Lower-Temperature Pyrolysis to Prepare Biochar from Agricultural Wastes and Adsorption for Pb2+

Chunyan Zhang, Chunxia He, Yinhu Qiao

Abstract


Many agricultural activities generate large quantities of biomass wastes. Using these wastes to produce value-added products or energy has become very important in recent years. Heavy metals such as lead are among the most toxic chemical water pollutants from natural or anthropogenic sources. The goals of this work were to prepare three biochars from maize straw (BMS), sunflower straw (BSS), and wheat straw (BWS) under partial limited oxygen condition and to characterize their ability to adsorb Pb2+ from water. The sorption kinetics as well as the influence of solution pH and Pb2+ concentration was investigated. The three biochars had a good performance for Pb2+ adsorption. A greater adsorption efficiency was observed for BMS and BSS than for BWS. The physico-chemical properties of the biochars showed that the adsorption performance was correlated with preparation conditions, raw material types, higher total porosity, and micro-structure.

Keywords


Agricultural wastes; Biochar; Lower-temperature pyrolysis; Partial limited oxygen; Adsorption

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