Removal of Pb2+ ions from aqueous medium by using chitosan-diatomite composite: equilibrium, kinetic and thermodynamic studies

Year 2020, , 307 - 318, 15.02.2020

Zeynep Mine Şenol , Selçuk Şimşek

https://doi.org/10.18596/jotcsa.634590

Cited By: 5

Abstract

Abstract: In
this study, a novel, low-cost, natural, and highly effective
adsorbent, chitosan (Ch) -diatomite (D) composite was synthesized.
Ch-D composite
was tested as
an effective and alternative adsorbent for the removal of Pb²⁺
ions. The Ch-D composite
was characterized by FT-IR, SEM-EDX and PZC analyses. The
adsorption process
of Pb²⁺
ions onto Ch-D as initial lead concentration, solution
pH, temperature,
contact time and
recovery was
investigated. From
the adsorption process results, it has been observed that the highest
removal efficiency is approximately 95% at a contact time of 4-hour,
initial Pb²⁺
concentration
of 500 mg L^-1
and agitation speed of 150 rpm at natural pH 4.0.
The maximum Pb²⁺
adsorption
capacity from the Langmuir model was found
as 0.154
mol kg^-1
at 25 ^oC.
Besides,
adsorption kinetics was also explained with pseudo-first-order
models. Adsorption
thermodynamics have shown that Pb²⁺
adsorption onto Ch-D is possible, spontaneous and exothermic. Ch-D
composite can become an alternative adsorbent for the treatment of
lead ions in the wastewater.

Keywords

Diatomite, chitosan, composite, adsorption, lead

Supporting Institution

Sivas Cumhuriyet Üniversitesi

Project Number

ZARA004

Thanks

The present study (Project no: ZARA004) was supported by the Cumhuriyet University Scientific Research Projects Commission. The authors strongly declare that no scientific and/or financial conflicts of interest, exists with other people or institutions.

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