The acid–base, morphological and structural properties of new biosorbent obtained by oxidative hydrothermal treatment of peat

Samples of natural peat (NP) were hydrothermally treated at different temperatures in oxidative and acidic aqueous medium to tailor their acid–base, adsorption, morphological and other properties. The obtained materials were thoroughly characterized by SEM, XRD and FTIR techniques, followed by deter...

Full description

Saved in:
Bibliographic Details
Published in:Environmental earth sciences 2016-05, Vol.75 (9), p.1-10, Article 764
Main Authors: Ranđelović, M., Momčilović, M., Purenović, M., Zarubica, A., Bojić, A.
Format: Article
Language:English
Subjects:
Acids
Adsorption
Biogeosciences
Earth and Environmental Science
Earth Sciences
Environmental Science and Engineering
Geochemistry
Geology
Hydrology/Water Resources
Leaching
Organic matter
Original Article
Oxidation
Peat
Peatlands
Phenols
Terrestrial Pollution
Water pollution
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Samples of natural peat (NP) were hydrothermally treated at different temperatures in oxidative and acidic aqueous medium to tailor their acid–base, adsorption, morphological and other properties. The obtained materials were thoroughly characterized by SEM, XRD and FTIR techniques, followed by determination of pH pzc , examination of adsorption characteristics and the extent of organic matter leaching in water. Acid–base characteristics of these materials were examined by potentiometric and conductometric titration of corresponding aqueous suspensions. Experimental potentiometric data were interpreted using ProtoFit software (NEM, non-electrostatic model) which provided p K a values and concentrations of surface sites which are compared with corresponding values obtained by conductometric titration method. There are two main types of surface groups (carboxylic and phenolic) that are dominant in the materials and determine their acid–base behavior in the aqueous medium. Temperature during oxidative hydrothermal treatment has no significant effect on the total number of surface groups, but influences the ratio of carboxylic and phenol-type groups. Hence, acid–base properties of peat can be tailored, which is useful in designing and improving adsorptive characteristics of peat for the preferential removal of certain pollutants from water.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-016-5242-0