Synthesis and environmental applications of biochar-supported nano-zero-valent iron composites: a review

Zhong, Xinlian; Lai, Yujian; Wang, Xuemei; Wang, Menglu; Han, Wei; Zhang, Meng; Ji, Hongbing

doi:10.1007/s10311-024-01712-8

Cited by 3 publications

(7 citation statements)

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“…The undetected contents by elemental composition in the biochar were considered to be associated with mineral elements including Si, Al, Fe, etc. [23]. We performed an analysis of the inorganic substances using powder X-ray diffraction.…”

Section: Elemental Compositionmentioning

confidence: 99%

“…In anaerobic or hypoxic environments, pyrolysis technology can eliminate harmful substances such as pathogens and fix heavy metals through high-temperature treatment from 300 to 1000 °C [21]. In addition, the pyrolysis process can also produce biochar (solids) and bio-oil (condensed liquids) [22,23]. Pyrolysis mainly includes two main technical paths, which are operated at high pyrolysis temperature and low pyrolysis temperature, respectively [15,23].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the pyrolysis process can also produce biochar (solids) and bio-oil (condensed liquids) [22,23]. Pyrolysis mainly includes two main technical paths, which are operated at high pyrolysis temperature and low pyrolysis temperature, respectively [15,23]. Biochar produced in a treated process at a low pyrolysis temperature (<700 °C) could increase the yield of biochar, which has broad application prospects [21,24].…”

Section: Introductionmentioning

confidence: 99%

“…Due to its excellent pore structure, large surface area, and abundant organic functional groups on the surface, biochar is often used as an adsorbent, soil amendment, and biochar fertilizer [24,25]. The biochar produced from sludge has been successfully used as a soil amendment, which aims to increase the soil pH, enhance soil basal respiration and enzyme activity, and significantly create more favorable conditions for crop growth [23]. A prior study indicated that the biochar based on sludge exhibited an efficient removal effect of hexavalent chromium in soil, further proving its feasibility in land use [28,29].…”

Section: Introductionmentioning

confidence: 99%

“…The preparation of biochar using pure sludge exhibits a relatively low adsorption amount of iodine in an aqueous solution [32]. Thus, the addition of other carbon substances to sludge before the pyrolysis process could improve the adsorption amount of iodine in aqueous solutions by biochar [23,30,32]. The garden waste from urban green spaces is a good source of carbon material, which can be mixed with sludge to prepare biochar with high adsorption amounts of iodine in an aqueous solution [34,35].…”

Section: Introductionmentioning

confidence: 99%

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Sorption of Iodine on Biochar Derived from the Processing of Urban Sludge and Garden Waste at Different Pyrolysis Temperatures

Bai,

Liu,

et al. 2024

Molecules

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The United Nations proposed the Sustainable Development Goals with the aim to make human settlements in cities resilient and sustainable. The excessive discharge of urban waste including sludge and garden waste can pollute groundwater and lead to the emission of greenhouse gases (e.g., CH4). The proper recycling of urban waste is essential for responsible consumption and production, reducing environmental pollution and addressing climate change issues. This study aimed to prepare biochar with high adsorption amounts of iodine using urban sludge and peach wood from garden waste. The study was conducted to examine the variations in the mass ratio between urban sludge and peach wood (2/1, 1/1, and 1/2) as well as pyrolysis temperatures (300 °C, 500 °C, and 700 °C) on the carbon yield and adsorption capacities of biochar. Scanning electron microscopy, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectrometry, powder X-ray diffraction, and elemental analysis were used to characterize the biochar produced at different pyrolysis temperatures and mass ratios. The results indicate that the carbon yield of biochar was found to be the highest (>60%) at a pyrolysis temperature of 300 °C across different pyrolysis temperatures. The absorbed amounts of iodine in the aqueous solution ranged from 86 to 223 mg g−1 at a mass ratio of 1:1 between urban sludge and peach wood, which were comparably higher than those observed in other mass ratios. This study advances water treatment by offering a cost-effective method by using biochar derived from the processing of urban sludge and garden waste.

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Section: Elemental Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%