生物炭负载纳米铁系金属去除硝酸盐作用研究

Study on nitrate removal by nano iron-based metals supported on biochar

以小麦秸秆为原料,制备生物炭负载纳米铁系金属Cu@(Fe/BC)复合材料,考察铜负载量、初始pH值、初始硝酸盐浓度与共存阴离子对Cu@(Fe/BC)复合材料还原硝酸盐的影响。结果表明,硝酸盐还原速率随铜负载量的增加而增加;复合材料对pH的适应范围较广;不同初始硝酸盐氮浓度(20,40,60,80 mg/L)下,硝酸盐去除率均达到90%以上;存在PO_(4)^(3-)时,硝酸盐去除率明显降低。同时,以小麦秸秆为原料,制备Pd@(Fe/BC)、(Cu-Pd)@(Fe/BC)复合材料,在反应60 min时,Pd@(Fe/BC)复合材料体系对硝酸盐的去除率为97.32%;在反应30 min时,(Cu-Pd)@(Fe/BC)对硝酸盐的去除率为99%。

The biochar-loaded iron-based metals,Cu@(Fe/BC)composites were prepared using wheat straw as raw material.The copper loading,initial pH value,initial nitrate concentration,and coexisting anions to the effect of Cu@(Fe/BC)composites on nitrate reduction were investigated.The results showed that the nitrate reduction rate increased with the increase of copper loading;Cu@(Fe/BC)composites had a wide range of pH adaptation;under the initial nitrate nitrogen concentration(20,40,60,80 mg/L),the nitrate removal rate all reached more than 90%;the nitrate removal rate decreased significantly in the presence of PO_(4)^(3-).Meanwhile,Pd@(Fe/BC)and(Cu-Pd)@(Fe/BC)composites were prepared with wheat straw as raw material,and the removal rate of nitrate by the Pd@(Fe/BC)composite system was 97.32%for 60 min;the removal rate of nitrate was 99%by(Cu-Pd)@(Fe/BC)at the reaction time of 30 min.