BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Ruihan Dong,Ziyue Tang,Yang Yang,Yingquan Chen,Xianhua Wang,Wei Cheng,Haiping Yang,Hanping Chen
The thermodynamics and kinetics effects of activators on the simultaneous activation pyrolysis of microalgae remain unclear. This study addresses this gap by investigating the effects of activators (KOH, KHCO 3 , CH 3 COOK, K 2 CO 3 ) on Spirulina platensis (SP) pyrolysis using thermogravimetric-Fourier transform infrared spectrometer (TG-FTIR) and isoconversion methods. The results showed that all activators reduced the initial decomposition temperature of SP, leading to the earlier release of volatile pyrolysis products. Kinetics analysis further revealed that the addition of activators lowered the apparent activation energy ( E α ) in the initial pyrolysis stage of SP. However, as the devolatilization process transitioned to the charring stage, the E α gradually increased, surpassing that of SP pyrolyzed alone. Thermodynamic analysis indicated that the carbonization process of microalgae in the presence of activators required higher energy absorption. These findings reveal the mechanisms of activators in microalgae pyrolysis and provide insights into biochar production.
研究领域:
能源与环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Haixia Li,Hai Zhu,Junqiang Qiu,Danning Zheng,Lifang Gao,dan zhou,Dan Xu
Overuse of antibiotics cause environmental pollution, and activated carbon adsorption was an effective way to remove antibiotics from polluted water. Herein, a cost-effective biomass carbon adsorbent for adsorption of chloramphenicol (CHL) was prepared from pomelo peel using KHCO3 activator. The activated carbon boasted a significant specific surface area (SBET) of 1608 m2·g-1 with a maximum adsorption capacity (Qmax) for CHL reaching 549.5 mg·g-1. The effect of adsorption behavior on adsorption capacity was studied. The adsorption process followed the pseudo-second-order kinetic and Langmuir model. Combined with FT-IR and XPS methods, the adsorption action included both physical adsorption and chemical adsorption. The rate-limiting step was diffusion through boundary layer. The adsorption mechanism mainly included processes pore filling, functional group binding, hydrogen bond and π-π interaction. Thermodynamic parameters demonstrated the spontaneous and exothermic properties. This work demonstrated the rational application of waste biomass carbon for efficient adsorption of antibiotics, which can provide a new help for antibiotic removal from polluted water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xianjie Wang,Long Yan,Yufei Wang,Shuaige Shi,Jian Li,Xiaoyong Fan
While phenolic porous carbons (PPCs) are commonly synthesized from single phenols, the impact of mixed phenols and ammonia on pore structure formation has yet to be fully elucidated. In this study, phenolic and ammonia components from semi-coking wastewater were used to prepare high-performance porous carbon, activated by sodium-based agents. Response surface methodology (RSM) identified optimal conditions—Na 2 CO 3 -to-resin ratio of 2.13:1, carbonization temperature of 784 °C, and activation time of 1.52 h—yielding an iodine adsorption capacity of 1046.36 mg/g. XPS analysis showed that Na 2 CO 3 activation resulted in higher retention of nitrogen, oxygen, and sulfur compared to KOH activation. This is attributed to the gentler etching effect of Na 2 CO 3 , which facilitated the formation of larger mesopores and macropores. Thermal and kinetic analysis revealed lower activation energies for Na 2 CO 3 -activated resins, especially when mixed phenols and ammonia were used as precursors. SEM and BET analysis confirmed the presence of a hierarchical pore structure. Additionally, ammonia was found to enhance pore formation, resulting in smoother and more uniform pores. These findings demonstrate the feasibility of using semi-coking wastewater as a precursor for producing sustainable porous carbon materials, offering potential applications in both environmental remediation and energy storage.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2022
·Vol. 29
·期 5
·1639-1648
·
IF 2.523
Long Shi-Jia,Si Chang-Dai
Shaddock peel-derived nitrogen doped honeycomb carbon (NHPC) has been prepared by a facile integrated gas expansion, activation and nitrogen doping strategy using urea and potassium carbonate (K 2 CO 3 ) as the mixed activating agents. The thermal decomposition of urea to generate ammonia plays a dual role of a nitrogen source and gas expanding agent, while the K 2 CO 3 plays a pore-creating medium. The NHPC exhibits honeycomb-like microstructure feature and possesses a large specific surface area (1438.5 m 2 g −1 ), high nitrogen doping (6.23 wt%) and well-developed mesopores. Consequently, the NHPC used as electrode for supercapacitor exhibits high specific capacitance of 225 F g −1 at 0.25 A g −1 and good rate capability. In addition, the symmetric supercapacitor fabricated with NHPC material in 1 M K 2 SO 4 aqueous electrolyte delivers high energy density of 18 W h kg −1 operated in the wide voltage of 2.0 V and superior cyclability of 97.8% capacity retention after 30,000 cycles.
