Article(id=1241406718551315131, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241406711219680205, articleNumber=null, orderNo=null, doi=10.3969/j.issn.0253-6099.2024.06.018, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1716134400000, receivedDateStr=2024-05-20, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773904025924, onlineDateStr=2026-03-19, pubDate=1732982400000, pubDateStr=2024-12-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773904025924, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773904025924, creator=13701087609, updateTime=1773904025924, updator=13701087609, issue=Issue{id=1241406711219680205, tenantId=1146029695717560320, journalId=1235980550691926019, year='2024', volume='44', issue='6', pageStart='1', pageEnd='174', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773904024176, creator=13701087609, updateTime=1773911273793, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241437118384362345, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241406711219680205, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241437118388556650, tenantId=1146029695717560320, journalId=1235980550691926019, issueId=1241406711219680205, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=83, endPage=89, ext={EN=ArticleExt(id=1241406718895248068, articleId=1241406718551315131, tenantId=1146029695717560320, journalId=1235980550691926019, language=EN, title=Investigation on Adsorption Behavior of Yttrium Ions by Illite, columnId=1236276106727321817, journalTitle=Mining and Metallurgical Engineering, columnName=METALLURGY, runingTitle=null, highlight=null, articleAbstract=

Illite, a kind of clay mineral, was taken as an adsorbent in an experiment for low-concentration rare earth ions in rare earth leaching solution to explore effects of initial concentration of Y3+, adsorption temperature, pH value of solution, ion concentration, and adsorption time on the adsorption behavior of illite. Then, based on the constructed isotherm model for adsorption of yttrium ions by illite and its reaction kinetic model, the mechanism for the adsorption of yttrium ion by illite was analyzed. Results show that illite has an excellent adsorption performance for Y3+. With an increased initial concentration, higher temperature, prolonged time, and higher pH value of solution, the adsorption capacity of Y3+ for illite increases. It is found that the existence of Na+, Mg2+ and Al3+ can inhibit the adsorption of Y3+ by illite in the following descending order of importance: Al3+>Mg2+>Na+. The adsorption reaction follows Langnuir isotherm model and pseudo-second-order reaction kinetic model. Ion exchange reaction takes place during the adsorption process, thus this adsorption process belongs to chemical adsorption, with adsorption rate controlled by chemical reaction.

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以黏土矿物伊利石为吸附剂,研究了伊利石吸附稀土浸出液中低浓度稀土离子过程中Y3+初始浓度、吸附温度、溶液pH值、离子强度和反应时间对吸附的影响,构建了伊利石对钇元素吸附的等温模型和反应动力学模型,并分析了伊利石吸附钇元素的机理。结果表明:伊利石对Y3+具有优良的吸附性能,Y3+初始浓度增大、吸附温度升高、反应时间延长、溶液pH值升高,伊利石对Y3+的吸附量均增大;Na+、Mg2+、Al3+的存在会抑制伊利石对Y3+的吸附,其影响程度从大到小依次为:Al3+>Mg2+>Na+;反应模型符合Langmuir吸附等温模型和准二级反应动力学模型;吸附过程中发生离子交换,属于化学吸附,吸附反应速率由化学反应控制。

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陈卓(1993—),男,湖北武汉人,讲师,主要研究方向为矿物加工。E-mail:
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吴呈皓(1999—),男,浙江宁波人,硕士研究生,主要研究方向为稀土绿色提取。E-mail:

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吴呈皓(1999—),男,浙江宁波人,硕士研究生,主要研究方向为稀土绿色提取。E-mail:

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吴呈皓(1999—),男,浙江宁波人,硕士研究生,主要研究方向为稀土绿色提取。E-mail:

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(a)Langmuir等温吸附模型;(b)Freundlich等温吸附模型

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(a)准一级动力学模型;(b)准二级动力学模型;(c)颗粒内扩散模型;(d)Elovich模型

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(a)吸附前;(b)吸附后

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比表面积/(m2·g-1孔容积/(cm3·g-1平均孔径/nm
6.540.037 323.16
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伊利石比表面积、孔容积和平均孔径

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比表面积/(m2·g-1孔容积/(cm3·g-1平均孔径/nm
6.540.037 323.16
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T/℃Langmuir模型Freundlich模型
Qm/(μmol·g-1KL/(L·μmol-1R21/nKF/(L·μmol-1R2
1562.266 50.019 70.998 80.070 935.347 20.914 9
2570.871 70.035 50.999 80.074 939.988 80.912 0
3583.125 50.040 70.999 80.101 439.199 30.858 1
4596.899 20.059 80.999 80.101 446.379 10.790 2
55109.289 60.046 50.998 70.099 253.137 30.871 9
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伊利石吸附Y3+的Langmuir和Freundlich等温吸附模型拟合参数

