广西科学
廣西科學
엄서과학
GUANGXI SCIENCES
2014年
4期
370-375
,共6页
王一兵%柯珂%雷富%许铭本
王一兵%柯珂%雷富%許銘本
왕일병%가가%뢰부%허명본
马尾藻%重金属%生物吸附%条件优化%吸附动力学
馬尾藻%重金屬%生物吸附%條件優化%吸附動力學
마미조%중금속%생물흡부%조건우화%흡부동역학
Sargassum sp.%heavy metal%biosorption%optimization%adsorption kinetics
【目的】以马尾藻粉为生物吸附剂，研究其在静态实验中对Cd2＋和 Ni2＋的吸附及脱附能力，并对吸附速度、动力学、重金属选择性和吸附剂再生等问题进行探讨。【方法】采用单因素法分析 pH 值、初始浓度、平衡离子类型等条件因素对重金属吸附容量的影响，采用准一级和准二级动力学模型对 Cd2＋、Ni2＋的吸附数据进行拟合。【结果】Cd2＋的最佳吸附条件为pH值4．5、初始浓度500mg/L、平衡离子为NO3-，Ni2＋的最佳吸附条件为pH值3.0、初始浓度900mg/L、平衡离子为Cl-；Cd2＋、Ni2＋的吸附平衡到达时间分别为50min和25min；准二级动力学模型对吸附数据的拟合效果更好，相关系数（R2）均大于0．99；对混合溶液中不同重金属的选择性吸附顺序为Pb2＋＞Ni2＋＞Cd2＋＞Mn2＋；1．0mol/L HCl 对 Cd2＋、Ni2＋的理论洗脱率均可达到99％。【结论】马尾藻粉对Cd2＋和 Ni2＋的吸附容量大，吸附条件温和，重金属脱附率高，是一种性能良好的生物吸附剂。
【目的】以馬尾藻粉為生物吸附劑，研究其在靜態實驗中對Cd2＋和 Ni2＋的吸附及脫附能力，併對吸附速度、動力學、重金屬選擇性和吸附劑再生等問題進行探討。【方法】採用單因素法分析 pH 值、初始濃度、平衡離子類型等條件因素對重金屬吸附容量的影響，採用準一級和準二級動力學模型對 Cd2＋、Ni2＋的吸附數據進行擬閤。【結果】Cd2＋的最佳吸附條件為pH值4．5、初始濃度500mg/L、平衡離子為NO3-，Ni2＋的最佳吸附條件為pH值3.0、初始濃度900mg/L、平衡離子為Cl-；Cd2＋、Ni2＋的吸附平衡到達時間分彆為50min和25min；準二級動力學模型對吸附數據的擬閤效果更好，相關繫數（R2）均大于0．99；對混閤溶液中不同重金屬的選擇性吸附順序為Pb2＋＞Ni2＋＞Cd2＋＞Mn2＋；1．0mol/L HCl 對 Cd2＋、Ni2＋的理論洗脫率均可達到99％。【結論】馬尾藻粉對Cd2＋和 Ni2＋的吸附容量大，吸附條件溫和，重金屬脫附率高，是一種性能良好的生物吸附劑。
【목적】이마미조분위생물흡부제，연구기재정태실험중대Cd2＋화 Ni2＋적흡부급탈부능력，병대흡부속도、동역학、중금속선택성화흡부제재생등문제진행탐토。【방법】채용단인소법분석 pH 치、초시농도、평형리자류형등조건인소대중금속흡부용량적영향，채용준일급화준이급동역학모형대 Cd2＋、Ni2＋적흡부수거진행의합。【결과】Cd2＋적최가흡부조건위pH치4．5、초시농도500mg/L、평형리자위NO3-，Ni2＋적최가흡부조건위pH치3.0、초시농도900mg/L、평형리자위Cl-；Cd2＋、Ni2＋적흡부평형도체시간분별위50min화25min；준이급동역학모형대흡부수거적의합효과경호，상관계수（R2）균대우0．99；대혼합용액중불동중금속적선택성흡부순서위Pb2＋＞Ni2＋＞Cd2＋＞Mn2＋；1．0mol/L HCl 대 Cd2＋、Ni2＋적이론세탈솔균가체도99％。【결론】마미조분대Cd2＋화 Ni2＋적흡부용량대，흡부조건온화，중금속탈부솔고，시일충성능량호적생물흡부제。
[Objective]The abilities of dead Sargassum sp.biomass as a biosorbent for removing and recovering Cd2+ and Ni2+ ions from aqueous solutions were studied in batch experiments. Adsorption velocity,kinetics,metal selection and absorbent regeneration were also investigated in this work.[Methods]On the basis of single factor analysis,the effects of adsorption parame-ters,such as pH,initial concentration and counter ions,on uptake capacities of Cd2+ and Ni2+were evaluated.The adsorption data were fitted by the pseudo-first and pseudo-second order ki-netics.[Results]The optimal adsorption factors for Cd2+ were pH of 4.5,initial concentration of 500mg/L,counter ions of NO-3 ,and the optimal adsorption factors for Ni2+ were pH of 3.0,in-itial concentration of 900mg/L,counter ion of Cl-.The equilibrium time for Cd2+ and Ni2+ was 50min and 25min,respectively.Both adsorptions of Cd2+ and Ni2+ onto Sargassum sp.were in good agreement with the pseudo-second order kinetic model,and the correlation coefficients (R2)were above 0.99.The order of selectivityfor different heavy metal ions in a mixed solutionwas Pb2+>Ni2+>Cd2+>Mn2+.The desorptionrates of Cd2+ and Ni2+ reached 99% in theory byusing 1.0mol/L HCl as a desorption reagent.[Conclusion]These results illuminated that deadSargassum sp.is an excellent biosorbent for re-moving and recovery heavy metals from aqueous solution,and it has a broad perspectives in industrial application in the future.
