Pompom-shaped zinc oxide/graphene composite adsorbent and its preparation method and application

A graphene composite and zinc oxide technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal compounds, etc., can solve problems such as easy secondary stacking, and achieve enhanced mechanical and chemical stability performance, ease of recycling and reuse, and improved stability

Inactive Publication Date: 2019-04-12
北京清淞泉生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When graphene is used alone, secondary stacking easily occurs between graphene nanosheets due to its extremely high surface energy and large surface area, which has become a bottleneck limiting its large-scale application.

Method used

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  • Pompom-shaped zinc oxide/graphene composite adsorbent and its preparation method and application
  • Pompom-shaped zinc oxide/graphene composite adsorbent and its preparation method and application
  • Pompom-shaped zinc oxide/graphene composite adsorbent and its preparation method and application

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preparation example Construction

[0027] A preparation method of fluffy zinc oxide / graphene composite adsorbent, comprising the following steps:

[0028] A, using graphite as a raw material, adopting the Hummer method to synthesize graphene oxide, dispersing the prepared graphene oxide into an aqueous solution to form a stable graphene oxide suspension;

[0029] B, dissolving the metal zinc salt in the graphene oxide suspension obtained in step A; then weighing a certain amount of sodium tartrate and adding it to obtain the graphene oxide suspension containing the metal zinc salt;

[0030] C, configure a precipitant solution with a molar concentration of 0.05 M ~ 4 M, and add it dropwise to the graphene oxide suspension containing metal zinc salt obtained in step B under stirring conditions of 500 rpm ~ 2000 rpm middle;

[0031] D, transfer the suspension obtained in step C into a polytetrafluoroethylene liner, react for 6 h to 72 h under 90 ° C ~ 180 ° C hydrothermal conditions, naturally cool to room temperat...

Embodiment 1

[0039] Accurately weigh 0.1 g of graphene oxide prepared by the Hummer method, and ultrasonically disperse it in 60 mL of aqueous solution to form suspension A; accurately weigh 0.001 mol of zinc nitrate hexahydrate and dissolve it in suspension A, the concentration of zinc salt Accurately weigh sodium tartrate according to the molar ratio of sodium tartrate to metal zinc salt of 1:15, dissolve it in suspension A, and form suspension B after ultrasonic dispersion for 3 minutes; prepare another 20 mL The hexamethylenetetramine solution with a concentration of 0.5 M was added dropwise to the suspension B under the stirring condition of 500~2000 rpm, and the reaction was carried out under 120 °C hydrothermal condition for 24 hours after the addition was completed. , naturally cooled to room temperature after the reaction, suction filtered and washed to obtain a fluffy zinc oxide / graphene composite adsorbent. Among them, the mass percentage of zinc oxide is 42%. The pompom-shaped ...

Embodiment 2

[0042] Accurately weigh 0.1 g of graphene oxide prepared by the Hummer method, and ultrasonically disperse it in 60 mL of aqueous solution to form suspension A; accurately weigh 0.001 mol of zinc chloride and dissolve it in suspension A, the concentration of zinc salt is 0.0167 M, and then accurately weigh sodium tartrate according to the molar ratio of sodium tartrate to metal zinc salt of 1:15, dissolve it in suspension A, and form suspension B after ultrasonic dispersion for 3 minutes; another 20 mL The urea solution with a concentration of 1 M is added dropwise to the suspension B under the stirring condition of 500~2000 rpm, and reacted under 180 °C hydrothermal conditions for 6 hours after the addition is completed, and naturally cooled after the reaction to room temperature, suction filtration and washing to obtain a fluffy zinc oxide / graphene composite adsorbent. Among them, the mass percentage of zinc oxide is 39%. The pompom-shaped ZnO nano / microstructure is composed...

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Abstract

The invention discloses a fluff-sphere-shaped zinc oxide / graphene composite adsorbent as well as a preparation method and an application thereof. By adopting a hydrothermal method, utilizing sodium tartrate as a morphological control agent, taking urea or hexamethylenetetramine as a precipitant and utilizing an alkaline environment produced by the precipitant under the high-temperature condition, graphene oxide is chemically reduced into graphene, meanwhile, in-situ deposition and growing of fluff-sphere-shaped zinc oxide particles on the surface of graphene are realized, the composite adsorbent which is high in specific surface area and realizes highly uniform dispersion of the fluff-sphere-shaped zinc oxide particles on the surface of graphene is obtained, and an open type porous fluff-sphere-shaped nano / microstructure unit of one-dimensional zinc oxide is formed by the aid of sodium tartrate, so that abundant pore structures and adsorption locations are formed; recovery, treatment and reutilization of the composite adsorbent are facilitated on the basis of the high specific surface area, higher mechanical strength and chemical stability of graphene; the composite adsorbent has a good adsorption effect on heavy metal ions such as Hg<2+>, Pb<2+>, As <3+>, Cr<6+> and Cd<2+> and has broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of adsorbent preparation, and in particular relates to a pompom-shaped zinc oxide / graphene composite adsorbent and a preparation method and application thereof. Background technique [0002] With the rapid development of industry and the acceleration of urbanization, a large amount of industrial and mining sewage such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation is directly discharged without proper treatment, causing serious environmental heavy metal pollution. Heavy metal pollution is mainly manifested in water pollution, and part of it is manifested in air and solid waste. Since heavy metals can migrate among the three, it is easy to cause indirect pollution of various environmental elements. Heavy metal water pollution is different from other types of water pollution. Because heavy metal pollution cannot be degraded by the environment, it can only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28C02F1/28C02F1/62
CPCB01J20/06B01J20/20B01J20/28019B01J2220/42B01J2220/4806B01J2220/4812C02F1/28C02F1/281C02F1/283C02F2101/103C02F2101/20C02F2101/22
Inventor 曹明范国利宛楠曹飞雷远
Owner 北京清淞泉生物科技有限公司
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