Removal of Arsenic (V) from Aqueous Solutions Using Chitosan–Red Scoria and Chitosan–Pumice Blends

Asere, Tsegaye Girma; Mincke, Stein; Clercq, Jeriffa De; Verbeken, Kim; Tessema, Dejene A.; Fufa, Fekadu; Stevens, Christian V.; Laing, Gijs Du

doi:10.3390/ijerph14080895

Cited by 30 publications

(15 citation statements)

References 77 publications

(84 reference statements)

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“…In another study, banana pseudostem was used as an adsorbent for removal of Pb(II) from aqueous solution and adsorbent dose of 1 g/l was found to be optimal dose for the removal of Pb nitrate (Bagali et al 2017). Asere et al reported maximum adsorbent dose for As removal was 8 g/l (Asere et al 2017). Sumathi et al found that 1.2 g/100 ml of adsorbent dose was optimum for As removal (Sumathi and Alagumuthu 2014).…”

Section: Effect Of Adsorbent Dosementioning

confidence: 99%

Adsorptive removal of lead and arsenic from aqueous solution using soya bean as a novel biosorbent: equilibrium isotherm and thermal stability studies

et al. 2018

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In this study, adsorption potential of soya bean adsorbent for lead (Pb) and arsenic (As) has been assessed in order to consider its suitability for purification of wastewater containing heavy metals. The main focus of study was on Pb and As. Batch experiments were performed to study the adsorption of Pb and As on soya bean absorbent. The effect of various experimental parameters (adsorbent dose, contact time, temperature and pH) was studied, and optimal conditions were determined. The effect of adsorbent dose on the biosorption of Pb and As from aqueous solution was studied at 37 °C by varying the adsorbent amount from 1 g/100 ml to 4 g/100 ml. Highest amount of Pb and As was adsorbed at sorbent amount of 3 g/100 ml. The optimum pH for removal of As and Pb was found to be 2.0 and 4.0 ± 0.26. Maximum biosorption of Pb and As was achieved at 37 °C. The maximum percentage removal of Pb and As was attained at 60 min of shaking time. Langmuir and Freundlich isotherm models were utilized for equilibrium studies. It was found that biosorption by soya bean adsorbent was exothermic in nature. The thermal degradation analysis suggested that the degradation occurs in two steps and adsorbent is thermally stable.Keywords Biosorption · Soya bean adsorbent · Lead and arsenic · Sorption isotherm and thermal analysis of biosorbent

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Section: Effect Of Adsorbent Dosementioning

confidence: 99%

Adsorptive removal of lead and arsenic from aqueous solution using soya bean as a novel biosorbent: equilibrium isotherm and thermal stability studies

et al. 2018

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“…[ 28 , 29 ]. Although several studies have been conducted on the application of volcanic rocks for pollutants-laden wastewaters [ 28 , 29 , 30 , 31 ], very little research has been directed to the defluoridation of groundwater using volcanic rocks.…”

Section: Introductionmentioning

confidence: 99%

Volcanic Rock Materials for Defluoridation of Water in Fixed-Bed Column Systems

2021

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Consumption of drinking water with a high concentration of fluoride (>1.5 mg/L) causes detrimental health problems and is a challenging issue in various regions around the globe. In this study, a continuous fixed-bed column adsorption system was employed for defluoridation of water using volcanic rocks, virgin pumice (VPum) and virgin scoria (VSco), as adsorbents. The XRD, SEM, FTIR, BET, XRF, ICP-OES, and pH Point of Zero Charges (pHPZC) analysis were performed for both adsorbents to elucidate the adsorption mechanisms and the suitability for fluoride removal. The effects of particle size of adsorbents, solution pH, and flow rate on the adsorption performance of the column were assessed at room temperature, constant initial concentration, and bed depth. The maximum removal capacity of 110 mg/kg for VPum and 22 mg/kg for VSco were achieved at particle sizes of 0.075–0.425 mm and <0.075 mm, respectively, at a low solution pH (2.00) and flow rate (1.25 mL/min). The fluoride breakthrough occurred late and the treated water volume was higher at a low pH and flow rate for both adsorbents. The Thomas and Adams–Bohart models were utilized and fitted well with the experimental kinetic data and the entire breakthrough curves for both adsorbents. Overall, the results revealed that the developed column is effective in handling water containing excess fluoride. Additional testing of the adsorbents including regeneration options is, however, required to confirm that the defluoridation of groundwater employing volcanic rocks is a safe and sustainable method.

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“…Pumice is among the most promising volcanic rocks studied as low-cost adsorbents mainly for heavy metals. [27][28][29][30][31] It has a more comprehensive global distribution in areas with young volcanic fields, including the East Africa countries such as Ethiopia, Eritrea, Kenya, and Tanzania. 32 The Ethiopia Rift, which covers around 30% of the area of the country, is rich in pumice.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Phosphate From Wastewater Using Ethiopian Rift Pumice: Batch Experiment

Fetene

Addis

2020

Air, Soil and Water Research

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Phosphorous from municipal and industrial wastewater is the main cause of eutrophication of rivers and lakes, because effluent quality from conventional secondary wastewater treatment plants does not meet the discharge standard that demands further treatment. Therefore, we investigated pumice as a potential low-cost adsorbent for the tertiary treatment of phosphate from municipal wastewater. The phosphate adsorption process reached equilibrium after 60 minutes contact time and achieved a removal efficiency of 94.4% ± 0.7% for an adsorbent dose of 10 g/L in 3 mg/L phosphate solution. The highest phosphate removal was recorded at pH 7. The experimental data best fitted with the Redlich-Peterson isotherm and the pseudo-second-order kinetic models. The coexisting anions decreased phosphate adsorption in the order of mixture >SO42– > HCO3− > NO3− > Cl− > CO3−. Pumice removed 95% ± 0.2% of phosphate from effluents of the secondary treatment unit of a municipal wastewater treatment plant. Furthermore, effective regeneration of saturated pumice was possible with a 0.2 M NaOH solution. Therefore, pumice could be a technically workable low-cost reusable adsorbent for phosphate removal from wastewater as a tertiary treatment to curb eutrophication of surface waters. However, further column adsorption study is recommended for a continuous flow system to optimize process design variables and scale up for field applications.

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Removal of Arsenic (V) from Aqueous Solutions Using Chitosan–Red Scoria and Chitosan–Pumice Blends

Cited by 30 publications

References 77 publications

Adsorptive removal of lead and arsenic from aqueous solution using soya bean as a novel biosorbent: equilibrium isotherm and thermal stability studies

Adsorptive removal of lead and arsenic from aqueous solution using soya bean as a novel biosorbent: equilibrium isotherm and thermal stability studies

Volcanic Rock Materials for Defluoridation of Water in Fixed-Bed Column Systems

Adsorptive Removal of Phosphate From Wastewater Using Ethiopian Rift Pumice: Batch Experiment

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