title: Adsorption of dyestuff from aqueous solutions through oxalic acid-modified swede rape straw: adsorption process and disposal methodology of depleted bioadsorbents.
abstract: Swede rape straw (Brassica napus L.) was modified by oxalic acid under mild conditions producing an efficient dye adsorbent (SRSOA). This low-cost and environmental friendly bioadsorbent was characterized by various techniques and then applied to purify dye-contaminated aqueous solutions. Equilibrium study showed that the Langmuir model demonstrated the best fit to the equilibrium data and the methylene blue (MB) adsorption capacity calculated by this model was 432mgg(-1). The adsorption process and mechanism is also discussed. To properly deal with the dye-loaded bioadsorbents, the disposal methodology is discussed and a biochar based on depleted bioadsorbents was for the first time produced and examined. This method both solved the disposal problem of contaminant-loaded bioadsorbents and produced an useful adsorbent thereafter. The study indicates that SRSOA is a promising substitute for ACs in purifying dye-contaminated wastewater and that producing biochars from contaminant-loaded bioadsorbents maybe a feasible disposal method.
authors.affiliation: Jiangsu Academy of Agriculture Sciences, Nanjing 210014, PR China. yanjieyanfang@163.com
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Feng
authors.forename: Dionysios D
authors.initials: DD
authors.lastname: Dionysiou
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Wu
authors.forename: Hui
authors.initials: H
authors.lastname: Zhou
authors.forename: Lihong
authors.initials: L
authors.lastname: Xue
authors.forename: Shiying
authors.initials: S
authors.lastname: He
authors.forename: Linzhang
authors.initials: L
authors.lastname: Yang
mesh_terms: D000327:Adsorption / Q000187:drug effects; D001673:Biodegradation, Environmental / Q000187:drug effects; D029688:Brassica napus / Q000187:drug effects* / Q000378:metabolism; D002606:Charcoal / Q000494:pharmacology; D004396:Coloring Agents / Q000302:isolation & purification*; D007700:Kinetics; D008751:Methylene Blue / Q000302:isolation & purification; D019815:Oxalic Acid / Q000494:pharmacology*; D010316:Particle Size; D012037:Refuse Disposal / Q000191:economics / Q000379:methods*; D012996:Solutions; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D013997:Time Factors; D014866:Waste Products / Q000032:analysis*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D002606:Charcoal; D004396:Coloring Agents; D008751:Methylene Blue; D019815:Oxalic Acid; D012996:Solutions; D014866:Waste Products; D062065:Wastewater; D014874:Water Pollutants, Chemical; C540010:biochar