羟基磷灰石/甘蔗渣生物质炭对水中Cd2+的动态吸附研究

Dynamic Adsorption Characteristics of Cadmium from Water by Hydroxyapatite/Bagasse Biomass Adsorbent

以羟基磷灰石/甘蔗渣生物质炭为吸附剂,对水中重金属镉进行了吸附实验。研究了pH值、Cd2+质量浓度、吸附剂质量、动态流速等对穿透曲线的影响。结果表明,穿透时间随着pH值、吸附剂量的增加而增大,随着Cd2+质量浓度、动态流速的增加而缩短。Thomas模型常数(KTH)随着pH值、吸附剂量的增加而增大,随着初始Cd2+质量浓度、动态流速的增加而减小,由Thomas模型拟合计算获得其对Cd2+的饱和吸附量为43.15 mg/g。Adams-Bohart模型常数(KAB)随着初始Cd2+质量浓度、动态流速增加而减小,随着pH值、吸附剂量增加而增大。

Cadmium in water was adsorbed by hydroxyapatite/bagasse biochar(HAP-BC) as adsorbent. The effects of pH value, Cd 2+ mass concentration, adsorbent mass and dynamic flow rate on the penetration curve were studied. The results show that the variation trend of penetration time increases with the increase of pH value and adsorption dose, the penetration time decreases with the increase of Cd 2+ mass concentration and dynamie flow rate. The Thomas model constant ( K TH ) increases with the increase of pH value and adsorption dose, and decreases with the increase of initial Cd 2+ mass concentration and dynamic flow rate. The saturated adsorption capacity of Cd 2+ is 43.15 mg/g obtained by fitting the Thomas Model. The adams-bohart model constant ( K AB ) decreases with the increase of initial Cd 2+ mass concentration and dynamic flow rate, and increases with the increase of pH value, adsorption dose.