本文主要研究内容
作者徐建（2019）在《铁基花生壳生物炭复合功能材料吸附/降解水中新兴污染物PPCPs研究》一文中研究指出：药品及个人护理用品(Pharmaceuticals and Personal Care Products,PPCPs)是一种难处理的新兴环境污染物,其种类繁多,广泛存在于水环境中,对水资源保护和循环利用造成了严重的安全隐患。基于铁基生物炭的吸附法和铁基生物炭活化过硫酸盐(Persulfate,PS)技术对去除水体中难降解的有机污染物具有良好的处理效果。针对生物炭难以回收重复利用,本研究利用微波辅助沉淀法制备了纳米三氧化二铁负载花生壳磁性生物炭(MMBC),研究复合材料的均匀分散性和回收性及对典型抗生素环丙沙星(Ciprofloxacin,CIP)的吸附性能与机理;针对生物炭对PS活化效率不高,本研究制备了纳米零价铁负载花生壳生物炭(nZVI/BC)和亚纳米铜掺杂羟基氧化铁负载花生壳生物炭(Cu-FeOOH/BC),探讨nZVI/BC对PS活化降解泛影酸(Diatrizoate,DTZ)效能及影响因素,分析了 nZVI/BC对PS的活化机理;鉴定了 Cu-FeOOH/BC活化PS自由基,讨论四环素(Tetracycline,TC)降解的中间产物,阐明了Cu-FeOOH/BC活化PS降解TC的反应机理。具体的研究内容如下:(1)以农业废弃物花生壳为生物质来源,采用微波辅助传统化学沉淀法制成高性能、低成本的磁性生物炭复合材料—纳米三氧化二铁负载花生壳生物炭(MMBC)。微波辐照增大了原生生物炭的比表面积和孔隙体积,提高了铁氧化物在生物炭表面的分散程度。此外,微波效应使三氧化二铁颗粒与生物炭表面结合牢固,增强了吸附剂的磁性,有利于吸附剂的反复多次使用。在最佳pH6.0条件下,微波辅助合成的磁性生物炭对CIP的吸附量为8.30 mg/g,高于传统化学共沉淀法制备的吸附剂(4.50mg/g)。溶液离子S042-和PO43-分别促进和抑制了吸附剂对CIP的吸附性能。5次循环实验表明,微波辅助合成的磁性生物炭性质更稳定,对水体中CIP的吸附量更高、可重复利用性更强。(2)利用花生壳生物炭负载纳米零价铁,成功制备nZVI/BC复合材料,解决了nZVI颗粒团聚的问题,提高了PS活化效率,促进了水体中DTZ的降解。实验表明复合材料中nZVI与BC配比为1:2时(nZVI/2BC),nZVI的分散性最好且比表面积最大,对PS的活化效率最高。在pH 3.0和25℃条件下,0.45 g/L nZVI/2BC与25 mM PS组合对DTZ的去除率为100%。DTZ的去除在酸性pH为3.0～7.0时表现良好。pH 3.0～pH 11.0的自由基淬灭实验表明酸性条件下溶液中硫酸根自由基占主导优势,而在碱性条件下硫酸根自由基则转化成大量羟基自由基。通过考察Fe0、Fe2+和Fe3+之间的转运,探讨了nZVI/2BC活化PS的机理。(3)采用一种简便易行的方法成功合成了铜掺杂羟基氧化铁—花生壳生物炭复合材料(Cu-FeOOH/BC),双金属间的电子转移能够进一步提高PS活化效率。通过活化PS降解TC比较不同铜/铁摩尔比复合材料的活化性能,确定0.5Cu-1FeOOH/BC(Cu/Fe摩尔比为0.5:1)为最佳活化材料,在pH7.0和25℃条件下,0.2 g/L 0.5Cu-1FeOOH/BC与20 mM PS反应120 min后对TC去除率达到98.0%。实验中分别考察了活化剂和PS用量、无机阴离子、pH等影响因素对0.5Cu-lFeOOH/BC-PS降解体系的影响。适当增加活化剂浓度和PS剂量可以提高TC的降解,但过量添加将抑制TC的去除。无机阴离子对TC去除的抑制强度为HCO3->Cl->HPO42->SO42->NO3-。活化剂具有良好的可回收性和稳定性,连续5次使用后TC的去除率仍保持在90%以上。TC分子在氧化性自由基SO4·-和HO·的轰击后,通过开环或中心碳开裂等方式裂解成小分子物质并最终矿化成二氧化碳和水等无机物。铁基生物炭具有良好的吸附能力和重复回收利用性,可用于抗生素等药物的吸附去除;铁基生物炭与PS耦合形成硫酸根自由基高级氧化技术(SO4·--AOP),可作为一种稳定有效的抗生素和碘代造影剂等药物废水治理技术。
Abstract
yao pin ji ge ren hu li yong pin (Pharmaceuticals and Personal Care Products,PPCPs)shi yi chong nan chu li de xin xing huan jing wu ran wu ,ji chong lei fan duo ,an fan cun zai yu shui huan jing zhong ,dui shui zi yuan bao hu he xun huan li yong zao cheng le yan chong de an quan yin huan 。ji yu tie ji sheng wu tan de xi fu fa he tie ji sheng wu tan huo hua guo liu suan yan (Persulfate,PS)ji shu dui qu chu shui ti zhong nan jiang jie de you ji wu ran wu ju you liang hao de chu li xiao guo 。