3种方法制备NiCoCr-LDHs对MO的吸附性能研究

Study on the Adsorption Performance of NiCoCr-LDHs Prepared by Three Methods for MO

使用尿素水解法(Urea)、恒定pH共沉淀法(CC-H)、超声共沉淀法(U-H)制备了新型NiCoCr-LDHs吸附剂,研究其在各种因素条件下对甲基橙染料废水的吸附性能的影响,并对3种NiCoCr-LDHs吸附实验的结果进行分析与评价。结果表明:不同方法制备3种NiCoCr-LDHs吸附行为均符合Langmuir等温吸附和准二级动力学模型,表明3种材料是以单层吸附和层间离子交换为主。Urea、CC-H、U-H制备材料的最大吸附容量分别为355、390和278 mg/g,不同制备技术使3种吸附剂在表面结构、比表面积等方面有较大区别,最终导致在吸附过程中最大吸附量有显著差别,并简要分析了其吸附机理。

In this paper,a new type of NiCoCr-LDHs adsorbent was prepared by urea hydrolysis method(Urea),constant pH coprecipitation method(CC-H)and ultrasonic coprecipitation method(U-H).The adsorption performance of NiCoCr-LDHs on methyl orange dye wastewater under different factors was investigated,and its adsorption behavior was evaluated.The research results indicate that:The adsorption behavior of three NiCoCr-LDHs preparation using different methods conforms to Langmuir adsorption isotherm model and quasi second-order kinetic model,which indicated that the three materials are mainly monolayer adsorption and interlayer ion exchange.The maximum adsorption capacities of Urea,CC-H,and U-H prepared materials are 355,390,and 278 mg/g,respectively.The surface structure,specific surface area,and other aspects of the three adsorbents vary greatly due to different preparation techniques,which also leads to different adsorption capacities of the materials.This article also briefly analyzes the adsorption mechanism of NiCoCr-LDHs on MO.