Removal of lead (II) from wastewater using active carbon of Caryota urens seeds and its embedded calcium alginate beads as adsorbents

Ravulapalli, Sujitha; Ravindhranath, K.

doi:10.1016/j.jece.2018.06.033

Cited by 63 publications

(17 citation statements)

References 55 publications

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“…This fact can be favorable because fewer particles increase the porosity and a better contact between the adsorbent's surface and the adsorbate can occur. This avoids overlapping of adsorption sites due to large adsorbent masses [44]. The biochars obtained are in accordance with the AWWA B604-90 (Standard for granular activated carbon) [52].…”

Section: Biochar Characterizationsupporting

confidence: 70%

“…The weight: volume ratio as the apparent density was determined according to ASTM D2854 -09 (Standard Test Method for Apparent Density of Activated Carbon). An electro vibrator was used with a uniform flow range of 0.75 cm 3 s −1 to 1 cm 3 s −1 , to improve the density results [44].…”

Section: Biochar Characterizationmentioning

confidence: 99%

“…The equilibrium concentration C e was determined. The experimental data were fitted to de Langmuir and Freundlich isotherm models [28,44]. Langmuir model describe the chemical or monolayer adsorption and Freundlich will indicate whether it is a physical or multilayer adsorption.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

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Biochar from Agricultural by-Products for the Removal of Lead and Cadmium from Drinking Water

Puglla

Guaya

Tituana

et al. 2020

Water

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This study reports the adsorption capacity of lead Pb2+ and cadmium Cd2+ of biochar obtained from: peanut shell (BCM), “chonta” pulp (BCH) and corn cob (BZM) calcined at 500, 600 and 700 °C, respectively. The optimal adsorbent dose, pH, maximum adsorption capacity and adsorption kinetics were evaluated. The biochar with the highest Pb2+ and Cd2+ removal capacity is obtained from the peanut shell (BCM) calcined at 565 °C in 45 min. The optimal experimental conditions were: 14 g L−1 (dose of sorbent) and pH between 5 and 7. The sorption experimental data were best fitted to the Freundlich isotherm model. High removal rates were obtained: 95.96% for Pb2+ and 99.05. for Cd2+. The BCH and BZM revealed lower efficiency of Pb2+ and Cd2+ removal than BCM biochar. The results suggest that biochar may be useful for the removal of heavy metals (Pb2+ and Cd2+) from drinking water.

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Section: Biochar Characterizationsupporting

confidence: 70%

Section: Biochar Characterizationmentioning

confidence: 99%

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Biochar from Agricultural by-Products for the Removal of Lead and Cadmium from Drinking Water

Puglla

Guaya

Tituana

et al. 2020

Water

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“…Adsorption studies: Batch extraction systems were adopted in this study [21][22][23]. Stock solution of simulated Cu(II) ions of 100 mg/L concentration was prepared and the solution was suitably diluted as per requirement.…”

Section: Methodsmentioning

confidence: 99%

Effective Activated Carbon as Adsorbent for the Removal of Copper(II) Ions from Wastewater

2019

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Nitric acid activated carbons prepared from the barks of Limonia acidissima plant (NALABC) and stems of Hibiscus cannabinus plant (NAHCSC) are investigated as adsorbents for the removal of Cu(II) ions from waste water using batch methods of extraction. Various extraction conditions namely, pH, time of equilibration, sorbent concentration, initial concentration of Cu(II) ions and temperature, are optimized for the maximum removal. Substantial amounts of Cu(II) are extracted in the pH range: 3 to 9 and adsorption capacities are 19.6 mg/g for NALABC and 29.4 mg/g for NAHCSC, which are more than many active carbons developed in the previous works. It is interesting to note that the adsorbents are effective in acidic, neutral and also in basic conditions of the water samples and thus paving the way for applying these adsorbents in wide pH ranges of diverse samples. Five-fold excess of common co-ions that are normally present in water, have marginally affected the % removal. Thermodynamic parameters are evaluated for the spontaneity and nature of adsorption processes. The adsorption phenomenon is analyzed using Langmuir and Freundlich isotherm models and noted that Langmuir isotherm model suits better indicating the uniform and mono-layer nature of adsorption. Kinetics of adsorption is analyzed and found that pseudo second-order kinetics preferably explains the adsorption of Cu(II). The spent NALABC and NAHCSC can be regenerated and subsequently used. The adsorbents developed are found to be effective in removing Cu(II) ions from the real water samples collected from polluted lakes and copper based industries.

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“…mercury, cadmium, lead, chromium, arsenic, zinc, copper, nickel, cobalt is non-biodegradable and causing organs damage [1][2][3]. Lead is very important elements in body metabolism at limited concentration, but, at over limit concentration it can be toxic and can cause bad effects to many biological and biochemical processes [4][5][6]. The heavy metals which directed to water resources may produce from industrial wastewater such as batteries, refining ores, alloy, electronics and elec-troplating.…”

Section: Introductionmentioning

confidence: 99%

Detection and removing of lead from wastewater using chemical treatment of polyurethane foam waste: Batch and column experiments

Moawed¹,

El-Hagrasy²,

Kamal³

2019

Desalination and Water Treatment

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A new inexpensive sorbent was prepared from the waste of polyurethane foam (PUF) which highly surface polarity and sorption capacity. PUF was modified by adding amino, chloro and hydroxyl groups to its matrix. The polyamine polyhydroxy polyurethane chloride (PPPC) was characterized by using elemental analysis (EA), bulk conductivity (BC,σ), infrared/ultraviolet/visible spectra (IR/UV/Vis), pH point zero charge (pH ZCP), thermal analysis (TGA/DTA/DSC), scanning electron microscope (SEM) and X-ray diffraction (XRD). The PPPC owned improved stability in acidic/alkaline solutions and organic solvents. The pH ZPC of PPPC was 5.1 and the maximum values of ∆pH of PPPC are + 1.5 and-3.8 at pH 3.2 and pH 8.3. The σ of PPPC was 2.6×10-5 Ω-1 m-1. PPPC contains several active groups (NH 2 , Cl, OH, C=O, C=C, and CO -C) which classified as an effective sorbent for the solid-phase extraction (SPE) of Pb(II) ions from wastewater. The removing rate of the Pb(II) ions onto PPPC was very fast with half-life time (t 1/2) 1.13 min at pH range 3-7. The value of ∆Η for the sorption Pb(II) ions were-22.9 kJ/mol; these revealed that the values the extraction process is exothermic in nature. The recovery percentage of Pb(II) ions are 99-105% with relative standard deviation (RSD) 2.49% (n = 7).

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Removal of lead (II) from wastewater using active carbon of Caryota urens seeds and its embedded calcium alginate beads as adsorbents

Cited by 63 publications

References 55 publications

Biochar from Agricultural by-Products for the Removal of Lead and Cadmium from Drinking Water

Biochar from Agricultural by-Products for the Removal of Lead and Cadmium from Drinking Water

Effective Activated Carbon as Adsorbent for the Removal of Copper(II) Ions from Wastewater

Detection and removing of lead from wastewater using chemical treatment of polyurethane foam waste: Batch and column experiments

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