Production of carbon-based sorbents as an alternative method for utilization of lignin containing waste
Abstract
The paper proposes a method for obtaining carbon sorbents from lignin-containing waste by carbonization of lignin-containing raw materials followed by vapor activation. The carbonization step is carried out at a temperature of 700°C using a bench pyrolysis unit. The obtained carbon material is activated with water vapor at a temperature of 970°C for various durations, and the optimal activation time is found to be 60 min, which provides a high sorption activity of the product. The results of studying sorption activity with respect to iodine of the obtained sorbents have shown that the samples are characterized by high values of sorption activity (maximum sorption activity with respect to iodine is ~82%), which is competitive with the known industrial analogs obtained from wood raw materials. Thus, the proposed procedure can be considered as an alternative to the waste incineration and has proved to be a promising way for disposal of lignin-containing waste with simultaneous production of effective sorbents that can be further used for treatment of contaminated liquid media from pollutants.
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