Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method

Basnet, Prabin; Ojha, Pawan Kumar; Gyawali, Deepak; Ghimire, Kedar Nath; Paudyal, Hari

doi:10.1016/j.heliyon.2022.e10305

Cited by 17 publications

(9 citation statements)

References 61 publications

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“…The change in standard enthalpy (∆H°) and standard entropy (∆S°) were determined as the respective slope and intercept via plotting ln K L against 1/T (Figure 9) using equation (9). These values were substituted into equation (10) at different temperatures to estimate the values of ∆G° (change in standard Gibbs free energy) stated in Table 4. The result suggested adsorption to be spontaneous and exothermic (ΔH° and ∆G° were negative), occur by physisorption (∆G° values range) and possess high degree of disorderliness (∆S° was positive).…”

Section: In Q Qmentioning

confidence: 99%

“…Adsorption was chosen as an effective method for pollutants removal from solution because of its operational simplicity, low cost, high sequestration efficiency and low energy consumption. Studies are now looking into synthesizing effective low cost adsorbents from agricultural bye-products such as chickpea, 4 sugar cane bagasse, 5 rice husk, 6 rice bran, 7 rice straw, 8 biochar, 9 Areca catechu , 10 and so on as against the costly commercial activated carbon being used in the treatment of industrial wastewater. Their potential lies in the active functional groups such as hydroxyl, carbonyl, carboxylic, amino, and alkoxy that are present in them.…”

Section: Introductionmentioning

confidence: 99%

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Taguchi Parametric Optimization and Cost Analysis of Hexavalent Chromium Sequestration From Aqueous Solution by NaOH-Modified Garcinia kola Hull Particles

Popoola

2023

Environ�Health�Insights

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The presence of chromium in industrial wastewater is unavoidable due to its large usage as part of chemical constituents used in many industries. Its removal from wastewater is imperative because it’s toxic in nature. This study investigated the application of NaOH-modified Garcinia kola hull particles (cMGK-HP) for Cr(VI) sequestration from aqueous solution. The optimization of process parameters was executed using Taguchi of Design Expert software for optimum point prediction, analysis of variance, parameters interaction and mathematical model development. A proposed model was used for the adsorption cost analysis. The predicted and experimental percentage of Cr(VI) sequestration were recorded at optimum point to be 99.02% and 98.76% with pH, adsorbent dose, contact time, initial concentration, and temperature of 2, 8 g/L, 20 minutes, 10 mg/L, and 20°C respectively. A correlation coefficient of .9937 between experimental and predicted values of percentage Cr(VI) sequestration affirmed high efficacy of the developed model. ANOVA showed the order of parameter contribution to be pH > adsorbent dose > initial concentration > contact time > temperature. A maximum adsorption capacity of 217.39 mg g−1 was obtained for cMGK-HP. Cost analysis revealed using cMGK-HP to be cost effective for Cr(VI) sequestration with a total operational cost of 0.824 $/mole Cr(VI) ions when compared with commercial activated carbon. Adsorbent characterization revealed the presence of active functional groups enhancing the sequestration process. It could be deduced that cMGK-HP is effective to remove Cr(VI) from solution.

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Section: In Q Qmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Taguchi Parametric Optimization and Cost Analysis of Hexavalent Chromium Sequestration From Aqueous Solution by NaOH-Modified Garcinia kola Hull Particles

Popoola

2023

Environ�Health�Insights

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“…[ 5 ] It is widely utilized in tanneries, metallurgy, electroplating, paints, pigments, preservatives, pulp, and paper industries. [ 6 ] Cr is frequently introduced into the environment through industrial waste. [ 7 ] Cr(VI) compounds, which include chromates of Ca, Zn, Sr, and Pb, are poisonous and carcinogenic.…”

Section: Introductionmentioning

confidence: 99%

In silico analysis of chromium‐reducing OXR genes derived from tannery effluent‐contaminated soil metagenome

