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Kinetic studies on the removal of cadmium using Acacia tortilis
Author(s) -
Sivaprakash B.,
Rajamohan N.,
Qasmi Fatma Al
Publication year - 2020
Publication title -
environmental quality management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 27
eISSN - 1520-6483
pISSN - 1088-1913
DOI - 10.1002/tqem.21701
Subject(s) - cadmium , biosorption , chemistry , acacia , sulfuric acid , desorption , nuclear chemistry , chromatography , adsorption , botany , inorganic chemistry , sorption , biology , organic chemistry
In this study, the feasibility of utilizing Acacia tortilis biomass for the removal of cadmium ions was investigated. The effect of operating parameters, namely, initial pH (1–10), cadmium concentration (50–200 mg/L), biosorbent dose (0.5–4.0 g/L), and agitation speed (0–400 rpm), on the cadmium removal was investigated. Maximum removal efficiency was attained at pH 5.0, at an equilibrium time of 180 min. The maximum cadmium uptake achieved with 200 mg/L initial concentration was 36.66 mg/g. The mechanism of biosorption was analyzed using the pseudo‐first‐order, pseudo‐second‐order, and intraparticle diffusion models. The pseudo‐first‐order model represented the data well ( R 2 > 0.993), and the maximum uptake capacity was 45.83 mg/g at 30°C with 200 mg/L manganese concentration. Desorption studies confirmed the suitability of sulfuric acid as an eluent producing recoveries in excess of 90% for cadmium up to four cycles.