title: The role of nano-sized manganese coatings on bone char in removing arsenic(V) from solution: Implications for permeable reactive barrier technologies.
abstract: Although the removal of arsenic(V) (As(V)) from solution can be improved by forming metal-bearing coatings on solid media, there has been no research to date examining the relationship between the coating and As(V) sorption performance. Manganese-coated bone char samples with varying concentrations of Mn were created to investigate the adsorption and desorption of As(V) using batch and column experiments. Breakthrough curves were obtained by fitting the Convection-Diffusion Equation (CDE), and retardation factors were used to quantify the effects of the Mn coatings on the retention of As(V). Uncoated bone char has a higher retention factor (44.7) than bone char with 0.465 mg/g of Mn (22.0), but bone char samples with between 5.02 mg/g and 14.5 mg/g Mn have significantly higher retention factors (56.8-246). The relationship between retardation factor (Y) and Mn concentration (X) is Y = 15.1 X + 19.8. Between 0.2% and 0.6% of the sorbed As is desorbed from the Mn-coated bone char at an initial pH value of 4, compared to 30% from the uncoated bone char. The ability of the Mn-coated bone char to neutralize solutions increases with increased amounts of Mn on the char. The results suggest that using Mn-coated bone char in Permeable Reactive Barriers would be an effective method for remediating As(V)-bearing solutions such as acid mine drainage.
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China; The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing, 100083, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China.
authors.forename: Lile
authors.initials: L
authors.lastname: He
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China.
authors.forename: Faqin
authors.initials: F
authors.lastname: Dong
authors.affiliation: Department of Earth and Planetary Sciences, Birkbeck, University of London, Malet St., London, WC1E 7HX, UK. Electronic address: k.hudson-edwards@bbk.ac.uk.
authors.forename: Karen A
authors.initials: KA
authors.lastname: Hudson-Edwards
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000737:chemistry*; D001842:Bone and Bones; D002606:Charcoal / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D008345:Manganese / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D012996:Solutions; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D008345:Manganese; D001151:Arsenic
keywords: As(V); Breakthrough curve; Mn-coated bone char; Neutralization; Permeable reactive barrier (PRB); Sorption