Singh,

Patel,

Varma

et al. 2024

CLEAN Soil Air Water

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Tannery effluent waste comprises various potentially toxic metals, including chromium (Cr) with varying acute or chronic toxicity. Cr(VI) is known to be a category‐A carcinogen. Reduction of toxic Cr(VI) to Cr(III), which has lesser bioavailability, is one of the mechanisms used by many microbes to withstand Cr(VI) toxicity in the contaminated effluents. Oxidoreductase (OXRs) reduces toxic Cr(VI) to Cr(III); hence a thorough understanding of the OXRs is important for developing a suitable strategy to minimize Cr(VI) toxicity. Therefore, the OXR‐encoding genes were sequenced using metagenomic DNA shotgun sequencing from the tannery effluent‐contaminated soil. Six OXR‐encoding genes were expressed in Escherichia coli, and OXR activity was confirmed by in situ quantitative assays. The six proteins were subjected to phylogenetic and evolutionary analysis. Further, detailed structural analysis of the two OXRs, namely, OXR3 and OXR8 with lowest and highest activity respectively, were investigated in silico for structural characteristics. The results revealed that both the proteins were soluble FMN‐linked oxidoreductases. Eight conserved active site residues (Pro24, Thr26, Ala59, Tyr139, His178, Tyr180, His219, Tyr221, Arg269, and Lys360) in the enzyme OXR3 were predicted. Similarly, nine conserved active site residues (Pro20, Thr22, Ala55, Glu97, His191, Tyr193, Arg241, Cys334, and Arg335) were predicted in OXR8. The tertiary structure of OXR8 was an aldolase TIM barrel structure, like Thermus scotoductus chromate reductase. Docking with FMN revealed the involvement of all the nine predicted active site residues in FMN binding with Pro20, Thr22, and Cys334 as the most important ones.

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“…Conventional technologies have been developed for the treatment of Cr(Ⅵ)-containing wastewater, including precipitation (Basnet et al, 2022), ion exchange (Hammood et al, 2020), adsorption (Liu et al, 2022), membrane filtration (Zhang et al, 2022), and photocatalysis (Wu et al, 2018). However, the applications of most technologies are limited by their high energy consumption, high cost, and serious secondary pollution (Xu et al, 2019).…”

mentioning

confidence: 99%

Overexpression of the sulfate transporter‐encoding SULTR2 increases chromium accumulation in Chlamydomonas reinhardtii

Tang

Zhang

et al. 2023

Biotech & Bioengineering

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Hexavalent chromium [Cr(Ⅵ)] is a highly toxic contaminant in aquatic systems, and microalgae represent promising bioremediators of metal-containing wastewater.However, the metal-binding capacity of algal cells is limited. Therefore, we improved the cellular Cr(Ⅵ) biosorption capacity of Chlamydomonas reinhardtii by overexpressing the sulfate transporter gene SULTR2. SULTR2 was predominantly located in the cytoplasm of the cell, and few proteins mobilized to the cell membrane as a Cr transporter under Cr stress conditions. Intracellular Cr accumulation was almost doubled in SULTR2-overexpressing transgenic strains after exposure to 30 μM K 2 Cr 2 O 7 for 4 d. Alginate-based immobilization increased the rate of Cr removal from 43.81% to 88.15% for SULTR2-overexpressing transgenic strains after exposure to 10 μM K 2 Cr 2 O 7 for 6 d. The immobilized cells also displayed a significant increase in nutrient removal efficiency compared to that of freeswimming cells. Therefore, SULTR2 overexpression in algae has a great potential for the bioremediation of Cr(Ⅵ)-containing wastewater.

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Thermochemical study of Cr(VI) sequestration onto chemically modified Areca catechu and its recovery by desorptive precipitation method

Cited by 17 publications

References 61 publications

Taguchi Parametric Optimization and Cost Analysis of Hexavalent Chromium Sequestration From Aqueous Solution by NaOH-Modified Garcinia kola Hull Particles

Taguchi Parametric Optimization and Cost Analysis of Hexavalent Chromium Sequestration From Aqueous Solution by NaOH-Modified Garcinia kola Hull Particles

In silico analysis of chromium‐reducing OXR genes derived from tannery effluent‐contaminated soil metagenome

Overexpression of the sulfate transporter‐encoding SULTR2 increases chromium accumulation in Chlamydomonas reinhardtii

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