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Facile Synthesis of Cauliflower Leaves Biochar at Low Temperature in the Air Atmosphere for Cu(II) and Pb(II) Removal from Water

机译：花椰菜的容易合成在低温下在空气气氛中留下生物炭用于Cu（II）和Pb（II）从水中移除

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In this study, a facile and low-cost method for biochar (CLB) preparation from vegetable waste (cauliflower leaves) was developed at a low temperature (120 °C) in the air atmosphere. The prepared mechanism, adsorption mechanism, and performance of CLB for Cu(II) and Pb(II) sorption were investigated using Scanning electron microscopy- energy dispersive X-ray spectroscopy(SEM-EDS), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), and a series of sorption experiments. Then the CLB was subjected to single and double element sorption studies to examine the effect of pH value on the Cu(II)/Pb(II) sorption capacities and then competitive sorption priority. There are both more hydroxyl (–OH) and carboxyl (–COOH) functional groups on the surface of CLB compared to those from control (without H PO impregnation), resulting in more ion exchanges and complexation reaction for CLB with Cu(II) and Pb(II). Besides, the phosphorus-containing groups (e.g., P = OOH, P = O.), which newly formed with H PO impregnation, could also enhance sorption, especially for Pb(II), this way leaded to its adsorption and precipitation as Pb (PO ) OH crystals. The performance of maximum adsorption capacities of CLB toward Cu(II) and Pb(II) were 81.43 and 224.60 mg/g, respectively. This sorption was slightly pH-dependent, except that the sorption capacity improved significantly as the pH value of the solution increased from 2 to 4. Competitive sorption experiment confirmed that Pb(II) had a higher sorption priority than Cu(II).
机译：在本研究中，在空气气氛中的低温（120℃）的低温（120°C）中，在蔬菜废物（花椰菜叶片）中的Biochar（CLB）制备的容易和低成本方法。使用扫描电子显微镜 - 能量色散X射线光谱（SEM-EDS），X射线衍射（XRD），傅立叶来研究Cu（II）和Pb（II）和Pb（II）吸附的CLB的制备机理，吸附机理和性能。转化红外光谱（FTIR），以及一系列吸附实验。然后对CLB进行单一和双元素吸附研究，以检查pH值对Cu（II）/ Pb（II）吸附能力的影响，然后竞争吸附优先级。与来自对照（没有H PO浸渍）的那些，CLB表面上有更多的羟基（-OH）和羧基（-COOH）官能团，导致CLB的CU（II）和CLB的更多离子交换和络合反应PB（ii）。此外，新形成的含磷基团（例如，P = OOH，P = O.）也可以增强吸附，尤其是对于Pb（II），这种方式导致其吸附和降水为Pb （PO）哦晶体。 CLB的最大吸附能力朝向Cu（II）和Pb（II）的性能分别为81.43和224.60mg / g。这种吸附依赖于略微pH依赖性，除了由于溶液的pH值从2-4增加到4-4的pH值，吸附能力显着改善。竞争性吸附实验证实，Pb（II）的吸附优先级高于Cu（II）。

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