Biochars as media for air pollution control systems: Contaminant removal, applications and future research directions

Gwenzi, Willis; Chaukura, Nhamo; Wenga, Terrence; Mtisi, Munyaradzi

doi:10.1016/j.scitotenv.2020.142249

Cited by 91 publications

(39 citation statements)

References 138 publications

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“…This is achieved through biochar's ability to reduce the bioavailability of nitrogen to soil microorganisms for their metabolic activities [47]. The removal of gaseous mercury has also been achieved using biochar [48]. Several research reports show that, biochar surfaces are usually negatively charge thus have high affinity for positively charged metal ions [48] including Hg 2+.…”

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

“…The removal of gaseous mercury has also been achieved using biochar [48]. Several research reports show that, biochar surfaces are usually negatively charge thus have high affinity for positively charged metal ions [48] including Hg 2+. Removal efficiency usually depend on biochar properties (surface and elemental properties), feedstock and pyrolysis conditions under which biochar was prepared [48].…”

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

“…Several research reports show that, biochar surfaces are usually negatively charge thus have high affinity for positively charged metal ions [48] including Hg 2+. Removal efficiency usually depend on biochar properties (surface and elemental properties), feedstock and pyrolysis conditions under which biochar was prepared [48]. Though biochar can be used to reduce CO 2 emissions, it has low affinity for CO 2 and thus requires modifications for effective CO 2 capture [48].…”

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

“…Removal efficiency usually depend on biochar properties (surface and elemental properties), feedstock and pyrolysis conditions under which biochar was prepared [48]. Though biochar can be used to reduce CO 2 emissions, it has low affinity for CO 2 and thus requires modifications for effective CO 2 capture [48]. One modification method is impregnating biochar with nitrogen and this improves biochar removal of CO 2 of up to 55% [49].…”

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

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Sustainable Use of Biochar in Environmental Management

Abukari¹,

Imoro²,

Imoro³

et al. 2021

Environmental Health

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Conversion of agricultural wastes into eco-friendly and low cost biochar is not only a smart recycling strategy but a panacea to environmental pollution management. Agricultural wastes biochar can be an effective alternative technique for controlling contaminants due to its low cost, high-efficiency, simple to use, ecological sustainability and reliability in terms of public safety. Biochars have made substantial breakthroughs in reducing greenhouse gases emissions, reducing soil nutrient leaching, sequester atmospheric carbon into the soil, increasing agricultural productivity, and reducing bioavailability of environmental contaminants. Recent advances in the understanding of biochars warrant a proper scientific evaluation of the relationship between its properties and impact on soil properties, environmental pollutant remediation, plant growth, yield, and resistance to biotic and abiotic stresses. The main factors controlling biochar properties include the nature of feedstock, heat transfer rate, residence time and pyrolysis temperature. Biochar efficacy in pollutants management largely depends on its elemental composition, ion-exchange capacity, pore size distribution and surface area, which vary with the nature of feedstock, preparation conditions and procedures. The chapter explored the possibility of using biochar from agricultural wastes as a suitable alternative for the remediation of environmental pollutants, soil conditioning and the long-term biochar application in the environment.

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Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

Section: Role Of Biochar In Pollution Managementmentioning

confidence: 99%

See 2 more Smart Citations

Sustainable Use of Biochar in Environmental Management

Abukari¹,

Imoro²,

Imoro³

et al. 2021

Environmental Health

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“…Biochar is mainly a product of biomass, which could be produced through thermochemical conversion processes such as torrefaction, slow or fast pyrolysis and gasification under various process parameters (Leng et al 2019). Biochar is low-cost and renewable biomaterial with several applications C-sequestration and mitigation of greenhouse gas emissions, soil amendment, and removal of both inorganic and organic contaminants in aqueous systems (Gwenzi et al 2021). Biochar is considered as a promising strategy to produce energy, sequester carbon, increase the productivity of soils and improve soil and environmental quality (Table 2).…”

Section: Biochar As An Agro-wastementioning

confidence: 99%

Agricultural Waste and its Nano-Management: Mini Review

et al. 2020

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A GRICULTURAL wastes are considered residues resulted during the agricultural production and after harvesting fruit and vegetable and their processing, agro-industrial by/co-products from the grapes, banana, olives and milk processing. These wastes may represent a treasure when they are turning into valuable applications (i.e., composts, biochar, adsorbents for removing pollutants from the environment and organic fertilizers) instead of burning it in open fields causing several environmental problems such as soil degradation and air pollution. The landfill disposal and open dumping of agro-wastes is a common practice in the developing countries generating huge amounts of ash, which may create serious health and environmental problems, primarily due to pollution of groundwater. Under the umbrella of the green bioeconomy and based on industrial innovation and high technology, new and better approaches for the recovery of agricultural wastes have been developed. This has contributed to guaranteeing sustainable production and its consumption, resource utilizing efficiency, the conversation of these wastes into valuable products and the reduction of negative environmental impacts.The common management of Agro-wastes may include a lot of suggested uses such as the production of biosynthesis of nanoparticles, biotechnological products, composting and biofuel production. Furthermore, a lot of bioactive compounds could be produced from the agrowastes, which have many application possibilities such as functional food, pharmaceutical and cosmetic approaches. The nano-management of agro-wastes may include using nanotechnology to convert the agro-wastes into a valuable product. This topic still has several open questions, particularly under sustainable and green bioeconomy prespective.

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