Efficient preparation of carbon nanospheres-anchored porous carbon materials and the investigation on pretreatment methods
TL;DR: In this article, a 1980 m2/g of carbon nanospheres-anchored porous carbon material (PHAC) derived from waste sawdust was prepared by a method of H3PO4 hydrothermal combined with fast activation at 450 °C within 2.8 minutes.
About: This article is published in Bioresource Technology.The article was published on 2022-01-01. It has received 3 citations till now. The article focuses on the topics: Carbon fibers & Chemical engineering.
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TL;DR: In this article , magnetic activated carbons (MACs) were prepared by one-step and two-step hydrothermal methods combined with FeSO40.7 and FeCl30.6 H2O for the removal of methylene blue from printing and dyeing wastewater.
7 citations
TL;DR: The POPC-2 has a high SSA (2852 m2 g−1) and an oxygen content of 15.73 wt%, providing more charge capacity and active sites as discussed by the authors .
2 citations
TL;DR: In this article , a structural engineering strategy (chemical exfoliation and enzyme assisted synergistic method) is proposed to prepare oxygen-containing functionalized porous carbon microbelts (OPCMs) as freestanding K metal hosts.
Abstract: Potassium metal as anode is an ideal material for the assembly of high specific energy batteries. However, safety issues caused by unrestricted dendrite growth and “dead K” generation severely limit their application. Here, based on the concept of waste recycling, a structural engineering strategy (chemical exfoliation and enzyme-assisted synergistic method) is proposed to prepare oxygen-containing functionalized porous carbon microbelts (OPCMs) as freestanding K metal hosts. The porous structure, uniformly distribution of carbon nanospheres, and the presence of oxygen-containing functional groups reduce the energy barrier of K nucleation and promote the deposition kinetics. Benefitting from these advantages of OPCMs, the OPCMs-based K composite anodes (K-OPCMs) are free of obvious dendrite growth during the plating process. Symmetric cells assembled with K-OPCMs maintain a stable overpotential of 40 mV after cycling for more than 800 h at 1 mA cm−2. In addition, the K-OPCMs//organic cathode (PTCDA) full cell exhibits excellent rate capability (96% capacity retention, 100–2000 mA g−1, which is superior to most reported potassium metal batteries) and ultralong lifespan (97.8 mA h g−1, after 1500 cycles at 2000 mA g−1). This study illustrates the effectiveness of structure-engineered and provides a guiding insight for achieving high-performance rechargeable batteries.
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TL;DR: In this article, the different roles of the three components (hemicellulose, cellulose, and lignin) in pyrolysis are investigated in depth using a thermogravimetric analyzer (TGA).
Abstract: To better understand biomass pyrolysis, the different roles of the three components (hemicellulose, cellulose, and lignin) in pyrolysis are investigated in depth using a thermogravimetric analyzer (TGA). The pyrolysis characteristics of the three components are first analyzed, and the process of biomass pyrolysis is divided into four ranges according to the temperatures specified by individual components. Second, synthesized biomass samples containing two or three of the biomass components are developed on the basis of a simplex-lattice approach. The pyrolysis of the synthesized samples indicates negligible interaction among the three components and a linear relationship occurring between the weight loss and proportion of hemicellulose (or cellulose) and residues at the specified temperature ranges. Finally, two sets of multiple linear-regression equations are established for predicting the component proportions in a biomass and the weight loss of a biomass during pyrolysis in TGA, respectively. The resul...
1,000 citations
TL;DR: In this paper, the authors presented the critical hydrothermal parameters of hydrothermal carbonization, including temperature, residence time, heating rate, reactant concentration, and aqueous quality.
Abstract: Hydrothermal carbonization (HTC) is a thermochemical conversion technique which is attractive due to its ability to transform wet biomass into energy and chemicals without predrying. The solid product, known as hydrochar, has received attention because of its ability to prepare precursors of activated carbon in wastewater pollution remediation, soil remediation applications, solid fuels, and other carbonaceous materials. Besides the generally lignocellulose biomass used as sustainable feedstock, HTC has been applied to a wide range of derived waste, including sewage sludge, algae, and municipal solid waste to solve practical problems and generate desirable carbonaceous products. This review presented the critical hydrothermal parameters of HTC, including temperature, residence time, heating rate, reactant concentration, and aqueous quality. The chemical reaction mechanisms involved in the formation of hydrochar derived from single components and representative feedstock, lignocellulose, and sludge termed as N-free and N-rich biomass, were elucidated and summarized to better understand the hydrochar formation process. Specifically, hydrochar physicochemical characteristics such as surface chemistry and structure were investigated. Current knowledge gaps, and new perspectives with corresponding recommendations were provided to further exploit the great potential of the HTC technique and more practical applications for hydrochar in the future.
707 citations
TL;DR: In this paper, N 2 adsorption, scanning electron microscopy (SEM), Boehm titration and Fourier transform infrared (FTIR) techniques were used to obtain the highest surface area (1455 m 2 /g) and total pore volume (0.88 cm 3 /g), with an impregnation ratio of 5/1.
324 citations
TL;DR: In this article, the adsorption of congo red and methylene blue dyes in aqueous solution were characterized via XRD, FTIR and SEM techniques and the dye isotherms at three temperatures were quantified.
287 citations
TL;DR: This work reports a powerful and general strategy, linker thermolysis, to construct ultrastable hierarchically porous metal-organic frameworks (HP-MOFs) with tunable pore size distribution, and provides fresh insights into the connection between linker apportionment and vacancy distribution.
Abstract: Sufficient pore size, appropriate stability, and hierarchical porosity are three prerequisites for open frameworks designed for drug delivery, enzyme immobilization, and catalysis involving large molecules. Herein, we report a powerful and general strategy, linker thermolysis, to construct ultrastable hierarchically porous metal-organic frameworks (HP-MOFs) with tunable pore size distribution. Linker instability, usually an undesirable trait of MOFs, was exploited to create mesopores by generating crystal defects throughout a microporous MOF crystal via thermolysis. The crystallinity and stability of HP-MOFs remain after thermolabile linkers are selectively removed from multivariate metal-organic frameworks (MTV-MOFs) through a decarboxylation process. A domain-based linker spatial distribution was found to be critical for creating hierarchical pores inside MTV-MOFs. Furthermore, linker thermolysis promotes the formation of ultrasmall metal oxide nanoparticles immobilized in an open framework that exhibits high catalytic activity for Lewis acid-catalyzed reactions. Most importantly, this work provides fresh insights into the connection between linker apportionment and vacancy distribution, which may shed light on probing the disordered linker apportionment in multivariate systems, a long-standing challenge in the study of MTV-MOFs.
260 citations