title: Silane grafted chitosan for the efficient remediation of aquatic environment contaminated with arsenic(V).
abstract: OBJECTIVE
  Chitosan, naturally abundant biomaterial showed an insignificant affinity toward arsenate. The incorporation of organosilane could improve the physical and chemical properties of chitosan for the efficient removal of arsenate from aquatic environment.
  
  
  METHODS
  The hybrid materials were obtained by grafting the natural biopolymer chitosan with 3-mercaptopropyl trimethoxysilane (CHMS) and trimethoxy-octylsilane (CHTS). The hybrid materials along with bare chitosan were characterized with SEM-EDX, FT-IR and BET specific surface area analyses and the solid materials were further employed in the efficient remediation of aqueous solutions contaminated with As(V) under batch and column reactor operations.
  
  
  RESULTS
  The hybrid materials showed an extremely high percentage of As(V) removal compared to bare chitosan within a wide range of pH. As(V) was aggregated rapidly onto the solid surfaces and relatively high percent removal of As(V) was achieved in a wide range of As(V) initial concentrations. Moreover, As(V) was bound with, relatively, weaker forces and forming an 'outer sphere complexes' at the surface of solids. The presence of co-existing ions could not significantly affect the removal of As(V) from aqueous solutions. Furthermore, breakthrough data confirmed that these two hybrid materials possessed significantly high loading capacity of As(V) even under dynamic conditions.
authors.affiliation: Department of Environmental Engineering, Catholic Kwandong University, 522 Naegok-dong, Gangneung 210-701, Republic of Korea.
authors.lastname: Lalhmunsiama
authors.affiliation: Department of Chemistry, School of Physical Sciences, Mizoram University, Aizawl 796004, India.
authors.lastname: Lalchhingpuii
authors.affiliation: Department of Horticulture, Aromatic and Medicinal Plant, Mizoram University, Aizawl 796004, India.
authors.forename: B P
authors.initials: BP
authors.lastname: Nautiyal
authors.affiliation: Department of Chemistry, School of Physical Sciences, Mizoram University, Aizawl 796004, India.
authors.forename: Diwakar
authors.initials: D
authors.lastname: Tiwari
authors.affiliation: Department of Environmental Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea.
authors.forename: S I
authors.initials: SI
authors.lastname: Choi
authors.affiliation: Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of Korea. Electronic address: shkong@hanyang.ac.kr.
authors.forename: Sung-Ho
authors.initials: SH
authors.lastname: Kong
authors.affiliation: Department of Environmental Engineering, Catholic Kwandong University, 522 Naegok-dong, Gangneung 210-701, Republic of Korea. Electronic address: leesm@cku.ac.kr.
authors.forename: Seung-Mok
authors.initials: SM
authors.lastname: Lee
mesh_terms: D001151:Arsenic / Q000737:chemistry / Q000302:isolation & purification*; D048271:Chitosan / Q000737:chemistry*; D010316:Particle Size; D012821:Silanes / Q000737:chemistry*; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D012821:Silanes; D014874:Water Pollutants, Chemical; D048271:Chitosan; D001151:Arsenic
keywords: As(V); Chitosan; Column reactor; Hybrid biomaterials; Silane grafted chitosan