title: Study of adsorption mechanism of heavy metals onto waste biomass (wheat bran).
abstract: In this study, raw wheat bran (R-WB), a type of waste biomass (WB) was treated with Pectinase PL (P-WB), and the properties (yield percentage, carboxy group surface concentration, the solution pH, and specific surface area) of R-WB and P-WB were investigated. The surface concentration of carboxy groups on R-WB (3.56 mmol/g) was greater than that of P-WB (2.11 mmol/g). In contrast, the specific surface area of P-WB (24.98 m²/g) was greater than that of R-WB (3.25 m²/g). In addition, the adsorption of cadmium and lead ions to WB was evaluated. Adsorption of the heavy-metal ions reached equilibrium within 9 h, and the experimental data was fitted to a pseudo-second-order model. More heavy-metal ions were adsorbed onto R-WB than onto P-WB. The correlation coefficient between the amount of ions adsorbed and the number of carboxy groups or pectin exceeded 0.884 and 0.975, respectively. This study indicated that wheat bran was useful for the removal of cadmium or lead ions from aqueous solutions. The adsorption mechanism of cadmium and lead ions to WB was associated with presence of carboxy group in pectin.
authors.affiliation: Faculty of Pharmacy, Kinki University.
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Ogata
authors.forename: Moe
authors.initials: M
authors.lastname: Kangawa
authors.forename: Hisato
authors.initials: H
authors.lastname: Tominaga
authors.forename: Yuko
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Ayaka
authors.initials: A
authors.lastname: Ueda
authors.forename: Yuka
authors.initials: Y
authors.lastname: Iwata
authors.forename: Naohito
authors.initials: N
authors.lastname: Kawasaki
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D002264:Carboxylic Acids / Q000737:chemistry*; D055598:Chemical Phenomena; D004043:Dietary Fiber / Q000032:analysis; D005511:Food Handling; D007477:Ions; D007854:Lead / Q000302:isolation & purification*; D010368:Pectins / Q000737:chemistry; D011096:Polygalacturonase / Q000737:chemistry / Q000378:metabolism*; D012996:Solutions; D013997:Time Factors; D014866:Waste Products; D062065:Wastewater; D014867:Water; D018508:Water Purification / Q000379:methods
chemical_list: D002104:Cadmium; D002264:Carboxylic Acids; D004043:Dietary Fiber; D007477:Ions; D007854:Lead; D010368:Pectins; D011096:Polygalacturonase; D012996:Solutions; D014866:Waste Products; D062065:Wastewater; D014867:Water; C003181:polygalacturonic acid