Details

Autor(en) / Beteiligte

• Ren, Zhijun
• Jia, Biao
• Zhang, Guangming
• Fu, Xiaolin
• Wang, Zhanxin
• Wang, Pengfei
• Lv, Longyi

Titel

Study on adsorption of ammonia nitrogen by iron-loaded activated carbon from low temperature wastewater

Ist Teil von

• Chemosphere (Oxford), 2021-01, Vol.262, p.127895-127895, Article 127895

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In order to improve the adsorption efficiency of ammonia nitrogen in low temperature wastewater, the modified activated carbon (Fe-AC) was prepared by impregnation-calcination modification of Fe(NO3)3. The characterization results indicated that the total pore volume, specific surface area and the point of zero charge of activated carbon increased after modification. A better adsorption effect was achieved under neutral condition than under alkaline or acidic condition. The effect of Ca2+ on competitive adsorption of NH4+ was greater than that of Na+ when both cations were present. Pseudo-first-order kinetic model was confirmed to be consistent with Fe-AC adsorption kinetic data, and Langmuir model was consistent with adsorption isotherm data. The adsorption thermodynamics demonstrated that the ammonia nitrogen adsorption process by Fe-AC was spontaneous and low-temperature was helpful to improve the adsorption capacity. The mechanism of adsorption of ammonia nitrogen by Fe-AC was the comprehensive effect of physical adsorption and chemical adsorption, which was the essential reason for improving the adsorption efficiency of ammonia nitrogen by Fe-AC at a low temperature. This research offered a new way for the modification of activated carbon and a new method for the removal of ammonia nitrogen at a low temperature. [Display omitted] •The surface properties of activated carbon were ameliorated by iron modification.•The adsorption efficiency of ammonia nitrogen by Fe-AC was significantly improved.•Pseudo-first-order kinetic model could well fit the Fe-AC adsorption kinetic data.•Langmuir model was in good agreement with the Fe-AC adsorption isotherm data.•Absorption mechanism of Fe-AC was the synthesis of many physicochemical processes.