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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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 performance. The disadvantage is that there is no effective way for the recovery and resource recycling of adsorbent materials after adsorption.

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

Examples

Experimental program
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Effect test

Embodiment 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. and 40°C with 50mg / L crystal violet solution at a speed of 130rpm for 90min, the adsorbent A obtained the maximum adsorption capacity of 58.67mg / g at 30°C, and the wastes after different heat treatments showed the following changes due to the change of surface active hydroxyl groups Different crystal violet adsorption properties, heat treatment for 4 hours, with the increase of heat treatment temperature (300-700 ℃), the adsorption amount decreases. Such as figure 2 shown.

Embodiment 2

[0018] The opal continuous adsorbent B obtained by carbon fixation heat treatment at 250°C was added to the heavy metal solution of Pb(II), Ni(II) and Cr(VI) at a solid-liquid ratio of 1:1250, and the stirring speed was 130rpm at room temperature Mix well, and the adsorbent B exhibits selective adsorption to Pb(II), reaching adsorption equilibrium within 30min. Under the same experimental conditions, when the heavy metal concentration was 30 mg / L, the maximum adsorption capacity of adsorbent B for Pb(II), Ni(II), and Cr(VI) at room temperature were 20.92 mg / g, 1.13 mg / g, respectively. g, 0.03mg / g (such as image 3 shown); the adsorbent B after adsorbing heavy metals is eluted with 0.2mol / L hydrochloric acid solution, the recovery rate of Pb(II) is 75%, and the 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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