scholarly journals Effect of carbon surface functional groups on the synthesis of Ru/C catalysts for supercritical water gasification

2015 ◽  
Vol 5 (7) ◽  
pp. 3658-3666 ◽  
Author(s):  
Gaël Peng ◽  
Fabian Gramm ◽  
Christian Ludwig ◽  
Frédéric Vogel
Keyword(s):  
Functional Groups ◽  
Supercritical Water ◽  
Elemental Analysis ◽  
Carbon Support ◽  
Carbon Surface ◽  
Surface Functional Groups ◽  
Boehm Titration ◽  
Supercritical Water Gasification

A carbon support was treated with HNO3 to create surface functional groups (e.g. –COOH, –OH), which were then characterized by TGA, TPD, CNS elemental analysis, and Boehm titration.

scholarly journals Physicochemical Characterization of Cherry Pits-Derived Biochar

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 408
Author(s):  
Vladimír Frišták ◽  
Diana Bošanská ◽  
Martin Pipíška ◽  
Libor Ďuriška ◽  
Stephen M. Bell ◽  
...  
Keyword(s):  
Functional Groups ◽  
Material Characterization ◽  
Physicochemical Characterization ◽  
Exchange Capacity ◽  
Surface Functional Groups ◽  
X Ray ◽  
Surface Functionality ◽  
Boehm Titration ◽  
Pyrolysis Processes

Although the suitability of some biochars for contaminants’ sorption separation has been established, not all potential feedstocks have been explored and characterized. Here, we physicochemically characterized cherry pit biochar (CPB) pyrolyzed from cherry pit biomass (CP) at 500 °C, and we assessed their As and Hg sorption efficiencies in aqueous solutions in comparison to activated carbon (AC). The basic physicochemical and material characterization of the studied adsorbents was carried out using pH, electrical conductivity (EC), cation exchange capacity (CEC), concentration of surface functional groups (Boehm titration), and surface area (SA) analysis; elemental C, H, N analysis; and Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX). AsO43− anions and Hg2+ cations were selected as model contaminants used to test the sorption properties of the sorption materials. Characterization analyses confirmed a ninefold increase in SA in the case of CPB. The total C concentration increased by 26%, while decreases in the total H and N concentrations were observed. The values of carbonate and ash contents decreased by about half due to pyrolysis processes. The concentrations of surface functional groups of the analyzed biochar obtained by Boehm titration confirmed a decrease in carboxyl and lactone groups, while an increase in phenolic functional groups was observed. Changes in the morphology and surface functionality of the pyrolyzed material were confirmed by SEM–EDX and FTIR analyses. In sorption experiments, we found that the CPB showed better results in the sorption separation of Hg2+ than in the sorption separation of AsO43−. The sorption efficiency for the model cation increased in the order CP < CPB < AC and, for the model anion, it increased in the order CPB < CP < AC.

Design of Carbon Surface Functional Groups on the Viewpoint of Lubricant Layer Structure

2000 ◽  
Vol 43 (4) ◽  
pp. 802-808 ◽  
Author(s):  
Toru Yatsue ◽  
Heigo Ishihara ◽  
Hiroyuki Matsumoto ◽  
Hiroshi Tani
Keyword(s):  
Functional Groups ◽  
Layer Structure ◽  
Carbon Surface ◽  
Lubricant Layer ◽  
Surface Functional Groups

scholarly journals Research application of K2CO3 activated coal coal and processing by HNO3 from cake shoulder to process Methylene Blue color

2020 ◽  
Vol 4 (1) ◽  
pp. First
Author(s):  
Dao Minh Trung
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Functional Groups ◽  
Carbon Surface ◽  
Cellulose Content ◽  
Blue Color ◽  
Surface Functional Groups ◽  
Research Application ◽  
Grain Processing ◽  
Activated Coal

Macadamia is a tree that produces dried fruits, with each ton of macadamia seeds producing 70 - 77% of the shell. Annually, the grain processing companies in Vietnam produce thousands of tons of seeds and release tens of thousands of tons of shells. As the demand for macadamia nuts is constantly increasing in the market, more in-depth studies are needed to handle this agricultural residue. Macadamia shell has a higher surface area than other seed pods and their ash content is very low at only 0.22%, the cellulose content in the shell is about 41.2%, this shows that Macadamia shell has the potential to prepare activated carbon when burning at high temperatures. The activated carbon surface can be modified appropriately to change adsorption characteristics, forming different types of surface functional groups (oxygen functional groups, carbon surface functional groups, carbon functional groups, carbon - nitrogen, carbon - halogen) and make coal more suitable for special applications. Results of researching to prepare bio-denatured material from activated carbon K2CO3 by chemical method using HNO3 agent with optimal denaturing conditions such as concentration of 21%, denaturation time of 12 hours, degree MB adsorption reached 193.13 mg/g. The results of methylene blue adsorption adsorption tests at the optimal conditions show that at pH = 9.5 with the appropriate dose of coal is 1g/L in 120 minutes, it can be processed to reach 79.36% efficiency for water. Methylene Blue waste is 70 mg/L.

Catalytic Wet Air Oxidation of Phenol over Oxidized Activated Carbon

2013 ◽  
Vol 345 ◽  
pp. 176-179
Author(s):  
Guo Yang ◽  
Xing Yong Liu ◽  
Fu Tao Wang
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Functional Groups ◽  
Removal Rate ◽  
Carbon Surface ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Surface Functional Groups ◽  
Modified Activated Carbon ◽  
Oxidized Activated Carbon

A commercial activated carbon was oxidized with nitric acid to tailor the structure of pore and adjust the distribution of surface functional groups. The textual properties of catalysts was characterized using N2adsorption, and Boehm titration was applied to quantitative analysis of the functional groups on activated carbon surface. The catalytic activity of modified activated carbon was performed by trickle bed at specific temperature and pressure. The oxidized activated carbon displayed lower removal rate for phenol. This phenomenon was reasonably interpreted by small specific surface area and increase in oxygen-containing surface functional groups. The catalytic activity test showed that higher reaction temperature and higher oxygen partial pressure were favorable for phenol conversion.

Supercritical water gasification of food waste: Effect of parameters on hydrogen production

2020 ◽  
Vol 45 (29) ◽  
pp. 14744-14755 ◽  
Author(s):  
Wei Su ◽  
Changqing Cai ◽  
Ping Liu ◽  
Wei Lin ◽  
Baorui Liang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Food Waste ◽  
Supercritical Water ◽  
Supercritical Water Gasification

A novel eutectic solvent precursor for efficiently preparing N-doped hierarchically porous carbon nanosheets with unique surface functional groups and micro-pores towards dual-carbon lithium-ion capacitors

2021 ◽  
Author(s):  
Kaixiang Zou ◽  
Yuanfu Deng ◽  
Weijing Wu ◽  
Shiwei Zhang ◽  
Guohua Chen
Keyword(s):  
Functional Groups ◽  
Porous Carbon ◽  
High Performance ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Surface Functional Groups ◽  
Carbon Nanosheets ◽  
Hierarchically Porous ◽  
Li Ion ◽  
Unique Surface

High performance carbon-based materials are ideal electrode materials for Li-ion capacitors (LICs), but there are still many challenges such as the complicated preparation preocesses, high cost and low yield. Also,...

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