title: Iron [Fe(0)]-rich substrate based on iron-carbon micro-electrolysis for phosphorus adsorption in aqueous solutions.
abstract: The phosphorus (P) adsorption properties of an iron [Fe(0)]-rich substrate (IRS) composed of iron scraps and activated carbon were investigated based on iron-carbon micro-electrolysis (IC-ME) and compared to the substrates commonly used in constructed wetlands (CWs) to provide an initial characterization of the [Fe(0)]-rich substrate. The results showed that P was precipitated by Fe(III) dissolved from the galvanic cell reactions in the IRS and the reaction was suppressed by the pH and stopped when the pH exceeded 8.90 ± 0.09. The adsorption capacity of the IRS decreased by only 4.6% in the second round of adsorption due to Fe(0) consumption in the first round. Substrates with high Ca- and Mg-oxide contents and high Fe- and Al-oxide contents had higher P adsorption capacities at high and low pH values, respectively. Substrates containing high Fe and Al concentrations and low Ca concentrations were more resistant to decreases in the P adsorption capacity resulting from organic matter (OM) accumulation. The IRS with an iron scrap to activated carbon volume ratio of 3:2 resulted in the highest P adsorption capacity (9.34 ± 0.14 g P kg-1), with minimal pH change and strong adaptability to OM accumulation. The Fe(0)-rich substrate has the considerable potential for being used as a CW substrate.
authors.affiliation: School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China. Electronic address: shdeng@bjtu.edu.cn.
authors.forename: Shihai
authors.initials: S
authors.lastname: Deng
authors.affiliation: School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China. Electronic address: dsli@bjtu.edu.cn.
authors.forename: Desheng
authors.initials: D
authors.lastname: Li
authors.affiliation: School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China.
authors.forename: Xue
authors.initials: X
authors.lastname: Yang
authors.affiliation: School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.affiliation: School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China; Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing, 100044, PR China.
authors.forename: Jinlong
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D002606:Charcoal; D004572:Electrolysis; D007501:Iron / Q000737:chemistry*; D008956:Models, Chemical; D009930:Organic Chemicals; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D053833:Wetlands
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D002606:Charcoal; D010758:Phosphorus; D002244:Carbon; D007501:Iron
keywords: Iron [Fe(0)]–rich substrate; Iron scraps; Iron–carbon micro–electrolysis; Langmuir adsorption isotherm; Organic matter; Phosphorus