title: Application of magnetically modified sewage sludge ash (SSA) in ionic dye adsorption.
abstract: Incineration is a traditional method of treating sewage sludge and the disposal of derived ash is a problem of secondary waste treatment. In this study, sewage sludge ash (SSA) was coated with ferrite through a ferrite process and then used as an adsorbent for ionic dyes (methylene blue [MB] and Procion Red MX-5B [PR]). The modified SSA possessed surface potential that provided electrostatic attraction toward MB and PR. Adsorbent FA10 (named on the basis of being produced from 10 g of SSA in the ferrite process) was used for the adsorption of MB. Ideal pH for adsorption was 9.0 and maximum adsorption capacity based on Langmuir isotherm equation was 22.03 mg/g. Adsorbent FA2.5 (named on the basis of being produced from 2.5 g of SSA in the ferrite process) was used for PR adsorption. Ideal pH for adsorption was 3.0 and the maximum adsorption capacity (calculated as above) was 28.82 mg/g. Kinetic results reveal that both MB and PR adsorption fit the pseudo-second-order kinetic model better than the pseudo-first-order model. The values of activation energy calculated from rate constants were 61.71 and 9.07 kJ/mol for MB and PR, respectively.
authors.forename: Shao-Hua
authors.initials: SH
authors.lastname: Hu
authors.forename: Shen-Chih
authors.initials: SC
authors.lastname: Hu
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D017745:Incineration; D007700:Kinetics; D008280:Magnetics; D008751:Methylene Blue / Q000302:isolation & purification*; D012722:Sewage / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D001391:Azo Compounds; C466318:Procion Red MX-5B; D012722:Sewage; D008751:Methylene Blue