Preparation method and applications for continuous silica-based waste adsorbent

A technology for adsorbents and waste materials, which is applied in the field of preparation of silicon-based waste continuous adsorbents, can solve the problems of lack of effective ways for the recovery of adsorbent materials and resource recycling, and achieve environmental protection of the process, enhanced removal capacity, and simple preparation process Effect

Inactive Publication Date: 2013-02-06
DALIAN UNIV OF TECH
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Problems solved by technology

The advantage of these materials is that the excellent characteristics of silicon-based materials are used to improve the adsorption perfo

Method used

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  • Preparation method and applications for continuous silica-based waste adsorbent
  • Preparation method and applications for continuous silica-based waste adsorbent
  • Preparation method and applications for continuous silica-based waste adsorbent

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[0015] Example 1:

[0016] The opal waste is activated and pretreated with hydrochloric acid with a concentration of 1-5 mol / L for 1-4 hours, and then sieved. The obtained adsorbent A is at 15°C, 20°C, and 30°C at a solid-liquid ratio of 1:1250. Mix well with 50mg / L crystal violet solution at 40℃ and 130rpm for 90min. Adsorbent A obtains a maximum adsorption capacity of 58.67mg / g at 30℃, and the waste after different heat treatments exhibits due to the changes in surface active hydroxyl groups. Different crystal violet adsorption performance, heat treatment 4h, with the increase of heat treatment temperature (300-700℃), the adsorption capacity decreases. Such as figure 2 Shown.

Example Embodiment

[0017] Example 2:

[0018] The opal continuous adsorbent B obtained by carbon fixation heat treatment at 250℃ is added to the heavy metal solution of Pb(Ⅱ), Ni(Ⅱ), Cr(Ⅵ) at a solid-to-liquid ratio of 1:1250, and stirred at 130rpm at room temperature Fully mixed, wherein the adsorbent B exhibits selective adsorption of Pb(Ⅱ), and the adsorption equilibrium is reached within 30 minutes. Under the same experimental conditions, when the concentration of heavy metals is 30mg / L, the maximum adsorption capacity of adsorbent B for Pb(Ⅱ), Ni(Ⅱ) and Cr(Ⅵ) at room temperature are 20.92mg / g and 1.13mg / g, respectively. g, 0.03mg / g (such as image 3 Shown); After adsorbing heavy metals, adsorbent B is eluted with 0.2mol / L hydrochloric acid solution, the recovery rate of Pb(Ⅱ) is 75%, and adsorbent B can be recycled.

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Abstract

The invention belongs to the field of resource recovery technique and relates to a preparation method and applications of a continuous silica-based waste adsorbent. The preparation method comprises the following steps: firstly carrying out activation pretreatment with hydrochloric acid for 1-4hours at 65-95 DEG C according to the solid-liquid ratio of (1:4)-(1:15) by utilizing waste material rich in silicon resources, leading the activated silica-based adsorbent material to adsorb molecules of organic matters with certain characteristic, carrying out carbon sequestration thermal treatment for 2-4hours at 200-350 DEG C to obtain the continuous silica-based waste adsorbent B, wherein the mass percentage of the thermal treatment oxygen is 0.1%-21%. Heavy metal is bound from the waste water and then desorbed with hydrochloric acid, the heavy metal is accumulated into water, and the recycled absorbent is used for adsorbing organic matters again, in this way, the recycling is carried out. The continuous adsorbent has selective accumulation capability on heavy metal Pb, the preparation method is simple, environment-friendly in technique, can realize maximum resource utilization of the silica-base wastes while the secondary pollution is avoided, thereby palying a positive role in treating the waste water.

Description

technical field [0001] The invention belongs to the field of resource utilization and recovery of environmental waste, and relates to a preparation method and application of a silicon-based waste continuous adsorbent. technical background [0002] In recent years, due to the rapid development of urbanization and industrialization, industrial and agricultural waste and urban domestic waste have increased dramatically, dyes, paints, pesticides, and fertilizers have been mass-produced, and a large amount of industrial wastewater has poured into rivers. The global environment is deteriorating, especially human beings. The living water environment has been seriously polluted by organic matter and heavy metals, and it is intensifying, which has brought a bad impact on the social economy and people's lives. At present, the world's water resources are already seriously scarce. Therefore, how to effectively treat organic wastewater and heavy metal wastewater has become a major probl...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 马伟宋小燕王刃徐军程子洪吕腾飞
Owner DALIAN UNIV OF TECH
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