An experimental and quantum chemical study of removal of utmostly quantified heavy metals in wastewater using coconut husk: A novel approach to mechanism

Polyvinylpyrrolidone Oxime (PVPO) was synthesized and studied for mild steel (MS) corrosion inhibition in 1 M H2SO4, at different concentrations and temperatures. The corrosion inhibition efficiency was studied using weight loss method, polarization technique, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and quantum chemical calculations. The results from weight loss, potentiodynamic polarization and EIS showed that the inhibition efficiency (I. E.) increased with gradual increments in the inhibitor concentration, and decreased at higher temperatures. The polarization study also revealed that PVPO acted as a mixed type inhibitor, and Langmuir adsorption isotherm fitted well for the adsorption behavior. The highest corrosion efficiency was found to be 88.39%, with a concentration of 1000 ppm, and a temperature of 303 K. The corrosion inhibition mechanism has been further proposed, including the support from the theoretical study. SEM images also verified the MS surface smoothening in PVPO presence, and, hence, it has shown to be a good corrosion inhibitor.

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“…The decrease in I.E. % (η) value may be due to PVPO desorption initiation [23][24] from the MS surface, at higher temperatures.…”

Section: Weight Loss Measurements Effect Of Concentration and Temperamentioning

confidence: 98%

Exploring the Capability of Synthesized PVP-Oxime for Corrosion Inhibition of a Mild Steel Surface in a 1 M H2SO4 Solution

Saini¹,

Kumar²,

Pahuja³

et al. 2020

Port. Electrochim. Acta

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“…Applications in environmental engineering. Recently, several studies have been conducted applying different parts of coconut in water treatment in order to remove dyes (Collivignarelli et al, 2019d), heavy metals (Malik et al, 2017), pharmaceuticals and personal care products (Yanyan et al, 2018) and other pollutants (Kaman et al, 2017). The main application is the use of coconut as a bio-sorbent after an activation process (Burakov et al, 2018).…”

Section: Residue Performancementioning

confidence: 99%

“…They found that the CSAC exhibited good yields for chemical oxygen demand (COD), total suspended solids (TSS) and colour removal (70%). Furthermore, applications of CSAC on WW rich in heavy metals are also possible (Jin et al, 2013;Malik et al, 2017). Generally, high concentrations of heavy metals represent a problem when industrial WW or aqueous waste must be treated (Collivignarelli et al, 2019f).…”

Section: Residue Performancementioning

confidence: 99%

Valorization of agro-industry residues in the building and environmental sector: A review

et al. 2020

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Environmental pollution has become a relevant issue as the population rises and resources decrease. Reuse and recycling still have the greatest potential as they turn the waste into a new resource, representing the ‘closed-loop’ step of a circular economy (CE). Looking for new applications for agro-industry waste represents both an environmental issue, as its incorrect disposal is a cause of pollution, and a chance to exploit zero-cost natural wastes. The present review, with around 200 articles examined, focuses on possible reuses of these residues in (a) building construction, as additives to produce thermal and acoustic insulation panels, and (b) in water treatments, exploited for removal of pollutants. The selected materials (coconut, coffee, corn, cotton and rice) have industry production wastes with suitable applications in both sectors and huge worldwide availability; their reuse may thus represent a new resource, with an impact based on the production rate and the possible replacement of current inorganic materials. Along with possible implementation of the selected materials in the building industry and environmental engineering, a brief description of the production and supply chain are provided.

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“…The use of waste materials is attractive because it helps in reducing the cost of waste disposal and minimizing the waste. These agricultural wastes include the shells and/or stones of fruits like coconut [11][12][13], peanuts [14], walnut [15], cashew [16,17 ]; fruit peels of orange [18,19], pomelo [20],citrus [21], banana [22]; rice husk [23][24][25]; and sugar cane bagasse [26]. These agricultural waste as adsorbents have been explored in SPE as low-cost nanometersized materials [27,28].…”

Section: Nano-chamomile Waste As a Low-cost Biosorbent For Rapid Remomentioning

confidence: 99%

Nano-chamomile waste as a low-cost biosorbent for rapid removal of heavy metal ions from natural water samples

2019

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I N this study, we report the feasibility of using nano chamomile waste (NCW) as a selective solid phase extractor for heavy metal ions. The experimental parameters including pH (1.0-6.0), metal ion concentration (10-100 µmole), adsorbent dose (10-1000 mg), and biosorption time (0.5-90 min) were altered by using the batch technique to optimize the maximum capacity of this new biosorbent. The experimental data by NCW agreed with both Freundlich and Langmuir models (R 2 =0.999) with maximum uptake capacities of 621.6 mgg-1 (3 mmolg-1) for Pb (II), 163.9 mgg-1 (2.58 mmolg-1) for Cu (II), and 522.7 mgg-1 (9.36 mmolg-1) for Fe (III). In addition, the values of metal uptake as a function of time agreed with the kinetic pseudosecond-order model. The kinetic experiments confirmed the fast accessibility of metal ions to the biosorbent surface resulting in equilibrium within 30 s. NCW was also characterized using FT-IR spectra and the crystallinity of the biosorbent was characterized using X-ray diffraction (XRD). The morphological characterization and particle size of NCW were obtained using SEM and TEM, respectively. Our method was investigated to measure Pb (II), Cu (II), and Fe (III) with a certain spiked amounts in natural water samples such as groundwater (GW), drinking tap water (DTW), natural drinking water (NDW), Nile River water (NRW), seawater (SW), and wastewater (WW). A removal efficiency of ≥98% was obtained for all collected samples using batch experiments and without matrix interferences. Considering its cheap source, simple, economic and fast uptake process, NCW can be used as a low-cost nano biosorbent for the removal of metal ions from natural water samples.

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An experimental and quantum chemical study of removal of utmostly quantified heavy metals in wastewater using coconut husk: A novel approach to mechanism

Cited by 56 publications

References 45 publications

Exploring the Capability of Synthesized PVP-Oxime for Corrosion Inhibition of a Mild Steel Surface in a 1 M H2SO4 Solution

Exploring the Capability of Synthesized PVP-Oxime for Corrosion Inhibition of a Mild Steel Surface in a 1 M H2SO4 Solution

Valorization of agro-industry residues in the building and environmental sector: A review

Nano-chamomile waste as a low-cost biosorbent for rapid removal of heavy metal ions from natural water samples

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