Enhanced adsorption and recovery of Pb(II) from aqueous solution by alkali‐treated persimmon fallen leaves

Abstract

Persimmon fallen leaves were employed to prepare a renewable and low-cost biosorbent named as NPFL. Effects of initial pH, contact time, initial Pb(II) concentration, coexisting metal ions, and ionic strength on adsorption of Pb(II) from aqueous solution by NPFL were studied in detail. Enhanced removal capacity of NPFL toward Pb(II) was observed, and the maximum adsorption capacity was evaluated as 256 mg g 21 by Langmuir modeling calculation. The fast adsorption process and the well-fitted kinetics data with pseudo-second-order model indicated that chemisorption is the main rate-limiting step for the adsorption process. NPFL had superior adsorption selectivity for Pb(II) from aqueous solution with coexisting metal ions. Characterization of NPFL and adsorption mechanism (electrostatic attraction, ion exchange, and chelation) were performed using XRD, SEM-EDS, FT-IR, XPS, and TGA. The results suggested that NPFL could be utilized as a potential candidate for the preconcentration of Pb(II) recovery and its removal in practice.

Phosphorylated cellulose/electrospun chitosan nanofibers media for removal of heavy metals from aqueous solutions

“…Lakhdhar et al 53 used CS/PEO nanofibers to adsorb Cu (II) and obtained an experimental adsorption capacity of approximately 100 mg/g, which is not far from the result of this study (74.53 mg/g). A novel g‐C 3 N 4 /MnO 2 composite was prepared by Guo et al 54 by in situ deposition of MnO 2 on graphitic carbon nitride (g‐C 3 N 4 ) nanosheets and Fan et al 55 prepared an alkali‐treated persimmon fallen leaves for removal of Pb (II) in aqueous solutions. Arshadi et al 56 , Kataria et al, 57 and Melo et al 58 used barley straw ash, ZnO nanoflowers, and tururi fibers, respectively, for adsorption of Cd (II) aqueous solutions.…”

miRNA858b Inhibits Proanthocyanidin Accumulation by Repression ofDkMYB19andDkMYB20in Persimmon

“…The persimmon PA is the phenolic compounds, which has been associated with biological activities, including inhibition and antiviral, antianaphylaxis, prevention of cardiovascular and cerebrovascular diseases, anti-tumor, promotion of immunity and antioxidant activity (Zhang et al ., 2008). Morever, the persimmon PA is a kind of natural and eco-friendly adsorbent, it could be used to precious metal adsorption (Xie et al ., 2016; Fan et al ., 2019), water purification (Fan et al ., 2016), soil water retention (Luo et al ., 2019).…”