研究领域:
材料科学
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能源存储
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Ramzi Nasser,Jian Tiantian,Ji-Ming Song
For the structure and morphology of supercapacitor (SC) electrode materials, activation agent and processing technology are two important factors. Herein, we have developed an activated carbon material with high electrochemical performance obtained from olive husk, which is pre-treated by hydrothermal route followed activation treatment by dual activators. The effect of activation agents and heteroatom doping (N, S) on the structure and electrochemical performance of the obtained materials are deeply investigated. Optimized activation temperature at 700 °C was applied to create hierarchical porous carbon structure. The Olive husk-derived Activated Carbon with KOH/NaOH (OACKNa) has a specific surface area of 2900 m 2 ·g −1 , exhibits outstanding specific capacitance of 549 F·g −1 at 1 A·g −1 with high capacitance retention of 79.5% when the current density reaches up 30 A·g −1 . Furthermore, OACKNa based symmetric SC device displays marvelous cyclic stability with rate capability of 93.2% after 10,000 cycles at 10 A·g −1 . Interestingly, OACKNa device delivers high specific energy of 38.8 Wh·kg −1 even at ultrahigh specific power of 650 W·kg −1 at 1 A·g −1 . Therefore, the obtained OACKNa with low-cost synthesis combined with the attractive electrochemical performances is a promising electrode material for supercapacitors .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Ke Liang,Yanli Chen,Shengxu Wang,Dan Wang,Wenchang Wang,Shuyong Jia,Naotoshi Mitsuzakic,Zhidong Chen
Low-cost and high-performance porous carbon electrode materials are the key to supercapacitors . Here, we reported the preparation of porous carbon materials by high-temperature carbonization coupled with chemical activators (H 3 PO 4 , ZnCl 2 , KOH) using peanut shell waste. The as-synthesized porous carbon with KOH as the chemical activator (KOH-AC) has the best ideal electric double-layer capacitance performance, outperforming other activator-treated porous carbon. In the three-electrode system, the prepared KOH-AC electrode material showed an ultra-high specific capacitance of 575.7 F g −1 at a current density of 0.5 A g −1 , good rate characteristics and excellent electrochemical stability (106.5 % initial capacitance after 10,000 cycles), which exceeded that of most biomass carbon-based materials. In the two-electrode system with 6 M KOH as electrolyte, the symmetrical supercapacitor based on KOH-AC showed a high specific capacitance of 390.9 F g −1 at 0.5 A g −1 current density in the voltage rang of 0–1.3 V, with the maximum energy density of 22.2 Wh kg −1 and power density of 319.97 W kg −1 and excellent cycle stability (93.8 % after 10,000 cycles). In addition, it is also studied that all-solid-state flexible symmetric supercapacitor in PVA/KOH electrolyte shows a high specific capacitance of 432.7 F g −1 at 0.5 A g −1 current density and can provide energy density of 18.2 Wh kg −1 and power density of 275.3 W kg −1 . In summary, this work synthesized high-performance porous carbon materials from renewable and sustainable biological wastes, which provided a feasible method for the application of biomass carbon in energy storage.
