title: Bioremediation of cadmium-contaminated water systems using intact and alkaline-treated alga (Hydrodictyon reticulatum) naturally grown in an ecosystem.
abstract: Cadmium can enter water, soil, and food chain in amounts harmful to human health by industrial wastes. The use of intact and NaOH-treated dried algal tissues (Hydrodictyon reticulatum), a major ecosystem bio-component, for Cd removal from aqueous solutions was characterized. Cadmium biosorption was found to be dependent on solution pH, bioadsorbent dose, the interaction between pH and dose, contact time, and initial Cd concentration. The experimental results indicated that the biosorption performance of alkaline-treated algal tissues was better than that of intact tissues. The maximum biosorption capacities were 7.40 and 12.74 mg g-1for intact and alkaline-treated bioadsorbents, respectively, at optimum operating conditions. Biosorption reaches equilibrium after 24 and 240 minutes of contact, respectively, for alkaline-treated and intact bioadsorbents. Cadmium biosorption was best fitted to Langmuir isotherm model (R2≈ 0.99) and the kinetic study obeyed the pseudo-second-order kinetic model, which suggests chemisorption as the rate-limiting step in the biosorption process. Alkaline-treated algal tissues can be used as a new material of low-cost bioadsorbent for continuous flow rate treatment systems.
authors.affiliation: a Department of Water Resources and Environmental Management , Faculty of Agricultural Technology, Al-Balqa' Applied University , Al-Salt , Jordan.
authors.forename: Tarek G
authors.initials: TG
authors.lastname: Ammari
authors.affiliation: a Department of Water Resources and Environmental Management , Faculty of Agricultural Technology, Al-Balqa' Applied University , Al-Salt , Jordan.
authors.forename: Marrwa
authors.initials: M
authors.lastname: Al-Atiyat
authors.affiliation: b Department of Chemistry , Faculty of Science, Al-Balqa' Applied University , Al-Salt , Jordan.
authors.forename: Eyad S
authors.initials: ES
authors.lastname: Abu-Nameh
authors.affiliation: c Royal Scientific Society , Amman , Jordan.
authors.forename: Ayoup
authors.initials: A
authors.lastname: Ghrair
authors.affiliation: b Department of Chemistry , Faculty of Science, Al-Balqa' Applied University , Al-Salt , Jordan.
authors.forename: Da'san
authors.initials: D
authors.lastname: Jaradat
authors.affiliation: d Department of Biotechnology , Faculty of Agricultural Technology, Al-Balqa' Applied University , Al-Salt , Jordan.
authors.forename: Saeid
authors.initials: S
authors.lastname: Abu-Romman
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000378:metabolism*; D000460:Chlorophyta / Q000254:growth & development / Q000378:metabolism*; D007597:Jordan; D007700:Kinetics; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Cd-contaminated environment; Freundlich and Langmuir isotherm models; Hydrodictyon reticulatum; chemically modified algae; pseudo-second-order kinetic model