Wood-derived monolithic carbon materials have attracted increasing attention because of the unique porous structure, renewability, and easy processing. They are frequently used as a structural functional material in energy, environment, catalysis, and other applications recently. Wood-derived monolithic carbon materials still exhibit the interconnected capillary array structure of wood which is in favor of mass transfer and energy storage/conversion offering application performance and prospect. Herein, wood-derived monolithic carbon materials, from preparation to function application, are summarized. Various wood raw materials and carbonization methods are described in this work, as well as their impressive application performance in different fields. The aim is to provide an overview of the different monolithic carbon materials obtained from bulk wood which are employed for various functional applications, including energy storage/conversion, environmental conservation, solar steam generation devices, catalysis, and microwave absorption. This review will deepen the understanding of wood-derived monolithic carbon utilization and inspire new ideas in the area of designing advanced wood-based materials.
Recycling of spent lithium-ion batteries (LIBs) has attracted increasing attentions recently on account of continuous growth demand for corresponding critical metals/materials and environmental requirement of solid waste disposal. In this work, rice husk as one of the most abundant renewable fuel materials in the world was used to prepare rice husk char (RC) and applied to recycle multivalent ions in waste water from hydrometallurgical technology dispose of spent LIBs. Rice husk char with specific surface area and abundant pores was obtained via pickling and desilication process (DPRC). The structural characterization of the obtained rice husk char and its adsorption capacity for multivalent ions in recycled batteries were studied. XRD, TEM, SEM, Raman, and BET were used for the characterization of the raw and the modified samples. The results show rice husk chars after desilication has more flourishing pore structure and larger pore size about 50–60 nm. Meanwhile, after desilication, the particle size of rice husk char decreased to 31.392 μm, and the specific surface area is about 402.10 m2/g. Its nitrogen adsorption desorption curve (BET) conforms to the type IV adsorption isotherm with H3 hysteresis ring, indicating that the prepared rice husk char is a mesoporous material. And the adsorption capacity of optimized DPRC for Ni, Co, and Mn ions is 7.00 mg/g, 4.84 mg/g, and 2.67 mg/g, respectively. It also demonstrated a good fit in the Freundlich model for DPRC-600°C, and a possible adsorption mechanism is proposed. The study indicates biochar materials have great potential as an adsorbent to recover multivalent ions from spent batteries.
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