Effect of modified coconut shell biochar on availability of heavy metals and biochemical characteristics of soil in multiple heavy metals contaminated soil

Liu, Huakang; Xu, Fei; Xie, Yifan; Wang, Can; Zhang, Akang; Li, Lingling; Xu, Heng

doi:10.1016/j.scitotenv.2018.07.115

Cited by 211 publications

(46 citation statements)

References 38 publications

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“…Acid pickling and ultrasonic treatment methods improve the physicochemical properties of BCs, the immobilization effect of heavy metals, and the soil micro-environment. The acid-soluble Cd, Nickel (Ni), and Zinc (Zn) elements were decreased by 30.1%, 57.2%, and 12.7%, respectively (Liu et al 2018a). Therefore, it is necessary to modify the microstructure and surface properties of BC to enhance its remediation ability (Rajapaksha et al 2016;Fang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of cadmium by magnesium-modified biochar at different pyrolysis temperatures

Chen

Shan

Sun

2019

BioRes

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Metal pollution in soil is an increasing concern. Cadmium poses significant risks to ecosystems, and methodologies for its removal, including adsorption, have been researched. There are several environmentally friendly adsorbing materials (such as Biochar) for Cd removal. In this study, to improve the adsorptive capacity of Cd, coconut and peanut shells were used as raw materials to prepare Biochar at 300 °C and 600 °C. The effects of the pyrolysis temperature and material type on the physicochemical properties of the adsorbents were investigated by elemental analysis, scanning electron microscopy, and Fourier transform infrared spectroscopy. Magnesium-loaded BC was synthesized to determine its Cd2+ absorptivity. The adsorption characteristics and mechanisms of Cd2+ in an aqueous phase were studied through batch adsorption experiments. The results demonstrated that the pseudo-second-order kinetics model accurately described the adsorption kinetics of adsorbents of Cd2+. The adsorption behavior of the Cd2+ adsorbent conforms to the single layer adsorption described by the Langmuir model. Adsorption of Cd2+ involves a spontaneous endothermic process. The initial pH of the solution greatly influenced the adsorption of Cd2+ and showed a trend of rapid growth and then slow growth. Thus, magnesium-modified biomass carbon has good potential for applications in pollutant remediation.

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Section: Introductionmentioning

confidence: 99%

Adsorption of cadmium by magnesium-modified biochar at different pyrolysis temperatures

Chen

Shan

Sun

2019

BioRes

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“…In support of these findings, Chen et al, showed that biochar reduced Cd bioavailability by transforming the exchangeable fraction into the residual fraction, associating these changes to increases in soil pH [36]. Wang et al [37] and Liu et al [38] both observed similar responses when using wheat straw or coconut shell biochar, respectively, to reduce Cd bioavailability. Sludge-based biochars have also been shown to decrease Pb and Cd bioavailability from 55.9% to 4.9% for Pb, and from 78.2% to 12.5% for Cd [39].…”

Section: Biochar Effects On CD and Pb In The Soil Water Soluble Phasementioning

confidence: 86%

“…Biochar (2%, w:w) has been shown to provide a positive effect on bacteria and invertebrate (such as earthworm) growth in heavy metal-contaminated agricultural soil in the short-term [2]. In a lab experiment, bacterial counts were increased by 149.4% compared with a control after 63 days following coconut shell biochar (5%, w:w) application to a Cd and Zn contaminated soil [38]. As with previous studies, in the current study, the soil microbial diversity was more greatly influenced in the short-versus long-term.…”

