Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, School of Environmental Ecology and Biological Engineering, Donghu New & High Technology Development Zone, Wuhan Institute of Technology, No. 206, Guanggu 1st Road, Wuhan, 430205, Hubei Province, People's Republic of China.
Hubei Three Gorges Laboratory, Yichang, 443007, China.
Environ Sci Pollut Res Int. 2024 May;31(21):31605-31618. doi: 10.1007/s11356-024-33320-y. Epub 2024 Apr 19.
For the serious situation of heavy metal pollution, the use of cheap, clean, and efficient biochar to immobilize heavy metals is a good treatment method. In this paper, SA@ZIF-8/BC was prepared for the adsorption of Pb in solution using sodium alginate (SA) and zeolitic imidazolate framework-8 (ZIF-8) modified corn cob biochar. The results showed that the specific surface area of modified biochar was greatly improved, with good adsorption capacity for Pb, strong anti-interference ability, and good economy. At the optimal adsorption pH of 5, the adsorption model of Pb by SA@ZIF-8/BC was more consistent with the pseudo-second-order kinetic model and Langmuir isotherm model. This indicates that the adsorption of Pb by SA@ZIF-8/BC is chemisorption and monolayer adsorption. The maximum adsorption of modified biochar was 300 mg g, which was 2.38 times higher than that of before modified BC (126 mg g). The shift in binding energy of functional groups before and after adsorption of SA@ZIF-8/BC was studied by XPS, and it was found that hydroxyl and carboxyl groups played an important role in the adsorption of Pb. It was demonstrated that this novel adsorbent can be effectively used for the treatment of Pb pollution in wastewater.
针对重金属污染的严重情况，利用廉价、清洁、高效的生物炭固定重金属是一种很好的处理方法。本文采用海藻酸钠（SA）和沸石咪唑酯骨架-8（ZIF-8）改性玉米芯生物炭制备 SA@ZIF-8/BC，用于溶液中 Pb 的吸附。结果表明，改性生物炭的比表面积得到了很大的提高，对 Pb 具有良好的吸附能力、较强的抗干扰能力和良好的经济性。在最优吸附 pH 为 5 时，SA@ZIF-8/BC 对 Pb 的吸附模型更符合准二级动力学模型和 Langmuir 等温吸附模型。这表明 SA@ZIF-8/BC 对 Pb 的吸附是化学吸附和单层吸附。改性生物炭的最大吸附量为 300mg/g，比改性前的 BC（126mg/g）提高了 2.38 倍。通过 XPS 研究了 SA@ZIF-8/BC 吸附前后官能团结合能的变化，发现羟基和羧基在 Pb 的吸附中起重要作用。证明了这种新型吸附剂可有效用于处理废水中的 Pb 污染。
