风化煤提取的胡敏酸对镉的吸附性能及其应用潜力
文献类型：期刊论文
| 作者 | 孟凡德; 袁国栋 ; 韦婧; 毕冬雪; 王海龙; 刘兴元
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| 刊名 | 浙江大学学报(农业与生命科学版)
 |
| 出版日期 | 2016-07-18 |
| 卷号 | 42期号:4页码:460-468 |
| 关键词 | 镉 胡敏酸 吸附 风化煤 污染土壤 |
| ISSN号 | 1008-9209 |
| 其他题名 | Humic acid from leonardite for cadmium adsorption and potential applications |
| 产权排序 | 中国科学院烟台海岸带研究所/中国科学院海岸带环境过程与生态修复重点实验室/山东省海岸带环境过程重点实验室;中国科学院大学;浙江农林大学环境与资源学院;广东大众农业科技股份有限公司; |
| 通讯作者 | 袁国栋,中国科学院烟台海岸带研究所，E-mail：gdyuan@yic.ac.cn |
| 中文摘要 | 以碱溶酸析"法从新疆风化煤中提取的胡敏酸为研究对象,对其理化性质和表面形态进行表征,并通过吸附试验探究反应时间、溶液pH、镉离子(Cd~(2+))质量浓度对胡敏酸吸附Cd~(2+)的影响.结果表明:风化煤提取的胡敏酸碳元素质量分数高达58.68%,羧基的质量摩尔浓度为5.81mol/kg,等电点为2.7;该胡敏酸含Cd量为0.15mg/kg,符合国家土壤环境质量标准.胡敏酸对Cd~(2+)的吸附在8h内达到平衡,吸附量随Cd~(2+)质量浓度(0~100mg/L)和溶液pH升高而增加,到pH=6.0时最大,之后胡敏酸开始溶解导致吸附量降低.Langmuir方程比Freundlich方程能更好... |
| 英文摘要 | Cadmium (Cd)isatoxicandcarcinogeniccontaminantreleasedfromawiderangeofindustries.Its accumulationinsoiland waterisofgrowingenvironmentalandhealthconcerns.Thus,thereisanincreasing demandfor materialsthatareeffectiveforCdadsorption,economicallyfeasible,andunlikelytocreatenew environmentalproblems. Humicacid (HA)isubiquitousinsoilandsediment.Itcanalsobeextractedfromligniteandleonardite, whichcanbeviewedasancientbiocharandoxidizedancientbiochar,respectively.Beingabundantincarboxyland hydroxylgroups (—COOH ,—OH),HAhasastrongpropensityforadsorbingheavymetalcationsbyforming inner-spherecomplexes,thusreducingtheirmobilityandbioavailability.Aleonardite(Leo)fromXinjiang,China wasusedtoproduceHAbyultrasonicallydispersingLeoin0.1mol/LNaOHsolutionat40 ℃for30min,and thenflocculatingthesupernatantwith6mol/LHCl.TheobtainedHA (Leo-HA)wascharacterizedforitssurface propertiesbyscanningelectronmicroscopy(SEM)andFouriertransforminfraredspectroscopy(FTIR),andwas analyzedforelementalcompositions,carboxylgroup,andisoelectric point (pI).Further,its adsorption characteristicsweredeterminedbykineticandbatchexperiments,anditspotentialapplicationsinremovingCd2+ from waterandimmobilizingCd2+insoilswereassessedbasedonitstechnicalreliability,economicfeasibility,and environmentalimpact.Forenvironmentalrelevance,arelativelylowrangeofCd2+ concentrations(0-100mg/L) wasusedinadsorptionexperiment,duringwhichthepHofsolutionwasmaintainedconstant. ResultsshowedthatLeo-HAhadalowpIof2.7andahighCcontentof58.68%,whichisnotunusualfor coal-derived HA.FTIR confirmedtheabundanceof —COOH and —OH groups.Thecarboxylgroup was determinedat5.81mol/kg.ThelowCdconcentration(0.15mg/kg)ofLeo-HAmettheprerequisiteforsafeuse inagriculturalland,asregulatedbyFarmlandEnvironmentalQualityStandards.KineticstudiesshowedthatCd2+ adsorptionontoLeo-HAreachedequilibriumin8handtheprocesswaspH-dependent.Theadsorptionincreased withpH within2.0-6.0,andthendecreasedaspHfurtherincreasedto7.0.ThisisbecauseLeo-HAstartsto dissolveassolutionpHapproachestoneutral.AdsorptiondatawerebetterfittedintoLangmuirequation (R2 = 0.991)thanFreundlichequation (R2 =0.891),suggestingthemonolayernatureofCd2+ adsorptionontoLeo- HA.AtpH5.0,themaximumadsorptioncapacity(Qm )derivedfromtheLangmuirequationwas137.37mg/g, whichwasequivalentto71% ofthecarboxylgroupsofLeo-HA.ThisQm wasmuchhigherthanwhathadbeen reportedintheliteratureforlignite,lignite-derived HA,andsoilHA.AsimplecomparisonatpH4.3andan initialCd2+ concentrationof80 mg/LshowedthattheLeo-HA adsorbed moreCd2+ (86.97 mg/g)thanthe referenceHA1R106H (73.49mg/g)fromIHSSdid,eventhoughthelaterhadahighercarboxylcontent(6.82 mol/kg).Thisapparentdiscrepancywasduetothefactthatdissolutionof1R106H wasobservedatpH 4.3, whereastheLeo-HA wasstableatthispH. LeonarditeisabundantacrossChina.Leo-HAhastheadvantagesoflowcost,highadsorptioncapacity,and lowCdcontent,thusitisaprospectiveadsorbentforimmobilizingCd2+ incontaminatedsoilsorremovingCd2+ from water.LimehaswidelybeenusedtoimmobilizeCd2+ insoils,butittendstoreducesoilorganicmatter content,damagesoilstructure,andposeahazardtothesafetyofitsusersinthefield.Incontrast,Leo-HAis beneficialtosoilstructureandsoilquality,aswellassafetohandleinthefield.FieldtrialsofapplyingLeo-HA ontoheavymetalcontaminatedsoilswouldbealogicalsteptofollow. |
| 学科主题 | 环境科学 |
| 收录类别 | CSCD |
| 语种 | 中文 |
| CSCD记录号 | CSCD:5800799 |
| 源URL | [http://ir.yic.ac.cn/handle/133337/17111]  |
| 专题 | 烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室 烟台海岸带研究所_近岸生态与环境实验室 |
| 作者单位 | 1.中国科学院烟台海岸带研究所/中国科学院海岸带环境过程与生态修复重点实验室/山东省海岸带环境过程重点实验室 2.中国科学院大学 3.浙江农林大学环境与资源学院 4.广东大众农业科技股份有限公司 |
| 推荐引用方式 GB/T 7714 | 孟凡德,袁国栋,韦婧,等. 风化煤提取的胡敏酸对镉的吸附性能及其应用潜力[J]. 浙江大学学报(农业与生命科学版),2016,42(4):460-468. |
| APA | 孟凡德,袁国栋,韦婧,毕冬雪,王海龙,&刘兴元.(2016).风化煤提取的胡敏酸对镉的吸附性能及其应用潜力.浙江大学学报(农业与生命科学版),42(4),460-468. |
| MLA | 孟凡德,et al."风化煤提取的胡敏酸对镉的吸附性能及其应用潜力".浙江大学学报(农业与生命科学版) 42.4(2016):460-468. |
入库方式： OAI收割
来源：烟台海岸带研究所
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