Enhanced adsorption of metal ions onto Vetiveria zizanioides biochar via batch and fixed bed studies

Tyagi, Uplabdhi

doi:10.1016/j.biortech.2021.126475

Cited by 31 publications

(6 citation statements)

References 43 publications

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“…For the 7.5 cm bed, adsorption performance reported the following order Pb 2+ > Ni 2+ > Cd 2+ ; while for the 4 cm bed, Pb 2+ > Ni 2+ . This affinity of the active sites in the adsorbent for the Pb 2+ (7.18) ions may be due its higher covalent index than Ni 2+ (5.73) and Cd 2+ (5.51) [ 67 ], as well as their ionic binding indexes based on their electronegativity 2.33, 1.91, and 1.61 for Pb 2+ , Ni 2+ , and Cd 2+ , respectively [ 68 ]. According to the classification criteria above, higher values indicate stronger bonds.…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that, relative to ionic interactions, metal ions exhibiting high covalent indices possess high and effective chelating affinity towards ligands. Due to the high covalent index of lead ions, they are more likely to form covalent bonds with the ligands of the adsorbent (cocoa husk) than nickel and cadmium ions, which enhances their adsorption capacity [ 67 ]. From the behavior of the breakthrough curves, it can be said that the very low slope of the curve is due to the low concentration difference between the absorbent solution and the solute of the dissolution after a few minutes of initiated the process, creating a very low concentration gradient, resulting in a weak driving force responsible for the transport of the contaminant from the fluid to the particle structure, which decreases the diffusion coefficient, causing the saturation time of the biomaterial to be increased [ 66 ].…”

Section: Resultsmentioning

confidence: 99%

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Adsorption Study of Continuous Heavy Metal Ions (Pb2+, Cd2+, Ni2+) Removal Using Cocoa (Theobroma cacao L.) Pod Husks

2022

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The serious toxicological effects of heavy metal ions in aquatic ecosystems have motivated the search for alternatives to reduce contamination of water sources from industrial wastewater. In this work, continuous adsorption of nickel, cadmium, and lead was assessed using a packed bed column filled with Cocoa (Theobroma cacao L.) pod husks widely available in the northern region of Colombia. The physicochemical characterization of the agricultural biomass was performed to quantify its chemical composition by bromatological, FT-IR, and energy-dispersive X-ray spectroscopy (EDS). The breakthrough curves were constructed for all heavy metal ions with bed depth of 4 and 7.5 cm, taking aliquots at 10, 30, 60, 90, 120, 150, 180, 210, 240, and 270 min. Moreover, experimental data were fitted to adsorption models in continuous mode to predict adsorptive performance (Adams–Bohart, Thomas, and Yoon–Nelson). For the FT-IR analysis of biomass before and after adsorption, the most representative bands occur around 3200–3900 cm−1 attributed to the presence of hydroxyl groups, showing the destruction of the peaks of lignocellulosic materials. The breakthrough curves revealed that for a 7.5 cm bed, adsorption performance reported the following order of promising results: Pb2+ > Ni2+ > Cd2+; while for a 4 cm bed, Pb2+ > Ni2+. The mechanism of adsorption of the evaluated metals onto cocoa pod husk was attributed to cationic exchange and microprecipitation due to the presence of Ca, K, and Si in the structure of the bio-adsorbent. Finally, the continuous adsorption was modeled under the mathematical expressions of Adams–Bohart, Thomas, and Yoon–Nelson reporting good fitting with correlation coefficient above 0.95.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Adsorption Study of Continuous Heavy Metal Ions (Pb2+, Cd2+, Ni2+) Removal Using Cocoa (Theobroma cacao L.) Pod Husks

2022

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“…The regression outcome indicated that the Langmuir isotherm model was appropriate to describe the adsorption process, which implied that surface monolayer adsorption was predominant for the manganese ion adsorption by BC, Pre-BC, and Post-BC. 32 Accordingly, the theoretical maximum Mn 2+ adsorption capacities of BC, Pre-BC, and Post-BC were 20.59, 28.37, and 8.06 mg g À1 , respectively. Besides, compared with the other biochar derived from woody (about 0.43 mg g À1 ), 33 woody chips (about 1.58 mg g À1 ), 6 and coffee grounds (about 19.6 mg g À1 ) 34 reported previously, Pre-BC showed an outstanding adsorption performance.…”

Section: Adsorption Performancementioning

confidence: 93%

Screening the functions of modified rice straw biochar for adsorbing manganese from drinking water

Zhao

Pan

et al. 2022

RSC Adv.

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“…5d which illustrates that at the pH optimum value, pH 5, both of Co 2+ and Cs + are sorbed as monovalent species. Nano-cryptomelane has a higher affinity towards Cs + more than Co 2+ which may attributed to fact that the atomic radius of Co(OH) + is larger than that of Cs + thus the movement of monovalent cobalt species from the bulk of solution to the surface of nano-cryptomelane is slower than that of Cs + [41,42].…”

Section: Effect Of Initial Effluent H + Ion Concentration (Ph)mentioning

confidence: 99%

Utilization of synthetic nano-cryptomelane for enhanced scavenging of cesium and cobalt ions from single and binary solutions

Ghaly

Metwally

El-Sherief

et al. 2022

J Radioanal Nucl Chem

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The feasibility of using nano-cryptomelane for elimination of cobalt and cesium metal ions from their single and binary solutions was studied. In this respect, the material was prepared and characterized to confirm its chemical composition and structure. Results illustrate that the synthesized nano-cryptomelane has a tunnel structure with particle size ranged between 4 and 6 nm. The material feasibility was detected by conducting a series of batch experiments for determination of the kinetic and equilibrium performance of the removal process. All characteristic Raman bands for Mn–O lattice vibrations within the (2 × 2) tunnel structure of MnO6 octahedral are observed which confirm formation of nano-cryptomelane. The specific surface area (SSA) for nano-cryptomelane was calculated and equal to 299.03 m2/g while the surface fractal information (Ds) was2.53. The process sensitivity to changes of H+ concentration is attributed to changes in structural elements-species distribution at the solid/aqueous interface. The pH optimum value was desired at pH 5 for exchange of Cs+ and/or Co2+ with K+ ions. The equilibrium studies show that Langmuir isotherm model was more fitted to the experimental data than that of Freundlich model.

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Enhanced adsorption of metal ions onto Vetiveria zizanioides biochar via batch and fixed bed studies

Cited by 31 publications

References 43 publications

Adsorption Study of Continuous Heavy Metal Ions (Pb2+, Cd2+, Ni2+) Removal Using Cocoa (Theobroma cacao L.) Pod Husks

Adsorption Study of Continuous Heavy Metal Ions (Pb2+, Cd2+, Ni2+) Removal Using Cocoa (Theobroma cacao L.) Pod Husks

Screening the functions of modified rice straw biochar for adsorbing manganese from drinking water

Utilization of synthetic nano-cryptomelane for enhanced scavenging of cesium and cobalt ions from single and binary solutions

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