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Preparation method of wood film for adsorbing copper ions

A technology of copper ions and ionized water, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of complex chemical grafting process and difficult grafting of functional groups, and achieve improved Mechanical strength, effect of increasing adsorption capacity

Active Publication Date: 2022-08-09
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method provides a new research idea for the whole wood to be used for water treatment, but it is difficult to graft functional groups into the wood due to the compact cell wall structure, and the chemical grafting process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) The poplar was sawed along the cross section and cut into wood chips with a thickness of 5 mm. After vacuum drying at 100 °C for 24 hours, the humidity was adjusted at 20 °C and 65% relative humidity for 12 hours.

[0021] (2) Prepare a 5wt% sodium chlorite solution, adjust the pH of the solution to 4.5-5.0 with glacial acetic acid, and put the wood chips in (1) into the mixed solution for vacuum immersion for 10 minutes. The solution was heated to 75°C in a water bath, treated for 1 h, and the process was repeated 5 times to remove the lignin. Finally, washed with deionized water until neutral, frozen in liquid nitrogen for 30 min, and then freeze-dried in a vacuum desiccator for 24 h.

[0022] (3) Press H 2 O: TEMPO: sodium bromide: sodium hypochlorite: wood chips = 100: 0.01: 0.1: 10: 1 mass ratio to prepare reagents. The delignified wood chips were immersed in the TEMPO solution in vacuum, and sodium bromide and sodium hypochlorite reagents were gradually adde...

Embodiment example 2

[0026] (1) The balsa wood was sawed along the cross section and cut into wood chips with a thickness of 10 mm. After vacuum drying at 100 °C for 24 hours, the humidity was adjusted at 20 °C and 65% relative humidity for 12 hours.

[0027] (2) Prepare a 5wt% sodium chlorite solution, adjust the pH of the solution to 4.5~5.0 with glacial acetic acid, and put the wood chips in (1) into the mixed solution for vacuum immersion for 12 minutes. The solution was heated to 75°C in a water bath, treated for 1 h, and the process was repeated 8 times to remove the lignin. Finally, washed with deionized water until neutral, frozen in liquid nitrogen for 30 min, and then freeze-dried in a vacuum desiccator for 24 h.

[0028] (3) Press H 2 O: TEMPO: sodium bromide: sodium hypochlorite: wood chips = 100: 0.01: 0.1: 10: 1 mass ratio to prepare reagents. The delignified wood chips were immersed in the TEMPO solution in vacuum, and sodium bromide and sodium hypochlorite reagents were gradually...

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Abstract

The invention discloses a preparation method of a wood film for adsorbing copper ions. The preparation method comprises the following steps: cutting a wood chip with a certain thickness along a cross section; carrying out delignification treatment on the cut wood chips by using an acidic sodium chlorite solution, washing the wood chips to be neutral by using deionized water, and then carrying out freeze drying; the delignification wood chips are subjected to in-situ nanocrystallization treatment through a TEMPO oxidation system, liquid nitrogen is adopted for freezing, and then freeze drying is conducted; and the in-situ nanocrystallization wood chips are rolled at a certain angle along the cross section, the compressed wood film is taken out, nitrogen freezing is conducted, then freeze drying is conducted, and the wood film with the copper ion adsorption function is obtained. The TEMPO oxidation treatment can graft a large number of carboxyl groups on the cellulose, provides basic conditions for adsorption of copper ions, and can break hydrogen bond connection between fibers, so that a compact cell wall structure is separated into nano cellulose in situ, a large number of micro-nano pore structures are formed, and sufficient space is provided for adsorption of the copper ions.

Description

technical field [0001] The invention relates to a preparation method of a wood film for adsorbing copper ions, and belongs to the field of bamboo / wood processing. Background technique [0002] The adsorption of heavy metal ions in wastewater has always been a research hotspot. In recent years, biomass materials have been gradually used as adsorption substrates for heavy metal ions due to their easy availability, sustainability, and porosity. In recent years, composite adsorption materials of cellulose or nanocellulose prepared from biomass as raw materials and functional groups that can adsorb heavy metal ions have become a research hotspot. However, due to the complex preparation process of cellulose and nanocellulose, the energy consumption is relatively large. , resulting in higher product costs. Recently, related researchers have directly used the natural pore structure of wood for graft modification such as sulfhydryl or amino groups, and used it for the adsorption of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28033C02F1/286C02F2101/20Y02W10/37Y02P10/20
Inventor 何文韦柏任曹济舟季秋琳庞群艳梁爽
Owner NANJING FORESTRY UNIV
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