title: Mechanistic aspects of nitrogen-heterocyclic compound adsorption on bamboo charcoal.
abstract: Adsorption of three nitrogen-heterocyclic compounds (NHCs), pyridine, indole, and quinoline, on a new porous carbonaceous adsorbent, bamboo charcoal (BC), is investigated. Different structures and surface properties of BC are created by HNO(3) and NaOH treatment as well as by microwave (MW) radiation. HNO(3) treatment decreases surface area, micropore volume, and surface hydrophobicity, whereas NaOH treatment increases surface area and micropore volume. MW treatment dramatically increases hydrophobicity and fraction of aromatic structure. Adsorption isotherms of NHCs are nonlinear and better fitted by Freundlich model (FM) compared with Langmuir model (LM) and Polanyi-Manes model (PMM). The maximum adsorption capacities for pyridine, indole, and quinoline reach 42.92, 93.24, and 91.74mg g(-1), respectively, at an initial concentration of 200mg L(-1). Surface area, hydrophobicicty, and electrostatic and π-π electron-donor-acceptor (EDA) interactions are accountable for NHC adsorption. A model relating NHC adsorption (log K) and adsorbent-adsorbate physicochemical properties is developed to measure the relative contribution of these interactions giving the sequence of surface area>hydrophobic interaction>electrostatic interaction>π-π EDA interaction.
authors: State Key Lab of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China.
authors: Peng
authors: P
authors: Liao
authors: Songhu
authors: S
authors: Yuan
authors: Wenbiao
authors: W
authors: Zhang
authors: Man
authors: M
authors: Tong
authors: Kun
authors: K
authors: Wang
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D007211:Indoles / Q000302:isolation & purification*; D008956:Models, Chemical; D016062:Porosity; D011725:Pyridines / Q000302:isolation & purification*; D011804:Quinolines / Q000302:isolation & purification*; D031787:Sasa / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D007211:Indoles; D011725:Pyridines; D011804:Quinolines; D014874:Water Pollutants, Chemical; D002606:Charcoal; C030374:indole; C037219:quinoline; C023666:pyridine