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Enhanced capacity to CO2 sorption in humid conditions with a K-doped biocarbon

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Journal of Energy Chemistry 2019年第7期28卷 208-219页

作者： Nausika Querejeta FernANDo Rubiera Covadonga Pevida Instituto Nacional del Carbón

Solid sorbents with enhanced capacity and selectivity towards CO2 are crucial in the design of an efficient capture *** the possible alternatives,K2CO3-doped activated carbons have shown high CO2 capture capacity and rapid carbonation reaction *** this work,a sustainable and low-cost approach is developed with a biomass-based activated carbon or biocarbon as *** CO2 capture performance in cyclic sorption–desorption operation and the sorption kinetics have been investigated under different scenarios in a purpose-built fixed-bed *** of the H2O concentration in the flue gas,a constant relative humidity(~20%)in the K2CO3-doped biocarbon bed promoted the carbonation reaction and boosted the CO2 sorption capacity(1.92 mmol/g at 50℃ and 14 kPa partial pressure of CO2).Carbonation is slower than physical adsorption of CO2 but wise process design could tune the operation conditions and balance capture capacity and sorption kinetics.

关键词： biocarbon K2CO3 CO2 sorption Humid flue gas

Oxytetracycline Water Contamination Treated with biocarbon TiO2 and Solar Photodecomposition

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Journal of Agricultural Chemistry and Environment 2020年第4期9卷 299-313页

作者： Nilce Ortiz Izabela Rodrigues Cerqueira Lima Azevedo Marília Guerino Vieira Fernanda Maichin Lucia Nascimento Institute for Nuclear and Energy Research—IPEN S&#227 o Paulo SP Brasil

Reliable data of antibiotic use and environmental discharge as veterinary medicine are essential to help countries raise awareness of the appropriate use, control, and correct water release. The first approach is to change the regulatory framework based on consuming information, use policy, and discharge laws. The important research contribution is a novel water treatment process to treat, remove, and reduce antibiotic concentration in discharged water, mainly those used in the animal protein industry. The low particle biochar added during the titanium isopropoxide hydrolysis reduces the titanium dioxide (TiO2) agglomerates and promotes the adsorption surface process. Such improved catalyst material enhances the solar decomposition efficiency to 93% from original oxytetracycline with better correspondence with the Elovich kinetics, intraparticle diffusion, R-P isotherm, and Langmuir-Hinshelwood model.

关键词： Oxytetracycline Solar Photodecomposition biocarbon Elovich Langmuir-Hinshelwood (L-H)

The Use of Eucalyptus Activated biocarbon for Water Treatment-Adsorption Processes

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American Journal of Analytical Chemistry 2017年第8期8卷 515-522页

作者： Roberta M. Nunes Damaris Costa Nilce Ortiz Center for Environmental Chemistry Institute for Nuclear and Energy Research-IPEN S&atilde o Paulo Brazil

A biocarbon after activation process showed the removal percentage of 92% of methylene blue in solution, the equilibrium parameter—RL value was in the interval from 0 to 1, with 46% of surface coverage degree. The Freundlich constant (n) was higher than 1 as an indication of the physical adsorption process. The Radlich-Peterson calculations obtained the higher R2 value which g constant near 1, a high similarity with Langmuir model. Temkin constant B1 was a positive indication of endothermic process. All calculations provided favorable results for the use of activated biocarbon for dye removing and possible for other organic substances.

关键词： biocarbon Radlich-Peterson Eucalyptus Temkin

Walnut septum-derived hierarchical porous carbon for ultra-high-performance supercapacitors

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Rare Metals 2022年第7期41卷 2280-2291页

作者： Meng Zhou Sheng-Xue Yan Qing Wang Ming-Xiu Tan Deng-Yang Wang Zi-Qi Yu Shao-Hua Luo Ya-Hui Zhang Xin Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Hebei Key Laboratory of Dielectric and Electrolyte Functional Material Qinhuangdao 066004China Qinhuangdao Key Laboratory of Advanced Energy Storage and Conversion Technology Qinhuangdao 066004China