研究领域:
能源材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Jiaming Zhang,Chao Yu,Longqian Xu,Zhenyu Zhao,Deli Wu
Electro-enhanced metal-free boron/peroxymonosulfate (B/PMS) system has demonstrated potential for efficient metal-organic complexes degradation in an eco-friendly way. However, the efficiency and durability of the boron activator are limited by associated passivation effect. Additionally, the lack of suitable methods utilizing in-situ recovery of metal ions liberated from decomplexation causes huge resource waste. In this study, B/PMS coupled with a customized flow electrolysis membrane (FEM) system is proposed to address above challenges with Ni-EDTA used as the model contaminant. Electrolysis is confirmed to remarkably promote the activation performance of boron towards PMS to efficiently generate • OH which dominated Ni-EDTA decomplexation in the anode chamber. It is revealed that the acidification near the anode electrode improves the stability of boron by inhibiting passivation layer growth. Under optimal parameters (10 mM PMS, 0.5 g/L boron, initial pH = 2.3, current density = 68.87 A/m 2 ), 91.8% of Ni-EDTA could be degraded in 40 min, with a k obs of 6.25 × 10 −2 min −1 . As the decomplexation proceeds, nickel ions are recovered in the cathode chamber with little interference from the concentration of co-existing cations. These findings provide a promising and sustainable strategy for simultaneous metal-organic complexes removal and metal resources recovery.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Qia Zhang,Ling Kang,JianXiong Zou,Chun Huang,Zhiwei Gong,Jian Zhang
Sustainable and low-cost cellulose-based metallisation is the prerequisite for wearable and disposable electronics fabrication. In this paper, to realize the simplified, low-cost and high efficient metallisation, a new method had been proposed without both the noble metal activators and the corrosive chemicals. The modified electroless plating processes had been employed in activation and deposition procedure. The nickel ions were first physiadsorbed on the cellulose paper (CP) fibers and then reduced into clusters by reducing agent which can act as the seeds to initiate the electroless plating process. The gold galvanic displacement was conducted further to modify the nickel surface. Via these processes, the cellulose paper was metallised with Ni-P and Au/Ni-P successfully. The morphological and microstructural properties of the resulted Ni-P/CP and Au/Ni-P/CP hybrids were evaluated. The Ni-P/CP composites had a low surface resistance below 0.5 Ω sq -1 while the Au/Ni-P/CP composites are below 0.1 Ω sq -1 . The relationship between the mechanical and electrical properties with the plating parameters is discussed. The results indicated that Au/Ni-P/CP had good electrical conductivity and mechanical flexibility. Finally, the application demonstration for supercapacitor with the modified metallisation method was exhibited. This work offers a facile and non-toxic path to develop high-performance metallisation for functional cellulose-based materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Leyi Wang,Wenbin Jian,Zhu Jiang,Bingchi Wu,Xihong Zu,Gaixiu Yang,Wenli Zhang,Xueqing Qiu
Zinc-ion hybrid supercapacitors is a new type of electrochemical energy storage device that could realize high power density and high energy density . However, porous carbon cathode has a high cost of production due to the expensive precursors and excessive consumption of activation agents. Here, a hierarchical porous carbon was prepared by one-step carbonization of lignocellulose-based hydrogels containing alkaline activation agent. This strategy enables the activation agent to be uniformly dispersed in the lignocellulose precursor, which effectively utilizes the activation agent and thus reduces the amount of the activation agent (w(KOH)/w(precursor) <1). Moreover, the porous carbon could partially retain the macroporous and mesoporous structures formed in the lignocellulose-based hydrogel. The obtained porous carbons feature abundant mesopores (average pore sizes of ∼2.0 nm and mesopore ratio of 15.0 % – 79.8 %) and high specific surface areas (1358–1819 m 2 g −1 ). The zinc-ion hybrid supercapacitors with an obtained porous carbon cathode displayed a specific capacitance of 292.4 F g −1 , high rate capability, and long cycle stability (95.4 % capacitance retention after 12,000 cycles at 2 A g −1 ). In addition, we found that the pores larger than 0.65 nm could improve the storage efficiency of zinc ions.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Bin Zeng,Zhi Zhang,Shuo Yang,Liwu Mo,Fei Jin
Steel slag (SS) is a byproduct discharged from steel-making industry with less than 25% utilization rate in China. The low utilisation rate of SS is associated with its low hydration activity in cement and concrete. In this study, four different alkanolamines (TEA, TIPA, EDIPA and DEIPA) were used to activate SS to improve its cementitious properties and metal binding performance, and hence its capacity on treating heavy metal-contaminated soils containing Cd, Cu, Ni, Pb and Zn. Compared with the reference SS without activators, concentrations of leached Cd, Cu, Ni, Pb, and Zn have reduced by 87.2%, 78.8%, 62.4%, 73.6% and 64.5% by using 0.1% TIPA-activated SS after 28 days, and they were all below their respective regulatory limits by Standard for Pollution Control on the Hazardous Waste Landfill (GB 18598–2019) in China, and the unconfined compressive strength (UCS) of the treated soil at 28 days was enhanced by 237.7% using 0.1% TIPA-activated SS. To elucidate the activation mechanism, the hydration process of SS was thoroughly followed via isothermal calorimetry (IC) and conductivity analysis, and the nature of hydration products was studied by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). It was concluded that alkanolamines facilitated the dissolution of minerals in SS and formation of hydration products (e.g., C-S-H, C-A-H, C-F-H and Mc), and hence significantly enhanced the microstructural development and engineering properties of SS. This work demonstrated a promising way of upcycling SS as an effective and sustainable S/S agent for handling complex heavy metal contaminated soil, with the potential of enhancing the SS utilization significantly.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1118
·
IF 3.9
Yanling Wu,Qinggao Hou,Fangzhou Li,Yuanhua Sang,Mengyang Hao,Xi Tang,Fangyuan Qiu,Haijun Zhang
Biomass-derived porous carbon has gained significant attention as a cost-effective and sustainable material in non-noble metal carbon-based electrocatalysts for the oxygen reduction reaction (ORR). However, during the preparation of transition metal catalysts based on biomass-derived porous carbon, the agglomeration of transition metal atoms often occurs, leading to a notable decline in catalytic activity. In this study, we present a straightforward synthetic approach for the preparation of nitrogen-enriched soybean-derived porous carbon (Co@SP-C-a) as an electrocatalyst for the ORR. To achieve this, we employed a two-step method. In the first step, a chemical activator (KCl) was utilized to enhance the porosity of the self-doped nitrogen biomass carbon material. In the second step, a constant pressure drop funnel technique was employed to uniformly disperse bimetal cobalt/zinc-based zeolitic imidazolium frameworks (ZIF-L and ZIF-67) containing different metal ions (Zn2+and Co2+) into the activated biomass carbon material. Subsequent high-temperature calcination of the ZIF-L and ZIF-67@SP-C-a composite precursor yielded the Co@SP-C-a catalyst. The obtained catalyst exhibited remarkable ORR activity in an alkaline solution (Eonset= 0.89 V, E1/2= 0.83 V, JL= −6.13 mA·cm−2) and exceptional long-term stability. This study presents an effective strategy to prevent the agglomeration of metal nanoparticles when integrating them with biomass-based carbon materials, thus leading to enhanced catalytic performance.Keywords:transition metal atoms;biomass-derived porous carbon;chemical activator;oxygen reduction reaction
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Xianhang Jin,Enze Ren,Min Zheng,Xiurong He,Yun Yang
A CO2 phase change absorbent (CPCA) is of interest because it has the potential to reduce energy consumption for CO2 capture. Controllable phase separation behavior was expected in the development and application of a CPCA. In this study, the effects of CO2 loading under different activators and physical solvents on the phase separation behavior of an activated methyldiethanolamine (MDEA)-based CPCA were investigated. By adjustment of the CO2 loading, controllable phase separation behavior was achieved and the absorbent comprising an activator with more −NH– groups and a physical solvent with low ET(30) was favored to exhibit phase separation. Of special interest was that, with the increasing of CO2 loading, phase behaviors, from the liquid phase to solid–liquid phase and then to the liquid phase, were observed for CPCA comprising MDEA/piperazine (PZ)/N-methyl-2-pyrrolidone (NMP), which was different from all of the other known CPCAs. The solid compound was identified as PZ carbamate by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and elemental analysis, and the liquid-phase samples were detected by 13C nuclear magnetic resonance (NMR). The phase change mechanism of this special phenomenon was proposed.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）