Modified corn straw cellulose adsorbent, and preparation method and application thereof

A technology of corn stalks and cellulose, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., to achieve high adsorption capacity, efficient utilization of resources, and simple and easy-to-control effects

Inactive Publication Date: 2019-08-16
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: for the removal of heavy metal ions in the existing wastewater treatment, there is still a lack of a Cu 2+ 、Ni 2+ and Cd 2+ Adsorption and removal of high-efficiency adsorbents and other deficiencies, to provide a special adsorption Cu 2+ 、Ni 2+ and Cd 2+ Modified corn stalk cellulose adsorbent, preparation method and use thereof

Method used

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  • Modified corn straw cellulose adsorbent, and preparation method and application thereof
  • Modified corn straw cellulose adsorbent, and preparation method and application thereof
  • Modified corn straw cellulose adsorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Preparation of Modified Corn Stalk Cellulose Adsorbent

[0049] Such as figure 1 and figure 2 As shown, through the grafting reaction, other groups are introduced on the cellulose matrix, the hydrogen bonds between the cellulose molecules are broken, and then the epoxy group is used to react with DETA to prepare aminated modified cellulose.

[0050] The first step is to obtain corn stalk cellulose: ① After removing the stalk heads, leaves and excess roots, the collected corn stalks are cut into several sections, washed with deionized water, dried, and crushed into particles above 70 mesh; ② 75°C Next, use acetic acid to adjust the pH value of the solution containing 1.7 mg / L sodium chlorite to 4.0, and put the corn stalk particles obtained in ① into the solution at a solid-to-liquid mass ratio of 1:20 to react for 1 hour. After the reaction, add about 25 -35g sodium chlorite, and then continue to react for 1h, and the above reaction process is ultrasonical...

Embodiment 2

[0053] Example 2: Modified corn stalk cellulose adsorbent on Cu 2+ 、Ni 2+ 、Cd 2+ Adsorption test

[0054] Formulated with Cu 2+ 500mg / L of simulated wastewater 1L, the modified corn stalk cellulose adsorbent (MCC-g-GMA-DETA) 1g prepared in Example 1 was dropped into the simulated wastewater that had adjusted the pH to 4-5. Under the condition of stirring at 25°C, the adsorption was carried out for 250 minutes, and samples were taken at 5min, 10min, 15min, 20min, 30min, 45min, 60min, 90min, 120min, 180min, and 240min to detect the concentration of heavy metal ions. The adsorption curve is as follows: Figure 4 Shown (in Cu 2+ example).

[0055] Depend on image 3 It can be seen that within the first 60min, the adsorption amount increases rapidly with time; within 60-120min, the adsorption amount increases slowly with time; after 120min, the adsorption amount tends to balance. At room temperature, pH 4-5, amination modified cellulose to 500mg / L Cu 2+ The equilibrium adso...

Embodiment 3

[0059] Example 3: Modified corn stalk cellulose adsorbent for Cu in industrial wastewater 2+ 、Ni 2+ 、Cd 2+ The removal effect of

[0060] Sampling and detection of industrial wastewater in an industrial park, the pH of the wastewater was measured to be 4.8, Cu 2+The concentration is 254mg / L, Ni 2+ The concentration is 156mg / L, Cd 2+ The concentration is 78mg / L. Get this industrial wastewater 1L, drop into the modified corn straw cellulose adsorbent (MCC-g-GMA-DETA) 3g that the embodiment 1 makes, carry out adsorption under 25 ℃ of stirring conditions for 120 minutes, detect Cu 2+ 、Ni 2+ 、Cd 2+ Residual concentration, the results are shown in the table below.

[0061]

[0062] From the data in the table above, it can be seen that the modified corn stalk cellulose adsorbent (MCC-g-GMA-DETA) obtained by the present invention is applied to high-concentration Cu-containing 2+ 、Ni 2+ 、Cd 2+ In industrial wastewater, Cu 2+ The removal rate reaches 99.0%, Ni 2+ The rem...

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Abstract

The invention particularly discloses a modified corn straw cellulose adsorbent as well as a preparation method and application thereof. A functional component of the modified corn straw cellulose adsorbent is aminated modified cellulose high polymer MCC-g-GMA-DETA. The preparation method comprises the following steps: (1) preparing the corn straw microcrystalline cellulose; (2) carrying out grafting treatment on the corn straw microcrystalline cellulose; and (3) performing amination of the grafted copolymer. The modified corn straw cellulose adsorbent is mainly used for specific adsorption removal of Cu<2+>, Ni<2+> and Cd<2+> in the wastewater treatment process; at room temperature, the maximum adsorption capacities of the adsorbent on three heavy metal ions can reach 196 mg/g, 180 mg/g and 270 mg/g respectively. The adsorbent is high in adsorption rate and can be regenerated and reused for multiple times. The adsorbent has the characteristics of cheap and easily available preparationraw materials, degradability, low toxicity, safety in use, greenness, environmental protection and the like. According to the method, the application field of the corn straw is widened, so that resource efficient utilization of agricultural waste is facilitated.

Description

technical field [0001] The invention belongs to the technical field of resource utilization and environmental protection of agricultural waste, and in particular relates to a modified corn straw cellulose adsorbent, a preparation method and an application. Background technique [0002] Corn stalks are one of the three main crops (corn, wheat and rice) in China. The annual output is huge but the resource utilization rate is low. Only a small amount is used to produce fuel ethanol, feed or extract xylitol, and most of them are used Disposal or incineration in the field causes a great waste of resources and environmental pollution, and the resource utilization of corn stalks needs to be broadened urgently. Cellulose is one of the three major components of crop straw and is the most abundant renewable resource in nature. It has the advantages of degradability and good toughness. If through reasonable chemical modification, appropriate functional groups are introduced into the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/3085B01J2220/4825C02F1/286C02F2101/20
Inventor 王榕吴雨萌
Owner NANCHANG UNIV
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