Competitive adsorption of heavy metals onto sesame straw biochar in aqueous solutions

Park, Jong Hwan; Ok, Yong Sik; Kim, Seong Heon; Cho, Ju Sik; Heo, Jong-Soo; DeLaune, Ronald D.; Seo, Dong Cheol

doi:10.1016/j.chemosphere.2015.05.093

Cited by 606 publications

(208 citation statements)

References 33 publications

(39 reference statements)

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“…However, the Cd sorption amount increased secondly when the initial Cu concentration reached 100 mg L −1 , and the Cu sorption amount dropped for large/middle sediment particles (Figure 4). With regard to the change in the sorption sequence for the lowest and highest added metal concentrations added, some studies have indicated that the maximum adsorption capacities are in the order of Cd > Cu in a mono-metal non-competitive experiment and Cu > Cd in a multi-metal competitive trial [34]. This sequence is coincidental with the reverse order of the hydrated ionic radii of two heavy metal species (Cu 2+ and Cd 2+ ), and, thus, space limitations to sorption will be less important when the added metal concentrations are low, because many adsorption sites are still available, whereas the opposite will occur when the added metal concentrations are high.…”

Section: Sorption Isotherms Of Cu and CD On Sedimentsmentioning

confidence: 99%

Binary Component Sorption of Cadmium, and Copper Ions onto Yangtze River Sediments with Different Particle Sizes

2017

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Sorption is a crucial process that influences immobilization and migration of heavy metals in an aqueous environment. Sediments represent one of the ultimate sinks for heavy metals discharged into water body. Moreover, the particle size of sediments plays an extremely important role in the immobilization of heavy metals. In this study, the sorption and desorption of cadmium (Cd) and copper (Cu) onto sediments with different particle sizes were investigated to predict the rate and capacity of sorption, to understand their environmental behaviors in an aqueous environment. Batch sorption and kinetic experiments were conducted to obtain the retained amount and rate of Cd and Cu in a binary system. Experimental data were simulated using sorption models to ascertain the sorption capacity and the kinetic rate. Results of European Communities Bureau of Reference (BCR) sequential extraction showed the highest concentration of Cd (0.344 mg kg −1 ), and its distribution varied with sediment particle size and site. Furthermore, most of Cu (approximately 57% to 84%) existed as a residual fraction. The sorption of Cu onto six sediments followed a pseudo-first order reaction, whereas that of Cd followed a pseudo-second order reaction. Additionally, the competitive Langmuir model fitted the batch sorption experimental data extremely well. The highest sorption capacities of Cd and Cu reach 0.641 mmol kg −1 and 62.3 mmol kg −1 , respectively, on the smallest submerged sediment particles. The amounts of Cu and Cd desorbed (mmol kg −1 ) increased linearly with the initial concentration increasing. Thus, sediment texture is an important factor that influences the sorption of heavy metal onto sediments.

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Section: Sorption Isotherms Of Cu and CD On Sedimentsmentioning

confidence: 99%

Binary Component Sorption of Cadmium, and Copper Ions onto Yangtze River Sediments with Different Particle Sizes

2017

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“…The dendrogram of functional groups with Cu (II) removal. (Park et al, 2016). Therefore, the application of mHLG in natural water environments needs also further exploration systematically.…”

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confidence: 99%

Effect of H2O2 concentrations on copper removal using the modified hydrothermal biochar

Zuo

Liu

Chen

2016

Bioresource Technology

108

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h i g h l i g h t s) > mHLG0 (35.8 mg g À1 ), which was higher than the results from majority of previous studies, suggesting that H 2 O 2 modification advanced sorption capacity of hydrothermal biochars evidently. Effect mechanisms exploration indicated that the difference of Cu (II) removal by biochars before and after the modification was mainly related to functional groups. Carboxylic group was responsible for the best sorption property of Cu (II) by mHLG2, which was attributed to its significant relationships with H 2 O 2 modification and Cu (II) removal.

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“…However, such phenomena can also occur if there is competition for adsorption at surface sites from ions in solution, unforeseen impurities such as water in non-aqueous systems [36], or even solvent molecules themselves. This model can be used to predict competitive adsorption kinetics of heavy metals on kaolinite [37] or onto sesame straw biochar [38] and also in the separation studies of tungsten (W) and molybdenum (Mo) [39,40].…”

Section: Two Adsorbing Species Modelmentioning

confidence: 99%

Modeling two-rate adsorption kinetics: Two-site, two-species, bilayer and rearrangement adsorption processes

Tripathi

Tabor

2016

Journal of Colloid and Interface Science

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Competitive adsorption of heavy metals onto sesame straw biochar in aqueous solutions

Cited by 606 publications

References 33 publications

Binary Component Sorption of Cadmium, and Copper Ions onto Yangtze River Sediments with Different Particle Sizes

Binary Component Sorption of Cadmium, and Copper Ions onto Yangtze River Sediments with Different Particle Sizes

Effect of H2O2 concentrations on copper removal using the modified hydrothermal biochar

Modeling two-rate adsorption kinetics: Two-site, two-species, bilayer and rearrangement adsorption processes

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