Qualitative and quantitative characterisation of adsorption mechanisms of lead on four biochars

Shen, Zhengtao; Zhang, Yiyun; Jin, Fei; McMillan, Oliver; Al‐Tabbaa, Abir

doi:10.1016/j.scitotenv.2017.08.008

Cited by 172 publications

(65 citation statements)

References 47 publications

(76 reference statements)

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“…They have many special properties, including high pH, large carbon content and adsorption capacity (Cantrell, Hunt, Uchimiya, Novak, & Ro, ; Mukome, Zhang, Silva, Six, & Parikh, ; Singh, Singh, & Cowie, ). These properties make it suitable for reducing soil acidification, increasing plant nutrients and enhancing soil carbon sequestration (Awasthi et al, ; Shen, Zhang, Jin, McMillan, & Al‐Tabbaa, ; Yu et al, ). The large porosity is another important and attractive property of the biochar.…”

Section: Introductionmentioning

confidence: 99%

Reconfiguration of macropore networks in a silty loam soil following biochar addition identified by X‐ray microtomography and network analyses

2019

European J Soil Science

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Biochars are widely applied to improve soil pore structures. However, the quantitative effects of biochars on soil macropore networks still remain unclear. In this study, the effects and possible mechanism of biochar application on soil macropore networks were investigated quantitatively by industrial X‐ray microtomography (CT), a pore network model and network analyses. Soil cores of 5 cm in diameter and 10 cm in height were collected from a paddy soil (Typic Haplustalf) without biochar application (CK), and amended with rice straw biochar (RSB), corn straw biochar (CSB) and bamboo biochar (BB) at a rate of 25 Mg ha−1 (w/w). Results revealed that the total and connected macroporosity of the biochar‐amended soil was reduced significantly compared with CK, whereas the reverse was true for the isolated porosity. The three types of biochars exhibited different effects on macropores of the soil, depending on their size and shape. The pore network model and network analyses showed that the physical and topological structures of macropore networks in biochar‐amended soil were clearly reconfigured. The accessibility of these macropore networks was markedly reduced. Our results indicated that the incorporation of biochar did not necessarily increase the soil's macroporosity. The combination of pore network model and network analyses was effective for quantifying key properties of soil macropore networks affected by the incorporation of biochar. The changes in these properties may be used to evaluate the effects of biochar on water, air and nutrient transport. Highlights Effect of biochars on the soil macropore structure was studied by industrial CT. Macropore network structure was quantified by a pore network model and network analyses. Biochar incorporation markedly changed the accessibility of the soil macropore network. The macropore network of soil can be reconfigured following biochar addition.

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Section: Introductionmentioning

confidence: 99%

Reconfiguration of macropore networks in a silty loam soil following biochar addition identified by X‐ray microtomography and network analyses

2019

European J Soil Science

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“…These attractive properties make soft wood as an ideal candidate to synthesize the carbon material. To the best of our knowledge, there is only few studies on soft wood for the removal of heavy metals such as Cu 2+ , Zn 2+ and Pb 2 + , [10,22] but the facile synthesis of N-doped carbon derived from soft wood and further utilized for the removing of Cr(VI) in wastewater is not reported. Herein, the hierarchical porous N-doped carbon fabricated from the renewable biomass soft wood was achieved by a modified solvo-hydro-thermal method.…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Cr(VI) from Aqueous Solution on the Hierarchical Porous N-Doped Carbon Derived from Soft Wood

Li¹,

Shi²,

Lu³

et al. 2019

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Efficient removal of Cr(VI) is one of challenges in wastewater treatment and remediation. The hierarchical porous N-doped carbon derived from renewable soft wood is facilely fabricated by a solvo-hydrothermal method and utilized to remove Cr(VI) efficiently. The as-obtained N-doped carbon exhibits hierarchical porous structure and large specific surface area of 324.2 cm 2 /g. The fabricated N-doped porous carbon can rapidly and efficiently adsorb Cr(VI) in 1 h and the adsorption process follows the pseudo-second-order model. The high adsorption capacity of 182.8 mg/g based on Langmuir model, and it is competitive with other carbon materials reported to date. Besides, the hierarchical porous carbon is easy to be recycled and the adsorption performance maintains stable over five runs.

