Adding value to gasification and co-pyrolysis chars as removal agents of Cr3+

Godinho, Delfina Maria Barbosa; Dias, Diogo; Bernardo, María; Lapa, Nuno; Fonseca, Isabel; Lopes, Helena; Pinto, Filomena

doi:10.1016/j.jhazmat.2016.09.006

Cited by 26 publications

(5 citation statements)

References 40 publications

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“…At present, traditional methods for removing Cr from wastewater mainly include electrolysis [5], chemical methods [6], ion exchange methods [7,8], membrane separation [9], catalytic reduction [10], and adsorption [11,12]. The bioavailability, reactivity, and mobility levels of pollutants can be suitably controlled by adsorption.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Deng

Jiang

et al. 2020

Materials

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Biochars were produced with magnesium chloride as an additive for the sorption of hexavalent chromium dissolved in water using five types of straw (from taro, corn, cassava, Chinese fir, and banana) and one type of shell (Camellia oleifera) as the raw materials. The removal of hexavalent chromium by the six biochars mainly occurred within 60 min and then gradually stabilized. The kinetics of the adsorption process were second order, the Langmuir model was followed, and the adsorption of Cr(VI) by the six biochars was characterized by Langmuir monolayer chemisorption on a heterogeneous surface. Banana straw biochar (BSB) had the best performance, which perhaps benefitted from its special structure and best adsorption effect on Cr(VI), and the theoretical adsorption capacity was calculated as 125.00 mg/g. For the mechanism analysis, Mg-loaded biochars were characterized before and after adsorption by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and scanning electron microscopy/energy dispersive spectroscopy (SEM-EDS). The adsorption mechanism differed from the adsorption process of conventional magnetic biochar, and biochar interactions with Cr(VI) were controlled mainly by electrostatic attraction, complexation, and functional group bonding. In summary, the six Mg-loaded biochars exhibit great potential advantages in removing Cr(VI) from wastewater and have promising potential for practical use, especially BSB, which shows super-high adsorption performance.

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Section: Introductionmentioning

confidence: 99%

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Deng

Jiang

et al. 2020

Materials

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“…The initial mass concentration gradients of ciprofloxacin are 2,4,6,8,10,12,14,16,18,20,25,30,35,40,45, 50, 60 and 70 mg/L, at room temperature, with a co-pyrolysis biochar dosage of 0.05 g. The isotherm adsorption characteristics of RG700, RG800 and RG900 were determined according to the above adsorption experimental steps. The Langmuir-Freundlich, Langmuir, Freundlich and Temkin isothermal models were used to describe the isotherm adsorption process of ciprofloxacin on co-pyrolysis biochar.…”

Section: Isotherm Adsorptionmentioning

confidence: 99%

“…Biochar with a well-developed pore structure prepared by the co-pyrolysis of biomass such as tea dregs, [5] rice husk [6] and pine sawdust [7] with sludge is used for the removal of water dyes. Biochar prepared by the co-pyrolysis of rice husk with PE/PP/PS, [8,9] rapeseed straw, and phosphate ore [10] shows strong adsorption ability for the removal of heavy metal ions in water. The co-pyrolysis biochar derived from corn straw with sawdust [11] and wheat husk with paper sludge [12] can effectively remove atrazine and 2,4-dichlorophenol.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics of Water Ciprofloxacin on Co‐Pyrolysis Biochar Derived from Rubber and Ginkgo Biloba Leaves

Zhang,

Li,

et al. 2023

ChemistrySelect

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Taking rubber and ginkgo biloba leaves as raw materials (the mass ratio is 5 : 2), this study prepared biochar by co‐pyrolysis at 700–900 °C and explored its adsorption performance on the emerging water pollutant ciprofloxacin. The pyrolysis behaviors of rubber, ginkgo biloba leaves, and their mixture were investigated using a thermogravimetric analyzer. The microstructure and physicochemical properties of the co‐pyrolysis biochar prepared in this study were probed through scanning electron microscopy (SEM), Brunauer‐Emmett‐Teller (BET) and element analysis. Meanwhile, the internal mechanism of prepared co‐pyrolysis biochar adsorbing ciprofloxacin was investigated using adsorption kinetics models and isotherm adsorption models. The results show that there is a synergistic effect between rubber and ginkgo biloba leaves during the co‐pyrolysis process. Due to the addition of ginkgo biloba leaves, the maximum mass loss rate of rubber reduces from −5.80 %/min to −4.98 %/min, the corresponding pyrolysis temperature decreases from 335.11 °C to 319.57 °C, and the calculated thermogravimetric analysis (TG) and differential thermogram (DTG) curves after mixing the two raw materials deviate from the experimental curves. As the pyrolysis temperature increases from 700 °C to 900 °C, the yields of biochars decrease from 28.62 % to 19.21 %, while the specific surface area significantly increases (337.5042 m2/g). The processes of co‐pyrolysis biochars prepared at different temperatures absorbing ciprofloxacin conform to the pseudo‐second‐order model (R2=0.9847, 0.9404 and 0.9772, respectively). The Langmuir‐Freundlich model describes the isotherm adsorption behaviors of co‐pyrolysis biochars prepared at different temperatures on ciprofloxacin excellently (R2=0.9976, 0.9995 and 0.9993). The co‐pyrolysis biochar prepared at 900 °C has the highest adsorption capacity for ciprofloxacin, 306.6 mg/g. This study provides an essential reference for the application of co‐pyrolysis biochar of low‐cost and environment‐friendly in the removal of water pollutants.

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“…Adsorption is also an alternative valorization route of gasification chars for substitution of activated carbons, since they were reported to have similar carbon content and pore structure as activated carbon [79]. As such, gasification chars may find applications in such as heavy metals adsorption or oil-spill remediation [176,177].…”

Section: Gasificationmentioning

confidence: 99%

State-of-the-Art Char Production with a Focus on Bark Feedstocks: Processes, Design, and Applications

Şen

Pereira

2021

Processes

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In recent years, there has been a surge of interest in char production from lignocellulosic biomass due to the fact of char’s interesting technological properties. Global char production in 2019 reached 53.6 million tons. Barks are among the most important and understudied lignocellulosic feedstocks that have a large potential for exploitation, given bark global production which is estimated to be as high as 400 million cubic meters per year. Chars can be produced from barks; however, in order to obtain the desired char yields and for simulation of the pyrolysis process, it is important to understand the differences between barks and woods and other lignocellulosic materials in addition to selecting a proper thermochemical method for bark-based char production. In this state-of-the-art review, after analyzing the main char production methods, barks were characterized for their chemical composition and compared with other important lignocellulosic materials. Following these steps, previous bark-based char production studies were analyzed, and different barks and process types were evaluated for the first time to guide future char production process designs based on bark feedstock. The dry and wet pyrolysis and gasification results of barks revealed that application of different particle sizes, heating rates, and solid residence times resulted in highly variable char yields between the temperature range of 220 °C and 600 °C. Bark-based char production should be primarily performed via a slow pyrolysis route, considering the superior surface properties of slow pyrolysis chars.

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Adding value to gasification and co-pyrolysis chars as removal agents of Cr3+

Cited by 26 publications

References 40 publications

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Adsorption Characteristics of Water Ciprofloxacin on Co‐Pyrolysis Biochar Derived from Rubber and Ginkgo Biloba Leaves

State-of-the-Art Char Production with a Focus on Bark Feedstocks: Processes, Design, and Applications

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