Zirconium-Treated Fine Red Mud Impregnated in Zn-Alginate Beads as Adsorbent in Removal of Phosphate from Water

Mohan, G. Krishna; Babu, A. Naga; Kalpana, K.; Ravindhranath, K.

doi:10.14233/ajchem.2017.20864

Cited by 11 publications

(2 citation statements)

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“…The rate of sorption aspects of the Al(III) and F − sorption on to the red‐weed biochar is established through kinetic modeling by analyzing the sorption data with various empirical rate equations such as Bangham's pore diffusion model (Krishna Mohan, Naga Babu, Kalpana, & Ravindhranath, ), Elovich model (Wu, Tseng, & Juang, & Ruey‐Shin., ), pseudo‐second order (Ho & McKay, ), and pseudo‐first order (Corbett, ) as follows:…”

Section: Resultsmentioning

confidence: 99%

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Babu

Reddy

Govindarajan

et al. 2020

Water Environment Research

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The present work proposes the synthesis of robust biochar from Gracilaria Rhodophyta red weeds for sequential removal of Al(III) and fluoride from wastewater. The sorption experiments have been modeled by preliminary optimization of operational parameters using 2 4 factorial statistical modeling. The model has estimated an optimum sequential synergetic removal of 44.5 mg/g of Al(III) and 2.1 mg/g of fluoride onto the biochar. FESEM, BET, XRD, EDX, and FTIR established the potentiality of biochar toward synergetic sorption of Al(III) and fluoride. The thermodynamic analysis projected that the adsorption is physisorption in nature. The adsorption of Al(III) and fluoride follows the Langmuir and Freundlich isotherm models, respectively, and the kinetic analysis established the pseudo-second-order deposition of Al(III) and fluoride ions. The synthesized adsorbent is regenerative enough and could achieve synergetic removal of Al(III) and fluoride ions from industrial-and groundwater-contaminated water bodies. © 2019 Water Environment Federation • Practitioner points• Biochar from seaweeds is explored in the sequential removal of Al(III) and F − ions. • Statistical model is developed for % adsorption and tested for reliability by ANOVA. • GRBC sorbed 44.5 and 2.1 mg/g of Al(III) and F − ions, respectively, at optimum levels. • FESEM, EDX, XRD, and FTIR characterization confirm the potentiality of the GRBC. • GRBC sorbed ⃞90% of Al(III) and F − ions from wastewater and is regenerative.

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Section: Resultsmentioning

confidence: 99%

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Babu

Reddy

Govindarajan

et al. 2020

Water Environment Research

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“…Red mud coagulant is used to remove lead ions at pH 7, and its sorption ability is reported as 98.695 mg/g [ 22 ]. Zirconium-treated fine red mud impregnated in Zn-alginate beads (ZRMAB) is investigated for their adsorption nature towards phosphate from water, and its sorption ability for phosphates is found to be 13.64 mg/g of the adsorbent [ 23 ]. Organically modified magnesium silicate nanocomposites are also used for the removal of lead ions from water [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Removal of Lead from Water Using Calcium Alginate Beads Doped with Hydrazine Sulphate-Activated Red Mud as Adsorbent

Babu

Mohan

Kalpana

et al. 2017

Journal of Analytical Methods in Chemistry

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Calcium alginate beads doped with hydrazine sulphate-treated red mud are investigated as adsorbent for extracting lead ions from water using batch methods of extraction. Different extraction conditions are optimised for maximum lead extraction. Substantial amount of lead is removed, and the adsorption ability is found to be 138.6 mg/g. Surface characterization using FTIR, EDX, and FESEM confirms that lead is “onto” the surface of the adsorbent. Thermodynamic parameters, adsorption isotherms, and kinetics of adsorption are analysed. Adsorption is “physisorption” in nature and spontaneous. The adsorbent developed can be regenerated using 0.1 M HCl. Thus regenerated adsorbent can be used as the adsorbent for further removal of lead at least 10 times, and this enables the complete removal of lead from water by repetitive use of the regenerated adsorbent. The beads facilitate the easy filtration. The methodology developed is successfully applied for removing lead from industrial waste waters.

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De‐fluoridation of Polluted Water Using Aluminium Alginate Beads Doped with Green Synthesized ‘Nano SiO₂+Nano CeO₂‐ZrO₂’, as an Effective Adsorbent

2020

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Nanoparticles of SiO2 and ‘CeO2‐ZrO2’ are synthesized by adopting new green methods based on the classical method of homogeneous precipitation and using the extract of skins of Sapindus plant seeds as capping and/or stabilizing agent. Nano SiO2 is synthesized from red mud, a waste material obtained after extraction of aluminium from Bauxite ore. Nano SiO2, composites of ‘nSiO2+nCeO2‐ZrO2’ and Al‐alginate beads doped with ‘nSiO2+nCeO2‐ZrO2’ are investigated as adsorbents for de‐fluoridation. These three adsorbents are characterized by XRD, FTIR, FESEM and EDX. Various adsorption parameters, namely pH, adsorbent dosage, initial fluoride concentration, time of contact and temperature are optimized for maximum removal of fluoride ions. The adsorption capacities of adsorbents are 66.93 mg/g for nSiO2, 83.84 mg/g for composites of ‘nSiO2+nCeO2‐ZrO2’ and 109.4 mg/g for ‘nSiO2+nCeO2‐ZrO2/AlAL’ (beads). The cumulative affinity of fluoride towards SiO2, CeO2, ZrO2 and Al3+ has been investigated in this work in developing successful adsorbents with high adsorption capacities for de‐fluoridation. The adsorption nature is analysed with various kinetic, isotherm and thermodynamic studies. The adsorption is spontaneous and endothermic in nature. The surfaces of adsorbents are heterogeneous and Freundlich model explains well the sorption process. A sort of complex formation occurs between the adsorbents and fluoride ions. The adsorption follows pseudo‐second order kinetic model. The spent adsorbents can be regenerated and reused with marginal reduction in their adsorption capacities. The methodology developed is successfully applied to treating ground water samples of Prakasam and Guntur Districts, Andhra Pradesh, India.

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Zirconium-Treated Fine Red Mud Impregnated in Zn-Alginate Beads as Adsorbent in Removal of Phosphate from Water

Cited by 11 publications

References 20 publications

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Removal of Lead from Water Using Calcium Alginate Beads Doped with Hydrazine Sulphate-Activated Red Mud as Adsorbent

De‐fluoridation of Polluted Water Using Aluminium Alginate Beads Doped with Green Synthesized ‘Nano SiO₂+Nano CeO₂‐ZrO₂’, as an Effective Adsorbent

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Zirconium-Treated Fine Red Mud Impregnated in Zn-Alginate Beads as Adsorbent in Removal of Phosphate from Water

Cited by 11 publications

References 20 publications

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Sequential synergetic sorption analysis of Gracilaria Rhodophyta biochar toward aluminum and fluoride: A statistical optimization approach

Removal of Lead from Water Using Calcium Alginate Beads Doped with Hydrazine Sulphate-Activated Red Mud as Adsorbent

De‐fluoridation of Polluted Water Using Aluminium Alginate Beads Doped with Green Synthesized ‘Nano SiO2+Nano CeO2‐ZrO2’, as an Effective Adsorbent

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De‐fluoridation of Polluted Water Using Aluminium Alginate Beads Doped with Green Synthesized ‘Nano SiO₂+Nano CeO₂‐ZrO₂’, as an Effective Adsorbent