Ministry of Forestry Bioethanol Research Center, School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China.
State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China.
Bioresour Technol. 2022 Dec;365:128146. doi: 10.1016/j.biortech.2022.128146. Epub 2022 Oct 17.
Removing non-biodegradable Pb and Cu is the top priority in wastewater purification, while adsorption is a green technology to remove them. Herein, MgO-embedded granular hierarchical porous biochar (HP-MgO@BC) was fabricated by pyrolysis of porous Mg-infused chitosan beads. MgO nanoparticles were homogeneously embedded throughout the hierarchical porous biochar matrix in a high-density and accessible manner, thus providing a large number of easily accessible adsorption sites. Pb and Cu sorption capacities on HP-MgO@BC are 1044.8 and 811.2 mg/g at pH 5, respectively. It could effectively remove Pb and Cu across a broad pH range of 2-7, and show excellent adsorption efficiency in the presence of interfering cations. It also possessed excellent reusability. In the fixed-bed operation, 7880 BV (78.80 L) and 1610 BV (16.10 L) of synthetic Pb and Cu wastewater could be purified by HP-MgO@BC packed column, respectively. The adsorption mechanism involves mineral precipitation, ion exchange, and surface coordination.
去除不可生物降解的 Pb 和 Cu 是废水净化的重中之重，而吸附是去除它们的绿色技术。在此，通过多孔 Mg 浸渍壳聚糖珠的热解制备了嵌入 MgO 的颗粒状分级多孔生物炭（HP-MgO@BC）。MgO 纳米颗粒均匀地嵌入到分级多孔生物炭基质中，以高密度和可及的方式，从而提供了大量易于接近的吸附位点。在 pH 5 时，HP-MgO@BC 对 Pb 和 Cu 的吸附容量分别为 1044.8 和 811.2 mg/g。它可以在 pH 值为 2-7 的宽范围内有效地去除 Pb 和 Cu，并且在存在干扰阳离子的情况下表现出优异的吸附效率。它还具有出色的可重复使用性。在固定床操作中，分别用 HP-MgO@BC 填充柱可净化 7880 BV（78.80 L）和 1610 BV（16.10 L）的合成 Pb 和 Cu 废水。吸附机制涉及矿物沉淀、离子交换和表面配位。
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