The conversion of biomass waste into eco-nomical and high-performance energy storage devices receives significant ***,a facile and green method to prepare porous active carbon from walnut sep-tum is applied to the electrode materials of *** effect of chemical etching reagent(KOH)on the microstructure and specific capacitance of the porous car-bon are *** modified BC-2.0,with a KOH/walnut septum mass ratio of 2∶1,exhibits large specific surface area of 1003.9 m^(2)·g^(-1)with hierarchical micro-mesoporous ***-2.0 reveals a superior specific capacitance of 457 F·g^(-1)at 1 A·g^(-1).The flexible sym-metric supercapacitor in gel electrolyte(KOH/PVA)exhi-bits considerable synergetic energy-power output *** results indicate that walnut septum is a better precursor to obtain activated carbons relative to other biomass carbon *** large mesoporosity after activation effectively boosts the electrochemical properties of ***,the walnut septum has potential to be a superior electrode material for supercapacitors.

关键词： Activation biocarbon Micro-mesoporous structure Supercapacitor High specific capacitance

Preparation of nitrogen and sulfur co-doped ultrathin graphitic carbon via annealing bagasse lignin as potential electrocatalyst towards oxygen reduction reaction in alkaline and acid media

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Journal of Energy Chemistry 2019年第7期28卷 33-42页

作者： Yixing Shen Feng Peng Yonghai Cao Jianliang Zuo Hongjuan Wang Hao Yu School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Guangzhou Key Laboratory for New Energy and Green Catalysis School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006GuangdongChina

Renewable lignin used for synthesizing materials has been proven to be highly potential in specific ***,we report a simple method to synthesize nitrogen and sulfur co-doped carbon nanosheets by using bagasse lignin,denoted as lignin-derived carbon(LC).By adjusting the ratio of nitrogen source and annealing temperature,we obtained the ultrathin graphitic lignin carbon(LC-4-1000)with abundant wrinkles with high surface area of 1208 m2g_1 and large pore volume of 1.40 cm3g_*** alkaline medium,LC-4-1000 has more positive half-wave potential and nearly current density compared to commercial Pt/C for oxygen reduction reaction(ORR).More importantly,LC-4-1000 also exhibits comparable activity and superior stability for ORR in acid medium due to its high graphitic N ratio and a direct four electron pathway for *** study develops a cost-effective and highly efficient method to prepare biocarbon catalyst for ORR in fuel cells.

关键词： Electrocatalyst biocarbon Lignin Nitrogen and sulfur co-doped carbon Oxygen reduction reaction

Lignin derived multi-doped(N, S, Cl) carbon materials as excellent electrocatalyst for oxygen reduction reaction in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2020年第5期29卷 106-114页

作者： Yixing Shen Yuhang Li Guangxing Yang Qiao Zhang Hong Liang Feng Peng School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006GuangdongChina School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640GuangdongChina

Nowadays,hierarchically macro-/meso-/microporous 3D carbon materials have been paid more attention due to their imaginative application potential in specific ***,we report a dualtemplate strategy using eutectic NaCl/ZnCl2 melt as airtight and swelling agent to obtain 3D mesoporous skeleton structured carbon from renewable *** prepared lignin-derived biocarbon material(LN-3-1)has a high specific surface area(1289 m^2 g^-1),a large pore volume(2.80 cm^3 g^-1),and a well-connected and stable ***-3-1 exhibits extremely high activity and stability in acidic medium for oxygen reduction reaction(ORR),superior to Pt/C catalyst and most non noble-metal catalysts reported in recent *** prepared carbon material was used as a cathode catalyst to assemble a H2-O2 single fuel cell,and its excellent catalytic performance has been confirmed with the maximum power density of 779 mW cm^-2,which is one of the highest power densities among non-metallic catalysts so *** functional theory(DFT)calculations indicate that the synergy of chlorine and nitrogen reconciles the intermediate adsorption energies,leading to an appropriate theoretical ORR onset *** develop a cost-effective and highly efficient method to prepare biocarbon catalyst for ORR in proton-exchange membrane fuel cells.

关键词： Electrocatalyst biocarbon Fuel cells Lignin-derived carbon Oxygen reduction reaction Chlorine doping