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A porous sludge-derived char was prepared by a new one-step pyrolytic process with citric acid–ZnCl2 mixed fabricating-pore agents. The sludge-derived char was confirmed to be a hierarchically porous hybrid adsorbent containing-elemental carbon, -highly carbonized organic species and -inorganic ash with a great surface area of 792.4m2g−1. It was used as a carbon-based hybrid adsorbent for four benzene...
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