原位还原精制凹凸棒石高级氧化降解磺胺嘧啶  

In situ reduction of refined attapulgite for advanced oxidative degradation of sulfadiazine

作　　者：王兴鹏 姜超[1] 李慧玉 陈馨 冯拥军 WANG Xingpeng;JIANG Chao;LI Huiyu;CHEN Xin;FENG Yongjun(State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical and Technology,Beijing 100029,China;Key Laboratory of Corridor Resources and Utilization of Gansu,Hexi University,Zhangye 734000,Gansu,China;Gansu Western Attapulgite Research and Application Institute,Baiyin 730900,Gansu,China)

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029 [2]河西学院甘肃省河西走廊特色资源利用省级重点实验室,甘肃张掖734000 [3]甘肃西部凹凸棒石应用研究院,甘肃白银730900

出　　处：《精细化工》2024年第12期2717-2726,共10页Fine Chemicals

基　　金：国家重点研发计划项目(2022YFA1503400);中央高校业务经费项目(JD2325)。

摘　　要：基于干湿集成解离技术处理甘肃白银低品位含铁凹凸棒石(APT),得到了改性精制凹凸棒石(SAPT),采用高温原位还原法经氢气还原制备了原位还原凹凸棒石(HAPT)。采用XRF、XRD、FTIR、SEM和TEM对HAPT进行了表征,探究了HAPT在过硫酸钾(PDS)存在下对抗生素磺胺嘧啶(SDZ)的降解性能,考察了HAPT投加量、PDS浓度、SDZ初始质量浓度、初始pH和反应温度对SDZ降解率的影响。结果表明,在HAPT投加量为2.0 g/L(以SDZ初始溶液的体积计,下同)、PDS浓度为3.6 mmol/L、初始pH为3、反应温度30℃的条件下,HAPT/PDS体系在240 min内对初始质量浓度为10 mg/L的SDZ的降解率达到96.8%。电子顺磁共振和活性物种捕获实验结果表明,HAPT/PDS体系中主要的活性物种为硫酸根自由基和羟基自由基,其中硫酸根自由基起主导作用。Low-grade iron-containing attpulgite(APT) from Baiyin,Gansu was treated by dry and wet integrated dissociation technique to produce modified and refined attapulgite(SAPT),which was further reduced by hydrogen through a high-temperature in-situ reduction method to synthesize in-situ reduced attapulgite(HAPT).HAPT was characterized by XRF,XRD,FTIR,SEM and TEM,and analyzed for its degradation performance on sulfadiazine(SDZ),one kind of antibiotics,in the presence of potassium persulfate(PDS).The effects of HAPT dosage,PDS concentration,SDZ initial mass concentration,initial pH and reaction temperature on the degradation rate of SDZ were further investigated.The results demonstrated that under the conditions of HAPT dosage 2.0 g/L(based on the volume of the initial solution of SDZ,the same below),PDS concentration 3.6 mmol/L,initial pH 3,and reaction temperature 30 ℃,the degradation rate of SDZ with an initial mass concentration of 10 mg/L by HAPT/PDS system reached 96.8% within 240 min.Electron paramagnetic resonance and active species capture experiments showed that the main active species in the HAPT/PDS system were sulfate radicals and hydroxyl radicals,with sulfate radicals playing a dominant role.

关 键 词：凹凸棒石 原位还原 过硫酸盐 磺胺嘧啶 羟胺 高级氧化技术 水处理技术 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]