title: Removal of Cd (II) from synthetic wastewater by alginate-Ayous wood sawdust (Triplochiton scleroxylon) composite material.
abstract: The biosorption characteristics of Cd (II) ions from synthetic wastewater using raw Ayous wood sawdust (Triplochiton scleroxylon), r-AS, immobilized by sodium alginate were investigated with respect to pH, biomass quantity, contact time, initial concentration of heavy metal, temperature and stirring rate. The experimental data fitted well with the Langmuir isotherm, suggesting that monolayer adsorption of the cadmium ions onto alginate-Ayous sawdust composite (a-ASC). The obtained monolayer adsorption capacity of a-ASC for Cd (II) was 6.21 mg/g. From the Dubinin-Radushkevich isotherm model, a 5.39 kJ/mol value for the mean free energy was calculated, indicating that Cd (II) biosorption could include an important physisorption stage. Thermodynamic calculations showed that the Cd (II) biosorption process was feasible, endothermic and spontaneous in nature under examined conditions. The results indicated that a-ASC could be an alternative material replacing more costly adsorbents used for the removal of heavy metals.
authors.affiliation: a Faculty of Chemistry and Chemical Engineering , Babeş-Bolyai University , Chemical Engineering Department, 11, Arany Janos st., RO-400028, Cluj-Napoca , Romania.|b Laboratory of Analytical Chemistry, Faculty of Sciences , University of Yaoundé I , PO Box 812 , Yaoundé , Cameroon.
authors.forename: Jacques Romain
authors.initials: JR
authors.lastname: Njimou
authors.affiliation: a Faculty of Chemistry and Chemical Engineering , Babeş-Bolyai University , Chemical Engineering Department, 11, Arany Janos st., RO-400028, Cluj-Napoca , Romania.
authors.forename: Andrada
authors.initials: A
authors.lastname: Măicăneanu
authors.affiliation: a Faculty of Chemistry and Chemical Engineering , Babeş-Bolyai University , Chemical Engineering Department, 11, Arany Janos st., RO-400028, Cluj-Napoca , Romania.
authors.forename: Cerasella
authors.initials: C
authors.lastname: Indolean
authors.affiliation: b Laboratory of Analytical Chemistry, Faculty of Sciences , University of Yaoundé I , PO Box 812 , Yaoundé , Cameroon.
authors.forename: Charles Péguy
authors.initials: CP
authors.lastname: Nanseu-Njiki
authors.affiliation: b Laboratory of Analytical Chemistry, Faculty of Sciences , University of Yaoundé I , PO Box 812 , Yaoundé , Cameroon.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Ngameni
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D018533:Biomass; D002104:Cadmium / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D019660:Malvaceae / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014934:Wood / Q000737:chemistry*
chemical_list: D000464:Alginates; D002104:Cadmium; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Ayous sawdust; Cd (II); alginate beads; composite; wastewater