改性生物炭去除水体中N,P营养物的研究

Removal of N,P Nutrientsfrom Water by Modified Biochar

为了从水体中去除N,P营养物质,文中采用废弃的针叶树树枝制备生物炭,并采用药剂镧,锆,铈,及镧-锆,镧-铈,镧-锆-铈相结合的药剂对原始生物炭进行改性。研究结果表明:改性后的生物炭对水中N,P营养物质的吸附效果,磷酸盐>硝酸盐>氨氮;在pH为7时,镧炭具有优秀的同时吸附去除磷酸盐和硝酸盐的性能,对磷酸盐和硝酸盐的去除率分别为100%和6.57%,吸附量分别为43.00mg·g^(-1)和2.99mg·g^(-1);动力学分析显示对磷酸盐的吸附是发生在非均质表面的化学吸附。

In order to remove N and P nutrients from water bodies,waste coniferous tree branches were used to prepare biochar,and the original biochar was modified with lanthanum,zirconium,cerium,and lanthanum-zirconium,lanthanum-cerium,lanthanum-zirconium-cerium combination agents.The results show that the modified biochar absorbs phosphate best,followed by nitrate and then ammonium.At pH 7,lanthanum carbon has excellent absorption performance-it can absorb and remove phosphate and nitrate simultaneously;the removal rates are 100%and 6.57%,and the absorption capacities 44.13mg·g^(-1) and 2.99mg·g^(-1),respectively.The kinetic analysis shows that the absorption of phosphate is a chemical adsorption that occurs on the heterogeneous surfaces.