摘要:
含磷废水的大量排放使水体富营养化,最终导致区域水质恶化。为有效去除水中的磷酸盐,以硝酸锌、硝酸锰为原料,三乙醇胺/水为溶剂体系,采用水热法合成ZnO和层状锌锰氢氧化物(ZnMn-LDHs)纳米吸附材料,利用SEM、XRD、Zeta电位仪、FT-IR对纳米材料进行表征,并考察了纳米吸附材料对磷酸盐的去除性能。结果表明:n Zn∶n Mn是影响ZnMn-LDHs向ZnO纳米材料转变的主要因素;ZnO和ZnMn-LDHs对磷酸根的吸附均符合Freundlich等温吸附模型及准二级动力学模型;相同条件下,ZnMn-LDHs对磷酸根的吸附性能优于ZnO;通过0.01 mol/L的NaOH脱附可实现材料的再生,6次循环利用后,ZnO和ZnMn-LDHs对磷酸根的去除率仍可达80%以上。
关键词:
ZnO,
ZnMn-LDHs,
磷酸根,
循环利用
Abstract:
The discharge of phosphorus-containing wastewater has led to eutrophication of water bodies, ultimately resulting in the deterioration of regional water quality. To effectively remove phosphates from water, ZnO and layered zinc-manganese hydroxide (ZnMn-LDHs) nano-adsorption materials were synthesized using zinc nitrate and manganese nitrate as raw materials and triethanolamine/water as the solvent system by hydrothermal method. The nano-materials were characterized by SEM, XRD, Zeta potentiometer, and FT-IR. The removal performance of nano-adsorption materials for phosphates was investigated. The results showed that the ratio of n Zn to n Mn was the main factor affecting the transformation of ZnMn-LDHs to ZnO nano-materials. The adsorption of phosphate by ZnO and ZnMn-LDHs both conformed to the Freundlich isothermal adsorption model and pseudo-second-order kinetic model. Under the same conditions, the adsorption performance of ZnMn-LDHs for phosphate was better than that of ZnO. The regeneration of the materials could be achieved through desorption with 0.01 mol/L NaOH. After six cycles of utilization, the removal rates of phosphate by ZnO and ZnMn-LDHs could still reach over 80%.
Key words:
ZnO,
ZnMn-LDHs,
phosphate radical,
recycling
中图分类号:
夏梦岩, 田慧媛, 仝蕊蕊, 李阳, 崔节虎. Mn2+调控制备ZnO、ZnMn-LDHs及其对磷酸盐的吸附研究[J]. 工业水处理, 2024, 44(7): 67-73.
Mengyan XIA, Huiyuan TIAN, Ruirui TONG, Yang LI, Jiehu CUI. Studies on preparation regulated by Mn2+ and phosphate adsorption of ZnO,ZnMn-LDHs[J]. Industrial Water Treatment, 2024, 44(7): 67-73.