| Title | Single-stage production of miscanthus hydrochar at low severity conditions and application as adsorbent of copper and ammonium ions |
|---|---|
| ID_Doc | 8118 |
| Authors | Georgiou, E; Mihajlovic, M; Petrovic, J; Anastopoulos, I; Dosche, C; Pashalidis, I; Kalderis, D |
| Title | Single-stage production of miscanthus hydrochar at low severity conditions and application as adsorbent of copper and ammonium ions |
| Year | 2021 |
| Published | |
| Abstract | In the framework of bio-circular economy, miscanthus biomass was valorized through a single-stage, low severity hydrothermal carbonization process. The produced hydrochars were characterized using elemental and spectroscopic methodologies. It was determined that as the temperature increased so did the C content (47.9 and 68.9% for the samples prepared at 180 and 260 degrees C, respectively), whereas the O content decreased (from 44.2 to 25.5%, respectively). The adsorption behaviour of the hydrochars was investigated in the adsorption of Cu2+ and NH4+ and MIS-180 was determined as the optimum sample, achieving qmax values of 310 and 71 mg g-1, respectively. Isotherm and kinetic analysis indicated the higher number of O-containing functional groups of MIS-180 as the main reason for its higher adsorption capacities. Furthermore, Cu2+ adsorption followed the 2ndorder kinetic model, whereas NH4+ adsorption followed the 1st-order kinetic model, due to the different mechanisms involved, inner-sphere and outer-sphere complex formation, respectively. |
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