Department of Agricultural and Biological Engineering & Texas A&M AgriLife Research Center at Stephenville, Texas A&M University, USA.
Department of Agricultural and Biological Engineering & Texas A&M AgriLife Research Center at Stephenville, Texas A&M University, USA; Department of Wildlife, Sustainability, and Ecosystem Sciences, Tarleton State University, USA.
Bioresour Technol. 2019 Feb;274:162-172. doi: 10.1016/j.biortech.2018.11.081. Epub 2018 Nov 23.
The biochars derived from alfalfa (AF) and bermudagrass (BG), the abundant grass hays to cows, were prepared, characterized and used for removal of tetracycline (TC) in water. The alfalfa-derived biochar (AF-BC) has exhibited outstanding TC adsorption capacity (372 mg/g), which was about 8-fold higher than that of bermudagrass-derived biochar (BG-BC). In addition, the TC adsorption capacity of AF-BC was comparable with those of the commercial activated carbons under the same conditions. The surface structure, chemistry and high ash contents of AF-BC suggested the hydrogen bonding, electrostatic interactions and surface complexation between AF-BC and TC. Furthermore, hydroxyapatite (HAP; Ca(PO)OH) and calcite (CaCO) on the surface of AF-BC may also contribute to adsorption of TC via surface complexation, hydrogen bonding and electrostatic interactions. The alkaline desorption-driven regeneration of TC-spent AF-BC led to effective adsorption-desorption for multiple cycles, which indicated AF-BC could be a cost-effective adsorbent for TC in water and wastewater.
以奶牛的丰富草料苜蓿（AF）和百慕大草（BG）为原料制备、表征并用于去除水中的四环素（TC）。苜蓿衍生生物炭（AF-BC）表现出优异的 TC 吸附能力（372mg/g），约为百慕大草衍生生物炭（BG-BC）的 8 倍。此外，在相同条件下，AF-BC 的 TC 吸附能力可与商业活性炭相媲美。AF-BC 的表面结构、化学性质和高灰分含量表明，AF-BC 与 TC 之间存在氢键、静电相互作用和表面络合。此外，AF-BC 表面的羟基磷灰石（HAP；Ca(PO)OH）和方解石（CaCO）也可能通过表面络合、氢键和静电相互作用促进 TC 的吸附。碱性解吸驱动的 TC 耗尽 AF-BC 的再生导致多次有效吸附-解吸循环，表明 AF-BC 可作为水中 TC 的一种具有成本效益的吸附剂。