, figureFileSmall=null, figureFileBig=null, tableContent=
T/℃Langmuir模型Freundlich模型
Qm/(μmol·g-1KL/(L·μmol-1R21/nKF/(L·μmol-1R2
1562.266 50.019 70.998 80.070 935.347 20.914 9
2570.871 70.035 50.999 80.074 939.988 80.912 0
3583.125 50.040 70.999 80.101 439.199 30.858 1
4596.899 20.059 80.999 80.101 446.379 10.790 2
55109.289 60.046 50.998 70.099 253.137 30.871 9
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准一级动力学模型拟合参数准二级动力学模型拟合参数
Qe/(μmol·g-1k1(10-3R2Qe/(μmol·g-1k2(10-3R2
25.7941.1700.58251.9213.6630.999
颗粒内扩散模型拟合参数Elovich模型拟合参数
kidR2αβ(103R2
0.7420.7510.27921.7680.965
), ArticleFig(id=1241406737970942514, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406718551315131, language=CN, label=表3, caption=

伊利石吸附Y3+的各动力学模型拟合参数

, figureFileSmall=null, figureFileBig=null, tableContent=
准一级动力学模型拟合参数准二级动力学模型拟合参数
Qe/(μmol·g-1k1(10-3R2Qe/(μmol·g-1k2(10-3R2
25.7941.1700.58251.9213.6630.999
颗粒内扩散模型拟合参数Elovich模型拟合参数
kidR2αβ(103R2
0.7420.7510.27921.7680.965
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伊利石对钇离子的吸附行为研究
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吴呈皓 1 , 张臻悦 1, 2 , 池汝安 1, 2 , 陈文斗 1 , 陈卓 1, 2
矿冶工程杂志 | 冶金 2024,44(6): 83-89
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矿冶工程杂志 | 冶金 2024, 44(6): 83-89
伊利石对钇离子的吸附行为研究
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吴呈皓1 , 张臻悦1, 2, 池汝安1, 2, 陈文斗1, 陈卓1, 2
作者信息
  • 1.武汉工程大学 资源与安全工程学院,湖北 武汉 430073
  • 2.绿色化工过程教育部重点实验室,湖北 武汉 430073
  • 吴呈皓(1999—),男,浙江宁波人,硕士研究生,主要研究方向为稀土绿色提取。E-mail:

通讯作者:

陈卓(1993—),男,湖北武汉人,讲师,主要研究方向为矿物加工。E-mail:
Investigation on Adsorption Behavior of Yttrium Ions by Illite
Chenghao WU1 , Zhenyue ZHANG1, 2, Ru'an CHI1, 2, Wendou CHEN1, Zhuo CHEN1, 2
Affiliations
  • 1.School of Resources and Safety Engineering, Wuhan Institute of Technology, Wuhan 430073, Hubei, China
  • 2.Key Laboratory of Green Chemical Process of Ministry of Education, Wuhan 430073, Hubei, China
出版时间: 2024-12-01 doi: 10.3969/j.issn.0253-6099.2024.06.018
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以黏土矿物伊利石为吸附剂,研究了伊利石吸附稀土浸出液中低浓度稀土离子过程中Y3+初始浓度、吸附温度、溶液pH值、离子强度和反应时间对吸附的影响,构建了伊利石对钇元素吸附的等温模型和反应动力学模型,并分析了伊利石吸附钇元素的机理。结果表明:伊利石对Y3+具有优良的吸附性能,Y3+初始浓度增大、吸附温度升高、反应时间延长、溶液pH值升高,伊利石对Y3+的吸附量均增大;Na+、Mg2+、Al3+的存在会抑制伊利石对Y3+的吸附,其影响程度从大到小依次为:Al3+>Mg2+>Na+;反应模型符合Langmuir吸附等温模型和准二级反应动力学模型;吸附过程中发生离子交换,属于化学吸附,吸附反应速率由化学反应控制。