zhen dui sheng wu tan nan yi hui shou chong fu li yong ,ben yan jiu li yong wei bo fu zhu chen dian fa zhi bei le na mi san yang hua er tie fu zai hua sheng ke ci xing sheng wu tan (MMBC),yan jiu fu ge cai liao de jun yun fen san xing he hui shou xing ji dui dian xing kang sheng su huan bing sha xing (Ciprofloxacin,CIP)de xi fu xing neng yu ji li ;zhen dui sheng wu tan dui PShuo hua xiao lv bu gao ,ben yan jiu zhi bei le na mi ling jia tie fu zai hua sheng ke sheng wu tan (nZVI/BC)he ya na mi tong can za qiang ji yang hua tie fu zai hua sheng ke sheng wu tan (Cu-FeOOH/BC),tan tao nZVI/BCdui PShuo hua jiang jie fan ying suan (Diatrizoate,DTZ)xiao neng ji ying xiang yin su ,fen xi le nZVI/BCdui PSde huo hua ji li ;jian ding le Cu-FeOOH/BChuo hua PSzi you ji ,tao lun si huan su (Tetracycline,TC)jiang jie de zhong jian chan wu ,chan ming le Cu-FeOOH/BChuo hua PSjiang jie TCde fan ying ji li 。ju ti de yan jiu nei rong ru xia :(1)yi nong ye fei qi wu hua sheng ke wei sheng wu zhi lai yuan ,cai yong wei bo fu zhu chuan tong hua xue chen dian fa zhi cheng gao xing neng 、di cheng ben de ci xing sheng wu tan fu ge cai liao —na mi san yang hua er tie fu zai hua sheng ke sheng wu tan (MMBC)。wei bo fu zhao zeng da le yuan sheng sheng wu tan de bi biao mian ji he kong xi ti ji ,di gao le tie yang hua wu zai sheng wu tan biao mian de fen san cheng du 。ci wai ,wei bo xiao ying shi san yang hua er tie ke li yu sheng wu tan biao mian jie ge lao gu ,zeng jiang le xi fu ji de ci xing ,you li yu xi fu ji de fan fu duo ci shi yong 。zai zui jia pH6.0tiao jian xia ,wei bo fu zhu ge cheng de ci xing sheng wu tan dui CIPde xi fu liang wei 8.30 mg/g,gao yu chuan tong hua xue gong chen dian fa zhi bei de xi fu ji (4.50mg/g)。rong ye li zi S042-he PO43-fen bie cu jin he yi zhi le xi fu ji dui CIPde xi fu xing neng 。5ci xun huan shi yan biao ming ,wei bo fu zhu ge cheng de ci xing sheng wu tan xing zhi geng wen ding ,dui shui ti zhong CIPde xi fu liang geng gao 、ke chong fu li yong xing geng jiang 。(2)li yong hua sheng ke sheng wu tan fu zai na mi ling jia tie ,cheng gong zhi bei nZVI/BCfu ge cai liao ,jie jue le nZVIke li tuan ju de wen ti ,di gao le PShuo hua xiao lv ,cu jin le shui ti zhong DTZde jiang jie 。shi yan biao ming fu ge cai liao zhong nZVIyu BCpei bi wei 1:2shi (nZVI/2BC),nZVIde fen san xing zui hao ju bi biao mian ji zui da ,dui PSde huo hua xiao lv zui gao 。zai pH 3.0he 25℃tiao jian xia ,0.45 g/L nZVI/2BCyu 25 mM PSzu ge dui DTZde qu chu lv wei 100%。