Mechanisms of metal sorption by biochars: Biochar characteristics and modifications

Li, Hongbo; Dong, Xueliang; Silva, Evandro B. da; Oliveira, Luciana Magda de; Chen, Yanshan; Lena, Q.

doi:10.1016/j.chemosphere.2017.03.072

Cited by 1,399 publications

(504 citation statements)

References 96 publications

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“…Qian et al reported that surface area and micropores of biochar contribute significantly to the sorption of organic contaminants from water. However, the size of these pores is also important for this removal, since targeted chemicals are found in different molecular sizes …”

Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: specific surface area and pore size distribution measurements—BET, BJH, and DFT

2019

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Gas physisorption is an experimental technique based on equilibrium Van der Waals interactions between gas molecules and solid particles, that quantifies the specific surface area (SSA), pore size distribution (PSD), and pore volume of solids and powders. The performance of catalysts, absorbents, chromatography column materials, and polymer resins depends on these morphological properties. Here we introduce the basic principles and procedures of physical adsorption, especially nitrogen physisorption, as a guide to students and researchers unfamiliar with the field. The Brunauer‐Emmett‐Teller theory (BET) is a common approach to estimate SSA that extends the Langmuir monolayer molecular adsorption model to multilayer layers. It relies on an equilibrium adsorption isotherm, measured at the normal boiling point of the adsorbate, eg, 77 K or 87 K for N2 and Ar, respectively. Web of Science indexed 45 400 articles in 2016 and 2017 that mentioned N2 adsorption porosimetry—BET and BJH (Barrett‐Joyner‐Halenda) keywords. The VOSViewer bibliometric tool grouped these articles into four research clusters: adsorption, activated carbon in aqueous solutions for removal of heavy metal ions; synthesis of nanoparticles and composites; catalysts performance in oxidation and reduction processes; and photocatalytic degradation with TiO2. According to the literature, the accuracy of the density function theory (DFT) method is higher than with the BJH theory and it is more reliable.

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Section: Applicationsmentioning

confidence: 99%

Experimental methods in chemical engineering: specific surface area and pore size distribution measurements—BET, BJH, and DFT

2019

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“…); although they are focused on metals, the concept applies to any function group (Li et al . ). The surface charge of biochar particle will change in response to sorption mechanism/contaminant; as processes change, the surface charge will be changing, leading to changes in the imaginary conductivity response (Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Adsorption mechanisms on biochar (as described by Li et al . () can have a profound effect on SIP signatures.…”

Section: Resultsmentioning

confidence: 99%

“…Li et al . () discusses the different sorption mechanisms on biochars (Fig. ); although they are focused on metals, the concept applies to any function group (Li et al .…”

Section: Resultsmentioning

confidence: 99%

“…Although the surface reactions (metals versus biochars) are probably not the same, we believe that charge transfer processes on the biochar surface (Li et al . ) could significantly impact the polarization signatures and are worth investigating.…”

Section: Methodsmentioning

confidence: 99%

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Preliminary assessment on the application of biochar and spectral‐induced polarization for wastewater treatment

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In this work, we explore the use of biochar as a remediation agent, and the sensitivity of the spectral‐induced polarization method as a remediation monitoring aid. Biochar amended columns were fully saturated with industrial wastewater (olive oil mill waste) with very high concentration of phenols (∼2485 mg/L) and other substances. The biochar‐amended columns achieved very high removal rates of phenols compared to the control (sand only). Geophysical monitoring over the duration of the experiment (10 days) showed changes in the spectral‐induced polarization signal (imaginary conductivity) consistent with phenol removal as confirmed by geochemical monitoring. This experiment confirmed the utility of biochar as a remediation agent. Furthermore, spectral‐induced polarization can serve as long‐term, high resolution, monitoring aid in organic contaminant degradation processes.

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Use of Organic Amendments in Phytoremediation of Metal‐Contaminated Soils: Prospects and Challenges

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Handbook of Assisted and Amendment: Enhanced Sustainable Remediation Technology

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Mechanisms of metal sorption by biochars: Biochar characteristics and modifications

Cited by 1,399 publications

References 96 publications

Experimental methods in chemical engineering: specific surface area and pore size distribution measurements—BET, BJH, and DFT

Experimental methods in chemical engineering: specific surface area and pore size distribution measurements—BET, BJH, and DFT

Preliminary assessment on the application of biochar and spectral‐induced polarization for wastewater treatment

Use of Organic Amendments in Phytoremediation of Metal‐Contaminated Soils: Prospects and Challenges

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