A facile pyrolysis synthesis of biochar/ZnO passivator: immobilization behavior and mechanisms for Cu (II) in soil

Wang, Ying; Wang, Luxing; Deng, Xiaoyan; Gao, Hongtao

doi:10.1007/s11356-019-06888-z

Cited by 21 publications

(4 citation statements)

References 40 publications

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“…4b depicts the effect of pyrolysis temperature ranging from 400 to 800 o C on MB adsorption capacity when the mass ratio of molten salt and rice husks is maintined at 1. The obtained results show that the adsorption capacity reaches the maximum value when the ZnO/AC is prepared at 800 o C. Previous works [40][41][42] have shown that the adsorption capacity of absorbents is dependent on the sample porosity, which is related to fabrication conditions such as pyrolysis temperature, pyrolysis time, carbonization source or the mass ratio of molten salt and precursor. Based on the survey results, we selected the RH1 sample for investigatigation of the influence of subsequent parameters (including pH, shaking time, initial concentration MB) on the adsorption capacity.…”

Section: Effect Of the Synthesis Conditionsmentioning

confidence: 81%

Enhancement of Methylene Blue Adsorption from ZnO/Activated Carbon Nanocompossites Prepared by Pyrolysis of Molten ZnCl2 with Rice Husks

Luyen

2023

MaP

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In this work, we synthesized a facile step pyrolysis of ZnO/activated carbon nanocomposites by using molten ZnCl2 and rice husks in oxygen-limited environment. The mass ratio of molten ZnCl2 and rice husks was chosen from 0 to 5 wt.%, the pyrolysis temperature range from 400 to 800 oC. When the mass ratio of molten ZnCl2 and rice husks was equal to 1.0 and the pyrolysis temperature was at 800 oC, the size of ZnO nanoparticles in diameter was found to be of 10-20 nm. The ZnO/activated carbon nanocomposites exhibited a porous structure with the BET surface area, average pore diameter and pore volume of 643.9 m2/g, 4,76 nm and 0.255 cm3/g, respectively. To investigate the adsorption behavior of methylene blue, batch experiments were performed on all samples. The ZnO/activated carbon sample manufactured at a mass ratio of 1.0 and a pyrolysis temperature of 800 oC has the best methylene blue adsorption capability. The Langmuir isotherm was used to calculate the maximum adsorption capacity of methylene blue, which was 814.9 mg/g. Based on the obtained results, one can suggest that ZnO/activated carbon nanocomposites prepared by the facile pyrolysis route from molten ZnCl2 and rice husks possessing eco-friendly behaviour and low productioncost can be used as a potential adsorbent for wastewater treatment.

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Section: Effect Of the Synthesis Conditionsmentioning

confidence: 81%

Enhancement of Methylene Blue Adsorption from ZnO/Activated Carbon Nanocompossites Prepared by Pyrolysis of Molten ZnCl2 with Rice Husks

Luyen

2023

MaP

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“…In addition, biochar was more significant (p < 0.05) in decreasing the Cd bioavailability and improving the biomass of peanuts. Wang et al [30] demonstrated a facile pyrolytic synthesis of biochar/ZnO passivators, their use in Cu(II) immobilization, and the mechanism of that process. Biochar was prepared from waste pomelo peel that was combined with ZnO to immobilize Cu(II) in contaminated soil, and the maximum adsorption capacity was 216.37 mg/g.…”

Section: Discussionmentioning

confidence: 99%

Evaluating the Heavy Metal Risk in Spinacia oleracea L. and Its Surrounding Soil with Varied Biochar Levels: A Pot Experiment

Xiang

Long

2021

Sustainability

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Spinacia oleracea L., as the most widely cultivated green leafy vegetable in China, can threaten human health in cases of its excessive heavy metal content, especially in mining areas of karst landforms. Therefore, the present study mainly investigates whether biochar is useful for remediating heavy metal pollution in soil and S. oleracea and the degree of this improvement in karst areas. The effects of heavy metal exposure on the health of children and adults in S. oleracea and rhizosphere lime soil with six biochar levels are evaluated by a health risk assessment, namely, 4000 g of lime soil (C-0), 160 g of biochar + 3840 g of lime soil (C-160), 240 g of biochar + 3760 g of lime soil (C-240), 320 g of biochar + 3680 g of lime soil (C-320), 400 g of biochar + 3600 g of lime soil (C-400) and 800 g of biochar + 3200 g of lime soil (C-800). The results show that the pH values of the lime soil were positively correlated with Pb, P and K contents and negatively correlated with As, Cr, Hg, Cd and N contents in S. oleracea. The assessments of the potential ecological risk index show that the soil samples for the C-0 and C-160 levels pose moderate ecological hazards, while the soil samples for the C-320, C-800, C-400 and C-240 levels constitute mild ecological hazards. The single noncarcinogenic risks, total noncarcinogenic risk indexes, single carcinogenic risks and total carcinogenic risks values indicate that exposure to heavy metals in lime soil and S. oleracea poses a serious threat to human health. It also presents an unacceptable cancer risk and children are more threatened than adults. Our results suggest that heavy metal pollution of S. oleracea and its rhizosphere lime soil in karst areas still poses a threat to human health after adding biochar, and the relevant local departments need to implement more active measures to solve the excessive heavy metal contents in the local soil and vegetables of this karst regions.

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“…Wang et al activated ZnCl 2 and sewage sludge through microwave irradiation. ZnO/biochar was prepared using a two-step method by impregnation/chemical coprecipitation of biochar in zinc-containing salt or impregnation of biochar with ZnO nanoparticles in acid/basic media. ,− ZnO nanoparticles were then loaded on the biochar surface through self-reduction. ZnCl 2 has been successfully used as an activating agent in the synthesis of porous carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

et al. 2023

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In this work, we developed a facile one-step pyrolysis method for preparing porous ZnO/biochar nanocomposites (ZBCs) with a large surface area to enhance the removal efficiency of dye from aqueous solution. Peanut shells were pyrolyzed under oxygen-limited conditions with a molten salt ZnCl 2 , which played the roles of the activating agent and precursor for the formation of nanoparticles. The effects of the mass ratio between the molten salt ZnCl 2 and peanut shells as well as pyrolysis temperature on the formation of ZBCs were investigated. Characterization results revealed that the as-synthesized ZBCs exhibited a highly porous structure with a specific surface area of 832.12 m 2 /g, suggesting a good adsorbent for efficient removal of methylene blue (MB). The maximum adsorption capacity of ZBCs on MB was 826.44 mg/g, which surpassed recently reported adsorbents. The formation mechanism of ZnO nanoparticles on the biochar surface was due to ZnCl 2 vaporization and reaction with water molecules extracted from the lignocellulosic structures. This study provides a basis for developing a simple and large-scale synthesis method for wastewater with a high adsorption capacity.

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A facile pyrolysis synthesis of biochar/ZnO passivator: immobilization behavior and mechanisms for Cu (II) in soil

Cited by 21 publications

References 40 publications

Enhancement of Methylene Blue Adsorption from ZnO/Activated Carbon Nanocompossites Prepared by Pyrolysis of Molten ZnCl2 with Rice Husks

Enhancement of Methylene Blue Adsorption from ZnO/Activated Carbon Nanocompossites Prepared by Pyrolysis of Molten ZnCl2 with Rice Husks

Evaluating the Heavy Metal Risk in Spinacia oleracea L. and Its Surrounding Soil with Varied Biochar Levels: A Pot Experiment

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

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