title: Biosorption of cadmium(II) and copper(II) ions from aqueous solution by core of Artocarpus odoratissimus.
abstract: OBJECTIVE
  This research is on the evaluation of biosorption capability of the core of Artocarpus odoratissimus (Tarap), grown in Brunei Darussalam, towards Cd(II) and Cu(II) ions present in synthetic solutions, and to characterize the surface of Tarap particles.
  
  
  METHODS
  Thermogravimetric analysis and surface titrations were conducted to characterize the surface of dried Tarap core particles. Atomic absorption spectroscopic measurements were conducted to determine the extent of removal of Cd(II) and Cu(II) under different experimental conditions.
  
  
  RESULTS
  Mass reductions associated with many exothermic reaction peaks were observed beyond 200°C up to 650°C indicating the combustion of organic matter in Tarap. Dried particles of core of Tarap bear a negative surface charge promoting strong interaction towards positively charged ions, such as Cu(II) and Cd(II). Biosorption of the two metal ions on Tarap, which is relatively high beyond pH = 4, occurs within a short period of exposure time. The extent of biosorption is enhanced by acid treatment of the biosorbent, and further it does not significantly depend on the presence of nonreacting ions up to an ionic strength of 2.0 M.
  
  
  CONCLUSIONS
  Strong attraction between each metal ion and the biosorbent is attributed to the negative surface charge on the biosorbent within a broad pH range. Acid treatment of the biosorbent improves sorption characteristics, suggesting that ion exchange plays an important role in the metal ion-biosorbent interaction process.
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410 Negara, Brunei Darussalam.
authors.forename: Linda B L
authors.initials: LB
authors.lastname: Lim
authors.forename: Namal
authors.initials: N
authors.lastname: Priyantha
authors.forename: D T B
authors.initials: DT
authors.lastname: Tennakoon
authors.forename: Muhd Khairud
authors.initials: MK
authors.lastname: Dahri
mesh_terms: D000327:Adsorption; D031622:Artocarpus / Q000737:chemistry*; D002104:Cadmium / Q000302:isolation & purification*; D003300:Copper / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D009994:Osmolar Concentration; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D014867:Water; D003300:Copper