NDLI: Comparative study of 17β-estradiol removal from aqueous solutions using pine bark and almond shell as adsorbents

Content Provider	Springer Nature Link
Author	Braga, Fernando G. Pinto, Sandra Antunes, Maria Cristina G.
Copyright Year	2010
Abstract	We have investigated the adsorption of the endocrine disruptor 17ß-estradiol (E2) on pine bark and almond shell. These traditional Portuguese agro-forestry by-products were milled, sieved into different particle size fractions and submitted to two different kinds of treatment. Adsorption experiments were conducted in batch system at room temperature and at pH 4.75 and 6.80, respectively, for pine bark and almond shell. E2 was more effectively adsorbed on 100 to 150 μm particles of both sorbents. Pine bark washed with hot water and pine bark treated with formaldehyde showed higher percentage of adsorption than any other material tested at doses of 5.0 g L−1. The adsorption was of comparable efficiency in case of almond shells at doses of around 20 g L−1. In this case, the percentage of adsorption was found to be 88 and 90% for the sorbents treated with formaldehyde or washed with hot water. The adsorption isotherms were found to fit a Freundlich equation, with correlation coefficients (R2) between 0.904 and 0.998. The sorption coefficient (KF) ranged from 0.03 to 29.9 (mg1−1/n L1/n g−1). The differences observed among the adsorption capacities are discussed in terms of physico-chemical characterization of the materials. Figure (a) % adsorption as function of pine bark mass. pH = 4.75, [E2] = 1.0 mg L-1 for P(+), P(-), Pw(+) and Pt(+), [E2] = 3.0 mg L-1 for Pw(-) and Pt(-), solution volume: 50 mL, 25°C, contact time: 72 hours (b) % adsorption as function of almond shell mass. pH = 6.80, [E2] = 1.0 mg L -1 for all sorbents, solution volume: 50 mL, 25°C, contact time: 72 hours
Starting Page	111
Ending Page	117
Page Count	7
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	173
Issue Number	1-2
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2011-01-06
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	17β-Estradiol Adsorption Pine bark Almond shell Nanotechnology Nanochemistry Analytical Chemistry Characterization and Evaluation of Materials Microengineering
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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