A kind of adsorption material that can absorb trivalent arsenic in water by using waste straw, its preparation method and application

A technology for waste straws and adsorption materials, which is applied in adsorption water/sewage treatment, chemical instruments and methods, and other chemical processes, etc., can solve the problems of lack of economy, complex preparation process, low adsorption capacity, etc. The effect of easy availability of reaction raw materials and simple synthesis steps

Active Publication Date: 2016-08-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the shortcomings of the adsorption materials reported in the existing literature: 1) The adsorption capacity of activated carbon adsorption materials is low, and the service life is short when treating high-concentration arsenic-containing sewage; 2) Metal / mineral adsorption materials such as activated alumina, zero-valent iron etc., its cost is high, and it is not suitable for large-scale; 3) Although artificially synthesized polymer resin materials have a large adsorption capacity, they usually need to synthesize a polymer matrix first, and then graft groups on the surface or load metals, so the preparation process is more complicated. , and the cost is also high, lack of economy, and the polymer resin material itself is not easy to degrade, and it needs to be disposed of safely when the service life is exhausted; 4) The existing raw materials for preparing adsorption materials from plant fibers are mostly bagasse, natural Hemp, cotton fiber, etc., mainly adsorb and remove phosphate, nitrate ions and heavy metal ions in water, and need to add swelling agent, catalyst, graft monomer, amination reagent, etc. during the synthesis process, the amination reaction process is complicated and the recovery rate is low

Method used

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  • A kind of adsorption material that can absorb trivalent arsenic in water by using waste straw, its preparation method and application
  • A kind of adsorption material that can absorb trivalent arsenic in water by using waste straw, its preparation method and application
  • A kind of adsorption material that can absorb trivalent arsenic in water by using waste straw, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Pretreatment of straw

[0041] Wash the wheat straw (WS) with distilled water, dry it at 60°C, cut it into small pieces of about 0.5-0.8mm, and put it into 1%Na 2 CO 3 and 1% NaCl mixture, ultrasonic cleaning 2h. After taking it out, wash it with distilled water and dry it at 60°C for later use.

[0042] (2) Quaternization reaction

[0043] Put 2 g of wheat straw into a three-necked flask, add 30 mL of Quat188 (50% aqueous solution), 30 mL of 3M sodium hydroxide solution, heat in a water bath at 80 °C for 12 h, cool and filter, wash with distilled water until neutral, and dry in vacuum at 60 °C to obtain The wheat straw material WS-N modified by quaternary ammonium salt can be used to adsorb arsenic (Ⅲ), and the structural formula of WS-N is as follows figure 1 Shown:

[0044]

[0045] Its physical and chemical properties are as follows:

[0046] Nitrogen content (%)

Water absorption (mass ratio)

1.42

5.73

[0047] (3) Static e...

Embodiment 2

[0055] (1) Pretreatment of straw

[0056] Wash the rice straw (WS) with distilled water, dry it at 60°C, cut it into small pieces of about 0.5-0.8mm, and then put it into 2%Na 2 CO 3 and 2% NaCl mixture, ultrasonic cleaning 3h. After taking it out, wash it with distilled water and dry it at 50°C for later use.

[0057] (2) Quaternization reaction

[0058] Put 2 g of rice straw into a three-necked flask, add 34 mL of Quat188 (60% aqueous solution), 30 mL of 4M sodium hydroxide solution, heat in a water bath at 75 °C for 14 h, cool and filter, wash with distilled water until neutral, and dry under vacuum at 40 °C to obtain The physical and chemical properties of quaternary ammonium salt modified rice straw material WS-N are as follows:

[0059] Nitrogen content (%)

Water absorption (mass ratio)

1.55

5.82

[0060] figure 2 It is the solid nuclear magnetic resonance spectrum of the adsorbent material WS-N prepared in embodiment 2 13 CNMR and th...

Embodiment 3

[0068] (1) Pretreatment of straw

[0069] Wash corn stalks (WS) with distilled water, dry at 60°C, cut into small pieces of about 0.5-0.8mm, and then put them into 3% Na 2 CO 3 and 3% NaCl mixture, ultrasonic cleaning 2.5h. After taking it out, wash it with distilled water and dry it at 40°C for later use.

[0070] (2) Quaternization reaction

[0071] Put 2g of corn stalks into a three-necked flask, add 36mL of Quat188 (70% aqueous solution), 30mL of 5M sodium hydroxide solution, heat in a water bath at 70°C for 16h, cool and filter, wash with distilled water until neutral, and dry under vacuum at 50°C to obtain a quaternary amine The salt-modified corn stalk material WS-N can be used to adsorb arsenic(Ⅲ), and its physical and chemical properties are as follows:

[0072] Nitrogen content (%)

Water absorption (mass ratio)

1.65

5.61

[0073] Figure 4 It is the XPS analysis diagram of the adsorption material WS-N prepared in Example 3, the absc...

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Abstract

The invention discloses an adsorption material capable of adsorbing trivalent arsenic in water prepared by using waste straw and a preparation method thereof, belonging to the field of synthesis and application of environmental functional materials. In the invention, the waste straw is used as a substrate, and the adsorption material is prepared through one-step quaternization reaction. The preparation method is simple and the sources of raw materials are wide. The prepared adsorption material can effectively adsorb and remove trivalent arsenic in water. The adsorption performance is stable. The preparation of new adsorbent materials by this method is an effective way for resource utilization of farmland waste straw.

Description

Technical field: [0001] The invention discloses an adsorption material capable of absorbing trivalent arsenic in water and a preparation method thereof, more specifically, an adsorption material capable of adsorbing trivalent arsenic in water prepared by using waste straw, a preparation method and application thereof. Background technique: [0002] Trivalent arsenic is extremely harmful to human health and the ecological environment. How to efficiently remove trivalent arsenic from water has become a research hotspot in the field of water pollution control. The adsorption method utilizes the large specific surface area provided by the adsorbent, and achieves the purpose of purifying and removing arsenic through the strong affinity between the arsenic pollutant and the adsorbent. The adsorption method has attracted people's attention because of its simple operation, stable operation effect, recyclable arsenic in wastewater, no secondary pollution to the environment, and the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 王津南孟颖王钇田淑艳
Owner NANJING UNIV
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