Inorganic arsenic species removal from water using bone char: A detailed study on adsorption kinetic and isotherm models using error functions analysis
| Autor: | Les Bowtell, Susan S.A. Alkurdi, Raed A. Al-Juboori, Alla Marchuk, Jochen Bundschuh |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Diffusion Kinetics 0211 other engineering and technologies Analytical chemistry chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Arsenic Water Purification symbols.namesake Adsorption Environmental Chemistry Arsenic oxide Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Bone char Chemistry Water Langmuir adsorption model Hydrogen-Ion Concentration Pollution symbols Pyrolysis Water Pollutants Chemical |
| Zdroj: | Journal of Hazardous Materials. 405:124112 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2020.124112 |
| Popis: | The removal of inorganic arsenic (As) species from water using bone char pyrolyzed at 900 °C was investigated. Results revealed that the Sips model resulted in the best As(III) experimental data fit, while As(V) data were best represented by the Langmuir model. The adsorption rate and mechanisms of both As species were investigated using kinetic and diffusional models, respectively. At low As(III) and As(V) concentrations of 0.5 and 2.5 mg/L, the removal was due to intra-particle interactions and pore diffusion following Pseudo-first-order kinetics. However, at higher concentrations of 5 and 10 mg/L, the pore diffusion mechanism was ineffective, and the adsorption was best described by Pseudo-second-order and Elovich models. The goodness of the fit of linearized and nonlinear forms of all models against experimental data was thoroughly tested using error function analysis. Nonlinear regressions produced lower error values, so they were utilized to calculate the parameters of the models. The changes in bone char surface chemistry were examined using FTIR and Energy-dispersive X-ray spectroscopy (EDS). Arsenic oxide and complexes with metals were the confirmed immobilized forms of As on the bone-char surface. To the authors’ knowledge, this study is the first attempt at As(III) adsorption analysis using bone char. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect