High effective adsorption of Pb(II) from solution by biochar derived from torrefaction of ammonium persulphate pretreated bamboo

Biochar was prepared by torrefaction of ammonium persulphate pretreated bamboo (labeled as APBC) and applied into elimination of Pb(II) from water solutions. APBC was characterized by N-2 adsorption-desorption isotherms, elemental and Zeta potential analyses, SEM-EDS, XPS, and FTIR. Abundant Nand O-containing groups appeared atop APBC. Batch sorption assays revealed that APBC had high affinity and strong sorption ability towards Pb(II). The high Pb(II) adsorbing ability was attributed to the high contents of Nand O-containing functional groups of APBC. The adsorption mechanism mainly occurred by inner-sphere surface complexation. Hence, torrefaction of ammonium persulphate pretreated bamboo is a promising strategy for producing efficient biochar that is applicable for industrial wastewater treatment.

生物炭通过过硫酸铵预处理的竹子（标记为APBC）的烘焙制备而成，并应用于去除水溶液中的铅（II）。通过N - 2吸附 - 脱附等温线、元素分析和Zeta电位分析、扫描电子显微镜 - 能谱仪（SEM - EDS）、X射线光电子能谱（XPS）以及傅里叶变换红外光谱（FTIR）对APBC进行了表征。APBC表面出现了大量含氮和含氧基团。批量吸附实验表明，APBC对铅（II）具有高亲和力和强吸附能力。APBC对铅（II）的高吸附能力归因于其含氮和含氧官能团的高含量。吸附机制主要是通过内球表面络合发生的。因此，过硫酸铵预处理竹子的烘焙是一种很有前景的策略，可用于生产适用于工业废水处理的高效生物炭。