Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass.

By Zhengang Liu, Fu-Shen Zhang. Journal of Hazardous Materials, 2009

708 citations recorded by the source corpus.

Hydrothermal conversion of biomass into biofuel could produce a special type of biochar as byproduct. This biochar is quite different from biochar derived from high temperature pyrolysis. In the present study, two biochars, prepared from hydrothermal liquefaction of pinewood (P300) and rice husk (R300), were characterized and investigated for lead removal from aqueous solution. The results indicated that the biochars contained a large amount of oxygen-containing groups on the surface, which were quite effective for lead removal with capacities of 4.25 and 2.40 mg/g for P300 and R300, respectively. The adsorption equilibrium was achieved around 5h. Higher temperature favored the removal capacity implying that the adsorption was an endothermic process. The adsorption data at optimum solution pH 5 could be well described by Langmuir model and the adsorption process was well fitted by pseudo-second-order model. Moreover, it was found that the adsorption was mainly controlled by film diffusion. Thermodynamics analysis suggested that lead adsorption onto the biochars was physical endothermic process.

Subfields: Biomedical Engineering, Geochemistry and Petrology, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/cea4d745f51b6e3b39cf2fdad919a165c93d86cc

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Citations in the corpus

Surface characterization of rice husk bio-char produced by liquefaction and application for cationic dye (Malachite green) adsorption (2015, background): “Recently, liquefaction, a low temperature (250–350 C) and high pressure (5–20 MPa) process with solvent participation (including hydrothermal liquefaction which use water as the solvent), which was commonly used for bio-oil (main product) production, has been taken into account for potential effecti”
Fluoride removal from ground water using magnetic and nonmagnetic corn stover biochars (2014, methodology): “Water purification using biochar is relatively a new practice (Ahmad et al., 2014; Liu and Zhang, 2009; Mohan et al., 2007, 2011a, 2012, 2014a,b; Oh et al., 2012; Rajapaksha et al., 2014).”
Wood-based biochar for the removal of potentially toxic elements in water and wastewater: a critical review (2018, background): “in temperature could provide metal ions sufficient energy to overcome a diffuse double-layer and sequester into the interior structure of the biochar [121].”
Biochar as a Multifunctional Component of the Environment—A Review (2019, neutral): “Pyrene Corncob (600 ◦C) Water [91] Sawdust (400 i 700 ◦C) [92] Trichloroethylene Peanut shell (300 and 700 ◦C) Water [93] Naphthalene Pine needles (100–700 ◦C) Water [94] Heavy metals Cadmium Miscanthus sacchariflorus (300–600 ◦C) Water [95] Aluminum Rice straw (100–600 ◦C) Water [29] Lead Pine wood”
Hydrothermal conversion of biomass waste to activated carbon with high porosity: a review. (2016, background): “Pinewood hydrochar resulted in high content of OFG and thus resulted in 77% higher removal of lead [1].”
A review of biochar as a low-cost adsorbent for aqueous heavy metal removal (2016, background): “Hydrothermal rice husk char 300 Pb Complexation of Pb2C with oxygen functional groups (Liu and Zhang, 2009) Bone char Not reported Cu, Zn Ionic exchange between Cu (II) and Zn(II) with Ca(II) from calcium hydroxyapatite and calcium carbonate in bone char (Cheung et al.”
Cadmium and lead remediation using magnetic oak wood and oak bark fast pyrolysis bio-chars (2014, neutral): “89 – [64] Synthetic 5.”
Upgrading of waste biomass by hydrothermal carbonization (HTC) and low temperature pyrolysis (LTP): A comparative evaluation (2014, background): “Even the heavy metals cannot hydrolyze thoroughly, the heavy metal also has strong co-ordination ability and they can coordinate with the increased functional groups on the surface of the hydrothermally prepared biochars, resulting in high retention rates [21].”
Characterization of biochars produced from oil palm and rice husks and their adsorption capacities for heavy metals (2014, positive): “Liu and Zhang (2009) investigated the removal of Pb from water using biochars prepared from the hydrothermal liquefaction of pinewood and rice husks, and they found that the two biochars were quite effective at removing Pb from water.”