title: Preparation and Characterization of Biochars from Eichornia crassipes for Cadmium Removal in Aqueous Solutions.
abstract: The study investigated the preparation and characterization of biochars from water hyacinth at 300°C to 700°C for cadmium (Cd) removal from aqueous solutions. The adsorption process was dominated by oxygen-containing functional groups with irregular surfaces via esterification reactions. Furthermore, the mineral components in the biochars also contributed to Cd absorption through precipitation. Parameters such as the effects of solution pH, contact time, and initial concentration were studied. The optimum pH value was observed at 5.0, in which nearly 90% of Cd was removed. The maximum Cd adsorption capacities based on the Langmuir isotherm were calculated at 49.837, 36.899, and 25.826 mg g(-1). The adsorption processes of the biochars followed the pseudo-second-order kinetics, with the equilibrium achieved around 5 h. The biochar from E. crassipes is a promising adsorbent for the treatment of wastewater, which can in turn convert one environmental problem to a new cleaning Technology.
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.|State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Kaixuan
authors.initials: K
authors.lastname: Shen
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Long
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Jiasheng
authors.initials: J
authors.lastname: Wen
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Xie
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Xiangyun
authors.initials: X
authors.lastname: Zeng
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Liang
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Yansha
authors.initials: Y
authors.lastname: Wei
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Zefeng
authors.initials: Z
authors.lastname: Lin
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Wenrou
authors.initials: W
authors.lastname: Huang
authors.affiliation: School of Civil Engineering, South China University of Technology, Guangzhou, 510640, China.
authors.forename: Ruida
authors.initials: R
authors.lastname: Zhong
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry*; D031806:Eichhornia / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D058865:Introduced Species; D008422:Materials Testing; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D002104:Cadmium; D002606:Charcoal; D012996:Solutions; D062065:Wastewater; D014874:Water Pollutants, Chemical; D015032:Zinc; C540010:biochar