and glacial acetic acid with a volume ratio of 9:1.

[0034] (3) To prepare BOC-CA hydrogel, drop the Ca-BOC-SA mixed colloid into the mixed solution of calcium chloride and glacial acetic acid from a height of about 25 cm on the liquid surface with a dropper with a diameter of about 5 cm, and use it after reacting for 2 hours. Soak in deionized water for 48 hours...

Embodiment 3

[0038] (1) Preparation of Ca-BOC-SA mixed colloids. 1g of CaCO 3 Dissolve 0.2g of BiOCl powder in deionized water, stir to prepare Ca-BOC mixed suspension after ultrasonic dispersion, then add 0.4g of SA powder into Ca-BOC mixed suspension, stir magnetically for 1h until completely dissolved, and prepare into Ca-BOC-SA mixed colloid.

[0039] (2) Prepare a mixed solution of calcium chloride and glacial acetic acid. Weigh 1g CaCl 2 In a 100mL beaker, add 5mL of deionized water, stir the glass rod until it is completely dissolved, then add 45mL of glacial acetic acid to prepare a mixed solution of calcium chloride and glacial acetic acid with a volume ratio of 9:1.

[0040] (3) To prepare BOC-CA hydrogel, drop the Ca-BOC-SA mixed colloid into the mixed solution of calcium chloride and glacial acetic acid from a height of about 25 cm on the liquid surface with a dropper with a diameter of about 5 cm, and use it after reacting for 2 hours. Soak in deionized water for 48 hours,...

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Abstract

The invention discloses a high-activity photochromic bismuth oxychloride / calcium alginate photocatalytic hydrogel microbead and a preparation method thereof. The bismuth oxychloride / calcium alginate (BOC-CA for short) hydrogel microbead is prepared by a sol-gel method. According to the hydrogel microbead, flaky BiOCl is uniformly loaded on the surface and in an internal network structure of the CA hydrogel microbead, the diameter is 6-7 mm, the sphericity degree reaches 98.3%, and the average water content is 95.2%. The BOC-CA hydrogel microbead has better ultraviolet light catalytic response, photochromic property and capability of recycling and cyclically degrading rhodamine B (RhB), can achieve the effect of completely degrading RhB within 75 minutes under the condition of ultraviolet light irradiation, and shows the trend of performance enhancement after being cyclically degraded for multiple times. The microbead becomes black from white under ultraviolet irradiation, and the color of the microbead can be recovered to an initial state after standing for a period of time. The method for fixing the BiOCl photocatalyst by using the gel microbeads provides a practical and effective way for solving the problem of recovery of a powder photocatalyst material.

Description

technical field [0001] The invention belongs to the field of chemical material preparation, and specifically relates to a highly active photochromic BOC-CA photocatalytic hydrogel microbead and a preparation method thereof. The material is prepared by a sol-gel method, and is used in photocatalytic degradation treatment of industrial wastewater and Powder recovery has a very important use. Background technique [0002] Photocatalytic technology is a new type of green redox technology, which is widely used in the removal of refractory organic matter in water bodies. In recent years, traditional photocatalysts are dispersed in a solution as a granular powder, which has problems such as easy agglomeration, difficulty in recycling, difficulty in reusing, and large loss. Utilization has the advantages of regeneration, large output, and biodegradability. The natural polymer sodium alginate is used as the raw material, and the microsphere material loaded with photocatalytic functi...

Claims

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Application Information

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IPC IPC(8): B01J31/06C02F1/32C02F101/38
CPCB01J31/069C02F1/32C02F2305/10C02F2101/38B01J35/23B01J35/39Y02W10/37
Inventor 赵巍熊德智郭晶晶李世博叶瑶佘凯翔
Owner TIANJIN CHENGJIAN UNIV
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