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Ammonium removal from aqueous solutions by fixed-bed column using corncob-based modified biochar
- Nguyen, Lan Huong, Vu, Thi Mai, Le, Thi Trinh, Trinh, Van Tuyen, Tran, Thi Pha, Van, Huu Tap
- Environmental technology 2019 v.40 no.6 pp. 683-692
- adsorbents, adsorption, ammonium, aqueous solutions, binding sites, biochar, corn cobs, environmental technology, models, nitric acid, sodium chloride, sodium hydroxide
- This study investigated the potential of removing ammonium () from aqueous solutions using corncob based on modified biochar (MBCC) in the fixed-bed column. Corncob biochar was soaked in a mixture of HNO₃ 6.0 M and NaOH 0.3 M to prepare active binding sites for ammonium removal. The effect of initial ammonium concentrations (10–40 mg/L), flow rates (1–9 mL/min) and MBCC fixed-bed heights (8–24 cm) on the breakthrough characteristics of the adsorption system were studied. The results showed that the highest adsorption capacity of fix-bed column, the breakthrough time and value of Cₜ/Cₒ were 12.83 mg/g, 480 min and 0.862 ± 0.025 at 10 mg/L of initial ammonium concentration, 8 cm of MBCC fixed-bed height and 3 mL/min of flow rate, respectively. The breakthrough curve model in this study also indicated that all Yoon–Nelson, Thomas and Adam–Bohart models well fit with the experimental data with a high R². The results also proved that MBCC can be used as a potential adsorbent for eliminating in the fixed-bed column. The saturated MBCC was also regenerated and reused consecutively for four cycles. The usage of mixture of NaOH and NaCl in recovering MBCC was better than NaCl only.