Preparation of thiourea-modified magnetic chitosan composite with efficient removal efficiency for Cr(VI)

Cai, Weiquan; Zhu, Feng; Liang, Hong; Jiang, Yihong; Tu, Wenjun; Cai, Zhenghao; Wu, Junrong; Zhou, Jiabin

doi:10.1016/j.cherd.2019.01.031

Cited by 42 publications

(4 citation statements)

References 50 publications

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“…In contrast, SO 2− 4 and PO 3− 4 significantly influenced the adsorption of Cr(VI): the removal efficiency of the C. formosanus nest decreased by 6.3% and 34.2%, respectively, while the O. formosanus nest showed a more pronounced decrease of 12.9% and 16.9%. This variation may be due to the molecular size of SO 2− 4 and PO 3− 4 anions being similar to the ionic radius of HCrO − 4 (Cai et al, 2019). Overall, the impact of coexisting ions on Cr(VI) adsorption by termite nests is relatively minor.…”

Section: Adsorption Of Cr(vi) Under DI Erent Conditionsmentioning

confidence: 98%

Removal of chromate in aqueous solutions by termite nests and reduction chromate accumulation in Brassica chinensis L.

Wang,

Zhou

et al. 2024

Front. Sustain. Food Syst.

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Chromate [Cr(VI)] is a highly toxic heavy metal element, representing one of the most prevalent sources of wastewater contamination. It poses a significant threat to human health and food safety. Therefore, effective treatment before discharging wastewater is of paramount importance. In this study, termite nests (Coptotermes formosanus and Odontotermes formosanus), as natural biomass materials, were used to adsorb Cr(VI) ions in wastewater as a strategy to reduce environmental pollution and minimize poisoning by Cr. Structural and morphological characterizations were performed using scanning electron microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. Batch adsorption experiments were conducted to evaluate the influence of termite nest dosage, coexisting ions, and pH. To gain further insight, detailed studies on adsorption kinetics, adsorption isotherms, and adsorption thermodynamics were undertaken. The results indicate that under acidic pH conditions, both termite nests exhibit the highest adsorption capacity for Cr(VI), with an optimal adsorbent dosage of 10 g/L. The maximum adsorption capacities of C. formosanus nest and O. formosanus nest for Cr(VI) were found to be 48.52 mg/g and 35.99 mg/g, respectively. Thermodynamic studies confirmed the spontaneous and endothermic nature of the adsorption process. In the rapeseed cultivation experiment, the growth status of Brassica chinensis L. post-adsorption treatment was markedly improved compared to the untreated group. Additionally, the concentration of Cr(VI) in the plants was significantly reduced. This demonstrates both the inhibitory effect of Cr(VI) on the growth of oilseed rape and the effectiveness of water remediation techniques. In addition, both types of termite nests can be effectively reused by 0.1 mol/L HCl. To the best of our knowledge, this is the first report of adsorption removal of Cr(VI) by C. formosanus nest and O. formosanus nest. Compared to traditional natural biomass adsorbents, termite nests exhibit a relatively higher adsorption capacity for Cr(VI). The results of this study demonstrate that subterranean termite nests can efficiently remove Cr(VI) from wastewater, offering the potential for a cost-effective and reusable bioremediation agent with the advantages of ease of operation.

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Section: Adsorption Of Cr(vi) Under DI Erent Conditionsmentioning

confidence: 98%

Removal of chromate in aqueous solutions by termite nests and reduction chromate accumulation in Brassica chinensis L.

Wang,

Zhou

et al. 2024

Front. Sustain. Food Syst.

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“…Redox affects the chemical behavior of elements by changing their existing forms, mainly occurring in heavy metals with variable valence. Cai et al 158 studied the adsorption mechanism and found that under acidic conditions, strongly oxidizing Cr( vi ) can be reduced to Cr( iii ) through the reducing –OH group in the adsorbent. According to FTIR and XPS spectra, Zheng et al 140 explained that the main adsorption mechanism of the prepared magnetic chitosan biopolymer (VMCP) was that Cr( vi ) was adsorbed on the positively charged VMCP surface and Cr( vi ) was reduced to Cr( iii ), followed by the coordination between Cr( iii ) and N atoms ( Fig.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Modified magnetic chitosan materials for heavy metal adsorption: a review

Wang

Zhang

et al. 2023

RSC Adv.

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“… Cai et al (2019) , Cho et al (2015) , Huang et al (2019b) , Lee et al (2020) , Liu and Edgar (2015b) , Lu et al (2019) , Ni et al (2019) , Rogge and Stevens (2004) , Singh et al (2019) , Suflet et al (2015) .…”

Section: Uncited Referencesmentioning

confidence: 99%

Potential applications of hydrophobically modified inulin as an active ingredient in functional foods and drugs - A review

Usman

Zhang

Patil

et al. 2021

Carbohydrate Polymers

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Preparation of thiourea-modified magnetic chitosan composite with efficient removal efficiency for Cr(VI)

Cited by 42 publications

References 50 publications

Removal of chromate in aqueous solutions by termite nests and reduction chromate accumulation in Brassica chinensis L.

Removal of chromate in aqueous solutions by termite nests and reduction chromate accumulation in Brassica chinensis L.

Modified magnetic chitosan materials for heavy metal adsorption: a review

Potential applications of hydrophobically modified inulin as an active ingredient in functional foods and drugs - A review

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