Chromium (VI) removal from aqueous solutions using Eichhornia as an adsorbent

Rani, Nisha; Singh, Bhupender; Shimrah, Tuisem

doi:10.2166/wrd.2016.094

Cited by 13 publications

(5 citation statements)

References 12 publications

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“…The aquatic plant, E. crassipes, grows in wetlands and is usually contaminated with organic matter, which tends to its rapid expansion in the surface where a layer is created that does not allow oxygen access to the interior of the water; therefore, they cease to exist microorganisms vital to the ecosystem. (Martínez et al 2013;Saraswat and Rai 2010;Feng et al 2017;Liu et al 2018;Mohammed et al 2018;Adornado et al 2017;Rani et al 2017;Mahunon et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Estimation of equilibrium times and maximum capacity of adsorption of heavy metals by E. crassipes (review)

Sayago

Castro

Rivera

et al. 2020

Environ Monit Assess

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Cellulose emerges as an alternative for the treatment of water contaminated with heavy metals due to its abundant biomass and its proven potential in the adsorption of pollutants. The aquatic plant Eichhornia crassipes is an option as raw material in the contribution of cellulose due to its enormous presence in contaminated wetlands, rivers, and lakes. The efficiency in the removal of heavy metals is due to the cation exchange between the hydroxyl groups and carboxyl groups present in the biomass of E. crassipes with heavy metals. Through different chemical and physical transformations of the biomass of E. crassipesThe objective of this review article is to provide a discussion on the different mechanisms of adsorption of the biomass of E. crassipes to retain heavy metals and dyes. In addition to estimating equilibrium, times through kinetic models of adsorption and maximum capacities of this biomass through equilibrium models with isotherms, in order to design one biofilter for treatment systems on a larger scale represented the effluents of a real industry.

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Section: Introductionmentioning

confidence: 99%

Estimation of equilibrium times and maximum capacity of adsorption of heavy metals by E. crassipes (review)

Sayago

Castro

Rivera

et al. 2020

Environ Monit Assess

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“…In line with this, many activated carbons produced from locally available materials such as bamboo, coconut husks, willow peat, wood, lignite, coal, water hyacinth, and petroleum pitch have been reported [ 23 , 27 , 28 ]. Some of these activated carbons have been applied for Cr from aqueous solutions and wastewater [ 21 , 29 – 32 ]. Generally, for water purification use water hyacinth as an adsorbent material.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of chromium from electroplating wastewater using activated carbon developed from water hyacinth

Worku,

Tibebu,

Nure

et al. 2023

BMC Chemistry

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Industrial wastewater polluted with high concentrations of Cr is commonly discharged into water resources without proper treatment. This gives rise to the deterioration of water quality and imposes adverse effects on public health. Therefore, this study is aimed at removing Cr from electroplating wastewater using activated carbon produced from water hyacinth under a full factorial experimental design with three factors and three levels (pH,2,5 and 8, adsorbent dose 0.5,1and1.5 in 100 mL and contact time 30, 60 and120 min). A phosphoric acid solution of 37% was used to activate the carbon, which was then subjected to thermal decomposition for 15 min at 500 °C. The activated carbon was characterized by the presence of a high surface area (203.83 m2/g) of BET, cracking of adsorbent beads of SEM morphology, amorphous nature of XRD, and many functional groups of FTIR such as hydroxyl (3283 cm−1), alkane (2920 cm−1), nitrile (2114 cm−1) and aromatics (1613 cm−1). The minimum Cr adsorption performance of 15.6% was obtained whereas maximum removal of 90.4% was recorded at the experimental condition of pH 2, adsorbent dose of 1.5 g/100 mL, and contact time of 120 min at a fixed value of initial Cr concentration of 100 mg/L. Similarly, the maximum Cr removal from real electroplating wastewater was 81.2% at this optimum point. Langmuir's model best described the experimental value at R2 0.96 which implies the adsorption is chemically bonded, homogeneous, and monolayer. Pseudo-second-order model best fits with the experimental data with R2 value of 0.99. The adsorbent was regenerated for seven cycles and the removal efficiency decreased from 93.25% to 21.35%. Finally, this technology is promising to be scaled up to an industrial level.

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“…Various methods of fluoride removal have their own limitations, but the adsorption method is regarded as the most promising method because of its simple process and low cost [11, 12]. At the same time, the adsorption method is also widely used to remove other pollutants such as chromium (IV) [13, 14]. To date, Ti(IV)-modified granular activated carbon [15], cerium-containing bone char [16], activated alumina [17], Mn-Ce oxide [18], Al-Fe (hydr)oxides [19], a magnesium-iron-aluminum trimetal composite [20], and hydrous zirconium oxide [21] have been used as fluoride adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

Liu

Zhao

et al. 2019

Bioinorganic Chemistry and Applications

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To make full use of natural waste, a novel Mg-Al mixed oxide adsorbent was synthesized by the dip-calcination method using the fluff of the chinar tree (FCT) and an Mg(II) and Al(III) chloride solution as raw materials. The adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The effects of the Mg/Al molar ratio and calcination temperature on the performance of the novel Mg-Al mixed oxide adsorbent were investigated. The optimized Mg-Al mixed oxide adsorbent had a Langmuir adsorption capacity of 53 mg/g. This adsorption capacity was higher than that of the separate Mg oxide and Al oxide. The synergy between Mg and Al is beneficial to the adsorption performance of the material. The fluoride adsorption capacity of the optimized Mg-Al mixed oxide adsorbent is only slightly affected by ions such as Cl−, NO3−, SO42−, Na+, and K+ and is excellent for use in recycling and real water. The hydroxyl groups on the surface of the Mg-Al mixed oxide adsorbent play a key role in the adsorption of fluorine. The as-obtained novel Mg-Al mixed oxide adsorbent is an efficient and environmentally friendly agent for fluoride removal from drinking water.

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Chromium (VI) removal from aqueous solutions using Eichhornia as an adsorbent

Cited by 13 publications

References 12 publications

Estimation of equilibrium times and maximum capacity of adsorption of heavy metals by E. crassipes (review)

Estimation of equilibrium times and maximum capacity of adsorption of heavy metals by E. crassipes (review)

Adsorption of chromium from electroplating wastewater using activated carbon developed from water hyacinth

Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

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