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Preparation method of Cr(VI) adsorbent and application thereof in waste water treatment

A technology of adsorbent and ultrapure water, which is applied in the field of preparation of high-efficiency adsorbent for target toxic metal ion Cr, can solve the problems of small adsorption capacity and high price, and achieve the effect of simple preparation method, low cost and excellent adsorption performance

Active Publication Date: 2015-02-25
南通市金宏电化设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used adsorbents generally have disadvantages such as low adsorption capacity or high price (such as activated carbon and other adsorbents). Therefore, a cost-effective adsorbent that can effectively react with the target toxic metal Cr(VI) is studied. It is of great significance to the treatment of Cr(Ⅵ)-containing wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the Cr(Ⅵ)-containing wastewater adsorbent is as follows:

[0023] Take 26.65 ml of concentrated sulfuric acid with a mass concentration of 98%, weigh 0.395 g of 1,8-naphthalene diamine (DAN) and 4.57 ml of aniline (AN), dissolve it in a 250 ml volumetric flask A, and dilute to volume with ultrapure water. Take 17.09 g of ammonium persulfate (APS) and dissolve it in ultrapure water, and put it in volumetric flask B of 250 ml. Transfer the solution from the two volumetric flasks into a beaker, and stir for 5 h under normal pressure at 5 °C. The resulting cloudy solution was filtered with a 0.22 μm filter membrane, washed with ultrapure water until it was colorless, and dried under vacuum at 60 °C for 12 h. , the obtained solid was ground to powder, and the high-efficiency Cr(Ⅵ) adsorbent was prepared with a yield of 37.61%.

Embodiment 2-3

[0025] The difference between Examples 2 and 3 and Example 1 is that different amounts of ammonium persulfate (APS) are used in the synthesis process of the high-efficiency Cr(VI) adsorbent, and the amounts of other raw materials and operating conditions are the same. The raw material ratio of embodiment 1-4 is shown in table 1.

[0026] Table 1

[0027] Example number n(APS):n(AN) Aniline (AN) amount / ml Amount of ammonium persulfate (APS) / g Amount of 1,8-naphthalene diamine (DAN) / g Yield / % 1 0.4:1 4.57 4.564 0.395 37.61 2 1.5:1 4.57 17.115 0.395 108.44 3 2.1:1 4.57 23.961 0.395 39.57

Embodiment 4

[0029] Influence of coexisting ions on adsorption effect

[0030] K + , Ca 2+ , SO 4 2- 、HCO 3 - , Cl - Plasma is a common ion in natural water bodies and industrial wastewater, and they can compete with toxic metal ions in water for active sites on the adsorbent. In a 10ml stoppered polypropylene tube, add 5mg of the obtained Cr(VI) adsorbent and 10ml of Cr(VI)-containing wastewater containing different concentrations of coexisting ions (the initial concentration of Cr(VI) is 10 mg / L, and the coexisting ions are K + , Ca 2+ , SO 4 2- 、HCO 3 - , Cl - , the concentration range is 2.5-30 mmol / L). Mix the solution in the tube evenly, fix it in a digital display constant temperature shaking incubator at 25.0±1.0°C and shake it at a speed of 150 r / min, take it out after 24 hours and quickly filter it with a cellulose acetate filter membrane with a pore size of 0.22 μm. The concentration of Cr(VI) in the filtrate was determined by flame atomic absorption spectrome...

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Abstract

The invention relates to a preparation method of Cr(VI) adsorbent and an application thereof in the waste water treatment, and belongs to the technical field of waste water treatment. The preparation method comprises the following steps: taking a certain amount of concentrated sulphuric acid with a mass concentration of 98%, 1,8-naphthalene diamine and aniline to make up to a constant volume with ultra pure water, dissolving a certain amount of ammonium persulfate oxidizing agent with ultra pure water, putting the two solutions in a beaker, reacting for 5 hours at 5 DEG C under the normal pressure while stirring to obtain a turbidity liquor, filtering the obtained turbidity liquor with a film of 0.22 micron and washing to colourless with ultra pure water, vacuum drying for 12 hours at 60 DEG C to obtain a solid, grinding the solid to powder to obtain the Cr(VI) adsorbent which can be used for removing Cr(VI) in the waste water. The adsorbent provided by the invention has the advantages of low cost, and is simple for preparation, the adsorptive property for toxic metal ion Cr(VI) under a complex environment is favorable so as to achieve the pollution control for the Cr(VI).

Description

Technical field: [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to the preparation and application of a high-efficiency adsorbent for target toxic metal ion Cr(VI). Background technique [0002] Chromium is a constituent element of the earth's crust. Under the effects of rock weathering and erosion, it can enter all environmental elements such as water, air, and soil from natural sources. At the same time, chromium enters the environment from wastewater discharged from human production activities such as electroplating, tanning, smelting, printing and dyeing, and pharmaceutical processes, causing chromium pollution. Chromium exists in water in different oxidation states (II, III, VI), among which Cr(VI) is highly toxic, and its toxicity is 300 times stronger than that of Cr(III). Cr(Ⅵ) has relatively strong chemical oxidizing properties, and it is easy to react with enzymes in the human body or biological system, causi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/22
Inventor 张文艺吴凌云邱小兰刘芳李定龙
Owner 南通市金宏电化设备有限公司
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