纳米四氧化三铁沸石微球吸附废水中铅离子研究
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摘要
采用纳米Fe_3O_4对人造沸石(NZ)进行改性,研究了吸附剂投加量、废水pH、不同交联剂、离子含量等对改性磁性沸石微球去除废水中Pb~(2+)性能的影响,分析了改性沸石的吸附动力学和吸附等温线。结果表明,在Pb~(2+)溶液pH=3,吸附剂投加量为0.6 g/L条件下,钙交联纳米Fe_3O_4改性沸石微球(Ca-MZS)对溶液中Pb~(2+)的去除率达93.4%,最大吸附量为77.1 mg/g,较NZ的最大吸附量8.02 mg/g有明显提高。Ca-MZS比铁交联纳米Fe_3O_4改性沸石微球(Fe-MZS)的最大吸附量高2.57 mg/g。Ca-MZS对Pb~(2+)的吸附过程符合准2级动力学模型和Freundlich模型。Pb~(2+)溶液分别加入Na~+、K~+时,Ca-MZS对Pb~(2+)去除率分别下降了9.3个、16.1个百分点。
Artificial zeolite was modified by Fe_3O_4 nanoparticles, the effects of the adsorbent dosage, solution pH, different cross-linking agents and ionic strength on Pb~(2+)removal were investigated, and the adsorption kinetics and isotherms were discussed. The results showed that, when Ca-MZS(Ca2+-crosslinked Fe_3O_4 nanoparticles-modified zeolite beads) dosage was adjusted to 0.6 g/L, with wastewater pH of 3, the removal efficiency of Pb~(2+)reached93.4%, the adsorption capacity was 77.1 mg/g, higher than that obtained by NZ which was 8.02 mg/g. The adsorption capacity of Pb~(2+)with Ca-MZS was2.57 mg/g higher than that of Fe-MZS(Fe2+-crosslinked Fe_3O_4 nanoparticles-modified zeolite beads). The Pb~(2+)adsorption process could be well fitted to the pseudo-second-order kinetics model and Freundlich model. There was a little bit effect of Na~+ and K~+ ions on Pb~(2+) adsorption, the removal rate reduced 9.31 and 16.1 percentage point, respectively.
Artificial zeolite was modified by Fe_3O_4 nanoparticles, the effects of the adsorbent dosage, solution pH, different cross-linking agents and ionic strength on Pb~(2+)removal were investigated, and the adsorption kinetics and isotherms were discussed. The results showed that, when Ca-MZS(Ca2+-crosslinked Fe_3O_4 nanoparticles-modified zeolite beads) dosage was adjusted to 0.6 g/L, with wastewater pH of 3, the removal efficiency of Pb~(2+)reached93.4%, the adsorption capacity was 77.1 mg/g, higher than that obtained by NZ which was 8.02 mg/g. The adsorption capacity of Pb~(2+)with Ca-MZS was2.57 mg/g higher than that of Fe-MZS(Fe2+-crosslinked Fe_3O_4 nanoparticles-modified zeolite beads). The Pb~(2+)adsorption process could be well fitted to the pseudo-second-order kinetics model and Freundlich model. There was a little bit effect of Na~+ and K~+ ions on Pb~(2+) adsorption, the removal rate reduced 9.31 and 16.1 percentage point, respectively.
引文
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[3]SHENG G,HU J,LI H,et al.Enhanced sequestration of Cr(VI)by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study[J].Chemosphere,2016,148:227-232.
[4]GE F,LI M M,YE H,et al.Effective removal of heavy metal ions Cd2+,Zn2+,Pb2+,Cu2+from aqueous solution by polymer-modified magnetic nanoparticles[J].Journal of Hazardous Materials,2012,211/212(2):366-372.
[5]马江雁.锰氧化物改性沸石(MOCZ)对罗丹明B和4-氯苯酚的吸附研究[D].郑州:郑州大学,2010.
[6]FAN L,LUO C,SUN M,et al.Highly selective adsorption of lead ions by water-dispersible magnetic chitosan/graphene oxide composites[J].Colloids Surf B Biointerfaces,2013,103(1):523-529.
[7]TANG W W,ZENG G M,GONG J L,et al.Simultaneous adsorption of atrazine and Cu(II)from wastewater by magnetic multi-walled carbon nanotube[J].Chemical Engineering Journal,2012,211/212(22):470-478.
[8]WANG F,LU X,LI X.Selective removals of heavy metals(Pb2+,Cu2+,and Cd2+)from wastewater by gelation with alginate for effective metal recovery[J].Hazard Mater,2016,308:75-83.
[9]KUANG Y,DU J,ZHOU R,et al.Calcium alginate encapsulated Ni/Fe nanoparticles beads for simultaneous removal of Cu(II)and monochlorobenzene[J].Journal of Colloid&Interface Science,2015,447:85-91.
[10]CHANG J,WOO H,KO M S,et al.Targeted removal of trichlorophenol in water by oleic acid-coated nanoscale palladium/zero-valent iron alginate beads[J].Hazard Mater,2015,293:30-36.
[11]HAMMOUDA S B,ADHOUM N,MONSER L.Chemical oxidation of a malodorous compound,indole,using iron entrapped in calcium alginate beads[J].Journal of Hazardous Materials,2016,301:350.
[12]FARBO M G,URGEGHE P P,FIORI S,et al.Adsorption of ochratoxin A from grape juice by yeast cells immobilised in calcium alginate beads[J].International Journal of Food Microbiology,2016,217:29-34.
[13]陆蓓蓓,冯杨阳,陈英文,等.淀粉-g-丙烯酸/凹凸棒土复合物制备及其吸附废水中NH4+-N性能[J].环境工程学报,2011,5(10):2173-2176.
[14]熊代余,于亚伦,汪旭光.爆炸膨化玉米芯、杨木片的比表面积和孔径分布测定[C].郑州:第8届中国工程爆破学术经验交流会,2004.
[15]VU H C,DWIVEDI A D,LE T T,et al.Magnetite graphene oxide encapsulated in alginate beads for enhanced adsorption of Cr(VI)and As(V)from aqueous solutions:role of crosslinking metal cations in pH control[J].Chemical Engineering Journal,2017,307:220-229.
[16]李倩囡,张建强,谢江,等.人工湿地基质吸附磷素性能及动力学研究[J].水处理技术,2011,37(9):64-67.
[17]黄会斐.改性沸石吸附重金属及苯酚的基础研究[D].杭州:浙江工业大学,2011.