煅烧水滑石同时去除废水中Sb(Ⅴ)和刚果红的性能及机制  

Properties and mechanism of simultaneous removal of Sb(Ⅴ)and Congo red from wastewater by calcined hydrotalc

作　　者：鲜雯 黄阳[1,2,3] 罗立涛 李椹 XIAN Wen;HUANG Yang;LUO Litao;LI Shen(School of Environment and Resources,Southwest University of Science and Technology,Mianyang Sichuan 621010,China;Key Laboratory of Solid Waste Treatment and Recycling,Ministry of Education,Mianyang Sichuan 621010,China;Non-metallic Mineral Powder Modification and High Quality Utilization Engineering Laboratory,Mianyang Sichuan 621010,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]固体废物处理与资源化教育部重点实验室,四川绵阳6210103 [3]非金属矿粉体改性与高质化利用工程实验室,四川绵阳621010

出　　处：《化工矿物与加工》2024年第10期31-38,共8页Industrial Minerals & Processing

基　　金：四川省高等学校重点实验室科研项目(SCFQWLY-2021-Z-07)。

摘　　要：研发能够同时有效去除重金属和有机污染物的环境材料对于工业废水绿色高效处理具有重要意义。本文采用水热法合成了镁铝水滑石(MgAl-LDH),结合高温处理的方法制备了煅烧水滑石(LDO)。在分析煅烧产物的结构和性质的基础上,运用静态批量法研究了在煅烧温度、初始质量浓度、接触时间和共存体系等条件下LDO去除Sb(Ⅴ)和刚果红(CR)的性能。结果表明,煅烧温度对于LDO去除Sb(Ⅴ)和CR的效果具有显著影响,在煅烧温度为500℃时,去除容量分别可达426.4 mg/g和1516.2 mg/g,这是因为高温煅烧后LDO的比表面积和孔隙体积增大,LDO与水溶液接触重建层状结构后具有较强的捕获Sb(Ⅴ)和CR阴离子污染物插入层间的能力;LDO对Sb(Ⅴ)和CR的去除容量在前3 h内增加迅速,之后缓慢增加,在6 h左右时达到吸附平衡,这是因为开始时LDO具有大量活性位点,随着接触时间的延长,Sb(Ⅴ)和CR被积累吸附在其表面并占据了部分活性位点,吸附质需要克服更大的空间位阻才能与吸附剂反应,因此吸附速度变慢,直至LDO表面的吸附位点被完全占据,吸附达到平衡;去除容量随着初始质量浓度的升高逐渐增加,这是因为较高的浓度使吸附质更容易突破液相与固体吸附剂表面间的传质阻力;在共存体系下LDO对Sb(Ⅴ)和CR的去除容量略低于单一体系,这可能与Sb(Ⅴ)和CR竞争LDO浸出的液相Mg^(2+)以及LDO表面吸附位点有关。LDO主要依靠静电引力、络合作用、结晶沉淀以及MgAl-LDH的记忆效应实现对Sb(Ⅴ)和CR的同时高效去除。The development of environmental materials that can effectively remove heavy metals and organic pollutants simultaneously is of great significance for the green and efficient treatment of industrial wastewater.In this paper,magnesium aluminum hydrotalcite(MgAl-LDH)was synthesized by hydrothermal method,and calcined hydrotalcite(LDO)was prepared by high-temperature treatment.Based on the analysis of the structure and properties of the calcined product,the performance of LDO in removing Sb(Ⅴ)and Congo red(CR)under calcination temperature,initial mass concentration,contact time,and coexisting system conditions was studied using static batch method.The results indicate that calcination temperature has a significant effect on the removal of Sb(Ⅴ)and CR by LDO.At a calcination temperature of 500℃,the removal capacity can reach 426.4 mg/g and 1516.2 mg/g,respectively.This is because the specific surface area and pore volume of LDO increase after high-temperature calcination,and LDO has a strong ability to capture Sb(Ⅴ)and CR anion pollution after reconstructing the layered structure in contact with aqueous solution;The removal capacity of Sb(Ⅴ)and CR by LDO increases rapidly in the first 3 h,and then increases slowly,reaching adsorption equilibrium at about 6 h.This is because at the beginning,LDO has a large number of active sites,and with the increase of contact time,Sb(Ⅴ)and CR are accumulated and adsorbed on its surface and occupy part of the active sites.The adsorbent needs to overcome a larger steric hindrance to react with the adsorbent,so the adsorption rate slows down until the adsorption site on the LDO surface is completely occupied and the adsorption equilibrium is reached.The removal capacity increases gradually with the increase of the initial mass concentration,because the higher concentration makes the adsorbent more easily break through the mass transfer resistance between the liquid phase and the solid adsorbent surface.The removal capacity of Sb(Ⅴ)and CR by LDO in the co-existing system

关 键 词：镁铝水滑石 煅烧温度 Sb(Ⅴ) 刚果红 共存体系 接触时间 吸附位点 

分 类 号：X703[环境科学与工程—环境工程]