本文主要研究内容
作者邵太康(2019)在《可漂浮吸附剂DTCS/ALG/HGMs对水溶液及稻田土壤中重金属的去除》一文中研究指出:近年来水体及土壤中重金属污染问题愈加严重,重金属不但严重危害生态环境,还可通过食物链进入人体,从而危害人体健康。目前,吸附法被广泛用于处理重金属污染废水,但由于普通的吸附剂一般难于与土壤分离,因此,应用吸附法去除土壤中重金属的工作很少见到文献报道。针对以上问题,本文研究出了一种新型可漂浮生物吸附剂用于水溶液中的重金属的去除。同时,为了去除土壤中重金属,本文通过将吸附剂与土壤及水的混合溶液充分接触,通过吸附剂吸附从土壤颗粒上转移到溶液中的重金属,从而间接的达到将土壤颗粒上的重金属去除的目的,且吸附剂吸附重金属后可很好的与土壤溶液进行分离。利用海藻酸钠(ALG)的包裹性能将DTPA修饰后的壳聚糖(DTCS)与空心玻璃微珠(HGMs)包封在海藻酸钙凝胶珠中,并在酸性溶液中用戊二醛进行交联,制得新型可漂浮吸附剂DTCS/ALG/HGMs,并进一步研究了该吸附剂对重金属污染水溶液和重金属污染水稻田土壤中Cu和Cd的吸附性能及吸附机理。具体研究结果如下:(1)合成并制备新型可漂浮吸附剂DTCS/ALG/HGMs,并用扫描电子显微镜(SEM)、热重分析仪(TGA)、傅里叶红外光谱仪(FTIR)对材料的组成及结构进行了表征。SEM结果表明空心玻璃微珠表面包裹了一层DTCS和ALG的复合聚合物膜,TGA结果表明吸附剂中有机聚合物的含量为35.2%,FTIR中多种特征峰证明了吸附剂中HGMs和DTCS的存在。(2)研究了DTCS/ALG/HGMs对水溶液中Cu2+和Cd2+离子的吸附性能。在水溶液中,吸附剂对Cu2+和Cd2+的最大吸附容量分别为33.5mg·g-1和48.0 mg·g-1,溶液中Na+和Ca2+的存在对吸附剂吸附Cu2+和Cd2+影响不显著,动力学研究表明吸附剂对水中Cu2+和Cd2+的吸附均复合伪二级动力学模型,并伴有一定程度的粒子内扩散。吸附等温曲线表明吸附剂对水中Cu2+的吸附符合Sips模型,证明吸附剂对水中Cu2+的吸附是发生在介于均相和非均相之间的混合吸附;吸附剂对水中Cd2+的吸附符合Freundlich等温吸附模型,说明水中Cd2+的吸附是发生在非均相表面的吸附。(3)探究了DTCS/ALG/HGMs对Cd污染水稻田土、高浓度Cu污染水稻田土、低浓度Cu污染水稻田土壤中重金属的去除性能,结果表明:5%剂量的吸附剂对Cd污染水稻田土、高浓度和低浓度Cu污染水稻田土壤最大去除率分别可达34.9%,92.0%和77.3%。根据动力学数据分析,吸附剂对高浓度和低浓度Cu污染土壤的吸附分别复合Elovich模型和伪二级动力学模型,证明吸附剂对Cu污染土壤中的Cu的吸附是一个复杂、非均相的化学过程。形态分析结果表明吸附剂可以高效去除土壤中可交换态及碳酸盐结合态和铁/锰氧化物结合态(可还原态)的Cu。
Abstract
jin nian lai shui ti ji tu rang zhong chong jin shu wu ran wen ti yu jia yan chong ,chong jin shu bu dan yan chong wei hai sheng tai huan jing ,hai ke tong guo shi wu lian jin ru ren ti ,cong er wei hai ren ti jian kang 。mu qian ,xi fu fa bei an fan yong yu chu li chong jin shu wu ran fei shui ,dan you yu pu tong de xi fu ji yi ban nan yu yu tu rang fen li ,yin ci ,ying yong xi fu fa qu chu tu rang zhong chong jin shu de gong zuo hen shao jian dao wen suo bao dao 。zhen dui yi shang wen ti ,ben wen yan jiu chu le yi chong xin xing ke piao fu sheng wu xi fu ji yong yu shui rong ye zhong de chong jin shu de qu chu 。tong shi ,wei le qu chu tu rang zhong chong jin shu ,ben wen tong guo jiang xi fu ji yu tu rang ji shui de hun ge rong ye chong fen jie chu ,tong guo xi fu ji xi fu cong tu rang ke li shang zhuai yi dao rong ye zhong de chong jin shu ,cong er jian jie de da dao jiang tu rang ke li shang de chong jin shu qu chu de mu de ,ju xi fu ji xi fu chong jin shu hou ke hen hao de yu tu rang rong ye jin hang fen li 。li yong hai zao suan na (ALG)de bao guo xing neng jiang DTPAxiu shi hou de ke ju tang (DTCS)yu kong xin bo li wei zhu (HGMs)bao feng zai hai zao suan gai ning jiao zhu zhong ,bing zai suan xing rong ye zhong yong wu er quan jin hang jiao lian ,zhi de xin xing ke piao fu xi fu ji DTCS/ALG/HGMs,bing jin yi bu yan jiu le gai xi fu ji dui chong jin shu wu ran shui rong ye he chong jin shu wu ran shui dao tian tu rang zhong Cuhe Cdde xi fu xing neng ji xi fu ji li 。