A buoyant multifunctional composite material for effective removal of organic compounds in water and wastewater

A technology of organic compounds and composite materials, applied in the field of floating multifunctional composite materials for effectively removing organic compounds in water and wastewater, can solve problems such as low utilization rate, reduce the performance of adsorbents and photocatalysts, and achieve cost-effective , less capital and operating costs, the effect of high mass transfer rate

Inactive Publication Date: 2012-10-31
NAT UNIV OF SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in these traditional photocatalytic methods, the provided light usually has very low utilization
Third, the porous sorbent used in the combined sorbent / catalyst system is clogged with catalyst particles in the pores, greatly reducing the performance of both the sorbent and the photocatalyst.

Method used

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  • A buoyant multifunctional composite material for effective removal of organic compounds in water and wastewater
  • A buoyant multifunctional composite material for effective removal of organic compounds in water and wastewater
  • A buoyant multifunctional composite material for effective removal of organic compounds in water and wastewater

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Embodiment 1

[0039] A 5 g amount of 25 nm TiO 2 The granules were treated in a 2 g / L salicylic acid solution for 30 minutes and dried in an oven at 100° C. for 2 hours. Then, the treated TiO 2 The particles were mixed with 0.05 g of multi-walled carbon nanotubes (diameter 110-170 nm, length 5-9 μm) and heated in an oven at 200° C. for 2 hours. Then, 10 grams of 100-mesh activated carbon particles were mixed with TiO 2 Mix with the mixture of carbon nanotubes, and then pack all the components in a 250 mL reactor. The mixture in the reaction vessel was preheated to and maintained at 200°C with a hot plate heater and stirred with a mechanical mixer. Then, an amount of 30 grams of polypropylene (PP) having a diameter of about 4 mm was added to the reactor. The mixture in the reactor was further heated with stirring to increase and maintain the temperature to 160°C. The process continued for another 3 minutes. Then, the PP particles and the small-sized powder mixture are sufficiently fixe...

Embodiment 2

[0041] 50 g P25TiO 2 (AEROXIDE, Degussa) was mixed with 50 g of 100 mesh activated carbon particles in an 800 mL reactor to prepare a multifunctional floatable photocatalyst. The mixture was preheated to and maintained at 185°C with a hot plate heater and stirred with a mechanical mixer. Next, 50 polypropylene (PP) pellets with a diameter of about 4 mm were added to the reactor. The mixture was further heated with stirring for 10 minutes. Make PP particles covered with TiO 2 and activated carbon granules. The treated PP particles were then collected and washed with ethanol and water. The washed particles were added to a 300 mL glass beaker along with 300 mL of 10 ppm phenol solution. The glass beaker was irradiated with a 150W xenon lamp with a beam diameter of 3". The air diffuser was used to introduce 1.5 liters of air per minute into the phenol solution. The phenol concentration was analyzed using an HPLC instrument with a C18 column. As Figure 4 As shown, the phenol...

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Abstract

A composite material for water or wastewater treatment is described. The composite material has a buoyant substrate, an adsorbant for adsorbing organic compounds, a photocatalyst for degrading organic compounds, and an enhancer for facilitating mass transfer between the adsorbent and the photocatalyst, increasing the selectivity of the composite material, or for improving the photocatalytic efficiency is described. The adsorbent, photocatalyst, and enhancer are immobilized on the substrate.

Description

[0001] related application [0002] This application claims the benefit of US Provisional Application No. 61 / 300,514, filed February 2, 2010. The entire teachings of the aforementioned applications are incorporated herein by reference. Background technique [0003] Traditionally, large amounts of organic compounds in wastewater are usually removed by various biological treatments. For relatively low levels of organic compounds in effluent water from wastewater treatment plants for recycling or in raw water for water supply systems, adsorption is commonly used as a removal method in common industrial practice. However, many organic compounds such as dyes, phenolics and synthetics in industrial effluent waters, or many organic compounds in natural waters such as humic substances are not practically biodegradable. Therefore, traditional biological treatment often fails to achieve the desired treatment goals. On the other hand, the removal of organic compounds by adsorption dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/00B01J37/00
CPCB01J31/06B01J21/18C02F1/28B01J20/20B01J2220/42C02F2101/345C02F2303/16B01J37/0221B01J35/004B01J20/18C02F1/725B01J20/324B01J20/321B01J20/3238C02F2101/308B01J21/063C02F1/30B01J21/185B82Y30/00Y10T428/2967Y10T428/2969Y10T428/31739Y10T428/31931Y10T428/31938Y02W10/37B01J20/26B01J35/02B01J37/00
Inventor 白仁碧韩慧
Owner NAT UNIV OF SINGAPORE
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