奶酪棒状氧化镁吸附水中重金属锰的效能与机理  

Adsorption Performance and Mechanism of Manganese From Wastewater by Cheese-Like MgO

作　　者：王炳旭 董亚鹏 王淑欣 梁海 王婉婷 张欢 王瑜晨 杨云洪 WANG Bingxu;DONG Yapeng;WANG Shuxin;LIANG Hai;WANG Wanting;ZHANG Huan;WANG Yuchen;YANG Yunhong(Liaoning Provincial Engineering Research Center for High-Value Utilization of Magnesite,Yingkou Institute of Technology,Yingkou 115014,China;Liaoning Institute of Energy Research Co.,Ltd.,Yingkou 115003,China;Yingkou Magnesite Chemical Ind Group Co.,Ltd.,Yingkou 115100,China)

机构地区：[1]辽宁省菱镁矿高值利用工程研究中心,营口理工学院,辽宁营口115014 [2]辽宁省能源研究所有限公司,辽宁营口115003 [3]营口菱镁化工集团有限公司,辽宁营口115100

出　　处：《有色金属工程》2024年第4期166-174,共9页Nonferrous Metals Engineering

基　　金：辽宁省“兴辽英才计划”(XLYC2207058,XLYC2007185);辽宁省科技计划联合计划(2023-MSLH-313);辽宁省菱镁矿高值利用工程研究中心基金项目(LMNKZ202301)。

摘　　要：以硫酸镁、碳酸氢铵为原料,在无表面活性剂条件下合成了棒状结构碱式碳酸镁前驱体,经高温热解得到多孔奶酪棒状氧化镁(C-MgO)。基于SEM、XRD、FT-IR、TG表征技术分析了其表面形貌、物相组成、官能团组成等物化性能。并探究了C-MgO吸附废水中重金属锰的效能与机理。结果表明,C-MgO展示出5793 mg/g超高的锰吸附能力,优于目前报道吸附材料。此外,动力学研究表明该材料能够在加入量仅为0.08 g/L的条件下实现废水中锰的快速去除。C-MgO对锰的吸附过程主要吸附机理为MgO质子化、锰氢氧根配位、镁锰络合等,使活性MgO通过化学吸附转变为MgMn2O4。固定床动态吸附实验证明了C-MgO具有较好的应用前景。研究提供了一种便捷的前驱体法合成的奶酪棒状MgO合成策略,吸附材料能够实现锰废水的高效去除。The cheese rod-like magnesium oxide(C-MgO)was obtained via pyrolyzing basic magnesium carbonate precursor with rod shape synthesized from magnesium sulfate and ammonium bicarbonate in solution in the absence of surfactants.The surface morphology,phase composition,functional groups and other physical and chemical properties were analyzed using SEM,XRD,FT-IR,TG characterizations.The adsorption efficiency and mechanism of manganese by C-MgO were investigated.The results show that the C-MgO exhibits a supremely high adsorption capacity of 5793 mg/g of manganese,which is higher than the reported adsorbents.In addition,kinetic results show that the C-MgO can achieve rapid removal of manganese from wastewater with low dosage of 0.08 g/L.The results of adsorption mechanism study showed that the main adsorption mechanism of C-MgO for manganese is MgO protonation,manganese hydroxide coordination,magnesium manganese complexation,during which the MgO transformed into MgMn 2 O 4 by chemisorption.The fixed bed adsorption experiment proves that C-MgO has a good potential application prospect.Therefore,this investigation provides a facile strategy for preparing high-performance cheese-like MgO,which can achieve efficient removal of manganese from wastewater.

关 键 词：MGO 锰 吸附 废水 机理 动力学 

分 类 号：X52[环境科学与工程—环境工程]