风化壳淋积型稀土矿  /  伊利石  /  黏土矿物  /  吸附  /  化学反应  /  稀土  /  钇

Illite, a kind of clay mineral, was taken as an adsorbent in an experiment for low-concentration rare earth ions in rare earth leaching solution to explore effects of initial concentration of Y3+, adsorption temperature, pH value of solution, ion concentration, and adsorption time on the adsorption behavior of illite. Then, based on the constructed isotherm model for adsorption of yttrium ions by illite and its reaction kinetic model, the mechanism for the adsorption of yttrium ion by illite was analyzed. Results show that illite has an excellent adsorption performance for Y3+. With an increased initial concentration, higher temperature, prolonged time, and higher pH value of solution, the adsorption capacity of Y3+ for illite increases. It is found that the existence of Na+, Mg2+ and Al3+ can inhibit the adsorption of Y3+ by illite in the following descending order of importance: Al3+>Mg2+>Na+. The adsorption reaction follows Langnuir isotherm model and pseudo-second-order reaction kinetic model. Ion exchange reaction takes place during the adsorption process, thus this adsorption process belongs to chemical adsorption, with adsorption rate controlled by chemical reaction.

weathered crust elution-deposited rare earth ore  /  illite  /  clay mineral  /  adsorption  /  chemical reaction  /  rare earth  /  yttrium
吴呈皓, 张臻悦, 池汝安, 陈文斗, 陈卓. 伊利石对钇离子的吸附行为研究. 矿冶工程杂志, 2024 , 44 (6) : 83 -89 . DOI: 10.3969/j.issn.0253-6099.2024.06.018
Chenghao WU, Zhenyue ZHANG, Ru'an CHI, Wendou CHEN, Zhuo CHEN. Investigation on Adsorption Behavior of Yttrium Ions by Illite[J]. Mining and Metallurgical Engineering, 2024 , 44 (6) : 83 -89 . DOI: 10.3969/j.issn.0253-6099.2024.06.018
稀土是我国重要的金属矿产资源,被广泛应用于核工业、电子机械、石油化工、航空航天、超导材料等领域[1]。风化壳淋积型稀土矿作为全球重稀土的主要来源,是全球重要的稀土资源类型之一[2-3]。在稀土分离提取过程中会产生大量稀土废水,这些低浓度(以REO计,质量浓度2~100 mg/L)稀土废水水量大,不易进行有效处理。对风化壳淋积型稀土矿山的低浓度稀土废水进行富集提取,不仅能回收尾矿中的稀土资源、提高稀土尾矿利用率、实现不可再生资源的回收,还可以减少废水带来的环境破坏和对矿区动、植物及人类的健康影响。目前,从风化壳淋积型稀土矿低浓度稀土废水中回收稀土元素的方法[4]主要包括反渗透法、萃取法、离子交换法和吸附法。吸附法具有吸附材料价格低廉、操作简便、能耗低等优点,常用的吸附剂[5-6]有生物质、复合多孔材料和黏土矿物等,其中黏土矿物是一种经济、环保、储量大的天然吸附材料,被广泛研究和使用[7-9]。但黏土矿物作为吸附剂用于稀土矿山中低浓度稀土废水吸附回收的相关研究鲜见报道。
风化壳淋积型稀土矿主要集中在江西省龙南(高钇型)、信丰(中钇富铕型)、寻乌(富镧少钇型)等地[10],且前两种矿型中都存在较高浓度的Y元素。本文以Y3+为研究对象,对黏土矿物伊利石吸附低浓度稀土溶液进行研究,通过单因素实验,并对吸附等温曲线进行拟合分析,建立吸附过程反应动力学模型,采用多种表征手段探究伊利石对Y3+的吸附行为特征,揭示其吸附机理。
实验所用伊利石为河北承德某-0.074 mm粒级伊利石粉,其X射线衍射图谱如图1所示。由图1可以看出:伊利石纯度较高,晶体结构为2M1型;原料中含有少量石英和钠长石杂质。
吸附剂的吸附能力受溶液pH值的影响,溶液pH值的变化会影响官能团的质子化作用和去质子化作用,还会改变吸附剂表面电荷结构[11]。因此可以使用Zeta电位和零电点(PZC)来评估吸附剂的吸附能力。采用Zetasizer Nano-ZEN3600(Malvern,UK)测定分析伊利石Zeta电位,结果如图2所示。随着伊利石分散溶液pH值升高,Zeta电位先快速下降、再缓慢下降、然后再次快速下降。伊利石PZC在pH=1.8附近,pH>1.8时,伊利石表面带负电荷,这为带正电的阳离子如Y3+等与伊利石结合提供了驱动力[4],更利于Y3+吸附在带负电荷的伊利石表面。同时也说明伊利石吸附Y3+过程中静电力会产生关键作用。
采用ASAP-2460(Micromertics,Atlanta,USA)系统测定伊利石比表面积和孔径。液氮温度为-195.8 ℃,故在-197 ℃下测定氮气吸附脱附等温线,并采用Brunauer-Emmett-Teller方法计算伊利石比表面积,测试结果如图3所示,伊利石比表面积、孔容积和平均孔径数据详见表1。由图3可以看出:脱附等温线在吸附等温线上方,表现为IV型吸附等温线;脱附有滞后现象,出现明显的回滞环,是伊利石作为介孔材料的显著特征之一[12],这与伊利石中的介孔发生了毛细冷凝[8]有关。由图3表1可知,孔径介于2~50 nm之间,表明伊利石内部为介孔结构,具有较大的比表面积,孔容积和平均孔径相对较小。
静态吸附实验中,依次改变Y3+初始浓度、吸附温度、pH值及离子强度,探究单因素对伊利石吸附Y3+的影响。实验步骤为:取Y3+溶液25 mL于50 mL离心管中,加入预处理后的伊利石0.25 g,密封放置在恒温振荡仪中振荡12 h,转速180 r/min;振荡完成后取出,通过高速离心机对离心管进行固相和液相分离,转速8 000 r/min,离心15 min;取出上清液,使用PinAAcle 900T(PerkinElmer,USA)原子吸收光谱仪测定Y3+浓度,计算吸附量和吸附效率:
式中:Qe为伊利石对Y3+的平衡吸附量,μmol/g;C0为Y3+初始浓度,μmol/L;Ce为达到吸附平衡时溶液中Y3+浓度,μmol/L;M为伊利石质量,g;V为溶液体积,L;E为吸附效率,%。
配制浓度2 000 μmol/L的Y3+溶液250 mL,倒入500 mL锥形瓶中,加入伊利石0.25 g;将锥形瓶置于25 ℃恒温振荡仪中,在设定间隔时间后取5 mL上清液,通过高速离心机进行离心处理,转速8 000 r/min,离心时间5 min,使固、液两相分离。取分离后上清液测定Y3+浓度。
25 ℃、固液比10 g/L、Y3+初始浓度2 000 μmol/L条件下振荡吸附12 h,转速为180 r/min,完成振荡后抽滤、烘干,得到吸附后伊利石样品。使用GeminiSEM 300(ZEISS,Germany)场发射扫描电镜及能谱(FESEM/EDS)和Nicolet 6700(Thermo,USA)红外光谱(FTIR)对吸附前、后伊利石样品进行表征分析。
25 ℃、固液比10 g/L时,Y3+初始浓度对伊利石吸附Y3+的影响如图4所示。由图4可以看出,Y3+初始浓度不断增大的过程中,伊利石对Y3+的平衡吸附量先逐渐上升。此时,伊利石表面存在大量空余吸附位点,并且浓度梯度作为传质驱动力能克服固液相间的传质阻力[7],吸附量逐渐增大。随后伊利石对Y3+的平衡吸附量上升趋势变缓,在Y3+初始浓度2 000 μmol/L时,平衡吸附量趋于稳定,为68.9 μmol/g,此时伊利石表面的空余吸附位点被完全占据。固液比10 g/L时,伊利石表面的吸附位点是有限的,伊利石对Y3+的吸附效率随着初始浓度升高而下降。初始浓度500 μmol/L时吸附效率为96.2%。
吸附温度是影响伊利石对Y3+平衡吸附量和吸附效率的重要因素,也是判定吸附过程吸热或放热的显著标志。固液比10 g/L时,不同Y3+初始浓度下吸附温度对伊利石吸附Y3+的影响如图5所示。伊利石对Y3+的平衡吸附量随着吸附温度升高而增大,吸附温度从15 ℃升高至55 ℃,初始浓度500 μmol/L和5 000 μmol/L时的平衡吸附量分别从44.9 μmol/g和49.5 μmol/g增加至64.7 μmol/g和113.7 μmol/g,说明Y3+在伊利石上的吸附过程是吸热反应,升高温度有利于吸附过程的进行。升高温度有助于增加Y3+的活化数,Y3+更容易克服吸附活化势垒,更多的Y3+可以占据伊利石表面吸附空位,低初始浓度溶液能更早到达吸附平衡点。
研究溶液离子强度与pH值对吸附过程的影响有助于进一步探明Y3+在伊利石上的吸附机理及伊利石在不同离子种类和不同离子强度影响下的吸附性能。以离子强度分别为0.01 mol/L和0.1 mol/L的Na+、Mg2+、Al3+为背景溶液,在Y3+初始浓度2 000 μmol/L、固液比10 g/L、室温25 ℃条件下进行吸附实验,同时进行空白对照组试验,结果如图6所示。在吸附过程中,不同价态离子及不同离子强度会使伊利石对Y3+的吸附量产生不同程度的降低[13]。Na、Mg离子的存在对伊利石吸附Y3+的影响较小,其中在离子强度0.01 mol/L时伊利石对Y3+吸附量相比空白组分别下降1.9%和9.5%,离子强度0.1 mol/L时吸附量相比空白组分别下降13.4%和47.9%。而Al3+的存在使得Y3+在伊利石上完全不被吸附。可以看出,不同离子对伊利石吸附Y3+的影响程度从大到小为:Al3+>Mg2+>Na+,原因是背景溶液中的Na+、Mg2+、Al3+与Y3+发生竞争吸附,抢占伊利石表面的吸附活性位点,导致Y3+不能完全或无法与伊利石表面吸附位点结合。Na、Mg、Al的电负性依次增强,Al3+吸引电子能力更强,更易于与伊利石表面羟基络合。因此在实际处理稀土废水中Mg2+、Al3+杂质对伊利石吸附Y3+有较大影响。
研究了Na+和Mg2+在不同离子强度和溶液pH值条件下对伊利石吸附Y3+的影响,结果如图7所示。由图7可知,pH=3~7范围内,离子强度从0.01 mol/L增大到0.1 mol/L,伊利石对Y3+的吸附量减小。低离子强度下,Y3+能占据更多的吸附位点。同时,pH=3~7时,伊利石对Y3+的吸附量会随着pH值增大而增大,这是因为在低pH值条件下,溶液中含有大量H+,游离在溶液中的H+会竞争伊利石上的吸附位点,导致Y3+在伊利石上的吸附量降低。
Langmuir等温吸附模型常用来描述有均匀分布吸附位点的吸附质在被吸附分子间没有相互作用力的条件下单分子层均匀吸附的过程,其表达式为:
式中:Qe为平衡吸附量,μmol/g;Ce为平衡时的溶液浓度,μmol/L;Qm为吸附剂对吸附质的饱和吸附量,μmol/g;KL为Langmuir等温吸附模型常数,L/μmol。
Freundlich等温吸附模型经实验规律与经验得出,常用来描述非均质表面且表面吸附位点具有不同吸附能的吸附行为规律,其表达式为:
式中:KF为Freundlich等温吸附模型常数,L/μmol;n为非均质性因数。
将伊利石吸附Y3+的实验数据对这两种等温吸附模型进行拟合,结果见图8,并根据实验数据计算Langmuir等温吸附模型和Freundlich等温吸附模型的相关系数,结果见表2
通过图8表2可知,各温度条件下,伊利石吸附Y3+的Langmuir等温吸附模型相关系数R2均达到0.998以上,高于Freundlich等温吸附模型的拟合相关系数,伊利石对Y3+的吸附过程更符合Langmuir等温吸附模型,说明Y3+在伊利石上的吸附是单分子层吸附[14],吸附质间没有相互作用,吸附能力由伊利石表面的吸附位点、数量和结合方式决定。由表2可以看到,25 ℃时,伊利石对Y3+的最大吸附量为70.871 7 μmol/g,表明伊利石是一种吸附回收稀土废水中稀土元素的优良吸附剂。
反应时间对伊利石吸附Y3+的影响如图9所示。吸附过程中,伊利石对Y3+的吸附量先经历快速上升阶段,此时在伊利石上存在大量空余吸附位点,表面带正电荷的Y3+快速与伊利石表面带负电荷的离子结合,占据表面吸附空位;随后吸附量上升速度逐渐减慢,直至达到吸附平衡。
吸附反应动力学不仅能描述吸附剂吸附溶质的速率,也是定量研究吸附机理、分析吸附速率控制的重要手段。常见的吸附反应动力学模型主要有以下4种:
准一级动力学模型:
式中:Qtt时刻伊利石对Y3+的吸附量,μmol/g;k1为准一级反应动力学速率常数,min-1
准二级动力学模型:
式中k2为准二级反应动力学速率常数,g/(μmol·min)。
颗粒内扩散模型:
式中:kid为内扩散速率常数,μmol/(g·min1/2);C为扩散速率常数。
Elovich模型:
式中:α为初始吸附效率常数;β为化学吸附活化能相关参数。
为进一步探究Y3+在伊利石表面的吸附特性,采用以上4种反应动力学模型讨论Y3+在伊利石表面的吸附控制机理,并对吸附反应过程中得到的实验数据进行拟合,拟合结果如图10所示,反应动力学模型相关参数如表3所示。由图10可以看出,Y3+在伊利石上的吸附过程与准二级反应动力学模型较为吻合。由表3可以看到:准二级反应动力学模型的拟合相关系数R2=0.999,比其他3种反应动力学模型更高;准二级反应动力学模型拟合所得平衡吸附量Qe与实验所得数据一致性更好。表明Y3+在伊利石上的吸附反应为化学吸附,Y3+在伊利石表面发生了离子交换,吸附速率受化学吸附机理控制。
对伊利石吸附前后分别进行了FE-SEM表征,结果见图11。可以看出,伊利石表面呈鳞片状堆叠式排布形貌,这大大增加了伊利石的表面积,为Y3+与之接触并在其表面吸附提供了有利条件。此外,伊利石层与层之间紧密堆叠在一起,层间仅存在少量缝隙和较小的孔径和孔容积,这与图3表1结果一致。通过对比伊利石吸附Y3+前后的形貌发现,伊利石吸附Y3+后表面变得较为光滑,说明伊利石表面已经吸附了Y3+
图12为伊利石吸附Y3+后的能谱面分布扫描(EDS-Mapping)结果。Y3+在伊利石表面的分布可以通过图中亮度显示,亮度越高,说明Y3+吸附量越多。从图12可以看出,Y3+已被吸附在伊利石表面。
伊利石吸附Y3+前后的红外光谱图如图13所示。由图13可知,伊利石吸附Y3+后红外光谱图的谱峰发生明显变化和位移。伊利石中的—OH波数[15]由吸附Y3+前的3 446.55 cm-1移至吸附后的3 429.20 cm-1,波数3 618.31 cm-1处的谱峰消失。—OH峰发生红移,说明吸附过程中伊利石中部分—OH中的H+被Y3+取代[15-16],吸附反应中发生离子交换,并有新的化学键生成,再次印证了该吸附反应属于化学吸附。
通过静态动态吸附实验、拟合吸附等温模型、反应动力学模型和相应的表征分析对Y3+在伊利石上的吸附行为进行研究,得到以下结论。
1)Zeta电位和BET实验结果表明,伊利石表面具有大量负电位,为Y3+与伊利石结合提供驱动力,且吸附能力随着pH值升高而增强;伊利石属于典型的介孔材料,孔比表面积为6.54 m2/g,孔容积和孔径分别为0.037 3 cm3/g、23.16 nm。
2)伊利石对Y3+的吸附量受Y3+初始浓度、吸附温度、离子强度和反应时间影响。随着Y3+初始浓度和吸附温度升高,伊利石对Y3+的吸附能力增强,该吸附反应为吸热反应。Al3+的存在会导致Y3+在伊利石表面不吸附,而Na+和Mg2+对吸附量的影响较小。吸附反应符合Langmuir等温吸附模型和准二级反应动力学模型,是单层均匀化学吸附,吸附速率由化学反应机理控制。
3)结合FESEM、EDS和FTIR分析结果可知,伊利石的鳞片式形貌使得其有较大的表面积,为Y3+在伊利石表面吸附提供位点,使Y3+均匀吸附在伊利石表面。Y3+与—OH中的H+发生离子交换,络合生成新化学键是主要的吸附反应。
  • 国家自然科学基金(92162109; 52222405; 52304293)
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2024年第44卷第6期
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doi: 10.3969/j.issn.0253-6099.2024.06.018
  • 接收时间:2024-05-20
  • 首发时间:2026-03-19
  • 出版时间:2024-12-01
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  • 收稿日期:2024-05-20
基金
国家自然科学基金(92162109; 52222405; 52304293)
作者信息
    1.武汉工程大学 资源与安全工程学院,湖北 武汉 430073
    2.绿色化工过程教育部重点实验室,湖北 武汉 430073

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陈卓(1993—),男,湖北武汉人,讲师,主要研究方向为矿物加工。E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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