Department of Urban System Engineering, Gyeoungnam National University of Science and Technology (GNTECH), Dongjin-ro 33, Jinju, Gyeongnam 52725, Korea.
Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Chungbuk 28644, Korea.
Int J Environ Res Public Health. 2017 Dec 7;14(12):1528. doi: 10.3390/ijerph14121528.
Ginkgo trees are common street trees in Korea, and the large amounts of leaves that fall onto the streets annually need to be cleaned and treated. Therefore, fallen gingko leaves have been used as a raw material to produce biochar for the removal of heavy metals from solutions. Gingko-leaf-derived biochar was produced under various carbonization temperatures and times. This study evaluated the physicochemical properties and adsorption characteristics of gingko-leaf-derived biochar samples produced under different carbonization conditions regarding Pb(II) and Cu(II). The biochar samples that were produced at 800 °C for 90 and 120 min contained the highest oxygen- and nitrogen-substituted carbons, which might contribute to a high metal-adsorption rate. The intensity of the phosphate bond was increased with the increasing of the carbonization temperature up to 800 °C and after 90 min of carbonization. The Pb(II) and Cu(II) adsorption capacities were the highest when the gingko-leaf-derived biochar was produced at 800 °C, and the removal rates were 99.2% and 34.2%, respectively. The highest removal rate was achieved when the intensity of the phosphate functional group in the biochar was the highest. Therefore, the gingko-leaf-derived biochar produced at 800 °C for 90 min can be used as an effective bio-adsorbent in the removal of metals from solutions.
银杏树是韩国常见的街道树种，每年大量落叶需要清理和处理。因此，已将落叶银杏叶用作生产生物炭的原料，以去除溶液中的重金属。在不同的碳化温度和时间下生产了银杏叶衍生的生物炭。本研究评估了在不同碳化条件下生产的银杏叶衍生生物炭样品的物理化学性质和吸附特性，以研究 Pb(II) 和 Cu(II)。在 800°C 下碳化 90 和 120 分钟生产的生物炭样品含有最高的氧和氮取代碳，这可能有助于提高金属吸附速率。随着碳化温度升高至 800°C 和碳化 90 分钟后，磷酸键的强度增加。当银杏叶衍生的生物炭在 800°C 下生产时，Pb(II) 和 Cu(II)的吸附容量最高，去除率分别为 99.2%和 34.2%。当生物炭中磷酸官能团的强度最高时，达到了最高的去除率。因此，在 800°C 下碳化 90 分钟的银杏叶衍生生物炭可用作从溶液中去除金属的有效生物吸附剂。
