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Surface properties and suspension stability of low-temperature pyrolyzed biochar nanoparticles: Effects of solution chemistry and feedstock sources.
Chemosphere ( IF 8.8 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.chemosphere.2020.127510
Chen-Yang Xu 1 , Qi-Rui Li 2 , Zeng-Chao Geng 1 , Fei-Nan Hu 3 , Shi-Wei Zhao 3
Affiliation  

Intensive application of biochar requires better understanding of their environmental behaviors such as stability, fate, and mobility. The release of bulk biochar into biochar nanoparticles (NPs) may bring risks because of their potential flowing into downstream water bodies with nutrients/containments attached. Low-temperature pyrolyzed biochars, namely fruit tree branch biochar of 350/450/550 °C (FB350, FB450 and FB550), corn straw biochar of 350 °C (CB350) and peanut straw biochar of 350 °C (PB350), were produced, and their NPs were extracted. The yield, elemental composition, mineral composition, surface functional groups and zeta potential of biochar NPs were characterized. Subsequently their suspension stability was evaluated in NaCl and CaCl2 solutions by dynamic light scattering technique. The Hamaker constants and particle interaction energy of the biochar NPs were calculated by adopting Derjaguin–Landau–Verwey–Overbeek theory. For biochar NPs of same feedstock, the stability of FB350/450/550-NPs could be predicted well by their zeta potential values. The types of their surface functional groups were the same while their adsorption intensity differed. The scenarios for biochar NPs of different feedstock sources were different, that is, inconsistent variation was observed between their zeta potential and suspension stability, which were rooted in the variable type and quantity of surface functional groups. In conclusion, feedstock was the most significant factor that influenced the suspension stability of biochar NPs, followed by the pyrolysis temperature and solution chemistry, which were highly dependent on surface potential. The findings provide references for the environmental risk evaluation of biochar NPs and reasonable application of biochar in field.



中文翻译:

低温热解生物炭纳米颗粒的表面性质和悬浮液稳定性:溶液化学和原料来源的影响。

大量使用生物炭需要更好地了解其环境行为,例如稳定性,命运和移动性。将大量生物炭释放到生物炭纳米颗粒(NPs)中可能会带来风险,因为它们有可能流入附有营养物质/污染物的下游水体。低温热解生物炭为350/450/550°C的果树分支生物炭(FB350,FB450和FB550),350°C的玉米秸秆生物炭(CB350)和350°C的花生秸秆生物炭(PB350)生产,并提取其NP。表征了生物炭NPs的产率,元素组成,矿物质组成,表面官能团和ζ电位。随后在NaCl和CaCl 2中评估其悬浮稳定性动态光散射技术解决方案。采用Derjaguin–Landau–Verwey–Overbeek理论计算生物炭NP的Hamaker常数和粒子相互作用能。对于相同原料的生物炭NP,FB350 / 450 / 550-NP的稳定性可以通过其ζ电位值很好地预测。它们的表面官能团的类型相同,而它们的吸附强度不同。不同原料来源的生物炭NPs的情况不同,也就是说,它们的Zeta电位和悬浮液稳定性之间观察到不一致的变化,这是由于表面官能团的类型和数量不同所致。总之,原料是影响生物炭NPs悬浮稳定性的最重要因素,其次是热解温度和溶液化学,它们高度依赖于表面电势。研究结果为生物炭NPs的环境风险评价和生物炭在野外的合理应用提供参考。

更新日期:2020-07-07
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