title: Optimizing adsorption of Pb(II) by modified litchi pericarp using the response surface methodology.
abstract: Litchi pericarp was chemically modified as a novel bioadsorbent (MLP) for Pb(II) adsorption in this study. Operating parameters such as contact time, adsorbent dosage, and initial pH of solution were investigated using batch assays and further optimized using response surface methodology (RSM). The results showed that the MLP exhibited a high adsorption efficiency of 99.97% for Pb(II), which was optimal at a contact time of 71.56min, a initial pH of 6.81, and an adsorbent dose of 3.80g/L. Adsorption processes of Pb(II) by MLP could be well described with Langmuir or Freundlich isotherms and a pseudo-second-order kinetic model. The maximum adsorption capacity of Pb(II) by MLP was determined as 163.93mg/g, suggesting a highly promising potential for MLP to be used as a new bioadsorbent. Additionally, the thermodynamic study indicated that the adsorption process of Pb(II) by MLP was spontaneously and exothermic.
authors.affiliation: College of Resources and Environment, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Shujuan
authors.initials: S
authors.lastname: Sun
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Jili
authors.initials: J
authors.lastname: Yang
authors.affiliation: College of Resources and Environment, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai׳an, Shandong 271018, PR China. Electronic address: lixiaochen02@163.com.
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Li
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D032125:Litchi / Q000737:chemistry*; D013223:Statistics as Topic; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead
keywords: Adsorption; Modified litchi pericarp; Pb(II); Response surface methodology(RSM)