Department of Food Science and Technology, Virginia Polytechnic Institute and State University, 1230 Washington St. SW, Blacksburg, VA, 24061, USA.
Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, MO, 63130, USA.
Environ Res. 2020 Jul;186:109442. doi: 10.1016/j.envres.2020.109442. Epub 2020 Apr 1.
Grape pomace (GP) management has been a challenge worldwide. We have previously demonstrated a biorefinery process to recover oil and polyphenols, and produce biofuels from GP sequentially, although over 50% of GP solid waste remains post-processing. To approach zero solid waste during GP processing, herein a pyrolysis process was designed for converting GP and its secondary processing wastes to biochars, which were then evaluated for lead (Pb) adsorption from water. GP lignin pyrolyzed at 700 °C (GPL2 biochar) with specific surface area of 485 m/g showed the highest Pb adsorption capacity, and achieved 66.5% of Pb removal from an initially high concentration of 300 mg/L within 30 min. At low initial Pb concentrations (50-3000 μg/L), GPL2 biochar could reduce Pb concentrations to 0.208-77.2 μg/L. In addition, experimental and modeling results revealed that both physisorption and chemisorption mechanisms were involved in the adsorption process of GPL2 biochar.
葡萄渣（GP）的管理在全球范围内一直是一个挑战。我们之前已经展示了一种生物炼制工艺，该工艺可以从 GP 中顺序回收油和多酚，并生产生物燃料，尽管加工后仍有超过 50%的 GP 固体废弃物。为了在 GP 处理过程中实现零固体废弃物，本文设计了一种热解工艺，用于将 GP 和其二次加工废物转化为生物炭，然后评估这些生物炭从水中吸附铅（Pb）的能力。在 700°C 下热解的 GP 木质素（GPL2 生物炭）比表面积为 485 m/g，表现出最高的 Pb 吸附能力，在 30 分钟内可从初始浓度为 300mg/L 的高浓度中去除 66.5%的 Pb。在初始 Pb 浓度较低（50-3000μg/L）时，GPL2 生物炭可将 Pb 浓度降低至 0.208-77.2μg/L。此外，实验和模型结果表明，GPL2 生物炭的吸附过程涉及物理吸附和化学吸附两种机制。
