Nitric acid surface pre-modification of novel Lasia spinosa biochar for enhanced methylene blue remediation

Fernando, Janeshta C.; Peiris, Chathuri; Navarathna, Chanaka; Gunatilake, Sameera R.; Welikala, Upekshya; Wanasinghe, Sachithra T.; Madduri, Sunith; Jayasinghe, Sehan; Mlsna, Todd; Hassan, El Barbary; Ferez, Felio

doi:10.1016/j.gsd.2021.100603

Cited by 21 publications

(15 citation statements)

References 51 publications

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“…As suggested by the results in Table , acetamiprid or imidacloprid adsorption on NFMBC biochar occurred primarily via multi-layered adsorption (Freundlich isotherms have the best fit with experimental data) . On the other hand, methomyl was preferably adsorbed on NFMBC biochar via an energetically heterogeneous, non-uniform surface mode (the Sips model has the best fit with experimental data). − Previous studies have also demonstrated the use of the Sips isotherm model to describe the adsorption of dyes and pesticides on biochar and its effectiveness in predicting adsorption behavior at a range of adsorbate concentrations. − …”

Section: Resultsmentioning

confidence: 84%

Biochar Derived from Pineapple Leaf Non-Fibrous Materials and Its Adsorption Capability for Pesticides

et al. 2023

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Non-fibrous materials (NFMs) are typically discarded during pineapple leaf fiber processing. The underutilized NFM waste was proposed for use in this work as a raw material for the production of biochar . The removal of pesticides (acetamiprid, imidacloprid, or methomyl) from water was then investigated using the NFM derived biochar (NFMBC). The pseudo-secondorder kinetic data suggested chemisorption of pesticide on NFMBC. While acetamiprid or imidacloprid adsorption on NFMBC occurred primarily via multi-layered adsorption (best fitted with the Freundlich isotherms), the Sips adsorption isotherms matched with the experimental data, implying heterogeneous adsorption of methomyl on the biochar surface. The adsorption capacities for acetamiprid, methomyl, and imidacloprid are 82.18, 36.16, and 28.98 mg g −1 , respectively, which are in agreement with the order of the polarity (low to high) of pesticides. Adsorption capacities indicated that the NFMBC preferably removed low-polarity pesticides from water sources. Since pineapple leaves provide fibers and NFMs for materials development, this study should promote an extended agro-waste utilization approach and full-cycle resource management in pineapple fields.

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Section: Resultsmentioning

confidence: 84%

Biochar Derived from Pineapple Leaf Non-Fibrous Materials and Its Adsorption Capability for Pesticides

et al. 2023

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“…This model assumes that the rate-limiting step is the chemisorption process of the adsorbate to the adsorbent. (6) The pseudo first and the pseudo second order models do not provide information about the contribution of the efficiency of adsorbate diffusion towards the rate of the adsorption. Therefore, the intraparticle diffusion kinetic model, Eq.…”

Section: Adsorption Isotherms and Kineticsmentioning

confidence: 99%

“…The properties of biochar vary significantly with feedstock type, pyrolysis conditions, and any activation performed [5]. Feedstock should be inexpensive or abundantly available, while the produced adsorbent should have the optimum porosity and surface functionality to adsorb the targeted pollutant [6]. Activation refers to enhancing the adsorption capacity of the adsorbate for a selected adsorbent through either physical or chemical methods.…”

Section: Graphical Abstract 1 Introductionmentioning

confidence: 99%

Facile, green approach for aqueous methylene blue dye adsorption: Coconut vinegar treated Trema orientalis wood biochar

Udawatta¹,

Silva²,

Silva³

2022

Environmental Engineering Research

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Biochar is widely utilized in low-cost water treatment. However, chemicals used in most of the recorded activation techniques are corrosive, may cause secondary pollution, and not accessible by rural communities, reducing their value of being cost-effective. In this study, Trema orientalis wood biochar (WB) was successfully activated with natural coconut vinegar employing a facile technique to produce a green adsorbent for efficient aqueous methylene blue (MB) removal. Batch studies showed a three-fold higher MB adsorption capacity of coconut vinegar treated wood biochar (CVWB) compared to WB. Percentage removal ranged between 98-79% at lower dye concentrations (50-100 mg/L) and 79-48% at higher dye concentrations (100-300 mg/L). Isotherm data best fitted to the Freundlich model. Kinetic data fitted to both pseudo second order and intraparticle diffusion models, suggesting that the adsorption was governed by a pore filling mechanism with predominant electrostatic attractions, and the reaction rate was diffusion controlled. FTIR, XPS, and water contact angle measurements confirmed increased surface oxygenated groups of CVWB. XPS showed a three-fold increase in O/C atomic ratio. BET and AFM studies gave evidence to the increased porosity. Therefore, the enhanced MB adsorption capacity of CVWB was attributed to both the increased surface oxygenated functional groups and porosity.

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“…[21] Fernando et al have reported that nitric acid-modified Lasia BC has a 9 fold enhanced maximum adsorption capacity on MB removal. [18] Moreover, Kuang et al have done an anionic surfactant modification on AC for the removal of cationic MB and reported that there is a significant enhancement in adsorption. [22] Hence, it is obvious that the presence of surface functionality and the method of surface functionalization of an adsorbent such as BC/ AC play a crucial role in its adsorption processes and capability.…”

Section: Introductionmentioning

confidence: 99%

Low‐Carbon‐Footprint Plasma‐Functionalized Coconut‐Coir‐Based Porous Carbon as an Efficient and Sustainable Adsorbent

Jayasinghe,

Munaweera,

Perera

et al. 2024

ChemistrySelect

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Herein, the surface of pyrolyzed coconut coir (PCC) dust has been functionalized using atmospheric plasma under non‐equilibrium conditions without utilizing vacuum chambers. The reactive species present in the plasma such as, molecular ions, electrons, and radicals interact with PCC's surface, leading to the introduction of epoxy, carbonyl and amino functional groups on carbon surface. The resulting plasma functionalized carbon (PFC) material was characterized using several advanced material characterization techniques, including PXRD, FTIR, XPS, N2 BET specific surface area, SEM and TEM imaging techniques, etc. Moreover, it has been used in diverse applications in toxic gas removal (CO2, CO, NOx), fluoride (F−) removal from drinking water and cationic organic dye (methylene blue–MB) removal. The reported method for synthesis of functional carbon introduces a platform technology for low carbon footprint, green synthesis of advanced functional materials.

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Nitric acid surface pre-modification of novel Lasia spinosa biochar for enhanced methylene blue remediation

Cited by 21 publications

References 51 publications

Biochar Derived from Pineapple Leaf Non-Fibrous Materials and Its Adsorption Capability for Pesticides

Biochar Derived from Pineapple Leaf Non-Fibrous Materials and Its Adsorption Capability for Pesticides

Facile, green approach for aqueous methylene blue dye adsorption: Coconut vinegar treated Trema orientalis wood biochar

Low‐Carbon‐Footprint Plasma‐Functionalized Coconut‐Coir‐Based Porous Carbon as an Efficient and Sustainable Adsorbent

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