Biosorption potential of Gliricidia sepium leaf powder to sequester hexavalent chromium from synthetic aqueous solution

Suganya, E.; Narayanan, S. Lakshmi; Patra, Chandi; Varghese, Lity Alen; Selvaraju, N.

doi:10.1016/j.jece.2019.103112

Cited by 35 publications

(5 citation statements)

References 33 publications

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“…The value of n F (adsorption intensity) represents the distribution of bonded metal ions on the surface of adsorbents, and 1/ n F in the range of 0 to 1 signifies the favorable condition for Cr(VI) adsorption on the adsorbent surface. 47 In the presented data, the value of 1/ n F lies in the range of 0 to 1, which support favorable adsorption conditions, and hence, multilayer adsorption is the dominating factor for Cr(VI) removal by human hair. The 1/ n F value less than 1 showed that significant Cr adsorption takes place at lower concentrations of adsorbents.…”

Section: Resultssupporting

confidence: 66%

“…The Freundlich isotherm model suggests the adsorption to be a reversible multi-layered process on heterogeneous surfaces. The value of n F (adsorption intensity) represents the distribution of bonded metal ions on the surface of adsorbents, and 1/ n F in the range of 0 to 1 signifies the favorable condition for Cr(VI) adsorption on the adsorbent surface . In the presented data, the value of 1/ n F lies in the range of 0 to 1, which support favorable adsorption conditions, and hence, multilayer adsorption is the dominating factor for Cr(VI) removal by human hair.…”

Section: Resultsmentioning

confidence: 52%

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Efficient Biosorption of Hexavalent Chromium from Water with Human Hair

2022

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The triphenyl group (trityl radical) possessing three-phenyl rings, self-assembled through aromatic π–π stacking interactions, can form interesting crystalline organic nano-flowers. In this work, we have synthesized a hybrid material of 1,2-bis(tritylthio)ethane and magnetite, which reduces toxic Cr(VI) to non-toxic Cr(III). We validated the efficacy of the hybrid in reducing toxic Cr(VI) along with three other adsorbent systems. Among the five adsorbent systems tested, we observed that human hair has higher Cr removal efficiency, which prompted us to explore further using different mechanical forms of human hair. Pulverized hair (PH), hair powder (HP), and raw hair (RH) were evaluated by employing different reaction factors such as the adsorbent dose, pH, initial Cr(VI) concentration, and contact time. The comparative evaluation showed that PH has greater adsorption capacity (15.14 mg/g), followed by RH (13.27 mg/g) and HP (10.5 mg/g). While investigating the adsorption mechanism, we observed that it follows pseudo-second-order kinetics suggesting chemisorption. The Freundlich isotherm model fitted well for Cr(VI) adsorption by human hair, suggesting a multi-layered adsorption process. Overall, this study promises a cost-effective and eco-friendly bio-adsorbent for Cr(VI), which may be scaled up to design automated industrial waste disposal systems.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 52%

Efficient Biosorption of Hexavalent Chromium from Water with Human Hair

2022

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“…Cr(VI) aff ects physiology, concentrating in the food chain, causes several disorders in human health such as vomiting, bleeding, disturbances, and ulcer in the stomach, kidney, and liver damages, skin rash, weakened immune system and can even lead to sudden death [10,11]. Based on its acute lethal eff ects on human health, WHO and USEPA promulgated the maximal contamination limit for Cr(VI) in drinking water not to exceed 0.05 mg/L and in industrial effl uents is 0.25 mg/L [11,12]. The necessity of its removal from the natural environment rises due to its high desolation rate in the wide pH range of the aqueous phase, non-biodegradable, and obviously due to its toxic nature.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Biomass-Based Waste Materials for the Removal of Chromium (VI) from Wastewater: A Review

