Method for removing rhodamine B dye from wastewater by walnut shell biomass charcoal adsorbent

A biochar and walnut shell technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, and other chemical processes, can solve the problems of resource waste, pollution, incineration or discarding, etc., and achieve good adsorption performance.

Active Publication Date: 2014-06-18
BEIJING UNIV OF TECH
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, walnuts were sold as dried fruits, and they were discarded directly after eating, and the shells were difficult to recycle.
At present, walnuts are deeply processed in the food processing industry. Although walnut shells, the by-products of the processing, can be recycled systematically, most of them are still incinerated or discarded, resulting in waste of resources and environmental pollution.

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 for removing rhodamine B dye from wastewater by walnut shell biomass charcoal adsorbent
  • Method for removing rhodamine B dye from wastewater by walnut shell biomass charcoal adsorbent
  • Method for removing rhodamine B dye from wastewater by walnut shell biomass charcoal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] Sorbent preparation

[0024] Take a certain amount of commercially available common walnut shells, wash them with tap water, dry them, crush them, and sieve them to 300-600 μm, mix the crushed walnut shells and zinc chloride solution according to the mass of walnut shells (g): the mass of zinc chloride solution (g) mixed and impregnated in a conical flask with a ratio of 1:6, in which the concentration of zinc chloride solution was 30%, and then heated by 560W microwave for 15 minutes, and the obtained walnut shell biochar was pickled with 10% hydrochloric acid, Wash with distilled water until the pH is neutral, and dry to obtain adsorbent A.

[0025] Take a certain amount of commercially available common walnut shells, wash them with tap water, dry them, crush them, and sieve them to 300-600 μm, mix the crushed walnut shells and zinc chloride solution according to the mass of walnut shells (g): the mass of zinc chloride solution (g) mixed and impregnated in a conical ...

Embodiment 1

[0030] Take adsorbent B and sodium chloride and add the pH value of the solution to 2, 4, 7, 9, respectively, in the rhodamine B solution of 650mg / L, wherein every 0.05g of adsorbent B corresponds to 2.5g of sodium chloride and 50mL of rhodamine B After the solution was stirred or shaken at 25°C for 6 hours, it was separated by filtration, and the filtrate was adjusted to neutrality before being discharged.

[0031] The effect of different initial pH on the removal effect of rhodamine B is as follows: figure 1 Shown, along with the raising of pH, the adsorption value of adsorbent B to rhodamine B increases thereupon, illustrate that the method for removing rhodamine B of the present invention is applicable to the treatment of alkaline wastewater, and the higher the pH, the better the treatment effect it is good.

Embodiment 2

[0033] Take adsorbent C and add it to pH=4.0, 600mg / L rhodamine B solution, wherein every 0.15g of adsorbent C corresponds to 50mL rhodamine B solution, and add sodium chloride at the same time so that the percentage mass concentration is 0%, 2%, respectively. 5%, 10%, 15%, 30%, after stirring or shaking at 45°C for 8 hours, filter and separate, adjust the filtrate to neutral and discharge.

[0034] The effect of sodium chloride concentration on the removal effect of rhodamine B is as follows: figure 2 shown. Depend on figure 2 It can be seen that the presence of sodium chloride is very beneficial to the removal of Rhodamine B. from figure 2 It can also be found that when the concentration of sodium chloride is between 2% and 30%, there is basically no difference in the adsorption amount of rhodamine B by adsorbent C.

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
adsorption capacityaaaaaaaaaa
adsorption capacityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for removing rhodamine B dye from wastewater by a walnut shell biomass charcoal adsorbent, belonging to the technical field of wastewater treatment. The method comprises the steps of adding the obtained walnut shell biomass charcoal adsorbent into wastewater which has the initial pH value of 2-11 and contains 200-100mg / L rhodamine B dye, adding sodium chloride at the same time to ensure that the mass percent concentration of the wastewater is 2%-30%, stirring or performing oscillating adsorption at 25-45 DEG C for 6h to 24h, then performing filtering separation, adjusting the filtrate to be neutral and then discharging the filtrate. The method disclosed by the invention is simple in operation and low in cost, avoids secondary pollution, and has industrialization prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for removing rhodamine B dye in wastewater by using a walnut shell biomass carbon adsorbent. Background technique [0002] Dyes are widely used in printing and dyeing, leather, paper, cosmetics, paint, rubber, plastics, pesticides, wood preservatives and other industries. Generally speaking, the discharge of wastewater containing 10-200mg / L dyes into natural waters will cause toxicity to organisms and even produce "three-caused" effects (ie, carcinogenic, mutagenic, and teratogenic effects). Dyes are difficult to decolorize due to their complex structure and refractory properties, which makes it necessary to remove dyes from wastewater. According to the chemical structure, dyes can be divided into azo dyes, anthraquinone dyes, triphenylmethane dyes, etc., among which azo dyes are the most widely used, followed by anthraquinone dyes. According t...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/20B01J20/30
Inventor 高景峰司春英杨辰
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap