Effect Of Pyrolysis Temperature Research Articles

Green Synthesis of Pachyrhizus erosus‐Derived Carbon Aerogels for Adsorption of Oil and Organic Solvents and Investigation of Their Electrochemical Properties

AbstractIn this study, to make the most of biomass as raw material, carbon aerogel was fabricated by green synthesis and low‐cost methods with high applicability. Pachyrhizus erosus‐derived carbon aerogel (PCA) was synthesized through a simple process by hydrothermal freeze‐drying combined with pyrolysis. The effect of pyrolysis temperature on the characterization and applications of PCA was investigated at 600, 700, and 800 °C. Characterization of PCA was analyzed by modern methods: scanning electron microscope, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction analysis (XRD), energy‐dispersive X‐ray (EDX), and nitrogen adsorption–desorption isotherms. With its diverse pore structure and bulk form, PCA was investigated for applications of oil and organic solvent adsorption and energy storage. From that, PCA becomes a potential material application in adsorption and energy storage with an oil adsorption capacity 31 times its volume and a specific capacitance of up to 349.9 F/g for PCA pyrolysis at 700 °C.

Preparation of Nitrogen-Doped Activated Carbon from Palm Oil Empty Fruit Bunches for Electrodes in Electric Double-Layer Capacitance-Type Supercapacitors: Effect of Pyrolysis Temperature

Preparation of Nitrogen-Doped Activated Carbon from Palm Oil Empty Fruit Bunches for Electrodes in Electric Double-Layer Capacitance-Type Supercapacitors: Effect of Pyrolysis Temperature

Pyrolysis of Golden Snail Shells (Pomacea canaliculata L.) for Phosphorus Removal from Aqueous Solutions

Biochar derived from abundant waste biomass has emerged as an eco-friendly alternative to conventional adsorbents. In this study, biochar produced from golden snail shells through a simple pyrolysis process was applied for phosphorus adsorption. The effects of pyrolysis temperature and time on adsorption capacity were investigated. The biochar pyrolyzed at 800 °C for 90 min (B800) exhibited the best adsorption performance. Optimal adsorption conditions were determined to be a pH of 4.0 and an adsorbent dose of 1.6 g L–1. The adsorption of phosphorus onto B800 could be well described by the Langmuir model and the pseudo-first-order model, achieving a maximum adsorption capacity of 63.5 mg g–1 and a rate constant of 0.029 min–1. This study highlights the potential of biochar derived from agricultural waste as a highly efficient and environmentally friendly adsorbent for phosphorus removal. Furthermore, the adsorption mechanism, driven by the electrostatic interaction occurring prior to Ca-P precipitation, was elucidated. The phosphorus adsorbed onto biochar can potentially be recycled as a soil fertilizer.

Effect of pyrolysis temperature and time of robusta coffee husk on yield and product characteristics

Effect of pyrolysis temperature and time of robusta coffee husk on yield and product characteristics

Effect of Pyrolysis Temperature on the Properties of Biochar Derived from Melinjo Seed Shells

Effect of Pyrolysis Temperature on the Properties of Biochar Derived from Melinjo Seed Shells

Physicochemical Properties of Biochar Prepared from Guinea Corn Straw as a Function of Different Pyrolysis Temperatures

The present study examined the effect of pyrolysis temperature on the physicochemical properties of biochar produced from guinea corn straws at different temperatures (300-600℃). However, the produced biochars were designated as BCG-300, BCG-400, BCG-500 and BCG-600, respectively. The produced biochar’s were characterized by different analytical techniques. These include; the proximate and elemental analyses, morphological, crystallographic, functional groups and specific surface area analyses were investigated using elemental analyzer, scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy and Brunauer–Emmett–Teller (BET), respectively. The results indicated that. increasing pyrolysis temperature increased the content of fixed carbon (C), the C content, the total content of K, Ca, and Fe, as well as the cation exchange capacity (CEC), pH, and EC. While the yield, the content of volatile matter O and H, and the ratios of O/C and H/C decreased. Additionally, at higher pyrolysis temperature, the BET surface area and pore volume increased with increased in temperature, typically due to the increase of the micropore surface area and micropore volume. Furthermore, the data of Fourier transformation infrared showed that at higher pyrolysis temperature, the biochar aromaticity increased and decreased in polarity. Similarly, the crystalline mineral components increased with pyrolysis temperatures due to the cellulose loss, as indicated by X-ray diffraction analysis and scanning electron microscope images. Hence, pyrolysis temperature has a strong effect on biochar properties, and therefore biochars can be produced by changing pyrolysis temperature in order to meet their applications, such as carbon sequestration, greenhouse gas mitigation and as an adsorbent for organic and inorganic contaminants when applied to the environment etc.

Study on defluoridation of water by using activated carbon derived from chestnut shell as adsorbent

The present work intended to produce new cost-effective alkali-activated adsorbents from chestnut shells with the purpose of removing fluoride from water, and to explore the effect of pyrolysis temperature on fluoride decontamination at different operational and environmental parameters. The microstructure and morphological characteristics of the resulting activated carbons were thoroughly investigated using BET, FTIR, XRD and SEM. The effectiveness of the prepared adsorbent materials in treating and remediating fluorinated water was evaluated. The impacts of several factors, including the dose of the adsorbent, the initial contamination level of fluoride, and pH on the fluoride removal efficiency were investigated were investigated. In accordance with the data, the highest adsorption was found to be at a 6 pH during 5 hours of processing duration and 0.5 g/L of dosage of adsorbent. The experimental results were well-fit by the Freundlich isotherm model and the pseudo-second-order kinetic model. The highest fluoride removal efficiency was found to be 78% at adsorption medium pH 6 and initial fluoride concentration of 10mg/L by the adsorbent prepared at 800 °C. Additional research on adsorption along with rejuvenation revealed that the reduction in adsorption potential to 10% following four repetitions of operation involving regeneration, thereby showcasing the adsorbent's versatile applicability for repeated use.

Elucidation of ammonium and nitrate adsorption mechanisms by water hyacinth biochar: effects of pyrolysis temperature.

Numerous studies indicate biochar's nitrogen (N) adsorption capacity plays a crucial role in soil N retention. However, there is limited understanding on inorganic N adsorption mechanisms in biochar derived from aquatic weeds such as water hyacinth (WH). This study investigated ammonium-N (NH4+-N) and nitrate-N (NO3--N) adsorption capacities and mechanisms of WH biochar pyrolyzed at different pyrolysis temperatures of 400°C, 600°C, and 800°C (BC400, BC600, and BC800, respectively). Results showed NH4+-N adsorption was maximized (1.07-1.09mgg-1) with BC400 at initial solution pH 7.0-9.0, while NO3--N adsorption peaked (0.80mgg-1) with BC800 at initial solution pH 5.0. Both NH4+-N and NO3--N followed well the Pseudo-second-order model in adsorption kinetics (R2 = 0.990-0.997 and 0.962-0.992, respectively). The Sips model accurately described the adsorption isotherms for NH4+-N (R2 = 0.994-0.999) and NO3--N (R2 = 0.992-0.999). The calculated maximum adsorption capacity for NH4+-N and NO3--N using Sips model was 11.2-16.8mgg-1 and 0.693-4.99mgg-1, respectively. Co-existing cations and anions reduced NH4+-N and NO3--N adsorption capacity, respectively, with other ions with higher valence exhibiting higher inhibition effects (43%-97% and 44%-73%, respectively). Primary adsorption mechanism for NH4+-N included cation exchange via oxygen-containing surface functional groups in BC400 and pore filling and surface struvite precipitation in BC800. Major adsorption mechanisms for NO3--N included electrostatic interactions in BC400 and pore filling in BC800. These findings suggested that biochar derived from aquatic weeds possessed the same potential usefulness for soil N retention as biochar from other feedstocks, and that it might assist for further detailed considerations in other studies for biochar soil application.

Effect of Pyrolysis Temperature on Microwave Heating Properties of Oxidation-Cured Polycarbosilane Powder

Silicon carbide (SiC) has excellent mechanical and chemical properties and is used in a wide range of applications. It has the characteristic of rapidly heating up to several hundred degrees within one minute when irradiated with microwave radiation at 2.45 GHz. In this study, we investigated the oxidation curing process and microwave heating properties of polycarbosilane (PCS). A PCS disk-shaped green body was fabricated via uniaxial pressure molding. Silicon carbide was prepared by varying the pyrolysis temperature, and the heating characteristics of the microwaves were evaluated. The results showed that the samples pyrolyzed at 1300 °C after oxidation curing for 2 h at 180 °C rapidly heated up to 802 °C within 1 min, and the temperature remained constant for 120 min. The maximum temperature of the samples pyrolyzed at 1500 °C was relatively low, but the rate of heating was the highest. The microstructures and crystal structures of the microwaves as a function of the pyrolysis temperature were investigated.

Effect of Pyrolysis Temperature on the Carbon Sequestration Capacity of Spent Mushroom Substrate Biochar in the Presence of Mineral Iron.

The preparation of biochar typically involves the pyrolysis of waste organic biomass. Iron-rich magnetic biochar not only inherits the characteristics of high specific surface area and porous structure from biochar but also possesses significant advantages in easy separation and recovery, which has shown great application potential in various fields such as soil improvement and water resource remediation. This study aims to explore the influence of mineral iron on the carbon sequestration capability of biochar during the pyrolysis process. Experiments were conducted by using spent mushroom substrates as raw materials to prepare biochar at different temperature intervals (300 to 600 °C). The addition of exogenous iron has been found to significantly enhance the carbon retention rate (12.2-44.5%) of biochar across various pyrolysis temperatures and, notably, improves the carbon stability of biochar at 300 °C, 400 °C, and 600 °C. Through the analysis of thermogravimetric mass spectrometry (TG-MS) and X-ray photoelectron spectroscopy (XPS), we discovered that iron catalyzes the thermochemical reactions and inhibits the release of organic small molecules (C2-C5) through both physical blocking (FexOx) and chemical bonding (C=O and O-C=O). The results of Raman spectroscopy and infrared spectroscopy analyses indicate that the addition of iron significantly promotes the graphitization process of carbon and enhances the thermal stability of biochar within the temperature range of 300 to 500 °C. When exploring the retention and stability of carbon during pyrolysis, it was found that under the conditions of 600 °C and the presence of iron, the maximum carbon sequestration rate of biochar can reach 60.6%. Overall, this study highlights the critical role of iron and pyrolysis temperature in enhancing the carbon sequestration capacity of biochar.

Effect of pyrolysis temperature on the physical and chemical characteristics of pine wood biochar

Biochar is a useful bioproduct with a wide range of promising applications. The main objective of this study is to investigate the effect of pyrolysis temperatures on the physicochemical properties of biochar produced from pine wood using a slow pyrolysis methodology. Fourier transfer infrared (FTIR) spectroscopy analysis uncovered that the biochar synthesized at the different temperatures selected possessed distinct functional groups. The elemental analysis confirmed that an increase in pyrolysis temperature led to a rise in the carbon (C) concentration, whereas conversely there is a reciprocal decrease in the levels of oxygen (O) and hydrogen (H). Consequently, biochar produced at high temperatures showed low (O/C) and (H/C) fractions. Surface area (gas adsorption) studies indicated that the biochar surface area and pore volume increase at higher pyrolysis temperature. In contrast, the pore size was found to decrease at high temperatures. It was found that increased pyrolysis temperature resulted in reduced biochar yield. Biochar for use in specific applications like as an adsorbent material is ultimately influenced by the pyrolysis temperature. Therefore, it can be concluded that the results of the current study enhances the understanding on the effect of pyrolysis temperature on biochar synthesis and how different parameters can be used to tailor the material characteristics for specific applications.

Investigation in the pyrolysis of polyester coated on aluminum-based beverage: Thermodynamic properties, product and mechanism

Aluminum cans are typical solid waste. Polyester coatings not only polluted the environment, but also affected the quality of aluminum recycling. In this study, three common local polyester coatings on the surface of aluminum cans were selected as raw materials (PC-PB, PC-VY and PC-SG). Thermogravimetric analysis, elemental analysis, Fourier transform infrared spectrometer and pyrolysis gas chromatography/mass spectrometry (PY-GC/MS) were used to study the pyrolysis behavior and pyrolysis products of the polymer components coated on the aluminum cans. TG analysis showed that pyrolysis of the coatings mainly occurred at 250–540 °C, with a weight loss of about 25 % for the polyester coating PC-PB and PC-VG, and a lower weight loss of 15 % for polyester coating PC-SY. The effect of pyrolysis temperature on the pyrolysis products of polyester coatings was investigated using PY-GC/MS. The results showed that the main products of pyrolysis included four major groups: oxygenated compounds, aromatic compounds, nitrogenous compounds and aliphatic hydrocarbons. At 600 °C, the aromatic compounds, oxide-containing reached 57–67 % and 20–27 %, respectively. The main pyrolysis products include neopentyl glycol, phthalic anhydride, toluene, styrene and so on. The high content of aromatic compounds in the product can be used as chemical raw materials as well as alternative fuels. In addition, the pyrolysis principles of the three main components of polyester coatings (polyester resins, amino resins, and styrene-acrylic resins) were postulated.

Performance and mechanism of the biochar-supported Ni0/Co0/MnO composite catalyst for peroxymonosulfate activation to degrade iopamidol

A biochar-supported Ni0/Co0/MnO composite catalyst was prepared from the cathode material (CM) of spent ternary 523 lithium-ion batteries (LIBs) and buckwheat hulls. The effect of pyrolysis temperature (x) and different loading ratios (y) of xBCyCM on the activation of peroxymonosulfate (PMS) was investigated. The results showed that the loading of Ni0/Co0/MnO on the biochar (BC) enhanced the IPM degradation and effectively reduced metal ions’ leaching. The 850BC10CM/PMS system degraded iopamidol (IPM) within the wide pH range of 5.0–10.0. The pseudo-first reaction rate constant kobs was 0.0944 min−1 during 25 min under optimal conditions (catalyst dose of 0.1 g·L−1, 0.5 mM of PMS, and an initial pH value of 10.0), while the leaching concentrations of Ni, Co, and Mn were 0.089, 0.035, and 0.067 mg·L−1, respectively. Furthermore, the 850BC10CM degraded IPM by radicals (·OH, SO4•−, and ·O2-) and non-radical pathways (1O2 and an electron transfer). As the pH value increased from 7.0 to 10.0, the fluorescence analysis and quenching experiments revealed a decrease in the effects of SO4•− and ·OH, while the effect of 1O2 was enhanced. The 850BC10CM could still achieve a removal rate of 86.6 % for IPM after four cycles. Based on the liquid chromatography-mass spectrometry (LC-MS) results of degradation intermediates, five possible degradation pathways were proposed. The 850BC10CM inhibited the formation of the iodoform CHI3. In short, the 850BC10CM, which was prepared by using a green, sustainable development of waste utilization, exhibited a safe and effective performance for the removal of emerging IPM pollutants.

Effects of pyrolysis temperatures on the structural properties of straw biochar and its adsorption of tris-(1-chloro-2-propyl) phosphate

To investigate the effect of pyrolysis temperature on the adsorption behavior of the emerging organic pollutant tris-(1-chloro-2-propyl) phosphate (TCIPP) on biochar, corn stover was used as raw materials to prepare biochars at different pyrolysis temperatures (250, 350, 500, 700 °C) through limited oxygen carbonization. Elemental analysis, Boehm titration, FTIR, XPS, and other analytical methods were used to reveal the effect of pyrolysis temperature on the physicochemical properties of biochar and its mechanism of TCIPP adsorption. The results showed that the pyrolysis temperature had a significant impact on the physicochemical properties of biochar. As the pyrolysis temperature increases, the specific surface area of biochar rises from 3.083 m2/g to 435.573 m2/g, the pH value increases from 6.60 to 10.66, the mass percentage of C increases from 63.10 to 80.58%, and the mass percentage of O decreases from 26.42 to 9.20%. Additionally, the hydrophobicity and aromaticity of biochar also increase with rising pyrolysis temperature, while its polarity decreases. Boehm titration, FTIR, and XPS analysis showed that the total amount of functional groups on the surface of biochar decreased relatively with increasing temperature. Functional groups such as -OH, C = C/C = O, and C-O-C participated in the adsorption of TCIPP on biochar, and ester groups were produced after adsorption. The adsorption process of TCIPP on biochar fits best with the pseudo-second-order equation, indicating that the adsorption process is mainly chemical adsorption, and the main rate-controlling stage is intraparticle diffusion. The isothermal adsorption results were more in line with the Temkin model, indicating that the adsorption process of TCIPP on biochar was mainly surface adsorption. As the pyrolysis temperature increases, the maximum adsorption capacity of biochar increases from 0.8837 mg/g to 2.2574 mg/g. The adsorption process of TCIPP on biochar mainly included pore filling, hydrogen bonding, P-π interaction, hydrophobic interaction, and electrostatic attraction. Among them, pore filling, P-π interaction, and hydrophobic interaction were significantly enhanced with increasing temperature, while hydrogen bonding was relatively weakened. This study will provide a theoretical basis and technical support for the removal of TCIPP from water using biochar adsorption.

Sugarcane straw biochar: effects of pyrolysis temperature on barite dissolution and Ba availability under flooded conditions

AbstractReductive dissolution of barium (Ba) sulfate in wetland soils may increase Ba bioavailability in the environment, yet no information is available regarding Ba remediation using biochar. This study investigated the effectiveness of sugarcane (Saccharum officinarum) straw biochar pyrolyzed at 350 °C (BC350), 550 °C (BC550), and 750 °C (BC750) in inhibiting barite dissolution and, consequently, Ba availability in a soil artificially spiked with barite and flooded for 365 days. Increasing pyrolysis temperature alters the carbon structure, and increases dehydration and depolymerization, resulting in more stable biochar that releases less DOC (8.6-fold decrease from BC350 to BC750). Additionally, high-temperature biochar (BC750) had 1.7 times higher carbon (C) content, 2.4 times higher ash content, and a 13.1 times greater specific surface area (SSA) than low-temperature biochar (BC350). Amending soil with BC750 increased pH but did not promote reducing conditions, and thus did not promote barite dissolution. Conversely, greater DOC in low-temperature biochar, particularly BC350, favored reducing conditions and increased barite dissolution by 23%, with BC550 also showing an 18% increase. This enhancement led to a greater pool of Ba sorbed into more labile exchangeable sites. In summary, pyrolysis temperature affects biochar attributes, which in turn influences the soil geochemical environment and Ba speciation. Low-temperature biochar (BC350) shows potential as an amendment to increase the bioavailable Ba pool in assisted remediation programs, such as biochar-assisted phytoremediation. Graphical Abstract

Elimination of microplastic from soil by pyrolysis and potential hazard analysis: Effects of pyrolysis temperature and holding time

AbstractEfficient and harmless treatment of microplastics in soil is the current focus of microplastic pollution management. In this study, the pyrolysis effect of soil microplastics at different temperatures and holding times was analyzed. The results showed that temperature and holding time significantly affected the morphology and compositional structure of soil. Pure microplastics and product adhesion after pyrolysis at low temperature (400°C) were not easy to remove. Interestingly, compared with pure polyethylene (PE), direct pyrolysis of microplastics in soil could obtain better results, and the content of organic matter and polycyclic aromatic hydrocarbons (PAH) could be significantly reduced. However, the pyrolysis performance was very unsatisfactory even if the action time was prolonged at 400°C. Prolonged high‐temperature treatment accelerated the fragmentation of the alkane main chain of PE, thus generating more PAH, and the temperature was not high enough (400°C) for further effective degradation of PAH into carbon dioxide and water. Therefore, higher temperature and longer holding time need to be selected to ensure the pyrolysis performance. This study revealed the role and mechanism of pyrolysis in soil microplastic mixed systems, aiming to provide a basis for the treatment of microplastics in terrestrial ecosystems.

Influence of pyrolysis temperature on biochar properties: Applications as a reinforcing filler in sbr and epdm elastomeric compounds

This study investigates the effect of pyrolysis temperature on the properties of biochar derived from Pinus spp. wood waste and its application as a reinforcing filler in styrene-butadiene rubber (SBR) and ethylene-propylene-diene monomer (EPDM) elastomeric compounds. Biochar was produced at 400°C and 900°C and its effects on the mechanical properties of the elastomers were analyzed. The results indicate that biochar produced at 900°C has higher fixed carbon content and lower volatile matter, resulting in improved mechanical properties such as tensile strength and elongation at break compared to biochar produced at 400°C. Despite a lower specific surface area, the irregular surface structure of biochar enhances its interaction with elastomers, providing a semi-reinforcement. This study highlights the potential of high-temperature biochar as a sustainable alternative to conventional fillers such as carbon black, contributing to the development of environmentally friendly materials from biomass waste. The results support further exploration of the role of biochar in elastomer applications, highlighting its environmental and mechanical benefits.

The Effect of Pyrolysis Temperature and Raw Materials Mass Comparison on the Characteristics of Briquettes from a Mixture of Rice Husk (Oryza sativa L.) and Jengkol Peel (Pithecellobium jiringa) Using Starch Adhesives

The Effect of Pyrolysis Temperature and Raw Materials Mass Comparison on the Characteristics of Briquettes from a Mixture of Rice Husk (Oryza sativa L.) and Jengkol Peel (Pithecellobium jiringa) Using Starch Adhesives

Effects of pyrolysis temperature on the photooxidation of water-soluble fraction of wheat straw biochar based on 21 ​T FT-ICR mass spectrometry

Biochar, formed through the pyrolysis or burning of organic wastes, has a complex chemical composition influenced by feedstock, pyrolysis temperature, and reaction conditions. Water-soluble, dissolved black carbon species released from biochar comprise one of the most photoreactive organic matter fractions. Photodegradation of these water-soluble species from wheat straw biochar, produced at different pyrolysis temperatures in laboratory microcosms, resulted in noticeable compositional differences. This study characterized water-soluble transformation products formed through the photodegradation of wheat straw biochar pyrolyzed at 300, 400, 500, or 600°C by electrospray ionization 21 ​T Fourier transform ion cyclotron resonance mass spectrometry (21T FT-ICR MS). We also evaluated global trends in the toxicity of these water-soluble fractions using MicroTox™ to assess the impacts of pyrolysis temperature. Additionally, we examined biochar surface morphology after photodegradation and observed minimal change after irradiation for 48 ​h, though the total yield of water-soluble biochar species varied with pyrolysis temperature. Trends in toxicity observed from MicroTox® analysis reveal that water-soluble photoproducts from biochar produced at 300°C and 900°C are nearly three times as toxic compared to dark controls. The ultrahigh resolving power of 21T FT-ICR MS allows for the separation of tens of thousands of highly oxidized, low-molecular-weight (<1 ​kDa) species, showing that photoproducts span a wider range of H/C and O/C ratios compared to their dark analogs. This study highlights the impacts of photodegradation on the molecular composition of water-soluble biochar species and underscores the influence of pyrolysis temperature on the quantity and composition of dissolved organic species.

Effect of pyrolysis temperature on migration characteristics of heavy metals during biomass pyrolysis

In this study, the distribution, morphology, and migration characteristics of heavy metals in the products obtained at different pyrolysis temperatures were studied. With an increase in the pyrolysis temperature, the heavy metals were more inclined to volatilize into bio-oil and syngas, and the volatilization ratio was Zn > Pb > Cr > Fe > Ni > Mn > Cu. At pyrolysis temperatures below 400 °C, heavy metals were transformed from the migratory states (F1, F2, F3) to the residual state (F4). When the pyrolysis temperature exceeded 500 °C, heavy metals in migration states (F1, F2, F3) migrated to the bio-oil and syngas. The residual states (F4) of Fe, Cu, Ni, and Mn were stable. Although Zn and Pb in the residual state (F4) volatilized at high temperatures, the volatilization ratio was lower than that in the migratory state (F1, F2, and F3). At a pyrolysis temperature of 900 °C, the potential risk factor (RI) of heavy metals decreased from 448.67 to 5.21, significantly reducing the environmental risk.