title: Optimization of Cadmium (CD(2+)) removal from aqueous solutions by novel biosorbent.
abstract: In this research, dead leaves of a common ornamental plant, Dracaena draca known also as dragon tree was used as a biosorbent for the removal of Cadmium (Cd(2+)) from aqueous solutions using a full 2(3) factorial experimental design. Three factors were investigated at two different levels, metal ion concentration (X = 10 and 100 ppm), hydrogen ion concentration (Ph = 2 and 7) and biomass dose (BD = 0.1 and 0.5g). Experiments were carried out in duplicates with 50 ml of Cd(2+) solutions at room temperature. When comparing observed values (experimental) with calculated values (model), they were set closely together that allowed suggesting a normal distribution where (R(2) = 0.9938). A characterization of the biosorbent was done by pHzpc and SEM-EDAX. Results also showed that the most significant effect for Cd(2+) biosorption was ascribed to (X). The interaction effects of (pH BD) and (X pH) were found to have significant influence on Cd(2+) removal efficiency. The highest Cd(2+) removal percentage attained by 79.60% at X = 10 ppm, pH = 7 and BD = 0.5g. The reusability of the biosorbent was tested in three desorption cycles and the regeneration efficiency was above 99.7%.
authors.affiliation: a Environmental Sciences Department , Faculty of Science, Alexandria University , Alexandria , Egypt.
authors.forename: Alaa El Din
authors.initials: Ael D
authors.lastname: Mahmoud
authors.affiliation: a Environmental Sciences Department , Faculty of Science, Alexandria University , Alexandria , Egypt.
authors.forename: Manal
authors.initials: M
authors.lastname: Fawzy
authors.affiliation: b Physical Oceanography Department , National Institute of Oceanography and Fisheries , Alexandria , Egypt.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Radwan
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000737:chemistry* / Q000378:metabolism; D031409:Dracaena / Q000737:chemistry* / Q000378:metabolism; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D018515:Plant Leaves / Q000737:chemistry* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: biosorption; desorption; factorial experimental design