镁铝双金属氢氧化物改性硬硅钙石对铅离子的吸附研究分析 材料学管理专业

镁铝双金属氢氧化物改性硬硅钙石对铅离子的吸附研究摘要：采用水热合成法制备硬硅钙石，再采用水热共沉淀法将 Mg(II)、Al(Ⅲ)金属盐在碱性条件下对硬硅钙石进行改性，合成镁铝双金属氢氧化物改性硬硅钙石。将镁铝双金属氢氧化物改性硬硅钙石放置在含 Pb2+的模拟废水中进行吸附研究，同时将材料用 FT-IR 和 SEM 进行结构表征。结果表明，镁铝双金属氢氧化物改性硬硅钙石对 Pb2+溶液初始浓度为 300 mg/L、吸附剂用量 0.04 g、40 min 吸附时间、pH=6.4、T=313.15 K 条件下，吸附容量 727.55 mg/g，去除率 97.01 %。镁铝双金属氢氧化物改性硬硅钙石对铅离子的吸附更符合 Freundlish 等吸附等温曲线，相关系数都在 0.97以上。动力学分析发现，镁铝双金属氢氧化物改性硬硅钙石对铅离子的吸附，既符合准一级动力学方程，又符合准二级动力学方程，相关系数均大于 0.99。关键词：镁铝双金属氢氧化物改性硬硅钙石；铅(Ⅱ)；吸附；等温吸附；动力学模型Adsorption of Pb(Ⅱ) in Wastewater by Magnesium Aluminum Double Metal Hydroxide Modified Xonotlite Abstract: Xonotlite were preparationed by hydrothermal synthesis method. Hydrothermal-coprecipitation method was used to combine different bivalent and trivalent metal compounds, such as Al(NO)3·9H2O, Mg(NO)3·6H2O, xonotlite, to form Magnesium Aluminum Double Metal Hydroxide Modified Xonotlite(Mg-Al-LDHs-CSH) in alkaline conditions.The study combined FT-IR and SEM to analysze the crystal structure and function group before and after adsorption lead ion on the Mg-Al-LDHs-CSH. This material is used to adsorb lead ions in wastewater and the adsorption mechanism of magnesium-aluminum double-metal hydroxide modified xonotlite as adsorbent for lead ions was discussed. The experiment investigated the effects of pH, adsorbent dosage, adsorption time, initial concentration of lead ions and reaction temperature on adsorption. Optimum adsorption conditions were found to be initial pH of 6.4, Mg-Al-LDHs-CSH dosage of 0.04 g, initial Pb(II) ion concent...