Extraction of Phosphate from Polluted Waters Using Calcium Alginate Beads Doped with Active Carbon Derived from<i>A. aspera</i>Plant as Adsorbent

Ravulapalli, Sujitha; Ravindhranath, K.

doi:10.1155/2017/3610878

Cited by 30 publications

(5 citation statements)

References 32 publications

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“…The adsorbents derived from bio-materials are attracting the attention of the researchers in controlling various dyes. In fact, our research group made some progress in this aspect and found interesting results and they have been reported to the literature (Sujitha & Ravindhranath 2017a, 2017b, 2018bNaga Babu et al 2018).…”

Section: Introductionsupporting

confidence: 54%

Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

Ravulapalli

Ravindhranath

2019

Water Practice and Technology

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Activated carbons were prepared from the stem parts of Achyranthes aspera and Allamanda blanchetii plants and were investigated as adsorbents for the removal of malachite green dye from contaminated water. Various extraction conditions such as pH, initial concentration of dye, adsorbent dosage, temperature, agitation time and presence of co-ions were optimized for the maximum possible extraction of the dye. For analyzing the combined effect of these parameters on the removal efficiency of the adsorbents, statistical optimization modelling was adopted. The adsorbents developed were characterized and the adsorption abilities were observed to be 40.0 mg/g and 53.0 mg/g for the active carbons of Achyranthes aspera and Allamanda blanchetii plants respectively. The mechanism of adsorption was studied using various isotherm models and it was found that the Freundlich model describes well the adsorption process. Thermodynamic studies revealed the endothermic and spontaneous nature of physisorption. The kinetics of adsorption were well defined by the pseudo-second-order model. Desorption and regeneration studies of the spent adsorbents indicated that the percentage of extraction has not come down below 80.0% even after five regenerations for both the adsorbents. The validity of the methods developed are tested with real dye-polluted industrial effluent samples.

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Section: Introductionsupporting

confidence: 54%

Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

Ravulapalli

Ravindhranath

2019

Water Practice and Technology

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“…Of these, adsorption methods are interesting as they are based on easily accessible materials, simple in operation, economical and effective. [13] Active carbons obtained from different bio-materials, [14,15] bone char, [16] natural zeolites, [17] Ca-alginate beads doped with Al 2 O 3 nano flakes and C.urens seeds active carbon, [18] exhausted coffee grounds [19] are some of many adsorbents reported in literature.…”

Section: Introductionmentioning

confidence: 99%

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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“…While entrapment of adsorbents using alginate beads has been extensively investigated for the uptake of various metals (Wang et al 2017), few studies have focused on the uptake of phosphate from solution. Sujitha and Ravindhranath (2017) reported an exceptionally high phosphate adsorption capacity of 133.3 mg=g by calcium alginate beads doped with active carbon derived from the Achyranthes aspera plant. However, activated carbon is expensive to produce and may not be the most viable option.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

Chittoo

Sutherland

2019

J. Environ. Eng.

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Excessive discharge of phosphates in municipal and industrial effluents into water bodies continues to amplify the rate and extent of eutrophication that is impairing aquatic ecosystems throughout the world. Consequently, research into technologies to combat the problem of eutrophication continues unabated. This study aimed to develop a protocol to encapsulate dewatered lime-iron sludge in calcium alginate beads and assess and optimize its phosphate adsorption performance. Response surface methodology (RSM) and artificial neural network (ANN) were used to optimize the encapsulation process through parameter variation. RSM was superior in capturing the nonlinear behavior of the process. Numerical optimization in RSM revealed that maximum adsorption could be obtained from beads prepared using 0.25 g sodium alginate and 0.5 g lime-iron sludge in 25 mL of distilled water to produce a homogeneous mixture and added dropwise into a solution of 0.31 g CaCl 2 in 25 mL of distilled water. The accuracy of the RSM prediction was subsequently validated by laboratory experiments that revealed a residual error of 2.9% and thus highlights the applicability of the model. Batch experiments were conducted and modeled to expound the mechanisms of adsorption. Kinetic data were best simulated using the pseudo-second order model while equilibrium data followed the Langmuir isotherm at room temperature and the Sips isotherm at higher temperatures. Physisorption, hydrogen bonding, dipole interaction, and ligand exchange were the dominant attachment mechanisms while film and intraparticle diffusion were the pertinent transport mechanisms. The beads exhibited a maximum monolayer adsorption capacity of 8.3 mg=g that compared well to other phosphate-targeting adsorbents reported in the literature.

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Extraction of Phosphate from Polluted Waters Using Calcium Alginate Beads Doped with Active Carbon Derived fromA. asperaPlant as Adsorbent

Cited by 30 publications

References 32 publications

Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

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

Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

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Extraction of Phosphate from Polluted Waters Using Calcium Alginate Beads Doped with Active Carbon Derived fromA. asperaPlant as Adsorbent

Cited by 30 publications

References 32 publications

Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

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

Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

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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