DTZde qu chu zai suan xing pHwei 3.0～7.0shi biao xian liang hao 。pH 3.0～pH 11.0de zi you ji cui mie shi yan biao ming suan xing tiao jian xia rong ye zhong liu suan gen zi you ji zhan zhu dao you shi ,er zai jian xing tiao jian xia liu suan gen zi you ji ze zhuai hua cheng da liang qiang ji zi you ji 。tong guo kao cha Fe0、Fe2+he Fe3+zhi jian de zhuai yun ,tan tao le nZVI/2BChuo hua PSde ji li 。(3)cai yong yi chong jian bian yi hang de fang fa cheng gong ge cheng le tong can za qiang ji yang hua tie —hua sheng ke sheng wu tan fu ge cai liao (Cu-FeOOH/BC),shuang jin shu jian de dian zi zhuai yi neng gou jin yi bu di gao PShuo hua xiao lv 。tong guo huo hua PSjiang jie TCbi jiao bu tong tong /tie ma er bi fu ge cai liao de huo hua xing neng ,que ding 0.5Cu-1FeOOH/BC(Cu/Fema er bi wei 0.5:1)wei zui jia huo hua cai liao ,zai pH7.0he 25℃tiao jian xia ,0.2 g/L 0.5Cu-1FeOOH/BCyu 20 mM PSfan ying 120 minhou dui TCqu chu lv da dao 98.0%。shi yan zhong fen bie kao cha le huo hua ji he PSyong liang 、mo ji yin li zi 、pHdeng ying xiang yin su dui 0.5Cu-lFeOOH/BC-PSjiang jie ti ji de ying xiang 。kuo dang zeng jia huo hua ji nong du he PSji liang ke yi di gao TCde jiang jie ,dan guo liang tian jia jiang yi zhi TCde qu chu 。mo ji yin li zi dui TCqu chu de yi zhi jiang du wei HCO3->Cl->HPO42->SO42->NO3-。huo hua ji ju you liang hao de ke hui shou xing he wen ding xing ,lian xu 5ci shi yong hou TCde qu chu lv reng bao chi zai 90%yi shang 。TCfen zi zai yang hua xing zi you ji SO4·-he HO·de hong ji hou ,tong guo kai huan huo zhong xin tan kai lie deng fang shi lie jie cheng xiao fen zi wu zhi bing zui zhong kuang hua cheng er yang hua tan he shui deng mo ji wu 。tie ji sheng wu tan ju you liang hao de xi fu neng li he chong fu hui shou li yong xing ,ke yong yu kang sheng su deng yao wu de xi fu qu chu ;tie ji sheng wu tan yu PSou ge xing cheng liu suan gen zi you ji gao ji yang hua ji shu (SO4·--AOP),ke zuo wei yi chong wen ding you xiao de kang sheng su he dian dai zao ying ji deng yao wu fei shui zhi li ji shu 。
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论文作者分别是来自南京大学的徐建，发表于刊物南京大学2019-10-28论文，是一篇关于吸附论文,降解论文,生物炭论文,过硫酸盐论文,活化论文,新兴污染物论文,南京大学2019-10-28论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自南京大学2019-10-28论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：吸附论文; 降解论文; 生物炭论文; 过硫酸盐论文; 活化论文; 新兴污染物论文; 南京大学2019-10-28论文;