Applications of Biochar and Modified Biochar in Heavy Metal Contaminated Soil: A Descriptive Review

Liang, Mingkun; Li, Lin; He, Huijun; Li, Jingxi; Zhu, Zongqiang; Zhu, Yinian

doi:10.3390/su132414041

Cited by 69 publications

(26 citation statements)

References 122 publications

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“…The latter involves the direct addition of metal or metal oxide reagents to the feedstock. Then, pyrolysis, chemical precipitation, and activation are performed to complete the modification [ 86 ]. In situ synthesis has two major advantages over impregnation.…”

Section: Modification Of Rice Husk Biocharmentioning

confidence: 99%

Review on Rice Husk Biochar as an Adsorbent for Soil and Water Remediation

Zheng

et al. 2023

Plants

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Rice husk biochar (RHB) is a low-cost and renewable resource that has been found to be highly effective for the remediation of water and soil environments. Its yield, structure, composition, and physicochemical properties can be modified by changing the parameters of the preparation process, such as the heating rate, pyrolysis temperature, and carrier gas flow rate. Additionally, its specific surface area and functional groups can be modified through physical, chemical, and biological means. Compared to biochar from other feedstocks, RHB performs poorly in solutions with coexisting metal, but can be modified for improved adsorption. In contaminated soils, RHB has been found to be effective in adsorbing heavy metals and organic matter, as well as reducing pollutant availability and enhancing crop growth by regulating soil properties and releasing beneficial elements. However, its effectiveness in complex environments remains uncertain, and further research is needed to fully understand its mechanisms and effectiveness in environmental remediation.

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Section: Modification Of Rice Husk Biocharmentioning

confidence: 99%

Review on Rice Husk Biochar as an Adsorbent for Soil and Water Remediation

Zheng

et al. 2023

Plants

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“…Another type of carbonaceous material is biochar (BC), with abundant internal pores and negative charges on the surface (Lou et al, 2016). This is prepared from various types of biowaste materials under low pyrolysis temperature and anoxic conditions (Liang et al, 2021). Compared with AC, BC is cheaper to produce and has a stronger affinity.…”

Section: Carbonaceous Materialsmentioning

confidence: 99%

Reaction medium for permeable reactive barrier remediation of groundwater polluted by heavy metals

Liu

2022

Front. Environ. Sci.

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Heavy metal pollution of groundwater has a serious impact on human health, which has become a key issue in the field of water resources and water environment. Permeable reactive barrier (PRB) is an in-situ remediation technology for passive groundwater pollution, with the advantages of economy and efficiency. The reaction material in the PRB wall is the key to the whole system, which can intercept or degrade heavy metals to achieve the removal of pollutants. Among a wide variety of reaction materials, PRB has been successfully used to remove various heavy metal contaminants. In this paper, reaction materials are classified into three broad categories, namely single material, mixed material, and composite material. On this basis, the action mechanism of various materials to remove heavy metal pollutants is analyzed, and the screening method of reaction medium is summarized. Finally, the deficiencies and development directions of PRB reaction medium materials in the removal of heavy metals in groundwater are pointed out, providing reference for the subsequent development and application of PRB reaction medium.

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“…Moreover, BC also possesses excellent physiochemical characteristics including porous structure, hydroxyl and carbonyl groups which play an imperative role in the degradation of HMs (Zhu et al, 2015). BC is considered to be an economical, environmentally friendly and superior quality amendment to remediate HMs contaminated soils (Liang et al, 2021). BC substantially mobilize the HMs thereby reduce the uptake and subsequent accumulation in plants (Meng et al, 2018).…”

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

“…The mineral present in BC also form insoluble precipitates with fix the HMs and reduce their availability and mobility in soil (Cao and Harris, 2010). For instance, inorganic P present in BC induced the precipitation of Pb and reduced its mobility and availability (Liu et al, 2016;Liang et al, 2021).…”

Section: Introduction Introduction Introduction Introductionmentioning

confidence: 99%

Biochar: A promising soil amendment to mitigate heavy metals toxicity in plants

Tang

WANG

Liu

et al. 2022

Not Bot Horti Agrobo

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Heavy metals (HMs) toxicity is serious abiotic stress that is significantly reducing crop productivity and posing a serious threat to human health, soil and environmental quality. Therefore, it is urgently needed to find appropriate measures to mitigate the adverse impacts of HMs on soil, plants, humans and the environment. Biochar (BC) has emerged as an excellent soil amendment to minimize the adverse impacts of HMs and to improve soil fertility and environmental quality. Biochar application decreases HMs uptake and their translocation to plant parts by forming complexes and precipitation. Biochar also has improved soil pH, soil fertility and soil cation exchange capacity (CEC) and it also increases adsorption of HMs thus reduces their mobility and subsequent availability to plants. BC application also maintains membrane stability and improves uptake of nutrients, osmolytes accumulation, antioxidant activities, and gene expression, therefore, improves the plant performance under HMs stress. Biochar application also improves the photosynthetic performance by increasing the synthesis of photosynthetic pigments, stomata conductance and increasing the water uptake by plants. Besides this, BC also scavenges ROS by increasing the antioxidant activities, gene expression, and accumulation of proline in HMs contaminated soils. This review highlights the role of BC to mitigate the HMs toxicity in plants. We have discussed the role of BC in the modification of soil properties to induce tolerance against HMs toxicity. Moreover, we have discussed various mechanisms mediated by BC at the plant level to induce tolerance against HMs. Additionally, we also identified research gaps that must be fulfilled in future research studies.

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Applications of Biochar and Modified Biochar in Heavy Metal Contaminated Soil: A Descriptive Review

Cited by 69 publications

References 122 publications

Review on Rice Husk Biochar as an Adsorbent for Soil and Water Remediation

Review on Rice Husk Biochar as an Adsorbent for Soil and Water Remediation

Reaction medium for permeable reactive barrier remediation of groundwater polluted by heavy metals

Biochar: A promising soil amendment to mitigate heavy metals toxicity in plants

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