We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
高锰酸钾改性铁泥生物炭对镉砷的吸附特性.
- Authors
陈天来; 廖长君; 黎秋君; 张新英; 谢沛羲; 刘娟娟
- Abstract
A new zero-valent iron biochar (FMBC) loaded with manganese oxides was prepared by the impregnation-pyrolysis method using iron sludge (IS) as raw material and potassium permanganate as modifier. The effects of pH, adsorption time and initial concentration on the adsorption effect of FMBC were investigated by batch adsorption experiments with Cd(Ⅱ) and As(Ⅲ) as the target pollutants, and the adsorption mechanism was explored by combining XPS, FTIR and XRD characterization. The results showed that the surface of FMBC was rough, rich pore structure and functional groups. Zerovalegnt iron and iron-manganese oxides were the main crystalline phases of FMBC. The adsorption rate of FMBC on Cd(Ⅱ) gradually increased with the increase of the initial pH of the solution (2~6), and the adsorption rate of As(Ⅲ) did not changed at pH<6. The adsorption processes of both Cd(Ⅱ) and As(Ⅲ) by FMBC are dominated by non-homogeneous chemisorption, and the adsorption of Cd(Ⅱ) is dominated by multilayer adsorption, and the adsorption of As(Ⅲ) is dominated by monolayer adsorption, while multilayer adsorption on inhomogeneous surfaces also exists. The theoretical maximum adsorption capacities of Cd(Ⅱ) and As(Ⅲ) were 95.34 mg/g and 116.83 mg/g, respectively, which were 15.9% and 39.18% higher than those before modification. Cd(Ⅱ) was mainly adsorbed on FMBC through co-precipitation, complexation reaction, ion exchange, redox and cation-π interaction, and As(Ⅲ) was mainly adsorbed by FMBC through redox, complexation and ion exchange. The research results can provide scientific basis and technical support for the resource utilization of iron mud and the treatment of Cd(Ⅱ) and As(Ⅲ) pollution.
- Subjects
POROSITY; COMPLEXATION reactions; IRON; ADSORPTION capacity; POTASSIUM permanganate; ARSENIC removal (Water purification)
- Publication
Environmental Science & Technology (10036504), 2023, Vol 46, Issue 5, p192
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.0050.23.338