An oxidized biochar was prepared using long-root Eichhornia crassipes through an aerobic/anaerobic hybrid calcination to recycle its waste plants after eutrophic treatments. The adsorption performances of the biochar were investigated and the results showed that the adsorption equilibrium could arrive in 30 min and the adsorption capacities for Pb²⁺, Cu²⁺, Cd²⁺ and Zn²⁺ at 30 °C were 0.57, 0.41, 0.44 and 0.48 mmol/g, respectively. The adsorption could be promoted at higher pH and temperature and the adsorption tolerance for different heavy metal ions to the existence of competing ions and organic matters was hierarchical. The adsorption was deduced to be heterozygous courses and mainly controlled by complexation of oxygen-containing groups with these heavy metal ions. It was confirmed that the biochar could be regenerated with HCl solution and the adsorption performance kept consistent in 10 adsorption–desorption cycles.

使用长根凤眼莲通过需氧/厌氧混合煅烧制备了氧化的生物炭，经过富营养化处理后可回收其废料植物。研究了生物炭的吸附性能，结果表明，30min即可达到吸附平衡，对Pb 2 ⁺，Cu 2 ⁺，Cd ²⁺和Zn ²⁺的吸附能力^较高。在30℃下分别为0.57、0.41、0.44和0.48mmol / g。在较高的pH和温度下可以促进吸附，并且不同重金属离子对竞争性离子和有机物的存在的吸附耐受性是分级的。推测吸附是杂合的，主要是通过含氧基团与这些重金属离子的络合来控制的。可以确定的是，生物炭可以用HCl溶液再生，并且在10个吸附-解吸循环中吸附性能保持一致。