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Adsorbent for removing hexavalent chromium in drinking water and its preparation method and application

A technology of hexavalent chromium and adsorbent, which is applied in the field of water pollution control, can solve the problems that do not involve the removal of chromium ions in drinking water, the composition of the adsorbent is complex, the preparation process is complex, etc., and the equipment requirements are low and the physical and chemical stability is achieved. Strong, easy-to-prepare effect

Active Publication Date: 2016-01-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the above-mentioned patents all have problems such as complex composition of the adsorbent, easy to cause secondary pollution, and relatively complicated preparation process, and the above-mentioned patents are all aimed at the removal of high-concentration chromium ions in industrial wastewater, and do not involve chromium ions in drinking water bodies. Chromium Ion Removal

Method used

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  • Adsorbent for removing hexavalent chromium in drinking water and its preparation method and application
  • Adsorbent for removing hexavalent chromium in drinking water and its preparation method and application
  • Adsorbent for removing hexavalent chromium in drinking water and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 prepares adsorbent of the present invention

[0033] Weigh 1.23g chitosan and add it into 150ml 10% acetic acid solution by mass percentage, and stir for 1h. Then weigh 8.3934g of FeCl 3 ·6H 2 O and 3.0876 g FeCl 2 4H 2 O was added to the above solution, mixed and stirred until a uniform dark red liquid was produced, and then this solution was added dropwise to 600ml of 30% by mass NaOH solution, and fully stirred and reacted at room temperature for 1h. Cool, stand still, filter, then wash with deionized water until the pH of the suspension is about 7, filter, put the filtered product in an oven at 60°C to dry to constant weight, and dry to obtain the finished adsorbent.

[0034] The SEM figure, XRD figure and infrared spectrum of gained adsorbent are as figure 1 , figure 2 , image 3 As shown, its physical and chemical stability is strong. The obtained adsorbent has good magnetism, and the saturation magnetization can reach 19.44emu / g, and it can ...

Embodiment 2

[0035] The influence of embodiment 2 different reaction times on the application effect of adsorbent of the present invention

[0036] Under room temperature conditions, the initial chromium concentration of the 100mL solution with 100mg of the adsorbent prepared in Example 1 is 2mg L -1 The aqueous solution is subjected to adsorption reaction, wherein the reaction time is controlled at 5, 10, 20, 60, 120, 300, 900, 1440min. The reacted mixed solution was filtered and collected in a dry beaker, and the concentration of chromium ions in the filtrate was determined by spectrophotometry. Table 1 shows the solution concentration and adsorption rate of chromium ions under different reaction times.

[0037] The different reaction time of table 1 is to the influence of adsorbent application effect of the present invention

[0038] Adsorption reaction time (min)

[0039] It can be seen from this that the adsorbent of the present invention has a fast adsorption speed to chr...

Embodiment 3

[0040] The application effect of adsorbent of the present invention in different chromium ion initial concentration solutions of embodiment 3

[0041] At room temperature, use 100 mg of the adsorbent prepared in Example 1 to perform an adsorption reaction on 100 mL of hexavalent chromium solution for 24 hours; set up six gradients in the hexavalent chromium solution according to the initial chromium ion concentration within the range of 0.1-10 mg / L deal with. The concentration of chromium ions was measured by spectrophotometry. Table 2 shows the adsorption rate and amount of chromium ions of the adsorbent at different initial concentrations of chromium ions.

[0042] The adsorption performance of the adsorbent of the present invention on hexavalent chromium ions decreases with the increase of the concentration of chromium ions. When the concentration of chromium ions in the solution is low, that is, when the initial concentration is 0.1-2mg / L, the adsorption rate reaches 97.7 %...

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Abstract

The invention discloses a method for preparing an adsorbent capable of removing hexavalent chromium from a drinking water body, which comprises the following steps: 1) weighing chitosan and molysite according to certain proportion; 2) measuring an acetic acid solution and a NaOH solution respectively according to certain proportion for standby application; 3) dissolving the chitosan in the acetic acid solution, fully stirring, adding the molysite, and stirring until a uniform crimson liquid is obtained; 4) dropwise adding the uniform crimson liquid in the NaOH solution, fully stirring, cooling, standing, filtering, washing, and drying to obtain the adsorbent. The invention further provides the adsorbent prepared through the above method and application of the adsorbent. According to the preparation method, the cost is low, the technology is simple, the operating condition is moderate, the energy consumption is low, and the requirement for equipment is low; the surface of the obtained adsorbent contains various functional groups, the absorbent can be used for efficient removal of hexavalent chromium from the drinking water body, and the treated water body conforms to Standards for Drinking Water Quality of China.

Description

technical field [0001] The invention relates to the field of water pollution control, in particular to an adsorbent for removing hexavalent chromium in drinking water, a preparation method and application thereof. Background technique [0002] Hexavalent chromium Cr(Ⅵ) has strong carcinogenic, mutagenic, and mutagenic effects. At the same time, due to the strong toxicity of chromium, and it is not easy to be decomposed by microorganisms, the food chain is enriched in organisms, and water-soluble Cr(Ⅵ) has been included in the list. It is one of the eight most harmful chemical substances to the human body and one of the three internationally recognized carcinogenic metals. In recent years, with the development of industry, chromium and its compounds have been widely used as important raw materials in metallurgy, electroplating, tanning and other industries. Chromium pollution in the surface water and groundwater of the area seriously threatens the health and safety of drinkin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
Inventor 杨卫春柴立元董舒宇杨志辉王海鹰
Owner CENT SOUTH UNIV
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