Eco-friendly waste water treatment by cow dung powder (Adsorption studies of Cr(III), Cr(VI) and Cd(II) using tracer technique)

Barot, Nisha Suresh; Bagla, Hemlata

doi:10.5004/dwt.2012.2319

Cited by 6 publications

(9 citation statements)

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“…Exhibit revealed that by an increase in contact time, the removal efficiency of heavy metal increased until a stable plateau region appeared at 300 min, indicating an equilibrium condition (Jeyaseelan & Gupta, 2016). For Cr(VI), removal efficiency increased from 18.2% to 93.4% when the contact time was increased from 15 to 300 min, which may be due to the presence of vacant sites at the initial stage (Barot & Bangla, 2012; Nwosu‐Obieogu & Okolo, 2020). However, there is no appreciable change in efficiency with further increase in contact time due to the deposition of ions available on adsorption sites and intraparticle diffusion processes that dominate over adsorption (Amin, Alazba, & Shafiq, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…At low pH, the H 3 O + concentration exceeds far beyond the metal ions and, therefore, it may bound to the sorbent; while at higher pH, the concentration of H 3 O + decreases due to the absorption of positive‐charged metal ions on the active sites of biosorbent (Parab et al., 2006). Apart from this, at low pH, the adsorption decreased due to the electrostatic repulsion of the positive‐charged (H + ) ions (Barot & Bangla, 2012; Parlayici &Pehlivan, 2019). When the pH of the solution increases, the removal percentage increases owing to electrostatic attraction of the positively charged surface over OH ‐ ions (Bayuo, Pelig‐Ba, & Abukari, 2019; Nwosu‐Obieogu & Okolo, 2020).…”

Section: Resultsmentioning

confidence: 99%

“…The empirical correlation equations of these isotherms are represented from equation (3) to (6). The theories associated with isotherms described in studies such as Ahmad, Khan, Giri, Chowdhary, and Chaturvedi (2020) and Barot and Bangla (2012), and Srivastava, Mall, and Mishra (2007). Recently, nonlinear regression gained more attention for minimizing the quadratic error between experimental data and model outputs.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Adsorptive removal of heavy metals from industrial effluents using cow dung as the biosorbent: Kinetic and isotherm modeling

Saraswat

Demir

Gosu

2020

Environmental Quality Mgmt

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This article investigated an eco-friendly technique for the removal of heavy metals using biosorbent derived from cow dung. Heavy metals bearing wastewater were collected from a common effluent treatment plant located at Sangariya, Jodhpur (Rajasthan, India) to evaluate the removal efficiency of synthesized cow dung-activated carbon. The prepared activated carbon materials have a high surface area in the range of 948-1072 m 2 /g and also have significant quantities of micropore and mesopore volumes. Furthermore, pore diameters were in the range of 2.24-2.33 nm. Surface morphology was improved after being treated with NaOH. The adsorbent material was found to be an efficient medium for the removal of Cr(VI) and Cd(II). The results revealed that more than 95.6% of Cr(VI) and 66.88% of Cd(II) were achieved at the optimized condition of pH12.0, initial concentration of heavy metals 10 mg/L, 300 min of contact time, and the dose of 0.2 g/L, whereas only 16.3% removal efficiency was observed for Ni(II). Equilibrium data have been analyzed by Langmuir, Freundlich, Temkin, and Redlich and Peterson (R-P) isotherm models with the help of nonlinear regression analysis. Experimental data were best fitted for Freundlich and R-P isotherms. K E Y W O R D S adsorption, biosorbent, cow dung-activated carbon (CDAC), heavy metal 1 INTRODUCTION Pure water, vital for a healthy environment, is a resource that is adversely affected both quantitatively and qualitatively by man-made activities. Rapid industrialization and urbanization have brought a real water crisis. Industries continue to be a major cause of water pollution due to diverse kinds of waste, especially toxic heavy metal ions released in water bodies, without adequate treatment (Nguyen et al., 2013). Water quality changes significantly with the presence of toxic heavy metals (Ni, Cd, Zn, Hg, Cr, Pb, Cu, and As) when the level exceeds prescribed limits. Thus, it becomes potentially harmful to all kinds of life on this planet. Heavy metals in water streams originate from the effluent of smelters, mines, and various industries such as batteries, tanneries, electroplating, steel, refining ores, paint manufacture, pesticides, fertilizers, pigment manufacture, printing, and photographic sectors (Babalola, 2018). The nature and composition of industrial effluents depend mainly on raw materials, process, and treatment methods. The ingestion of heavy metals via the food chain, in concentrations above the permissible limit, has a detrimental effect on human physiology and other biological systems. Due to their hazardous tendency of accumulation and toxicity, they pose a severe threat to the function of different organs in the human body and aquatic animals (Fu, & Wang, 2011; Rangabhashiyam, Jayabalan, Rajkumar, & Balasubramanian, 2019). Various agencies, viz., the U.S. Environmental Protection Agency (EPA), the Bureau of Indian Standards (BIS), and the Indian Council of Medical Research (ICMR), set regulatory limits for