ju ti yan jiu jie guo ru xia :(1)ge cheng bing zhi bei xin xing ke piao fu xi fu ji DTCS/ALG/HGMs,bing yong sao miao dian zi xian wei jing (SEM)、re chong fen xi yi (TGA)、fu li xie gong wai guang pu yi (FTIR)dui cai liao de zu cheng ji jie gou jin hang le biao zheng 。SEMjie guo biao ming kong xin bo li wei zhu biao mian bao guo le yi ceng DTCShe ALGde fu ge ju ge wu mo ,TGAjie guo biao ming xi fu ji zhong you ji ju ge wu de han liang wei 35.2%,FTIRzhong duo chong te zheng feng zheng ming le xi fu ji zhong HGMshe DTCSde cun zai 。(2)yan jiu le DTCS/ALG/HGMsdui shui rong ye zhong Cu2+he Cd2+li zi de xi fu xing neng 。zai shui rong ye zhong ,xi fu ji dui Cu2+he Cd2+de zui da xi fu rong liang fen bie wei 33.5mg·g-1he 48.0 mg·g-1,rong ye zhong Na+he Ca2+de cun zai dui xi fu ji xi fu Cu2+he Cd2+ying xiang bu xian zhe ,dong li xue yan jiu biao ming xi fu ji dui shui zhong Cu2+he Cd2+de xi fu jun fu ge wei er ji dong li xue mo xing ,bing ban you yi ding cheng du de li zi nei kuo san 。xi fu deng wen qu xian biao ming xi fu ji dui shui zhong Cu2+de xi fu fu ge Sipsmo xing ,zheng ming xi fu ji dui shui zhong Cu2+de xi fu shi fa sheng zai jie yu jun xiang he fei jun xiang zhi jian de hun ge xi fu ;xi fu ji dui shui zhong Cd2+de xi fu fu ge Freundlichdeng wen xi fu mo xing ,shui ming shui zhong Cd2+de xi fu shi fa sheng zai fei jun xiang biao mian de xi fu 。(3)tan jiu le DTCS/ALG/HGMsdui Cdwu ran shui dao tian tu 、gao nong du Cuwu ran shui dao tian tu 、di nong du Cuwu ran shui dao tian tu rang zhong chong jin shu de qu chu xing neng ,jie guo biao ming :5%ji liang de xi fu ji dui Cdwu ran shui dao tian tu 、gao nong du he di nong du Cuwu ran shui dao tian tu rang zui da qu chu lv fen bie ke da 34.9%,92.0%he 77.3%。gen ju dong li xue shu ju fen xi ,xi fu ji dui gao nong du he di nong du Cuwu ran tu rang de xi fu fen bie fu ge Elovichmo xing he wei er ji dong li xue mo xing ,zheng ming xi fu ji dui Cuwu ran tu rang zhong de Cude xi fu shi yi ge fu za 、fei jun xiang de hua xue guo cheng 。xing tai fen xi jie guo biao ming xi fu ji ke yi gao xiao qu chu tu rang zhong ke jiao huan tai ji tan suan yan jie ge tai he tie /meng yang hua wu jie ge tai (ke hai yuan tai )de Cu。
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论文作者分别是来自华中科技大学的邵太康,发表于刊物华中科技大学2019-10-11论文,是一篇关于可漂浮吸附剂论文,壳聚糖论文,二乙基三胺五乙酸论文,海藻酸钠论文,华中科技大学2019-10-11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,资料来自华中科技大学2019-10-11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。
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