Arsenate adsorption from aqueous solution using iron-loaded Azadirachta indica roots: batch and fixed-bed column study

Sawood, Ghazi Mohd; Gupta, Sanjiv Kumar

doi:10.5004/dwt.2020.26233

Cited by 11 publications

(4 citation statements)

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“…The experimental results were applied to the Yoon and Nelson model, which provided KYN and t50 values that accurately reflected the fixed bed adsorption of arsenic onto the FeAlPBC. Ghazi et al (2021) reported the same findings and concluded that while t50 dropped with flow rate due to quicker column saturation, kYN increased with concentration [15]. The Yoon and Nelson model has been effectively applied in earlier works to describe the adsorption of contaminants in a fixed-bed column design [42,43].…”

Section: Yoon and Nelson Modelmentioning

confidence: 84%

“…One of the most popular and promising methods for developing, enhancing, and optimizing the process parameters and their interactions effects on the process with the fewest possible experiments is response surface methodology (RSM) [14,15]. In order to optimize the process parameters, it is a statistical and mathematical technique with a multivariable nonlinear model.…”

Section: Introductionmentioning

confidence: 99%

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Modified paddy husk carbon with linked fibrils of FeHO₂ using aluminium as surface regulator for enhanced As (III) removal in fixed bed system

Ahmad¹,

Gautam²,

Sawood³

et al. 2023

Preprint

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The As (III) uptake capacity of Fe impregnated AC greatly depends on availability of active surface sites of Iron Oxide, which is determined by the surface area of the anchoring particles. In this context, utilizing Al as a surface regulator, we proposed a process to attach linked fibrils of FeHO₂ with the objective of developing an adsorbent with enhanced As (III) adsorption capacity. The procedure was based on hydrothermal process using paddy husk based AC, and both Iron and aluminium ions in the test hydrolysis solution. By a dynamic approach that would enable an industrial-scale treatment, fixed column adsorption tests were conducted to enhance the generation of cleaner effluents and further study the primary mechanisms involved in the adsorption process. CCD was employed to evaluate the interactions between various operating process variables and their effects on the breakthrough time for optimization of As (III) adsorption process. The exhaust time was observed to rise with increasing dose, falling flow rate, and influent concentration. The CCD optimization result showed that the FeAlPBC was an efficient and cost effective adsorbent with a maximum response of 1681 min, when the independent parameters were retained at 15.0 g FeAlPBC dose, 500 µg/L influent concentrations, 2.0 mL/min flow rate, and a desirability value of 0.986. To further comprehend the primary adsorption mechanisms, the breakthrough curves were predicted by application of the test data in the Thomas, Adam-Bohart, Yoone-Nelson, and Advection diffusion models. The experimental results and Thomas and Advection diffusion models were in good agreement. 0.1 M NaOH solution was used to regenerate the columns. The FeAlPBC samples can be recycled upto four cycles with little to no reduction in adsorption capacity. Also, the TCLP test demonstrated that the used FeAlPBC were inert and could be put into landfills without risk. In conclusion, FeAlPBC is a strong contender for removing As (III) from potable water and has a wide range of potential future applications.

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Section: Yoon and Nelson Modelmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Modified paddy husk carbon with linked fibrils of FeHO₂ using aluminium as surface regulator for enhanced As (III) removal in fixed bed system

Ahmad¹,

Gautam²,

Sawood³

et al. 2023

Preprint

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“…Uptake capacity was also decreased at increased flow rates due to secant As (III) residence time in the fixed bed and solute diffusion into the adsorbent's pores. As a result of leaving the bed before equilibrium has been established, a lesser breakthrough time is obtained (Mohan et al 2017;Sawood & Gupta 2020b). The interaction impact of influent As (III) concentration and bed height on breakthrough time is displayed in Figure 8.…”

Section: Anova and Model Assessmentmentioning

confidence: 99%

Modeling of the As (III) adsorption using Fe impregnated polyethylene terephthalate char matrix: A statistical approach

Sawood¹,

Gautam²,

Mishra³

et al. 2022

Water Science and Technology

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The present research aimed to analyse the impact of economical Fe impregnated PET char (PETC-Fe) for adsorption of As (III) through series of column experiments. For an inlet arsenite concentration of 1,000 μg/L, PETC-Fe exhibits excellent uptake capacity of 1,892 μg/g. CCD (central composite design) in response surface methodology (RSM) was used to evaluate the influence of various process variables on the response function (breakthrough time) for optimization and assessment of interaction effects. The breakthrough time is more responsive to influent As (III) concentration and bed height than inlet flow rate, according to the perturbation plot. Adams–Bohart, Bed Depth Service Time model, and Thomas models were used to model the dynamics of the adsorption system. The BDST model suited the experimental data well in the early part of the breakthrough curve, but there were minor variations over the breakpoints. Despite the fact that the experimental values and the data sets estimated using the Adams–Bohart model followed a similar pattern, they differed slightly. The PETC-Fe was found to be a sustainable and highly economical adsorbent, with a desorption performance of more than 97 percent indicating the adsorbent's reusability. This adsorbent's excellent As (III) uptake capacity and regeneration performance imply that it might be used in industrial/domestic applications, and the information obtained could aid in future scaling up of the adsorption system.

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“…The exit concentration of As(V) solution was periodically collected at the top and assessed using atomic absorption spectrometer. 1)) facilitates to ascertain process parameters like velocity coefficient K th (mLmin -1 .mg -1 ) and the maximum biosorption capacity qth (mg g -1 ) in biosorption bed (41)(42)(43)(44)(45). The linear Thomas equation is…”

Section: Continuous Column As (V) Biosorption Studiesmentioning

confidence: 99%

Domestic Water Filter for Treatment of Arsenic Contaminated Water

Rajeswari¹

2022

ECS Trans.

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The feasibility and efficacy of continuous up flow filter packed with Shelled Moringa Oleifera Seed (SMOS) powder for the evacuation of As(V) from polluted water was explored by varying SMOS dose, initial As(V) intensity, and adsorbate flow rate. The finding from fixed column operations depicted that highest As(V) uptake, breakthrough, and saturation time improved with rise in SMOS dosage and with decline in volumetric flow rate. The highest As (V) uptake attained was 55.41 μg g-1 at 100 μg L-1 As(V) intensity, 6 g of SMOS, and flow rate of 2 mL min-1. The breakthrough curves of As(V) removal were modeled by Thomas model and results depicted that the Thomas model delivers excellent similarity with experimental data. From practical and economic view, the filter packed with SMOS might be exceptionally employed as a sustainable and cost-effective strategy for the evacuation of As(V) in polluted water for rural household applications.

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Arsenate adsorption from aqueous solution using iron-loaded Azadirachta indica roots: batch and fixed-bed column study

Cited by 11 publications

References 0 publications

Modified paddy husk carbon with linked fibrils of FeHO₂ using aluminium as surface regulator for enhanced As (III) removal in fixed bed system

Modified paddy husk carbon with linked fibrils of FeHO₂ using aluminium as surface regulator for enhanced As (III) removal in fixed bed system

Modeling of the As (III) adsorption using Fe impregnated polyethylene terephthalate char matrix: A statistical approach

Domestic Water Filter for Treatment of Arsenic Contaminated Water

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