Abstract
Tebuthiuron (C9H16N4OS) offers farmers a cost-effective chemical solution to control weeds. Nevertheless, it can manifest as a hazardous organic compound to society and the environment as it escapes from agroecosystems into the surroundings via leaching and running off, polluting surface and underground water bodies. Hence, research was designed to analyze whether hydrochar can develop an adsorbent to remove it from an aqueous solution. Food waste was reacted with subcritical water at a stoichiometric 1:4 ratio (m v−1) and 1.5 M potassium hydroxide (KOH) at 10 g L−1 at 250 °C and 1.5 MPa for 2 h to produce porous hydrochar via simultaneous hydrothermal carbonization and chemical activation. The product at 25, 50, and 100 mg L−1 was tested for its ability to adsorb tebuthiuron (TBT) at 0.5, 1, and 1.5 mg L−1 by spectrophotometry. In addition, kinetic and isothermal models were applied to experimental data to describe the separation of the pollutant from the liquid-phase analytical environment. Equally significant, an ecotoxicological assay was developed to investigate its remediative potential; Lactuca sativa was employed as a testing organism, as it is responsive to TBT at phytotoxic residual quantity. Hydrochar significantly separated TBT from aqueous media. Such honeycomb-structured mesoporous carbonaceous matrix developed approximately 1420.1 m2 g−1 specific surface area and 0.05 cm3 g−1 total pore volume; hence, at the highest concentration, it adsorbed 98.65% of TBT at 1.5 mg L−1 through physical (e.g., pore filling and interparticle diffusion) or chemical (e.g., H-bonding, π-stacking, and metal-adsorbate complex) forces. In addition, it allowed seven adsorption-desorption cycles with 80% efficiency, supporting excellent regenerability. Equally significant, L. sativa germinated 76.6% on plates containing residual solution from sorption testing, validating the hydrochar for environmental bioremediation. Hence, it can advance the field’s prominence in treating TBT by bioadsorption. It can offer stakeholders across agroindustries possibilities to remediate such a compound in aquatic environments, such as water and wastewater.
Graphical Abstract
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Data availability
Experimental data and materials will be available from the corresponding authors on reasonable request.
Abbreviations
- BET:
-
Brunauer-Emmett-Teller
- BJH:
-
Barret-Joyner-Halenda
- CBN:
-
Carbon black nanoparticle
- EFM:
-
Electric force microscopy
- FTIR:
-
Fourier-transform infrared
- HTC:
-
Hydrothermal carbonization
- IUPAC:
-
International Union of Pure and Applied Chemistry
- LCA:
-
Life-cycle assessment
- LD50 :
-
Median lethal dose
- MOF:
-
Metal-organic framework
- pHpzc :
-
Point of zero charge
- POF:
-
Porous organic framework
- SEM:
-
Scanning electron microscopy
- TBT:
-
Tebuthiuron
- TEA:
-
Techno-economic analysis
- XRD:
-
X-ray diffractometry
- ZIF:
-
Zeolite imidazolate framework
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Acknowledgements
The authors are grateful to the São Paulo Research Foundation (Fapesp scholarship #2021/01884-6) and Coordination for the Improvement of Higher Education Personnel (CAPES grant #001) for financial support. In addition, we are grateful to the Analytical Center of the Laboratory for Research in Chemistry of Natural Products and New Synthetic Methodologies (CALPQPN) for technical assistance.
Funding
The São Paulo Research Foundation (Fapesp scholarship #2021/01884-6), National Council for Scientific and Technological Development (CNPq grant #313530/2021-1), and Coordination for the Improvement of Higher Education Personnel (CAPES grant #001) financially supported this study.
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Bruno Rafael de Almeida Moreira: conceptualization, data curation, methodology, formal analysis, writing—original draft, writing—review and editing; Victor Hugo Cruz: conceptualization, investigation, methodology; Marcelo Rodrigues Barbosa Júnior: investigation; Leonardo Gomes de Vasconcelos: methodology; Rouverson Pereira da Silva: funding acquisition, supervision; Paulo Renato Matos Lopes: writing—review and editing, funding acquisition, supervision.
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Moreira, B.R.d., Cruz, V.H., Barbosa Júnior, M.R. et al. Adsorption of tebuthiuron on hydrochar: structural, kinetic, isothermal, and mechanistic modeling, and ecotoxicological validation of remediative treatment of aqueous system. Biomass Conv. Bioref. (2023). https://doi.org/10.1007/s13399-023-04365-9
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DOI: https://doi.org/10.1007/s13399-023-04365-9