Singapore-Delft Water Alliance, National University of Singapore, Singapore 117576, Singapore.
Water Res. 2013 Sep 1;47(13):4621-9. doi: 10.1016/j.watres.2013.04.033. Epub 2013 May 9.
Graphene oxide (GO) was employed in the present study for removal of two commonly occurring algal toxins, microcystin-LR (MC-LR) and microcystin-RR (MC-RR), from water. The adsorption performance of GO was compared to that of commercially available activated carbon. Further, adsorption experiments were conducted in the presence of other environmental pollutants to understand the matrix effects of contaminated water on the selective adsorption of MC-LR and MC-RR onto GO. The environmental pollutants addressed in this study included different anions (nitrate NO3-, nitrite NO2-, sulphate SO4(2-), chloride (Cl(-)), phosphate PO4(3-) and fluoride (F(-))) and cations (sodium (Na(+)), potassium (K(+)), magnesium (Mg(2+)) and calcium (Ca(2+))). GO showed very a high adsorption capacity of 1700 μg/g for removal of MC-LR and 1878 μg/g for MC-RR while the maximum adsorption capacity obtained with the commercial activated carbon was 1481.7 μg/g and 1034.1 μg/g for MC-LR and MC-RR, respectively. The sorption kinetic experiments revealed that more than 90% removal of both MC-LR/RR was achieved within 5 min for all the doses studied (500, 700 and 900 μg/L). GO could be reused as an adsorbent following ten cycles of adsorption/desorption with no significant loss in its adsorption capacity.
氧化石墨烯（GO）被用于本研究中，以去除水中两种常见的藻类毒素，微囊藻毒素-LR（MC-LR）和微囊藻毒素-RR（MC-RR）。GO 的吸附性能与市售活性炭进行了比较。此外，还在存在其他环境污染物的情况下进行了吸附实验，以了解受污染水对 MC-LR 和 MC-RR 选择性吸附到 GO 上的基质效应。本研究中涉及的环境污染物包括不同的阴离子（硝酸盐 NO3-、亚硝酸盐 NO2-、硫酸盐 SO4(2-)、氯离子 (Cl(-))、磷酸盐 PO4(3-)和氟化物 (F(-)))和阳离子（钠 (Na(+))、钾 (K(+))、镁 (Mg(2+))和钙 (Ca(2+))）。GO 对 MC-LR 的去除具有非常高的吸附容量，为 1700μg/g，对 MC-RR 的去除容量为 1878μg/g，而商用活性炭的最大吸附容量分别为 1481.7μg/g 和 1034.1μg/g。吸附动力学实验表明，对于所有研究剂量（500、700 和 900μg/L），在 5 分钟内，超过 90%的 MC-LR/RR 被去除。GO 可以在十次吸附/解吸循环后作为吸附剂重复使用，而其吸附容量没有明显损失。
