Titanium dioxide nanotube array bod sensor and its preparation method and application

A nanotube array and titanium dioxide technology, which is applied in the direction of instruments, scientific instruments, and material electrochemical variables, can solve the problems of failure to be practically applied, unstable BOD measurement results, poor reproducibility, etc., and achieve fast and accurate measurement The effect of high precision and low cost

Inactive Publication Date: 2020-04-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing BOD sensors, whether they use dissolved oxygen electrodes, or optical fibers, or other systems such as biofuel cells, all use biofilm (or wrapped biofilm) as the sensitive element for BOD measurement. Many problems, such as the relationship between biomass and biofilm thickness, and the stability of biofilm, lead to unstable and poor reproducibility of BOD measurement results, and have not been applied in practice.

Method used

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  • Titanium dioxide nanotube array bod sensor and its preparation method and application
  • Titanium dioxide nanotube array bod sensor and its preparation method and application
  • Titanium dioxide nanotube array bod sensor and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043] Embodiment 1 (undoped)

[0044] The purchased titanium plates were cut into 1.5cm×1.5cm titanium pieces, washed with an aqueous solution of 1.0% sodium dodecylbenzenesulfonate and 8% NaOH, and then washed with deionized water, acetone, and deionized water respectively. After cleaning for 15 minutes, under a voltage of 15 volts, using glycerol and water with a volume ratio of 4:1 as the electrolyte and 0.5% ammonium fluoride as the electrolyte, the titanium dioxide nanotube array BOD sensor was obtained after electrolyzing the titanium sheet for two hours. After testing, the doped titania nanotube array is mainly composed of the following components by weight percentage: adopt EDX to measure and contain 81.71% Ti and 18.29% O (see Table 1 and figure 2 (LiveTime:30.0sec.Acc.Voltage:10.0kV Take Off Angle:30.0deg.)); The length of the doped titania nanotube array is 5 μm, and the tube diameter is 130-150nm. image 3 .

[0045] Table 1

[0046] Element Line N...

Embodiment approach 2

[0051] Embodiment 2 (doping C, N)

[0052] 0.5mm titanium alloy (titanium content 99.5%) is used as raw material, laser cut into a square titanium sheet with a size of 15mm×15mm, and polished to no scratches. Follow the sequence of deionized water, acetone, and deionized water to ultrasonically clean for 15 minutes to remove the grease on the surface of the titanium sheet. Soak in 7% HF, 35% HNO3, 7% HCl, 51% H2O ratio solution for 60s, wash with deionized water and dry in an oven at 40°C. After drying, fix it with a platinum sheet electrode clip and put it into an anodic oxidation tank. Use 400ml of glycerol aqueous solution (volume ratio 4:1) containing 0.5wt% NH4F as the electrolyte, and electrolyze with a DC voltage of 15V for 2 hours to obtain titanium dioxide nanotubes. After drying, put it into a 10% concentration of urea solution and immerse it for 30 minutes, dry it again, put it into a muffle furnace for heat treatment at 450 degrees for 3 hours, and obtain a C, N-d...

Embodiment approach 3

[0058] Embodiment 3 (doping C, N)

[0059]0.5mm titanium alloy (titanium content 99.5%) is used as raw material, laser cut into a square titanium sheet with a size of 15mm×15mm, and polished to no scratches. Follow the sequence of deionized water, acetone, and deionized water to ultrasonically clean for 15 minutes to remove the grease on the surface of the titanium sheet. Soak in 10% HF, 40% HNO3, and 5% HCl aqueous solution for 60 seconds, wash with deionized water, and dry in an oven at 40 degrees. After drying, fix it with a platinum sheet electrode clip and put it into an anodic oxidation tank. Use 400ml of glycerol aqueous solution (volume ratio 4:1) containing 0.2wt% NH4F as the electrolyte, and electrolyze with a DC voltage of 15V for 2 hours to obtain titanium dioxide nanotubes. After drying, immerse in 15% urea solution for 30 minutes, dry again, put it into a muffle furnace for heat treatment at 450 degrees for 3 hours, and obtain C and N-doped titanium dioxide nano...

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Abstract

The invention discloses a titanium dioxide nano-tube array BOD sensor and a preparation method and an application thereof. The titanium dioxide nano-tube array BOD sensor comprises a titanium plate ora titanium alloy plate matrix and a titanium dioxide-doped nano-tube array generated at the surface of the titanium plate or the titanium alloy plate matrix, the titanium dioxide-doped nano-tube array mainly comprises the following components according to the weight percentage: 0.5-3% of carbon, 0.3-2.5% of nitrogen and the balance of TiO2; a length of the titanium dioxide-doped nano-tube array is 50 nm-10 [mu]m, and a diameter is 20 nm-300 nm. According to the invention, the C and N-doped titanium dioxide nano-tube array BOD sensor is employed, the measurement accuracy, service life and reappearance are effectively increased, and the titanium dioxide nano-tube array BOD sensor has the characteristics of low cost, fast measurement speed, high accuracy, and on-line monitoring realization.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a titanium dioxide nanotube array BOD sensor, a preparation method thereof and an application in measuring wastewater BOD. Background technique [0002] The organic components contained in wastewater are very complex, and it is not easy to determine their absolute composition. In water quality monitoring, the oxygen consumed by the biochemical reaction of organic matter in water under certain conditions is often used to indirectly indicate the content of organic matter in the water body, which is Bio-chemical Oxygen Demand (BOD). [0003] The biological oxidation process is divided into two stages: the first stage is the oxidation of carbon and hydrogen in organic matter into carbon dioxide and water under the action of microorganisms, this stage is called the carbonization stage, and it takes about 20 days to complete the carbonization stage at 20°C;...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30G01N27/327G01N27/406
CPCG01N27/26G01N27/308G01N27/327G01N27/406
Inventor 向文毓方继敏徐惠敏
Owner WUHAN UNIV OF TECH
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