Ozone and Ammonium Hydroxide Modification of Biochar Prepared from Pisum sativum Peels Improves the Adsorption of Copper (II) from an Aqueous Medium
| Autor: | Nabil M. Abdelmonem, Mohamed A. El-Nemr, Safaa Ragab, Ibrahim M. Ismail, Ahmed El Nemr |
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| Rok vydání: | 2020 |
| Předmět: |
Langmuir
Environmental Engineering Ozone Health Toxicology and Mutagenesis 0207 environmental engineering Energy-dispersive X-ray spectroscopy chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Pollution Copper chemistry.chemical_compound Ammonium hydroxide Adsorption chemistry Biochar Fourier transform infrared spectroscopy 020701 environmental engineering 0105 earth and related environmental sciences Water Science and Technology Nuclear chemistry |
| Zdroj: | Environmental Processes. 7:973-1007 |
| ISSN: | 2198-7505 2198-7491 |
| DOI: | 10.1007/s40710-020-00455-2 |
| Popis: | This study evaluated the effectiveness of unmodified and modified biochar derived from Pisum sativum peels waste biomass as an adsorbent of copper (II) from aqueous medium under batch adsorption experiments at room temperature. The unmodified biochar was chemically modified by ozone oxidation followed by reaction with ammonium hydroxide and labeled as Pea-B and Pea-BO-NH2. The adsorption behavior of Cu2+ ions and the effect of required experimental parameters as initial Cu2+ ions concentrations, biochar dose, reaction time, and pH were intensively studied. The unmodified biochar (Pea-B) and modified biochar (Pea-BO-NH2) had significant copper (II) adsorption capacities of 126.25 and 156.25 mg/g, respectively, with 100% removal efficiency. The prepared biochars were characterized by Brunauer, Emmett and Teller (BET), Barrett, Joyner, Halenda (BJH), Scan Electron Microscope (SEM), Fourier Transform Infrared (FTIR), Thermal gravimetrical analysis (TGA) and Energy Dispersive Spectroscopy (EDAX) analyses. EDAX and FTIR analyses proved that amino groups were successfully formed onto the modified biochar surface. The data of adsorption experiments at equilibrium were studied by using various isotherm models as well as the error function equations were applied to the data of isotherm models. The analysis of the experimental data of Pea-B and Pea-BO-NH2 biochars showed that the best fit isotherm models were the Langmuir and Tempkin isotherm models, respectively. The adsorption rate of copper (II) was analyzed using different kinetic models and the pseudo-second-order was expressed as the most appropriate model for both Pea-B and Pea-BO-NH2 biochars. |
| Databáze: | OpenAIRE |
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