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Biochar modified film for dgt device, dgt device and manufacturing method thereof

A production method and biochar technology, applied in the field of environmental pollution control, can solve the problems of not considering the migration process of heavy metals, poor regional applicability, lack of DGT technology heavy metal bioavailability prediction, etc., and achieve high prediction efficiency, low cost, The effect of easy availability of raw materials

Active Publication Date: 2022-02-15
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the traditional DGT technology does not consider the migration process of heavy metals between the solid-liquid two phases in the soil, ignoring the concentration of soil dissolved organic matter (DOM), pH, different concentrations of Cl - / NO 3 - / SO 4 2- and Na + / Mg 2+ Due to the influence of hydration conditions such as anion and cation strength, its regional applicability is not strong. At present, there is still a lack of application of DGT technology in the prediction of heavy metal bioavailability in polluted sites.

Method used

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  • Biochar modified film for dgt device, dgt device and manufacturing method thereof
  • Biochar modified film for dgt device, dgt device and manufacturing method thereof
  • Biochar modified film for dgt device, dgt device and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0057] 1. Biochar-modified film diffusion gradient device (B-DGT) and its fabrication

[0058] The structure of the B-DGT used in this example can be found in figure 1 , comprising a DGT core module and a shell for accommodating and fixing the DGT core module; wherein, the shell includes a base 1 and a cap 2, and the cap 2 is provided with an exposure window 21; the DGT core module includes a binding film 3, a diffusion Membrane 4 and filter membrane 5, filter membrane 5 seals exposure window 21; Wherein, binding membrane 3 is the biochar modified film that this embodiment makes, base 1 and cap 2 are ABS plastics, diffusion membrane 4 is this embodiment The material of the obtained agar diffusion membrane, the filter membrane 5 is PES.

[0059] The B-DGT used in the present embodiment is made by the laboratory, and the specific method is as follows:

[0060] 1.1 Preparation steps of agar solution and agar diffusion membrane:

[0061] Take an appropriate amount of agar pow...

Embodiment 2

[0110] This example is the same as the steps in Section 1.2 of Example 1, except that the ratio of the biochar mixture to the agar solution is different. In this example, the effects of different ratios of biochar mixture and agar solution to prepare binding membranes were compared as follows: Figure 10 As shown, among them, Figure 10 A in the figure shows the binding membrane prepared according to the volume ratio of the biochar mixture and the agar solution at 1:1. From the figure, the phenomenon of partial agglomeration of the biochar can appear, which affects the effect of the binding membrane; Figure 10 c in the figure shows the binding membrane prepared according to the volume ratio of biochar mixture and agar solution of 1:5. Although the biochar dispersibility is good, the mechanical strength is poor, which is not conducive to the extraction and maintenance of the membrane; while Figure 10 The b in the figure shows the binding membrane prepared according to the vo...

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Abstract

The application provides a biochar modified film for DGT devices, which is made of biochar powder and agar, and the biochar powder is evenly dispersed in the film; it also provides a biochar modified film for DGT devices A method for making a permanent film, comprising: mixing and uniformly dispersing biochar powder and ultrapure water to obtain a biochar mixed solution; mixing an appropriate amount of agar solution with the biochar mixed solution until uniform to obtain a biochar-agar mixed solution; The agar-biochar mixture is formed into a solidified film, thereby obtaining the biochar modified film. In addition, a DGT device using the above-mentioned biochar modified film as a binding film is also provided. The scheme of this application can be applied to the prediction of the availability of heavy metals in situ in different types of soils, and can also realize the prediction of the bioavailability of non-metallic elements such as As, with the ability to predict the availability of various metal / non-metal ions in different forms and high prediction efficiency , low cost and other advantages.

Description

technical field [0001] The application belongs to the technical field of environmental pollution control, and specifically relates to a biochar modified film used in a DGT device, a DGT device and a manufacturing method thereof, and is especially suitable for in-situ heavy metal bioavailability prediction in polluted site soil. Background technique [0002] my country is a country seriously affected by heavy metal pollution, and the potential harm of soil heavy metal pollution has attracted widespread attention. The bioavailability of heavy metals is a key parameter to measure the mobility and ecological impact of heavy metal elements. At present, the evaluation methods for the bioavailability of heavy metals in soil mainly include the method of diffusive gradients in Thin-films (DGT). DGT technology mainly uses the principle of free diffusion (Fick's first law), and obtains the (biologically) effective state content and spatial distribution of the target in the environmenta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/08B01D67/00B01D61/58G01N13/00
CPCB01D71/021B01D71/08B01D67/0079B01D61/58G01N13/00G01N2013/003B01D2325/12
Inventor 王翠苹朱青薛亚楠梁亚峰祝凌燕
Owner NANKAI UNIV
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