Bioadsorbent and adsorbent-based heavy metal removal technologies from wastewater: new insight

Tiwari, Amit Kumar; Pal, Sunder Lal; Srivastava, Neha; Shah, Maulin P.; Ahmad, Irfan; Alshahrani, Mohammad Y.; Pal, Dan Bahadur

doi:10.1007/s13399-022-02343-1

Cited by 15 publications

(1 citation statement)

References 77 publications

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“…Nowadays, water pollution by Metal Trace Elements (MTE) is of growing con-cern as it represents a major risk to human and environmental health due to their toxicity and their non-biodegradability [1] [2]. Among the MTE, hexavalent and trivalent chromium are the two most stable and widespread oxidation states of chromium in the environment.…”

Section: Introductionmentioning

confidence: 99%

Hexavalent Chromium Cr (VI) Removal from Water by Mango Kernel Powder

Gning,

Gaye,

Kama

et al. 2024

MSCE

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Metal trace elements (MTE) are among the most harmful micropollutants of natural waters. Eliminating them helps improve the quality and safety of drinking water and protect human health. In this work, we used mango kernel powder (MKP) as bioadsorbent material for removal of Cr (VI) from water. Uv-visible spectroscopy was used to monitor and quantify Cr (VI) during processing using the Beer-Lambert formula. Some parameters such as pH, mango powder, mass and contact time were optimized to determine adsorption capacity and chromium removal rate. Adsorption kinetics, equilibrium, isotherms and thermodynamic parameters such as ΔG˚, ΔH˚, and ΔS˚, as well as FTIR were studied to better understand the Cr (VI) removal process by MKP. The adsorption capacity reached 94.87 mg/g, for an optimal contact time of 30 min at 298 K. The obtained results are in accordance with a pseudo-second order Freundlich adsorption isotherm model. Finally FTIR was used to monitor the evolution of absorption bands, while Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) were used to evaluate surface properties and morphology of the adsorbent.

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Section: Introductionmentioning

confidence: 99%

Hexavalent Chromium Cr (VI) Removal from Water by Mango Kernel Powder

Gning,

Gaye,

Kama

et al. 2024

MSCE

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MXene—Reclaimed Cellulose Acetate Composites for Methylene Blue Removal Through Synergistic Adsorption and Photocatalysis

Subash,

Sen,

Naebe

et al. 2024

Polymers for Advanced Techs

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The rapid growth in textile industries has led to a significant discharge of dyed water into water sources, posing severe threats to human and environmental health. Methylene blue (MB), crucial for medical diagnostics and dyeing, requires effective removal due to its toxicological and environmental hazards, persisting above 1 ppm in aqueous solutions at ambient temperatures. Reclaiming cellulose acetate not only heralds a sustainable approach to water reclamation but also amalgamates natural purification with technological advancements. The study utilized reclaimed cellulose acetate to fabricate electrospun nanofibers and bead adsorbents using Ti3C2Tx and surface‐modified Ti3C2Tx via liquid‐state microwaving. The research investigated surface chemistry, morphology, and the impact of adsorption conditions on MB adsorption, revealing enhanced uptake capacities from 45% to 93% for nanofibers and 40%–80% for beads at 25°C after 2 and 3 h, respectively. Adsorption followed PSO kinetics and Langmuir isotherms, with thermodynamic analysis indicating an endothermic, spontaneous physisorption process with ΔH and ΔS values obtained 0.008–31.33 kJ·mol−1 and 11.95–116.38 J·mol−1·K−1. Furthermore, the CA‐surface‐modified Ti3C2Tx composite demonstrated significant photocatalytic activity, achieving 96% degradation efficiency compared to Ti3C2Tx alone. The biodegradation assay under natural conditions using an in‐house degradation slurry showed 20%–58% degradation of the spent adsorbents over 120 days.

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