KOH-activated biochar and chitosan composites for efficient adsorption of industrial dye pollutants

Su, Xu; Wang, Xuanming; Ge, Ziyi; Bao, Zhengrong; Lin, Li; Chen, Yixuan; Dai, Wanning; Sun, Yuanyuan; Yuan, Hechong; Yang, Wen; Meng, Jun; Wang, Hailong; Pillai, Suresh C.

doi:10.1016/j.cej.2024.150387

Cited by 14 publications

(2 citation statements)

References 77 publications

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“…Before adsorption, the C1s spectra (Figure 8A) reveal peaks at 284.8, 286.33, 287.74 and 289.17 eV, corresponding to the C-H, C-O, C-N and C=O bonds, respectively [34,63]. The N1s spectra before adsorption (Figure 8C) display peaks at 399.45 and 402.29 eV, indicative of -NH 2 and N + bonds [64]. After adsorption, an augmentation in the C=C peak at 283.33 eV is noted in Figure 8B, possibly due to the adsorbed MO or π-π interactions between MO and the microspheres.…”

Section: Adsorption Mechanismsmentioning

confidence: 99%

Enhanced Adsorption of Methyl Orange from Aqueous Phase Using Chitosan–Palmer Amaranth Biochar Composite Microspheres

Chen,

Yin,

Zhang

et al. 2024

Molecules

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To develop valuable applications for the invasive weed Palmer amaranth, we utilized it as a novel biochar source and explored its potential for methyl orange adsorption through the synthesis of chitosan-encapsulated Palmer amaranth biochar composite microspheres. Firstly, the prepared microspheres were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy and were demonstrated to have a surface area of 19.6 m2/g, a total pore volume of 0.0664 cm3/g and an average pore diameter of 10.6 nm. Then, the influences of pH, dosage and salt type and concentration on the adsorption efficiency were systematically investigated alongside the adsorption kinetics, isotherms, and thermodynamics. The results reveal that the highest adsorption capacity of methyl orange was obtained at pH 4.0. The adsorption process was well fitted by a pseudo-second-order kinetic model and the Langmuir isotherm model, and was spontaneous and endothermic. Through the Langmuir model, the maximal adsorption capacities of methyl orange were calculated as 495.0, 537.1 and 554.3 mg/g at 25.0, 35.0 and 45.0 °C, respectively. Subsequently, the adsorption mechanisms were elucidated by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy investigations. It is indicated that electrostatic interactions, hydrogen bonding, π–π interactions and hydrophobic interactions between methyl orange and the composite microspheres were pivotal for the adsorption process. Finally, the regeneration studies demonstrated that after five adsorption–desorption cycles, the microspheres still maintained 93.6% of their initial adsorption capacity for methyl orange. This work not only presents a promising method for mitigating methyl orange pollution but also offers a sustainable approach to managing Palmer amaranth invasion.

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Section: Adsorption Mechanismsmentioning

confidence: 99%

Enhanced Adsorption of Methyl Orange from Aqueous Phase Using Chitosan–Palmer Amaranth Biochar Composite Microspheres

Chen,

Yin,

Zhang

et al. 2024

Molecules

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“… [organic dye] o persistent biochar capacity (mg g −1 ) modified biochar capacity (mg g −1 ) ref. methylene blue (50 mg l −1 ) unmilled bagasse biochar 17.20 ball-milled bagasse biochar 354.00 [ 105 ] methylene blue (100 mg l −1 ) sorghum straw biochar 43.28 Fe 3 O 4 -loaded biochar 128.51 [ 106 ] methylene blue (100 mg l −1 ) chitosan-loaded biochar 8.83 KOH-activated biochar 62.04 [ 107 ] Congo red (50 mg l −1 ) Acacia auriculiformis biochar 4.00 FeCl 3 -modified biochar 130.00 [ 108 ] Congo red (500 mg l −1 ) Medulla Tetrapanacis biochar 580.83 urea/CaCl co-modified biochar 2512.82 [ 109 ] Congo red (50 mg l −1 ) green pea peel biochar 62.11 ZnO-green pea peel biochar 114.94 [ 110 ] …”

Section: Biochar Modification Techniquesmentioning

confidence: 99%

Advancements in application of modified biochar as a green and low-cost adsorbent for wastewater remediation from organic dyes

Hama Aziz,

Fatah,

Muhammad

2024

R. Soc. Open Sci.

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Synthetic organic dyes, which are resistant to biodegradation, pose a notable health risk, potentially leading to cancer and respiratory infections. Researchers have addressed this concern by exploring physicochemical methods to remove organic dyes from wastewater. A particularly promising solution involves modified biochar adsorbents, which demonstrate high efficiency in organic dye removal. Biochar, a charcoal-like material derived from biomass pyrolysis, offers advantages such as low cost, eco-friendliness, high efficiency and reusability. Beyond its role in sustainable soil remediation, biochar proves effective in removing organic dyes from wastewater after undergoing physical or chemical modification. Acid–base activation or metal–heteroatom impregnation enhances biochar's adsorption capacity. This comprehensive review examines the attributes of biochar, common methods for production and modification, and the impacts of raw materials, pyrolysis temperature, heating rate and residence time. It further elucidates the biochar adsorption mechanism in the removal of organic dyes, assessing factors influencing efficiency, including biochar feedstock, solution pH, adsorption temperature, particle size, initial dye concentration, biochar dosage and reaction time. It explores challenges, opportunities, reusability and regeneration methods of biochar in treating organic dye wastewater. It also discusses recent advances in organic dye removal using adsorption-based biochar. The review ultimately advocates for enhancing biochar's adsorption performance through post-modification.

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Enhanced Fluoride Removal in Wastewater Using Modified Activated Carbon in FCDI Systems

Xiong,

Sun,

Jiao

et al. 2024

Water Air Soil Pollut

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KOH-activated biochar and chitosan composites for efficient adsorption of industrial dye pollutants

Cited by 14 publications

References 77 publications

Enhanced Adsorption of Methyl Orange from Aqueous Phase Using Chitosan–Palmer Amaranth Biochar Composite Microspheres

Enhanced Adsorption of Methyl Orange from Aqueous Phase Using Chitosan–Palmer Amaranth Biochar Composite Microspheres

Advancements in application of modified biochar as a green and low-cost adsorbent for wastewater remediation from organic dyes

Enhanced Fluoride Removal in Wastewater Using Modified Activated Carbon in FCDI Systems

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