Adsorption of toxic Cr(VI) ions from aqueous solution by sulphuric acid modified Strychnos potatorum seeds in batch and column studies

Anbalagan, K.; Kumar, P. Senthil; Karthikeyan, R.

doi:10.1080/19443994.2015.1049965

Cited by 23 publications

(8 citation statements)

References 69 publications

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“…The clearing nut seeds (Strychnos potatorum) were collected from the Embilipitiya district, Sri Lanka and washed with distilled water to remove dust particles and impurities. After drying the wet plant material under the sunlight, it was ground to reduce the particle size and sieved to obtain 250-500 μm size fraction (average particle size 375 μm) [24]. The obtained clearing nut seed powder (CNSP) was stored in sealed plastic bags to avoid the effects of moisture.…”

Section: Preparation Of Clearing Nut Seed Powdermentioning

confidence: 99%

Adsorptive removal of Co(II) in aqueous solutions using clearing nut seed powder

Ranaweera

Godakumbura

Perera

2020

Heliyon

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The present study assessed the potential use of clearing nut seed powder (Strychnos potatorum) as an adsorbent for the removal of Co(II) ions from aqueous solutions. Based on FTIR analysis, the adsorbent possesses hydroxyl, C-N, and C-O functional groups and SEM analysis indicated the presence of uneven porous surface structure, which is important for adsorption. Batch adsorption studies were performed to investigate the effect of contact time, initial pH, initial Co(II) concentration, adsorbent dosage, and temperature on adsorption. The Langmuir isotherm model provided the best explanation to experimental data with the highest correlation coefficient and the maximum monolayer adsorption capacity obtained was 4.245 mg/g. The pseudo-second-order kinetic model fitted well with the adsorption kinetic data. Sorption thermodynamic data showed that the adsorption process is spontaneous and exothermic in nature. The clearing nut seed powder obtained after surface modification by acid treatment showed a higher adsorption capacity.

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Section: Preparation Of Clearing Nut Seed Powdermentioning

confidence: 99%

Adsorptive removal of Co(II) in aqueous solutions using clearing nut seed powder

Ranaweera

Godakumbura

Perera

2020

Heliyon

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“…Experimental results show that the adsorption of Cr( vi ) ions in aqueous solution and wastewater is reduced at high pH. 60 The adsorption of Cr( vi ) ions in aqueous solution and wastewater reached a maximum in pH 2. 61 …”

Section: Resultsmentioning

confidence: 96%

“…Experimental results show that the adsorption of Cr(VI) ions in aqueous solution and wastewater is reduced at high pH. 60 The adsorption of Cr(VI) ions in aqueous solution and wastewater reached a maximum in pH 2. 61 It can be seen that the adsorption mechanism of Cr(VI) ions on the adsorbent (Si-CPTS-AHAP) is based on chelation and the donor nitrogens and OH groups are coordinated to the chemisorbed heavy metal ions on the surface.…”

Section: Adsorption Studiesmentioning

confidence: 96%

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Removal of chromium(vi) from polluted wastewater by chemical modification of silica gel with 4-acetyl-3-hydroxyaniline

Bilgiç

Cimen

2019

RSC Adv.

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“…The major sources of environmental pollution are due to excess amount of metal ions released from industries such as textile, leather, electroplating, galvanizing, dyes, pigments mining, metal finishing, metal processing industries [2]. Lead, nickel, chromium, zinc, cadmium and copper are stable carcinogenic heavy metals [3][4][5][6][7][8]. The impact of heavy metal releases in the environment is severe,that has become a thread to human and aquatic life.…”

Section: Introductionmentioning

confidence: 99%

Organo-nanobentonite and organo-nanokaoline for effective removal of Pb(II) ions from battery effluent: characterization, isotherm, kinetic studies

Maheswari¹,

Sivakumar²,

Thirumarimurugan³

2019

DWT

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a b s t r a c tLead is considered as one of the deadliest heavy metals which causes severe impact on the environment. In the present work,the experimental study was carried out by using eco-friendly nano-adsorbent material ONK (organo-nanokaoline) and ONB (organo-nanobentonite) for the effective removal of Pb(II) ions from battery synthetic effluent. The organically modified adsorbents were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray (EDX), thermogravimetric analysis (TGA). Operating parameters such as pH, adsorbent dosage and contact time were experimentally optimized for the maximum removal of ions. The optimum conditions were found to be at pH of 4, a dosage of 4 g/L, 30 min equilibrium time with 400 mg/L initial concentration for ONK. The adsorption data was fitted with isotherm models such as Langmuir and Freundlich. The monolayer adsorption capacity of ONK and ONB for Pb(II) ions was reported to be about 47 mg/g (ONK), 32 mg/g (ONB), respectively. Adsorption kinetics and mechanism were analyzed using pseudo-first order, pseudo-second order, intra particle diffusion model, and Boyd model. The pseudo second order kinetic model provided the best fit for absorption of ions.

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Adsorption of toxic Cr(VI) ions from aqueous solution by sulphuric acid modified Strychnos potatorum seeds in batch and column studies

Cited by 23 publications

References 69 publications

Adsorptive removal of Co(II) in aqueous solutions using clearing nut seed powder

Adsorptive removal of Co(II) in aqueous solutions using clearing nut seed powder

Removal of chromium(vi) from polluted wastewater by chemical modification of silica gel with 4-acetyl-3-hydroxyaniline

Organo-nanobentonite and organo-nanokaoline for effective removal of Pb(II) ions from battery effluent: characterization, isotherm, kinetic studies

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