Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of biologically synthesizing ZnxCd1-xS quantum dots by using zinc-cadmium wastewater as metal source

A biosynthesis and quantum dot technology, applied in the field of green technology, can solve the problems of large zinc and cadmium wastewater production, low recovery value, and high toxicity, and achieve low energy consumption, low cost, and mild reaction conditions.

Inactive Publication Date: 2019-07-26
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is to propose a kind of utilization sulfate-reducing bacteria (dominant flora consists of Desulfovbrio sp., Clostridiaceae sp., Proteiniphilum sp., Geotoga sp. . and Sphaerochaeta sp.) method for preparing large batches of fluorescent ZnCdS quantum dots quickly and easily

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of biologically synthesizing ZnxCd1-xS quantum dots by using zinc-cadmium wastewater as metal source
  • Method of biologically synthesizing ZnxCd1-xS quantum dots by using zinc-cadmium wastewater as metal source
  • Method of biologically synthesizing ZnxCd1-xS quantum dots by using zinc-cadmium wastewater as metal source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of ZnCdS quantum dots from wastewater with Zn / Cd concentration ratio of 3:1

[0037] Step 1, the cultivation of sulfate-reducing bacteria

[0038] 1. The medium composition of sulfate reducing bacteria is: 0.2mol / L lactic acid, 14.28g / L Na 2 SO 4 , 1.0g / LNH 4 Cl, 0.5g / L KH 2 PO 4 , 0.5g / L MgSO 4 , 0.1g / L CaCl 2 , 0.5g / L yeast extract powder, pH7.0;

[0039] 2. Insert the sulfate-reducing bacteria into the culture medium of sulfate-reducing bacteria, and put them into anaerobic culture at 37°C. Transplant once every 20 days according to the volume ratio of 25% (seed solution / medium).

[0040] Step 2, preparation of ZnCdS quantum dots

[0041] Adjust the pH of the zinc-cadmium wastewater to neutral, add the sulfate-reducing bacteria cultured for 5 days to the zinc-cadmium wastewater with a concentration ratio of Zn:Cd=3:1, mix well and let stand for 1-2h, and centrifuge the obtained product at 8000rpm for 5min to collect the precipitate. I...

Embodiment 2

[0042] Example 2: Preparation of ZnCdS quantum dots from wastewater with Zn / Cd concentration ratio of 5:1

[0043] Step 1, the cultivation of sulfate-reducing bacteria

[0044] 1. The medium composition of sulfate reducing bacteria is: 0.1mol / L lactic acid, 7.14g / L Na 2 SO 4 , 1.0g / LNH 4 Cl, 0.5g / L KH 2 PO 4 , 0.5g / L MgSO 4 , 0.1g / L CaCl 2 , 0.5g / L yeast extract powder, pH7.0;

[0045] 2. Insert the sulfate-reducing bacteria into the sulfate-reducing bacteria culture medium, and place it at 33° C. for anaerobic culture. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0046] Step 2, preparation of ZnCdS quantum dots

[0047] Adjust the pH of the zinc-cadmium wastewater to neutral, add the sulfate-reducing bacteria cultured for 6 days to the zinc-cadmium wastewater with a concentration ratio of Zn:Cd=5:1, mix well and let it stand for 1 hour, and centrifuge the obtained product at 6000rpm for 10min to collect the precipitate....

Embodiment 3

[0048] Embodiment 3: Zn / Cd concentration ratio 9:1 prepares ZnCdS quantum dot

[0049] Step 1, the cultivation of sulfate-reducing bacteria

[0050] 1. The medium composition of sulfate reducing bacteria is: 0.2mol / L lactic acid, 14.28g / L Na 2 SO 4 , 1.0g / LNH 4 Cl, 0.5g / L KH 2 PO 4 , 0.5g / L MgSO 4 , 0.1g / L CaCl 2 , 0.5g / L yeast extract powder, pH7.0;

[0051] 2. Insert the sulfate-reducing bacteria into the culture medium of sulfate-reducing bacteria, and place it at 35° C. for anaerobic culture. Transplant once every 20 days according to the volume ratio of 25% (seed solution / medium).

[0052] Step 2, preparation of ZnCdS quantum dots

[0053] Adjust the pH of the zinc-cadmium wastewater to neutral, add the sulfate-reducing bacteria cultured for 7 days to the zinc-cadmium wastewater with a concentration ratio of Zn:Cd=9:1, mix and let it stand for 1 hour, and collect the precipitate by centrifuging at 10,000 rpm for 5 minutes. It was dried at ℃, ground to powder, an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method of preparing various different fluorescent Znx-Cd1-xS quantum dots having uniform particle size simply and efficiently in batch through zinc-cadmium wastewater via sulfate-reducing bacteria, and belongs to the technical field of green techniques. Quantum dots about 7 nm in uniform particle size and having good dispersity are prepared by adding sulfate-reducing bacteria; various Znx-Cd1-xS quantum dots with different light-emitting peaks are prepared according to wastewaters having different Zn-Cd concentration ratios. When the Zn-Cd concentration ratio in a solution is 3:1 to 20:1, the prepared ZnxCd1-xS quantum dots have photoluminescent spectrum from red light to blue light when excited at 365 nm, and have photoluminescent peaks at 470-590 nm. The different fluorescent ZnxCd1-xS ternary quantum dots are synthesized for the first time herein through a microbiological method; the problems of the prior art, such as high zinc-cadmium wastewater yield, high toxicity and low recycling value, are solved.

Description

technical field [0001] The invention relates to a simple and high-efficiency preparation of Zn with high fluorescence activity in large quantities from zinc and cadmium wastewater by using sulfate reducing bacteria x Cd 1-x The method of S quantum dot belongs to the field of green process technology. Background technique [0002] Cadmium is a non-ferrous heavy metal that often exists in nature together with zinc. Zinc concentrates generally contain 0.2% to 0.7% cadmium. Cadmium is the most important by-product of zinc metallurgy, and its output accounts for 95% of the world's cadmium output. Zinc and cadmium are one of the most common toxic pollutants, which widely exist in wastewater, waste gas and waste residues in metallurgy, electronics, electroplating, machinery, batteries, petrochemical and many other industries. This kind of heavy metal waste is extremely toxic, the price is very low, and the demand is not large. The traditional resource disposal technology recover...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K11/56B82Y20/00B82Y40/00C12P3/00C12R1/01
CPCB82Y20/00B82Y40/00C09K11/565C12P3/00
Inventor 辛宝平褚会超祁诗月王佳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com