Preparation method and application of MCS/SA-PEI composite hydrogel beads

A technology of composite hydrogel and hydrogel beads, which is applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of heavy secondary pollution, difficult recovery of heavy metals, and high treatment costs , to achieve the effect of improving adsorption performance, strong affinity, and simple preparation method

Inactive Publication Date: 2020-06-26
NANJING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of heavy secondary pollution, high treatment cost and difficult recovery of heavy metals in the common treatment methods of organic complexed heavy...

Method used

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  • Preparation method and application of MCS/SA-PEI composite hydrogel beads
  • Preparation method and application of MCS/SA-PEI composite hydrogel beads
  • Preparation method and application of MCS/SA-PEI composite hydrogel beads

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) MCS / SA@PEI hydrogel beads were prepared by the above method, the adjustment variable was different ammoniated chitosan, and the rest of the synthesis conditions were kept the same, and MCS-1 / SA@PEI (ammoniation reagent was tetraethylenetri amine pentaacetic acid), MCS-2 / SA@PEI (ammonizing reagent is ethylenediamine tetraacetic acid), MCS-3 / SA@PEI (ammonizing reagent is diethylenetriamine), MCS-4 / SA@PEI ( The ammoniating reagent is tetraethylenepentamine) four kinds of hydrogel adsorbents, respectively denoted as adsorbents A, B, C, and D;

[0045] (2) Weigh 0.050 g of the above four hydrogel beads in sequence, place them in 150 mL Erlenmeyer flasks, add 50 mL of Ni-EDTA solution with an initial concentration of 1.0 mmol / L, and shake at a constant temperature of 298 K Oscillate at 160 r / min for 10 h to allow the adsorption to reach equilibrium, measure the concentration of heavy metal ions in the solution at the initial and equilibrium times, and calculate the adsorp...

Embodiment 2

[0048] (1) Tetraethylenetriaminepentaacetic acid was selected as the ammoniating reagent, the adjustment variable was different mass ratios (dry weight) of MCS and SA in the mixed solution, and the rest of the synthesis conditions were kept the same to obtain MCS- / SA-1@PEI (MCS: SA=0.5:1), MCS / SA-2@PEI (MCS:SA=1:1), MCS / SA-3@PEI (MCS:SA=1.5:1), MCS / SA-4@PEI (MCS : SA=2:1) ​​four kinds of hydrogel beads, respectively denoted as adsorbent E, F, G, H;

[0049] (2) Weigh 0.050 g of the above four hydrogel beads in sequence, place them in 150 mL Erlenmeyer flasks, add 50 mL of Ni-EDTA solution with an initial concentration of 1.0 mmol / L, and shake at a constant temperature of 298 K Oscillate at 160 r / min for 10 h to allow the adsorption to reach equilibrium, measure the concentration of heavy metal ions in the solution at the initial and equilibrium times, and calculate the adsorption amount (mmol / g). The experimental results are shown in Table 1.

Embodiment 3

[0051] (1) The ammoniation reagent is tetraethylenetriaminepentaacetic acid, the mass ratio (dry weight) of MCS to SA is controlled at 2:1, the adjustment variable is different concentrations of PEI, and the rest of the synthesis conditions are kept the same to obtain MCS- / SA @PEI-1 (PEI concentration 1wt%), MCS / SA@PEI-2 (PEI concentration 1.5wt%), MCS / SA@PEI-3 (PEI concentration 2wt%), MCS / SA@PEI-4 (PEI concentration 3wt%) four kinds of hydrogel adsorbents, respectively denoted as adsorbent I, J, K, L;

[0052] (2) Weigh 0.050 g of the above four hydrogel adsorbents in turn, place them in 150 mL Erlenmeyer flasks, add 50 mL of Ni-EDTA solution with an initial concentration of 1.0 mmol / L, and shake at a constant temperature of 298 K Oscillate at 160 r / min for 10 hours to make the adsorption reach equilibrium, measure the concentration of heavy metal ions in the solution at the initial stage and at equilibrium, and calculate the adsorption amount (mmol / g). The experimental res...

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Abstract

The invention belongs to the field of heavy metal pollution control, aims at solving the problem of efficient removal of heavy metals in organic complexing wastewater, and particularly relates to a preparation method and application of MCS/SA-PEI composite hydrogel beads. The preparation method of the composite hydrogel beads comprises the following steps: dissolving an amino-modified reagent andchitosan powder in ultrapure water, and adding a cross-linking agent I to form amino-modified chitosan MCS; the preparation method comprises the following steps: uniformly mixing MCS powder and sodiumalginate (SA) powder in proportion at normal temperature, and dropwise adding the mixture into a coagulating bath to form MCS/SA hydrogel beads; and finally, putting the MCS/SA hydrogel beads into the PEI solution, and adding a cross-linking agent II to carry out cross-linking reaction, thereby obtaining the composite hydrogel beads. When the composite hydrogel ball bead is added into heavy metalorganic complexing wastewater, the comprehensive effects of adsorption bridging, electrostatic attraction and the like can be achieved, and efficient separation and removal of complexing-state heavymetal are achieved. The composite hydrogel ball disclosed by the invention is simple in preparation process, low in cost, stable in structure and good in recovery performance. Various heavy metals canbe efficiently separated and recycled from a wide variety of organic complexing wastewater, and the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution control, and in particular relates to the preparation of MCS / SA@PEI composite hydrogel beads and the resourceful treatment of heavy metals in organic complex wastewater. Background technique [0002] With the rapid development of modern industry, organic complexing agents are widely used, and complex systems of organic matter and heavy metals are commonly used in many industries such as electroplating and printing. In such complex wastewater, the interaction between heavy metals and organic matter, conventional treatment methods, such as precipitation, electrochemical deposition, electrolysis, solvent extraction, and biological methods, are difficult to meet the requirements for heavy metals to meet stable standards, or face high treatment costs, Complex operation and secondary pollution and other problems. Therefore, it is of great significance to develop an environmentally friendly treatmen...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/261B01J20/28047C02F1/288C02F2101/20
Inventor 刘福强袁媛刘自成冯悦峰宋丽李大伟李爱民
Owner NANJING UNIV
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