Extraction of Fluoride from Polluted Waters Using Low-cost Active Carbon Derived from Stems of Acalypha indica Plant

Suneetha, M.; Sundar, B. Syama; Ravindhranath, K.

doi:10.3233/ajw-150005

Cited by 19 publications

(11 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The positive values of ΔH indicate endothermic nature of adsorption process [31] . The similar nature has been reported in literature while studying sugar‐cane bagasse pith, [32] acid activated carbon, [33] stems of Abutilon indicum, [34] barks of Vitex negundo, [14] stems of Acalypha Indica, [35] and stems of Senna Occidentalis [36] carbons as adsorbents for fluoride removal.…”

Section: Resultssupporting

confidence: 77%

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

2020

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 77%

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

2020

View full text Add to dashboard Cite

show abstract

“…But only a limited number of active sites are available and hence, % removal decreases as the concentration is increased. A similar trend was observed in the literature (Suneetha et al 2015a).…”

Section: Initial Concentration Of Cu 2þsupporting

confidence: 91%

“…These are important findings because this study facilitates the application of FLSP, APSP and PSP adsorbents for treating a variety of effluents with varied pHs 2 to 10. pH PZC values for the three adsorbents were evaluated and found to be: 5.0 for FESP; 6.0 for APSP and 7.0 for PSP (Figure 2). At these pHs, the said adsorbents' surfaces are neutral and above these values, the surfaces are negatively charged due to dissociation of functional groups and at lower pHs, the surface of the adsorbents is positively charged due to protonation (Suneetha et al 2015a;Krishna Mohan et al 2019). The speciation of Cu(II) ions are: Cu 2þ -below pH:3; Cu(OH) þ -between 3 and 6; Cu(OH) 2 -between 6 to 11; and [Cu(OH) 3 ] À and [Cu(OH) 4 ] 2À -above 11 (Cuppett et al 2006;Cotton et al 2007).…”

Section: Solution Ph Effectmentioning

confidence: 99%

Effective removal of Cu2+ ions from polluted water using new bio-adsorbents

Reddy

Pala

Biftu

et al. 2021

Water Practice and Technology

Self Cite

View full text Add to dashboard Cite

Sorbents derived from stem powders of Feronia limonia (FLSP), Amorphophallus paeoniifolius (APSP) and Pumpkin (Cucurbitapepo) (PSP) plants are investigated for the removal of Cu2+ ions from polluted water by adopting batch methods of extraction. Extraction conditions are optimized for the effective removal of Cu2+ ions. High sorption capacities are observed: 175.5 mg/g for FLSP; 140.4 mg/g for APSP; 130.0 mg/g for PSP. Effective pH ranges are: 5 to 10 for FLSP; 6 to 10 for APSP and 7 to 10 for PSP. The three spent adsorbents can be regenerated and used. Thermodynamic parameters indicate that the adsorption process is spontaneous, endothermic and have positive change in entropy values. As ΔH values are more than 25.0 kJ/mole, the adsorption may be due to surface complex formation between Cu2+ ions and functional groups of the adsorbents viz., -OH, -COOH etc in the effective pH ranges. The good adsorption behaviour of FLSP even in acidic pHs may be due to the ion-exchange of Cu2+ ions for H+ ions of the functional groups of the adsorbent. The Langmuir adsorption isotherm and pseudo second-order model describe well the adsorption process. The sorbents are effectively applied to treat effluents from Cu-based industries and polluted lake water.

show abstract

“…Several research groups investigated various unconventional bioadsorbents derived from plant materials for the removal of diverse pollutants and successful methodologies are reported to literature for fluoride [22][23][24][25][26][27], chromium(VI) [28][29][30], zinc(II) [31], ammonia [32,33], aluminum(III) [34,35], nitrite [36,37], phosphate [38] and dyes [20,[39][40][41].…”

mentioning

confidence: 99%

Effective Adsorbents Based on Biomaterials for Removal of Methylene Blue Dye from Water

et al. 2019

Self Cite

View full text Add to dashboard Cite

Biomaterials prepared from barks of Ficus benghalensis, Tamarindus indica and Acasia nilotica indica are investigated as adsorbents for the removal of methylene blue dye from waste waters using batch methods of extraction. Various physico-chemical parameters are optimized for the maximum removal of the dye. The extractions are found to be pH sensitive. Substantial adsorption is noted at high pHs. With simulated waters, 100 % removal of the dye is observed at pH 8/10 and at other optimum conditions of extraction with all the adsorbents developed. The optimum time needed for the maximum extraction of the dye is found to be in the order: Ficus benghalensis (120 min) > Tamarindus indica (90 min) > Acasia nilotica indica (30 min). The adsorption capacities of Ficus benghalensis sorbent, Tamarindus indica sorbent and Acasia nilotica indica sorbent are 50.0 mg/g, 66.7 mg/g and 100 mg/g respectively. In case of the Acasia nilotica indica sorbent, even at low pHs, substantial removal of the dye is effected. Co-anions (five fold excess) are least interfered while cations like, Ca2+, Mg2+ and Cu2+ have interfered to some extent but in no case, % removal has not come down below 90 %. It is interesting to note that Fe2+ and Zn2+ have maintained the maximum extraction synergistically. The developed procedures were successfully applied to real water samples too.

show abstract

Extraction of Fluoride from Polluted Waters Using Low-cost Active Carbon Derived from Stems of Acalypha indica Plant

Cited by 19 publications

References 81 publications

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

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

Effective removal of Cu2+ ions from polluted water using new bio-adsorbents

Effective Adsorbents Based on Biomaterials for Removal of Methylene Blue Dye from Water

Contact Info

Product

Resources

About

Extraction of Fluoride from Polluted Waters Using Low-cost Active Carbon Derived from Stems of Acalypha indica Plant

Cited by 19 publications

References 81 publications

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

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

Effective removal of Cu2+ ions from polluted water using new bio-adsorbents

Effective Adsorbents Based on Biomaterials for Removal of Methylene Blue Dye from Water

Contact Info

Product

Resources

About

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

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