Equilibrium and Kinetic Studies on Removal of Cd2+ Ion in Aqueous Solution by the Multiple Modified Diatomite

The problem of metal pollution was regarded by many researchers for a long time. The wastewater containing metal ions must be treated. A composite modification technology of acid activating, sodium hydroxide and baking was applied to improve the diatomite adsorption ability, and a modified diatomite...

Full description

Saved in:
Bibliographic Details
Published in:Nature environment and pollution technology 2017-12, Vol.16 (4), p.1249-1254
Main Authors: Wang, Hai, Huang, Chengcai, Qiu, Muqing, Hu, Chunxia
Format: Article
Language:English
Subjects:
Acids
Activated carbon
Adsorbates
Adsorption
Aqueous solutions
Cadmium
Caustic soda
Chemisorption
Diatomaceous earth
Equilibrium
Experiments
Kinetics
Membrane separation
Metal industry wastewaters
Metals
Methods
Reaction kinetics
Researchers
Sodium
Sodium hydroxide
Studies
Wastewater pollution
Wastewater treatment
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The problem of metal pollution was regarded by many researchers for a long time. The wastewater containing metal ions must be treated. A composite modification technology of acid activating, sodium hydroxide and baking was applied to improve the diatomite adsorption ability, and a modified diatomite was prepared. The adsorption experiment of the metal wastewater by the modified diatomite was carried out in detail. The modified diatomite owned the high adsorption capacity of the Cd2+ ion. The operating parameters, such as contact time, concentration of Cd2+ ion and reaction temperature, had an important effect on the removal of the Cd2+ ion in aqueous solution. The adsorption of Cd2+ ions onto the modified diatomite was 9.65 mg/g. The adsorption process fits well with the Langmuir isotherm model and the pseudo-second-order kinetics model and it implied that the adsorption was mainly a physical process. The adsorption process is chemisorption, which involves a sharing of electrons between the adsorbate and the surface of the adsorbent.
ISSN:0972-6268
2395-3454