title: Removal of heavy metals from aqueous solution by lipopeptides and lipopeptides modified Na-montmorillonite.
abstract: The removal of Cu(2+), Zn(2+), Cd(2+), Pb(2+) and Hg(2+) from aqueous solution by lipopeptides produced from solid-state fermentation (LPSSF) and LPSSF modified Na-montmorillonite clays (LPSSF/Na-MMT) was investigated. The results showed that the LPSSF had certain adsorption capability for the metal ions and the modification of Na-MMT with LPSSF at a weight ratio of 1:50 (LPSSF:Na-MMT) had the best adsorption capacity and adsorption rate. The adsorption of heavy metal ion on these adsorbents was monolayer sorption. And the rate limiting step of the adsorption process was thought as chemical sorption. The N-C-O and CC/CN groups of the LPSSF are the functional groups that were responsible for complexing the metal ions. The desorption rate of metal ions reached over 80% at 500 mg/L of LPSSF. The LPSSF/Na-MMT (1:50) was reusable and performed well in the complex system, indicating its potential application in wastewater treatment.
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: zzenabcd@126.com.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Gao
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Yanliang
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Lifei
authors.initials: L
authors.lastname: Sun
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Huang
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: ranwei@njau.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Ran
authors.affiliation: Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Qirong
authors.initials: Q
authors.lastname: Shen
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D055666:Lipopeptides / Q000737:chemistry*; D019216:Metals, Heavy / Q000302:isolation & purification*; D012964:Sodium / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D055666:Lipopeptides; D019216:Metals, Heavy; D001546:Bentonite; D012964:Sodium
keywords: Adsorption; Heavy metals; Lipopeptides; Modification; Na-montmorillonite