Highly Efficient Lead Distribution by Magnetic Sewage Sludge Biochar: Sorption Mechanisms and Bench Applications

Ifthikar, Jerosha; Wang, Jia; Wang, Qiliang; Wang, Ting; Wang, Huabin; Khan, Aimal; Ali, Jawad; Sun, Tingting; Xiang, Jing; Chen, Zhuqi

doi:10.1016/j.biortech.2017.03.133

Cited by 231 publications

(82 citation statements)

References 46 publications

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“…However, to predict whether such changes will increase sorption, it is key to understand which adsorption mechanisms dominate. A variety of adsorption mechanisms have been proposed to describe interactions between biochar and organic compounds including hydrophobic interactions, electrostatic surface complexation, ion exchange, hydrogen bonding, π-π interactions, co-precipitation, inner-sphere complexation, and the formation of charge-transfer metal complexes [7,8]. The degree of adsorption, as well as the mechanisms involved, depends on the interactions between the properties of the biochar, the chemical involved, as well as the solution chemistry.…”

Section: Introductionmentioning

confidence: 99%

Understanding Activation Effects on Low-Temperature Biochar for Optimization of Herbicide Sorption

et al. 2019

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Activation treatments are often used as a means of increasing a biochar’s sorption capacity for agrochemical compounds but can also provide valuable insight into sorption mechanisms. This work investigates the effects of H2O2 activation on a low-temperature (350 °C) grape wood biochar, evaluates subsequent changes to the removal efficiency (RE) of cyhalofop and clomazone, and elucidates potential sorption mechanisms. Activation by H2O2 decreased the biochar pH, ash content, and C content. Additionally, the biochar O content and surface area increased following activation, and Fourier transform infrared spectroscopy (FTIR) data suggested a slight increase in surface O groups and a decrease in aliphatic C. Cyhalofop RE significantly increased following activation, while clomazone RE was unchanged. The increased sorption of cyhalofop was attributed to pH effects and charge-based interactions with biochar O moieties. Results from this study suggest that H2O2 activation treatments on low-temperature biochars may improve the removal of organic acid herbicides but are of little value in optimizing the removal of polar, non-ionizable herbicides.

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Section: Introductionmentioning

confidence: 99%

Understanding Activation Effects on Low-Temperature Biochar for Optimization of Herbicide Sorption

et al. 2019

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“…Biochar can be applied as an adsorbent to water and wastewater treatment for a wide range of pollutants such as lead, arsenic, copper, cadmium, chromium, mercury, zinc, and nickel [10,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Application of Biochar to the Remediation of Pb-Contaminated Solutions

2018

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BIOTON® biochar, produced by a wood biomass pyrolysis process, which is usually applied as soil amendment, was investigated for a novel application, i.e., the adsorption of lead from contaminated solutions. The experimental activity included physical and chemical characterization of BIOTON®; and Scanning Electron Microscope (SEM) images to highlight its internal structure. The adsorption process was investigated through batch and column experiments. Adsorption kinetics showed very rapid achievement of equilibrium conditions, i.e., 50 mg/L and 100 mg/L initial Pb concentration at 2 h and 4 h, respectively. Complete removal also occurred within the same time. The Brunauer–Emmett–Teller model was a better fit for the equilibrium data of both Pb concentrations, whereas the kinetics were best represented by the pseudo second-order model. Column tests showed that the addition of biochar as an adsorbent media within the bed significantly extended the time of breakthrough and exhaustion, with respect to the column filled with soil only. The values found for the adsorption capacity of BIOTON®- versus lead-containing solutions were comparable to those reported for commercial adsorbents. Therefore, BIOTON® can be considered a valid option: It also offers the additional benefit of allowing the recovery of a residue, which alternately would need to be disposed of.

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“…This effect of ionic strength on Pb(II) adsorption could be due to the competition between Pb(II) ions and the electrolyte cations (Na + ) for the binding sites. Thereafter, the electrolyte cations compete much more effectively with the negatively charged sites (Si-O) on kaolinite surface than on the aluminol sites (Al-OH) (Jiang et al 2010). Therefore, a decrease in the adsorption efficiency with increasing electrolyte concentration would make the kaolinite surface less negatively charged, which would decrease the Pb(II) adsorption (Unuabonah et al 2008).…”

Section: Effect Of Ionic Strengthmentioning

confidence: 99%

Enhanced interlayer trapping of Pb(II) ions within kaolinite layers: intercalation, characterization, and sorption studies

Maged

Ismael

Kharbish

et al. 2019

Environ Sci Pollut Res

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Lead (Pb(II)) pollution in water poses a serious threat to human health in many parts of the world. In the past decades, research has been aimed at developing efficient and cost-effective methods to address the problem. In this study, dimethyl sulfoxide (DMSO) and potassium acetate (K-Ac) intercalated kaolinite complexes were synthesized and subsequently utilized for Pb(II) removal from water. The intercalation of kaolinite with DMSO was found to be useful for expanding the interlayer space of the clay mineral from 0.72 to 1.12 nm. Kaolinite intercalation with K-Ac (KDK) increased the interlayer space from 1.12 to 1.43 nm. The surface area of KDK was found to be more than threefold higher as compared to natural kaolinite (NK). Batch experimental results revealed that the maximum Pb(II) uptake capacity of KDK was 46.45 mg g −1 which was higher than the capacity of NK (15.52 mg g −1). Reusability studies showed that KDK could be reused for 5 cycles without substantially losing its adsorption capacity. Furthermore, fixed-bed column tests confirmed the suitability of KDK in continuous mode for Pb(II) removal. Successful application of intercalated kaolinite for Pb(II) adsorption in batch and column modes suggests its application in water treatment (especially removal of divalent metals).

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Highly Efficient Lead Distribution by Magnetic Sewage Sludge Biochar: Sorption Mechanisms and Bench Applications

Cited by 231 publications

References 46 publications

Understanding Activation Effects on Low-Temperature Biochar for Optimization of Herbicide Sorption

Understanding Activation Effects on Low-Temperature Biochar for Optimization of Herbicide Sorption

Application of Biochar to the Remediation of Pb-Contaminated Solutions

Enhanced interlayer trapping of Pb(II) ions within kaolinite layers: intercalation, characterization, and sorption studies

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