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“…A recovery range of 82.4-98.7% was observed for sequential extraction of Cd 2+ from two Cd-loaded woody biochars (Frišták et al, 2015). The sequential extraction recovery of Pb 2+ from three biochars after Pb 2+ sorption was within 78.41-85.52% (Shen et al, 2017). The net amount of released cations (K + , Ca 2+ , Mg 2+ , and Ba 2+ ) during Pb 2+ and Cd 2+ sorption by OS500 were calculated and shown in Table 5.6.…”

Section: Sequential Extraction Resultsmentioning

confidence: 87%

“…The Pb 2+ or Cd 2+ sorbed on char through physical sorption represent the water soluble fraction, whereas those sorbed through cation exchange with a weak binding strength (no metal exchange reaction) represent the exchangeable fraction (Cao et al, 2019). The fraction bound to carbonate may come from the Pb 2+ or Cd 2+ sorbed via cation-π interaction or the formation of precipitates and complex (Morera et al, 2001;Shen et al, 2017). The fractions from step 4, 5, 6 in sequential extraction may result from the formation of stable complexes with organic matter or precipitates that cannot be dissolved in the NaOAc/HOAc solution (Shen et al, 2017).…”

Section: Wsmentioning

confidence: 99%

“…The fraction bound to carbonate may come from the Pb 2+ or Cd 2+ sorbed via cation-π interaction or the formation of precipitates and complex (Morera et al, 2001;Shen et al, 2017). The fractions from step 4, 5, 6 in sequential extraction may result from the formation of stable complexes with organic matter or precipitates that cannot be dissolved in the NaOAc/HOAc solution (Shen et al, 2017).…”

Section: Wsmentioning

confidence: 99%

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Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Tian¹

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The effective treatment of oily sludge has been a challenging problem faced by the petroleum industry worldwide. It is a semi-solid mixture of hydrocarbons, water, metallic ions, and suspended fine solids. The recalcitrant nature of oily sludge makes the treatment a difficult and costly task. The objective of this dissertation research was to develop environmentally friendly and economically competitive techniques for oily sludge treatment. Three different approaches were developed: ionic liquid (IL)-enhanced solvent extraction, co-pyrolysis with wood waste, and value-added utilization of oily sludge as sorbent to remove lead (Pb 2+) and cadmium (Cd 2+) from solution. Firstly, as compared to conventional solvent extraction, the ILenhanced solvent extraction not only improved oil recovery efficiency but also greatly reduced solvent and energy consumption as well as shortening the treatment duration even at low IL concentration. Secondly, co-pyrolysis of oily waste and hog fuel was conducted in a fixed bed reactor. Three experimental parameters (pyrolysis temperature, reaction time, and hog fuel addition) were explored to optimize both oil recovery and metal ion immobilization. The latter was tested through sequential extraction techniques with high temperature pyrolysis leading to metal ions fixed within the residues. The addition of hog fuel had a significant synergistic effect on the distribution of metal ions in the various extraction fractions resulting in lower risk index (RI) values. Thirdly, the oily sludge-derived char (OS500) obtained at 500 °C could effectively remove Pb 2+ from solution with the maximum sorption capacity of 373.2 mg/g (based on a Langmuir model). Sorption of Pb 2+ by the OS500 was mainly attributed to its precipitation with carbonate (CO3 2-) originating in OS500. The maximum sorption capacity for Cd 2+ , using a Langmuir model, was 23.19 mg/g. Complexation and metal ion exchange dominated Cd 2+ sorption on OS500. The Pb 2+ sorption capacity dramatically decreased as the iii pyrolysis temperature increased from 500 to 900 °C due to the decomposition of minerals which could release CO3 2at high temperature. The activated OS500 showed a higher sorption capacity (90.06 mg/g) for Cd 2+ than OS500 (23.95 mg/g) because conversion of barite (BaSO4) to witherite (BaCO3) after chemical activation favored the precipitation of Cd-carbonate. iv CO-AUTHORSHIP For all the chapters in this dissertation, I was the principal investigator including design of studies, acquisition of data, and analysis of data. I wrote the manuscripts and was responsible for incorporating comments and feedbacks in the revised manuscripts. Dr. Jianbing Li supervised the experiments and contributed to experimental design, data analysis, and revision of the manuscripts. He is included in authorship on all resulting publications. Dr. Bill McGill and Dr. Todd Whitcombe contributed to the design and implementation of experiments and helped review and improve the manuscripts, so they were included in some of my publications. Dr. ...

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Qualitative and quantitative characterisation of adsorption mechanisms of lead on four biochars

Cited by 172 publications

References 47 publications

Reconfiguration of macropore networks in a silty loam soil following biochar addition identified by X‐ray microtomography and network analyses

Reconfiguration of macropore networks in a silty loam soil following biochar addition identified by X‐ray microtomography and network analyses

Efficient Removal of Cr(VI) from Aqueous Solution on the Hierarchical Porous N-Doped Carbon Derived from Soft Wood

Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

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