High-Efficiency Reclaiming Phosphate from an Aqueous Solution by Bentonite Modified Biochars: A Slow Release Fertilizer with a Precise Rate Regulation,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

High-Efficiency Reclaiming Phosphate from an Aqueous Solution by Bentonite Modified Biochars: A Slow Release Fertilizer with a Precise Rate Regulation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-03-27 , DOI: 10.1021/acssuschemeng.0c01112
Xiongfang An ₁ , Zhansheng Wu _{1,

2} , Junzhi Yu ₁ , Linhan Ge ₃ , Tao Li ₁ , Xiaochen Liu ₂ , Bing Yu ₄

Affiliation

Biochar can be used to reclaim nutrients from wastewater, and the nutrient loaded biochar can be regarded as a slow release fertilizer; however, the prerequisite of this concept is that the used biochar should have high adsorption capacities for nutrients. In addition, it remains challenging to tune the release rate of nutrients to coordinate with the uptake rate of plants. Herein, we report bentonite modified biochars derived from the copyrolysis of biomass and bentonite, which exhibit much higher phosphate adsorption capacities and superior P-slow release kinetics compared to that of the biochar without the modification of bentonite. The mechanistic study reveals that the improved adsorption and release performance of the as-prepared biochars originates from the presence of Ca and Mg in bentonite which leads to (1) the formation of desirable porous structure, (2) the reduced negative charge on the surface of the derived biochars, and (3) the formation of Ca and Mg related precipitations. Moreover, we demonstrate that the P-release kinetics of the as-prepared biochars can be precisely tuned by controlling the amount of bentonite, and a modified Fick model is developed to establish a quantitative relationship between biochars with different formulations and their P-release kinetics.

中文翻译：

膨润土改性生物炭从水溶液中高效回收磷酸盐：具有精确速率调节的缓释肥料

生物炭可用于从废水中回收养分，养分负载的生物炭可被视为缓释肥料。但是，该概念的前提是所用生物炭应具有较高的养分吸附能力。另外，调节营养物质的释放速率以与植物的吸收速率协调仍然具有挑战性。在此，我们报道了由生物质和膨润土的共分解衍生的膨润土改性生物炭，与未经膨润土改性的生物炭相比，它们显示出更高的磷酸盐吸附能力和优异的P缓释动力学。机理研究表明，制备的生物炭的吸附和释放性能得到改善，这是由于膨润土中存在钙和镁而导致的（1）形成理想的多孔结构，（2）减少了表面上的负电荷。（3）与钙和镁有关的沉淀物的形成。此外，我们证明可以通过控制膨润土的量来精确调节所制备生物炭的P释放动力学，并开发了改进的Fick模型以建立具有不同配方的生物炭与其P释放动力学之间的定量关系。。

更新日期：2020-04-23

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11