The role of ash content on bisphenol A sorption to biochars derived from different agricultural wastes
The role of ash content on bisphenol A sorption to biochars derived from different agricultural wastes
复制标题
灰分含量对不同农业废弃物生物炭吸附双酚A的作用
DOI：
10.1016/j.chemosphere.2016.12.041
复制
发表时间：
2017-03-01
期刊：
影响因子：
8.8
通讯作者：
Pan, Bo
中科院分区：
文献类型：
--
作者：
Li, Jing;Liang, Ni;Pan, Bo
无机矿物质是生物炭的重要组成部分，但其在生物炭功能中的作用研究较少，限制了对生物炭应用的认识。本研究利用不同的生物质制备生物炭。它们的性能以及双酚A（BPA）的吸附进行了研究，主要集中在无机成分的作用。草酸盐，碳酸盐，以及KCl晶体中观察到的生产的生物炭取决于原料和温度。草酸盐和KCl在相对低的温度（200-300 ℃）下形成，而碳酸盐通常在高于400 ℃的热解温度下形成。分离的不溶性晶体颗粒和溶解的盐对BPA的表观吸附贡献有限，但灰分含量的去除改变了BPA的吸附。无机组分对BPA吸附的潜在影响可能与生物炭的性质有关。基于生物炭表征和脱灰前后的吸附比较，我们提出生物炭颗粒中无机矿物成分的形成可能堵塞了内部孔隙，从而限制了这些吸附位点的意义。结果表明，BPA与生物炭的相互作用主要取决于生物炭表面的官能团。酸处理去除了大部分的无机成分，暴露出更多的吸附位点，从而增加了BPA的吸附。如果能够提高内孔的可接近性，则生物炭的吸附能力可以进一步增加。(C)2016爱思唯尔有限公司版权所有。
Inorganic minerals are important compositions in biochars, but their roles in biochar functions are investigated limitedly, which restricted our understanding on biochar applications. This study applied different biomasses to produce biochars. Their properties as well as sorption to bisphenol A (BPA) were studied, with a major focus on the role of inorganic compositions. Oxalates, carbonates, as well as KCl crystals were observed in the produced biochars depending on the feedstocks and temperatures. Oxalates and KCl formed at relatively low temperature (200-300 degrees C), while carbonates generally formed at pyrolysis temperature above 400 degrees C. The separated insoluble crystal particles and the dissolved salts have limited contribution to the apparent BPA sorption, but ash content removal altered BPA sorption. The potential impact of inorganic composition to BPA sorption should be resulted from biochar properties. Based on biochar characterization and sorption comparison before and after ash removal, we proposed that the formation of inorganic mineral compositions in biochar particles may have blocked the inner pores, which limited the significance of these sorption sites. As a result, the interactions of BPA and biochars were mostly determined by biochar surface functional groups. The acid treatment removed most of the inorganic compositions, and exposed more sorption sites, which consequently increased BPA sorption. Biochar sorption capacity may be further increased if the accessibility of the inner pores could be enhanced. (C) 2016 Elsevier Ltd. All rights reserved.