Defluoridation of waters using low-cost HNO&lt;SUB align="right"&gt;3 activated carbon derived from stems of Senna Occidentalis plant

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

doi:10.1504/ijetm.2015.073079

Cited by 28 publications

(11 citation statements)

References 0 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: 76%

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

2020

Self Cite

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: 76%

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

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…A similar trend was reported in the literature for the adsorbent derived from stems of Senna Occidentalis plant. The maximum percentage removal was 87.3% at 50 min and no noticeable change (steady-state) was observed even after 90 min (87.8%) (Suneetha et al 2015b).…”

Section: Contact Timementioning

confidence: 82%

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

“…Our research group is working on these same outlines and found some successful methods for the removal of various toxic ions using biomaterials as adsorbents [34][35][36][37][38][39][40]. While searching various plant materials for their possible use as adsorbents in the removal of various toxic ions, it is noticed that there is a strong affinity between the seeds powders of Phoenix sylvestris plant and chromium(VI) ions.…”

Section: Introductionmentioning

confidence: 99%

Effective Removal of Hexavalent Chromium from Polluted Water using Phoenix sylvestris Seed Powder as Adsorbent

et al. 2019

View full text Add to dashboard Cite

Phoenix sylvestris seed powder (PSSP) was investigated as an adsorbent for the removal of chromium(VI) ions from water using batch extraction method. The conditions for the maximum extraction were optimized. The adsorption capacity was found to be 22.5 mg/g at pH= 2, contact time: 60 min, PSSP dosage: 0.40 g/500mL, rpm: 300 and temp.: 28 ± 2 ºC and found to be more suitable adsorbant than compared to other reported adsorbents in the literature. Co-ions even in five-fold excess were less interfered. Regeneration studies revealed that Phoenix sylvestris seed powder can be used up to three cycles. The method developed was successfully applied to polluted water/industrial effluents samples.

show abstract

Defluoridation of waters using low-cost HNO<SUB align="right">3 activated carbon derived from stems of Senna Occidentalis plant

Cited by 28 publications

References 0 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 Removal of Hexavalent Chromium from Polluted Water using Phoenix sylvestris Seed Powder as Adsorbent

Contact Info

Product

Resources

About

Defluoridation of waters using low-cost HNO<SUB align="right">3 activated carbon derived from stems of Senna Occidentalis plant

Cited by 28 publications

References 0 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 Removal of Hexavalent Chromium from Polluted Water using Phoenix sylvestris Seed Powder as Adsorbent

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