Zanthoxylum bungeanum branches activated carbons with rich micropore structure prepared by low temperature H3PO4 hydrothermal pretreatment method for toluene adsorption

Xie, Lihua; Meng, Yan; Wang, Qiren; Zhang, Guizhi; Xie, Hongmei; Zhou, Guilin

doi:10.1016/j.diamond.2022.109474

Cited by 13 publications

(3 citation statements)

References 42 publications

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“…This facilitates the adsorption and diffusion of adsorbate molecules on the AC surface, so the adsorbent has a stronger adsorption capacity. HT140 prepared by pretreatment with acidic water solution has a relatively smooth surface morphology characteristic because the low hydrothermal temperature is not end to H 3 PO 4 penetrating into cellulose and hemicellulose in biomass raw materials for catalytic decomposition, 24 which cannot achieve the purpose of etching and pore formation, resulting in its relatively smooth surface morphology characteristic. HNO 3 is an oxidizing acid which can assist H 3 PO 4 in pore formation of the biomass raw materials used 25 .…”

Section: Resultsmentioning

confidence: 99%

Effect of pore size distribution of biomass activated carbon adsorbents on the adsorption capacity

Wang,

Li,

Tian

et al. 2024

J of Chemical Tech & Biotech

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BackgroundIn order to investigate the correlation between the pore size distribution of biomass activated carbon adsorbents (BACAs) and VOCs (Volatile Organic Compounds) adsorption/desorption performance. four BACAs with same specific surface area but different pore size distribution were prepared under different experimental conditions and processes.ResultsThe impact of the pore size distribution of BACAs on the adsorption/desorption performance of benzene, toluene and xylene was investigated. The results indicated that the adsorption ability of the prepared BACAs for benzene, toluene, and xylene was mostly affected by the pore size distributed in 2.60 ~ 3.25 nm, 2.68 ~ 3.35 nm and 4.20 ~ 4.90 nm, respectively, when the studied BACAs had similar specific surface area (SBET ≈ 1080 m2/g). However, the desorption amount of adsorbed benzene molecules mainly relies on the pore structure of the BACAs with the pore size distributed in 3.95 ~ 4.60 nm.ConclusionThe pore structures of BACAs distributed in different pore size ranges have various effects on the phenyl VOCs adsorption capacity. Benzene adsorption on the BACAs were mainly affected by the microporous structures. The pore structure with larger pore size was more favorable for the desorption of the adsorbed toluene and xylene molecules compared to the adsorbed benzene molecules. Benzene, toluene, and xylene had low residual rates in the studied activated carbon adsorbents to show superior regenerative properties. This work could provide an important reference for the design, preparation, and selection of activated carbon adsorbents for the adsorption capacity of benzene, toluene, and xylene.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Effect of pore size distribution of biomass activated carbon adsorbents on the adsorption capacity

Wang,

Li,

Tian

et al. 2024

J of Chemical Tech & Biotech

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“…Zanthoxylum bungeanum (Z. bungeanum) is a small perennial deciduous tree belonging to the Rutaceae family and is valued for its use as a spice, food condiment, and medicinal herb. It holds considerable medicinal and culinary importance worldwide [28]. China, a major producer of Z. bungeanum, currently cultivates it over an area of approximately 73.5 thousand km 2 , and this cultivation has established it as a distinctive and thriving industry within the country [29].…”

Section: Introductionmentioning

confidence: 99%

Zanthoxylum bungeanum Waste-Derived High-Nitrogen Self-Doped Porous Carbons as Efficient Adsorbents for Methylene Blue

Zhao,

Zhang,

Gong

et al. 2024

Molecules

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In this study, we prepared high-nitrogen self-doped porous carbons (NPC1 and NPC2) derived from the pruned branches and seeds of Zanthoxylum bungeanum using a simple one-step method. NPC1 and NPC2 exhibited elevated nitrogen contents of 3.56% and 4.22%, respectively, along with rich porous structures, high specific surface areas of 1492.9 and 1712.7 m2 g−1 and abundant surface groups. Notably, both NPC1 and NPC2 demonstrated remarkable adsorption abilities for the pollutant methylene blue (MB), with maximum monolayer adsorption capacities of 568.18 and 581.40 mg g−1, respectively. The adsorption kinetics followed the pseudo-second-order kinetics and the adsorption isotherms conformed to the Langmuir isotherm model. The adsorption mechanism primarily relied on the hierarchical pore structures of NPC1 and NPC2 and their diverse strong interactions with MB molecules. This study offers a new approach for the cost-effective design of nitrogen self-doped porous carbons, facilitating the efficient removal of MB from wastewater.

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“…In order to further optimize the pore structure of the prepared activated carbon materials, the Zanthoxylum bungeanum branches biomass activated carbons with the speci c surface area and micropore ratio of 1290.9 m 2 /g and 63.4%, respectively, are prepared by the joint H 3 PO 4 activation and "hydrothermal-low temperature carbonization-high temperature activation" process. Although the toluene adsorption capacity can reach 532.9 mg/g, the corresponding activated carbon has poor toluene adsorption cycle regeneration performance (Xie et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Activated carbon with high mesopore ratio derived from waste Zanthoxylum bungeanum branches by KNO3-assisted H3PO4 staged activation for toluene adsorption

Xie,

Liu,

Wang

et al. 2023

Environ Sci Pollut Res

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Waste Zanthoxylum bungeanum branches were used to prepare activated carbon adsorbents with high mesopore ratio by H 3 PO 4 staged activation method with adding KNO 3 additive. The prepared activated carbon adsorbents were characterized by SEM, BET, FT-IR, and XRD.The adsorption properties of the prepared activated carbon adsorbents were evaluated by the toluene adsorption/desorption in air. The quasi-rst-order, quasi-second-order, and Bangham models were used to t the obtained toluene adsorption results. The oxidative etching of KNO 3 additive improved the pore-forming ability of the H 3 PO 4 activator to enhance the activation pore-forming effects of the selected biomass raw material. The secondary pore-forming effects of K atoms promoted the effective expansion of the pore diameter in the activated carbon preparation process to prepare activated carbon adsorbents with high mesopore proportion. The speci c surface area and mesopore proportion of the activated carbon adsorbents prepared by adding KNO 3 additive exceeded 1100 m 2 /g and 71.0%, respectively, and the toluene adsorption capacity exceeded 370.0 mg/g. The rich mesopore structures can effectively reduce the toluene mass transfer resistance, which can promote the corresponding activated carbon adsorbent to be regenerated by low-temperature (40 °C) thermal desorption. The toluene adsorption on the prepared activated carbon adsorbents include surface adsorption and diffusion in pore strucutres, and the toluene adsorption mechanism is more consistent with the Bangham kinetic model.

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Zanthoxylum bungeanum branches activated carbons with rich micropore structure prepared by low temperature H3PO4 hydrothermal pretreatment method for toluene adsorption

Cited by 13 publications

References 42 publications

Effect of pore size distribution of biomass activated carbon adsorbents on the adsorption capacity

Effect of pore size distribution of biomass activated carbon adsorbents on the adsorption capacity

Zanthoxylum bungeanum Waste-Derived High-Nitrogen Self-Doped Porous Carbons as Efficient Adsorbents for Methylene Blue

Activated carbon with high mesopore ratio derived from waste Zanthoxylum bungeanum branches by KNO3-assisted H3PO4 staged activation for toluene adsorption

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