Biosorption of hexavalent chromium from aqueous solutions by Macadamia nutshell powder

Pakade, Vusumzi Emmanuel; Ntuli, Themba D.; Ofomaja, Augustine E.

doi:10.1007/s13201-016-0412-5

Cited by 55 publications

(42 citation statements)

References 53 publications

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“…Further, these materials are regarded as cheap because they require minimum processing. However, when used as adsorbents, some shortfalls like poor surface areas and low adsorption capacities are experienced probably because of the highly cross-linked polymeric nature of the said materials [ 1 , 4 , 9 ]. In addition, upon being used as adsorbents, there is a tendency of small organic molecules trapped within the polymeric cross-linked chains being released into the environments causing high biological oxygen demand and chemical oxygen demand [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Greater separation of components is achieved much faster and conveniently with chemical pretreatment methods than biological methods [ 5 ]. Depending on the intended use of the biomass and the properties desired, various chemical agents, H 2 O 2 [ 7 ], ozone [ 12 ], H 3 PO 4 [ 13 ], HNO 3 [ 14 ], NaOH [ 4 ], and so on, have been reconnoitred for either hydrolysis, oxidation, or delignification [ 5 ]. Oxidative chemical treatment could lead to increased oxygenated functionalities like COOH, C–O–C, CO, and OH which may then increase metal ion complexation, ion exchange, and chelation [ 5 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-GraftedMacadamiaNutshell Powder

Maremeni

Modise

Mtunzi

et al. 2018

Bioinorganic Chemistry and Applications

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Macadamia nutshell powder oxidized by hydrogen peroxide solutions (MHP) was functionalized by immobilizing 1,5′-diphenylcarbazide (DPC) on its surface. The effectiveness of grafting was confirmed by the Fourier transform infrared spectrum due to the presence of NH and C=C stretches at 3361, 1591, and 1486 cm−1, respectively, on the grafted material which were absent in the nongrafted material. Thermogravimetric analysis revealed that the presence of DPC on the surface of Macadamia shells lowered the thermal stability from 300°C to about 180°C owing to the volatile nature of DPC. Surface roughness as a result of grafting was appreciated on the scanning electron microscopy images. Parameters influencing the adsorptive removal of Cr(VI) were examined and found to be optimal at pH 2, 120 min, 150 mg/L, and 2.5 g/L. Grafting MHP with DPC leads to an increase in the Langmuir monolayer capacity from 37.74 to 72.12 mg/g. Grafting MHP with DPC produced adsorbent with improved removal efficiency for Cr(VI).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-GraftedMacadamiaNutshell Powder

Maremeni

Modise

Mtunzi

et al. 2018

Bioinorganic Chemistry and Applications

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“…62,65,67,68,70,72 Recent literature has revealed that new or alternative adsorbents for the removal of Cr(VI) are experimented. 35,63,116 The limitation of biomaterials is the poor surface area, and as such, they are rarely used as scaffolds for preparing composite adsorbents of the type adsorbent1@adsorben-t2@adsorbent3 format. New literature on this eld mainly focuses on cross-linking coupled graing.…”

Section: àmentioning

confidence: 99%

Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

2019

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“…Some of them include tamarind hull, rice straw, sawdust, rice husk, sunflower stem, sea-weed, wood, tea-waste, maize-corn cob, sugarcane bagasse, blue algae, Bael fruit, Macadamia nutshell, Cranberry kernel shell, rosehip seed shells, banana peel, etc. (Chojnacka et al 2005;Anandkumar and Mandal 2009;Zahra et al 2013;Pakade et al 2017;Parlayici and Pehlivan 2019). The quest for the use of biosorbents with possibly higher adsorption potentials is necessary and ongoing.…”

Section: Introductionmentioning

confidence: 99%

Sequestered capture and desorption of hexavalent chromium from solution and textile wastewater onto low cost Heinsia crinita seed coat biomass

2019

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Due to the high cost associated with the treatment of effluents containing heavy metals in the environment, the continuous untreated release of effluent containing chromium from textile industries has resulted in several adverse effects to plants, ecological systems and humans. This research therefore focused on the use of a low cost, biodegradable Heinsia crinita seed coat (HCSC) material for the biosorption of chromium(VI) from aqueous and textile contaminated effluent. The biosorbent was characterized for specific surface area, surface morphology, pH point of zero charge and surface functional groups. Operational variables influences such as biosorbent dose, pH, temperature, initial Cr(VI) ion concentration and contact time on biosorption process was tested. The optimum biosorption parameter was obtained at pH 2.0, adsorbent dosage 0.25 g and contact time of 30 min. From sorption analysis, the pseudo-second-order model best described the attenuation kinetics. Concerning biosorption equilibrium, the results suggested that the adsorption isotherm obeyed the Freundlich model. Langmuir maximum monolayer biosorption capacity of 231.7 mg/g was higher than most biosorbents for Cr(VI) ion. The thermodynamic data showed a physical, spontaneous and endothermic biosorption process. HCSC showed high percentage desorption > 90% using 0.1 M HNO 3 and was efficient after three cycles of regeneration studies. The results showed HCSC biomass as a suitable candidate for abstraction of Cr(VI) ion from contaminated solution and textile effluent.

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Biosorption of hexavalent chromium from aqueous solutions by Macadamia nutshell powder

Cited by 55 publications

References 53 publications

Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-GraftedMacadamiaNutshell Powder

Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-GraftedMacadamiaNutshell Powder

Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

Sequestered capture and desorption of hexavalent chromium from solution and textile wastewater onto low cost Heinsia crinita seed coat biomass

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