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

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Adsorptive removal of heavy metals from industrial effluents using cow dung as the biosorbent: Kinetic and isotherm modeling

Saraswat

Demir

Gosu

2020

Environmental Quality Mgmt

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“…Conventional technologies for treating wastewater containing hexavalent chromium include adsorption [18,19], reduction to Cr(III) followed by precipitation [20], biological [21,22] and membrane separation processes [14,23]. Chemical reduction to Cr(III) followed by precipitation is the most used technique for the removal of Cr(VI) ions from polluted wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Removal of chromate ion from aqueous solutions by sponge iron

Zafarani

Bahrololoom

Javidi

et al. 2013

Desalination and Water Treatment

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A B S T R A C THexavalent chromium ion is the most toxic form of chromium ions and it is considered as a hazardous pollutant. So removing this ion from effluents is very important. One possible approach is reducing Cr(VI) to Cr(III) by metallic iron. Sponge iron was used in this study, and the influence of parameters such as the amount of sponge iron in the solution, effect of acid washing of sponge iron, initial pH and temperature of the reaction on the efficiency of the reduction process were investigated. The possibility of reusing and regenerating of used sponge iron was also studied. Furthermore, the effect of sodium tartrate was investigated. This compound eliminates the precipitates of Cr(III), Fe(III) hydroxides, and Cr x Fe 1 À x (OH) 3 and thus reduces surface passivation of sponge iron. X-ray diffraction analysis and scanning electron microscopy images were employed to investigate the chemical composition and surface morphology of the sponge iron before and after the treatment. The results revealed that acid cleaning of the sponge iron, decreasing the solution pH, increasing the temperature and adding sodium tartrate to the solution improve the Cr(VI) removal efficiency. Furthermore, it was found that the used sponge iron can be reused after acid washing.

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“…Many biosorbents have been used in past years for chromium ion (VI) removal; however, the search for an eco-friendly and low-cost biomaterials remains an active area of research. Biosorption potential of Araucaria leaves [10], Wheat (Triticum aestivum) shells [11], Litchi chinensis [12], Sunflower head waste-based biosorbent (FSH) [13], Corinadrum sativum [14], Wood apple shell [15], Mangifera indica bark dust [16], Tobacco leaf [17], Cow dung powder [18], Fruit peel of Trewia nudiflora plant [19], and Ornamental plants [20] have recently been tested for Cr(VI) biosorption. The present study focussed on assessing the ability of environmentally benign adsorbent Artemisia absinthium, which belongs to the family Asteraceae.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) from aqueous solution on seeds ofArtimisia absinthium(novel plant material)

Rao

Ikram

Uddin

2014

Desalination and Water Treatment

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A B S T R A C TArtimisia absinthium, a medicinal plant material, showed excellent adsorption in removing mutagenic Cr(VI) from aqueous solution along with Cu(II), Ni(II), and Zn(II). Various parameters like effect of pH, contact time, temperature, and initial concentration were investigated using batch process to optimize conditions for maximum adsorption. A. absinthium was characterized using scanning electron microscopy (SEM). Adsorption of Cr(VI) was favorable at pH 2 as 96% of Cr(VI) could be removed from aqueous solution. However, adsorption of Cr(VI) decreased to 73% in presence of electrolyte (0.1 N KNO 3 ) at pH 2. The point of zero charge of A. absinthium was 3.9 in double distilled water. The adsorption data were analyzed using Langmuir, Freundlich, Temkin, Hasley, and Dubinin-Redushkeuich isotherm models at 30, 40, and 50˚C. The maximum monolayer adsorption capacity towards Cr(VI) was found to be 46.99 mg g −1 at 30˚C which was relatively large compared to some other similar adsorbents reported earlier. The kinetic data showed that pseudo-second-order rate equation was better obeyed than pseudo-first-order. The intra-particle diffusion model showed that Cr(VI) adsorption involved three different stages. The breakthrough and exhaustive capacities of the adsorbent were found to be 35 and 45 mg g −1 , respectively, at pH 2. Desorption study showed that 93.05% Cr(VI) could be desorbed by column operation with 0.01 N NaOH solution.

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Eco-friendly waste water treatment by cow dung powder (Adsorption studies of Cr(III), Cr(VI) and Cd(II) using tracer technique)

Cited by 6 publications

References 0 publications

Adsorptive removal of heavy metals from industrial effluents using cow dung as the biosorbent: Kinetic and isotherm modeling

Adsorptive removal of heavy metals from industrial effluents using cow dung as the biosorbent: Kinetic and isotherm modeling

Removal of chromate ion from aqueous solutions by sponge iron

Removal of Cr(VI) from aqueous solution on seeds ofArtimisia absinthium(novel plant material)

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