| Autor: |
Alagha O; Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia., Manzar MS; Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia., Zubair M; Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia., Anil I; Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia., Mu'azu ND; Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia., Qureshi A; Environmental Engineering Department, College of Engineering A13, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia. |
| Abstrakt: |
In this study, date-palm biochar MgAl-augmented double-layered hydroxide (biochar-MgAl-LDH) nanocomposite was synthesized, characterized, and used for enhancing the removal of phosphate and nitrate pollutants from wastewater. The biochar-MgAl-LDH had higher selectivity and adsorption affinity towards phosphate compared to nitrate. The adsorption kinetics of both anions were better explained by the pseudo-first-order model with a faster removal rate to attain equilibrium in a shorter time, especially at lower initial phosphate-nitrate concentration. The maximum monolayer adsorption capacities of phosphate and nitrate by the non-linear Langmuir model were 177.97 mg/g and 28.06 mg/g, respectively. The coexistence of anions (Cl - , SO 4 2- , NO 3 - , CO 3 2- and HCO 3 - ) negligibly affected the removal of phosphate due to its stronger bond on the nano-composites, while the presence of Cl - and PO 4 3- reduced the nitrate removal attributed to the ions' participation in the active adsorption sites on the surface of biochar-MgAl-LDH. The excellent adsorptive performance is the main synergetic influence of the MgAl-LDH incorporation into the biochar. The regeneration tests confirmed that the biochar-MgAl composite can be restored effortlessly and has the prospective to be reused after several subsequent adsorption-desorption cycles. The biochar-LDH further demonstrated capabilities for higher removal of phosphate and nitrate from real wastewater. |
