Humic Acid Sorption Properties Of Calcium-rich
Derivatives Of Neapolitan Yellow Tuff
Author(s)
E. Coppola, P. Iovino, S. Salvestrini, S. Capasso & C. Colella
Abstract
With the objective of developing new agents for the removal of humic
substances from water, the sorption properties of Ca-enriched Neapolitan Yellow
Tuff (NYT), obtained by cation exchange at room temperature or by treatment
with CaCl2 at high temperature, were tested. Sorption of humic acids onto NYT
samples was evaluated at neutral pH and room temperature by batch sorption
tests and dynamic experiments on small columns. The salt-thermal treatment
gives rise to samples with higher calcium content and superior sorption ability.
For all the samples tested the sorption capacity increased with the contact time
between the solid phase and the humic acids solution. The Langmuir parameters
of the sorption isotherms and the breakthrough curves recorded by dynamic
experiments indicate that high-temperature Ca-enriched NYT exhibits sorption
properties higher than that recorded for commercial activated carbon and at least
comparable to those of other materials recently investigated.
Keywords: water purification; humic acid; zeolitic tuff, Ca-enriched zeolite.
1 Introduction
Humic substances (HS) are natural polymers containing aromatic blocks, with a
broad molecular weight distribution and high chemical heterogeneity. Produced
by biological decomposition of organic matter from plants and other organisms,
they account for about 50–80% of the organic matter in water from lakes and
rivers and other terrestrial sources. Typical total organic carbon values are 0.5
µg mL-1 in seawater, 7 µg mL-1 in rivers and 25 µg mL-1 in marshes and bogs.
Keywords
water purification; humic acid; zeolitic tuff, Ca-enriched zeolite.
Related Book
Other papers in this volume
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