et al. 2021

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Hexavalent chromium (Cr(VI)) is a critical pollutant with high toxicity, even at trace concentrations. Cr(VI) is possibly carcinogenic and mutagenic and can produce serious health issues. Hence, it is necessary to remove Cr(VI) from the water before releasing it into the environment. Currently, numerous removal techniques were used. Adsorption is the best method compared to others because it is simple, cheap, highly efficient, and can be used in water having trace concentrations of contaminants. Biomass-based waste materials (BMWs) are found as far better adsorbents than commercially and other available adsorbents. In this study, the existing Cr(VI) removal techniques are reviewed and, a broad range of current research studies of Cr(VI) removal from water by using BMWs are evaluated. This review can be helpful to develop a more efficient, cheap, reliable, and environmentally benign bio-adsorbent. It is obvious after the literature review given herein that BMWs exhibited potential adsorbents for the removal of Cr(VI). Also, the chemically modified adsorbents exhibited a higher adsorption capacity than unmodified adsorbents.

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“…To comprehend the thermodynamic traits of the biosorption Cr(VI) to Zizphus lotus fruit powder, the following equations were utilized to compute several parameters, including ∆G°, ∆H°, and ∆S°: Bael fruit 17.27 [48] Magnolia leaf 12.3 [49] Mangrove leaf powder 54.34 [50] Aspergillus fumigatus 45.5 [51] Oak wood char 3.03 [52] Rhizopus. sp 9.95 [53] Gliricidia sepium leaf powder 33.57 [54] Ziziphus lotus (fruits) 36.11…”

Section: Temperature Effect and Thermodynamic Studymentioning

confidence: 99%

Biosorption of Hexavalent Chromium Cr(VI) onto Ziziphus Lotus Fruits Powder: Kinetics, Equilibrium, and Thermodynamics

El Yakoubi,

El Ansari,

Ennami

et al. 2024

J. Ecol. Eng.

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Ziziphus lotus has been the subject of several researchs because of its nutritional benefits and ecological attributes. The removal of hexavalent chromium Cr(VI) from a solution using powdered Zizphus lotus fruits, for its qualities of being inexpensive as well as environmentally friendly, was investigated. The results obtained showed that at pH = 2, at 30°C, after 600 min of adsorbent/adsorbate contact, with 100 mg/L as initial concentration of Cr(VI) and a biosorbent dosage of 5 g/L, the biosorption of Cr(VI) on Zizphus lotus fruit powder (ZLFP) is at its maximum rate. The sorption process was exothermic (∆H° = -6.69 kJ/mol), and was characterized by a positive entropy values (∆S° = 46.76 J/K mol) suggesting a high affinity of the ZLFP for Cr(VI). Given that the Gibbs free energy (∆G°) is negative and decreases as temperatures increase from 293 to 323 K, the process of biosorption is both feasible and spontaneous. The Temkin model and the Langmuir model both generated excellent fits to the equilibrium data. The maximum monolayer biosorption capacity was 36.11 mg/g. The pseudo second order model was used to fit the kinetic data relating to the adsorption of Cr(VI) on the ZLFP. The FTIR spectral analysis allowed the characterization of the biochemical groups mainly involved in the sorption of Cr(VI) ions on the ZLFP, and which are: N-C, H-O, O-C, H-C, and O=C. The capacity of Ziziphus lotus fruit as an inexpensive, effective, and ecofriendly biosorbent is confirmed through this study.

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Biosorption potential of Gliricidia sepium leaf powder to sequester hexavalent chromium from synthetic aqueous solution

Cited by 35 publications

References 33 publications

Efficient Biosorption of Hexavalent Chromium from Water with Human Hair

Efficient Biosorption of Hexavalent Chromium from Water with Human Hair

Recent Advances in Biomass-Based Waste Materials for the Removal of Chromium (VI) from Wastewater: A Review

Biosorption of Hexavalent Chromium Cr(VI) onto Ziziphus Lotus Fruits Powder: Kinetics, Equilibrium, and Thermodynamics

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