In this study, the nanocomposites from biomass (soybean straw) and layered double hydroxides (LDHs), denoted as B/LDHs, were fabricated using the mechanical-hydrothermal method. The obtained B/LDHs nanocomposites were characterized by TEM, SEM, FT-IR, and N 2 adsorption–desorption techniques. Adsorption of the heavy-metal ions Pb( ii ) on the B/LDHs was determined at 25°C and pH 6.0 using a batch technique. The experimental results demonstrated that biomass contributed to the sorption process. The pseudo-second-order, Langmuir, and Freundlich models well fitted the sorption process, indicating chemisorption and monolayer adsorption were the main adsorption mechanisms. Meanwhile, it is found that there is an obvious effect of adsorbent concentration in the studied adsorption system. In comparison with soybean straw and Mg–Al LDHs, the B/LDHs nanocomposites exhibit significantly enhanced sorption capacities. It is evident from this study that the construction of B/LDHs nanocomposites is an effective strategy for improving the sorption capacity of LDHs, and the modified LDH-based adsorbent shows a good potential in the removal of heavy metals from water. More importantly, it solves the problem of a large number of agricultural waste disposals. And, it achieved the goal of a win-win situation.

中文翻译：

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LDHs改性固体吸附剂制备大豆秸秆复合材料去除水样中的Pb(ii)

在这项研究中，使用机械水热法制造了来自生物质（大豆秸秆）和层状双氢氧化物（LDHs）的纳米复合材料，表示为 B/LDHs。通过TEM、SEM、FT-IR和N 2 吸附-解吸技术对获得的B/LDHs纳米复合材料进行表征。重金属离子 Pb(ii) 在 B/LDH 上的吸附是在 25°C 和 pH 6.0 下使用分批技术测定的。实验结果表明，生物质有助于吸附过程。伪二阶、Langmuir 和 Freundlich 模型很好地拟合了吸附过程，表明化学吸附和单层吸附是主要的吸附机制。同时发现，在所研究的吸附体系中，吸附剂浓度有明显的影响。与大豆秸秆和 Mg-Al LDHs 相比，B/LDHs 纳米复合材料表现出显着增强的吸附能力。本研究表明，构建 B/LDHs 纳米复合材料是提高 LDHs 吸附能力的有效策略，改性 LDH 基吸附剂在去除水中重金属方面表现出良好的潜力。更重要的是，它解决了大量农业废弃物处理的问题。并且，达到了双赢的目的。解决了大量农业废弃物处理的问题。并且，达到了双赢的目的。解决了大量农业废弃物处理的问题。并且，达到了双赢的目的。