Section: Biochar Effects On Soil Enzyme Activity and Microbial Diversitymentioning

confidence: 99%

Short- and Long-Term Biochar Cadmium and Lead Immobilization Mechanisms

Cui

Bian

et al. 2020

Environments

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The mechanisms of soil Cd and Pb alterations and distribution following biochar (BC; 0 to 40 t ha−1) amendments applied (in either 2009 [long-term] or in 2016 [short-term]) to a contaminated rice paddy soil, and subsequent plant Cd and Pb tissue distribution over time was investigated. Water-soluble Cd and Pb concentrations decreased by 6.7–76.0% (short-term) and 10.3–88.1% (long-term) with biochar application compared to the control. The soil exchangeable metal fractions (i.e., considered more available) decreased, and the residual metal fractions (i.e., considered less available) increased with short- and long-term biochar amendments, the latter likely a function of biochar increasing pH and forcing Cd and Pb to form crystal mineral lattice associations. Biochar application reduced Cd (16.1–84.1%) and Pb (4.1–40.0%) transfer from root to rice grain, with rice Cd and Pb concentrations lowered to nearly Chinese national food safety standards. Concomitantly, soil organic matter (SOM), pH and soil water content increased by 3.9–49.3%, 0.05–0.35 pH units, and 3.8–77.4%, respectively, with increasing biochar application rate. Following biochar applications, soil microbial diversity (Shannon index) also increased (0.8–46.2%) and soil enzymatic activities were enhanced. Biochar appears to play a pivotal role in forcing Cd and Pb sequestration in contaminated paddy soils, reducing heavy metal transfer to rice grain, and potentially leading to reduced heavy metal consumption by humans.

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“…When MBC addition rate enhanced from 0 to 10%, the soil TOC grew by 47-578%, which might be due to the complexation between the metal and the oxygen-containing functional groups in the biochar (He et al, 2019). The soil CEC raised by 13-26% after MBC treatment, and this was likely to be relevant to the growing surface variation charges, which resulted from the increased pH, and resulted in the intensified adsorption affinity for cation 286 (Liu et al, 2018). It was also observed that MBC improved the physical properties of soil, as was revealed in Fig.…”

Section: The Impact Of Mbc On Soil Physicochemical Properties 271mentioning

confidence: 99%

Sorption and transport of Mn2+ in soil amended with alkali modified pomelo biochar

Zhu

et al. 2021

Preprint

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Owing to its effectiveness and environment-friendly, biochar has been used for adsorbing and immobilizing pollutants in soil in recent years of studies, which is also suitable for manganese pollution in soil caused by manganese mining and processing activities. In this research, alkali modified pomelo biochar (MBC) was regarded as a soil amendment, the improvement of soil physicochemical properties as well as Mn 2+ sorption and transport in soil by modifying with MBC were investigated. In incubation experiment, 0-10% (w/w) MBC addition amount significantly improved the physicochemical properties of soil. Due to the amelioration of soil physicochemical properties along with the oxygen-containing functional groups and the developed pore structure of MBC itself, the adsorption capacity of MBC modification soil towards Mn 2+ (q e ) was enhanced in batch adsorption experiment, and q e increased by 10-108% when MBC ratio grew from 0 to 10% at 300 mg·L -1 Mn 2+ solution. In column migration experiment, the Mn 2+ retention rate climbed by 13-106% from 0 to 10% MBC addition proportion when adopted the MBC filling way that placed MBC on the soil upper layer , and the reinforced restriction on Mn 2+ transport in soil amended with MBC might ascribe to the enhanced q e as well as the reduced saturated hydraulic conductivity. These results proved that MBC effectively augmented adsorption ability and suppressed transport of Mn 2+ in soil, which could provide an available mind on prevention and remediation of soil Mn contamination.

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Effect of modified coconut shell biochar on availability of heavy metals and biochemical characteristics of soil in multiple heavy metals contaminated soil

Cited by 211 publications

References 38 publications

Adsorption of cadmium by magnesium-modified biochar at different pyrolysis temperatures

Adsorption of cadmium by magnesium-modified biochar at different pyrolysis temperatures

Short- and Long-Term Biochar Cadmium and Lead Immobilization Mechanisms

Sorption and transport of Mn2+ in soil amended with alkali modified pomelo biochar

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