镍铁水滑石对水中磷酸根的去除及其解析性能研究
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摘要
高效、低成本实现污水中磷元素的去除及回收对解决磷危机具有重要的意义。采用共沉淀法结合超声处理技术制备出一系列不同镍铁比(Ni∶Fe)的超薄镍铁水滑石(NixFe-LDHs)纳米片,通过构建水滑石Zeta电位和吸附磷酸根(PO43-)的能力与镍铁比的关系曲线,发现Zeta电位和结晶性能是影响LDHs吸附性能的2个重要内在因素。当Ni∶Fe为2∶1时,其对PO43-的吸附量可达248. 00 mg/g。在此基础上,通过适当的再生工艺,经过6次循环后,Ni2Fe-LDHs的再生效率仍可达59. 2%。
The removal and recovery of phosphorus from wastewater in an efficient and cost-effective way are critical for resolving the phosphorus crisis. The ultra-thin NixFe-LDHs nanosheets with different molar ratio of Ni∶ Fe were fabricated by a co-precipitation method combined with ultrasonic treatment. The Zeta position and crystallinity played an important role in promoting the adsorption of LDH, which were observed in the relationship between the Zeta position, crystallinity and the molar ratio of Ni ∶ Fe. When the molar ratio of Ni ∶ Fe was 2 ∶ 1, the amount of phosphate adsorption could reach 248. 00 mg/g. The regenerative efficiency of Ni2 Fe-LDHs was still up to 59. 2% after adsorption and desorption for six cycles through proper regeneration technology.
The removal and recovery of phosphorus from wastewater in an efficient and cost-effective way are critical for resolving the phosphorus crisis. The ultra-thin NixFe-LDHs nanosheets with different molar ratio of Ni∶ Fe were fabricated by a co-precipitation method combined with ultrasonic treatment. The Zeta position and crystallinity played an important role in promoting the adsorption of LDH, which were observed in the relationship between the Zeta position, crystallinity and the molar ratio of Ni ∶ Fe. When the molar ratio of Ni ∶ Fe was 2 ∶ 1, the amount of phosphate adsorption could reach 248. 00 mg/g. The regenerative efficiency of Ni2 Fe-LDHs was still up to 59. 2% after adsorption and desorption for six cycles through proper regeneration technology.
引文
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[22]郭亚祺,杨洋,伍新花,等.煅烧的水滑石同时去除水体中砷和氟[J].环境工程学报,2014,8(6):2485-2491.GUO Y Q,YANG Y,WU X H,et al. Removal of arsenate and fluoride in water by calcined layered double hydroxides[J].Chinese Journal of Environmental Engineering,2014,8(6):2485-2491.
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[2] DONNERT D,SALECKER M. Elimination of phosphorus from municipal and industrial waste water[J]. Water Science&Technology,1999,40(4/5):195-202.
[3] GUPTA A D,SARKAR S,GHOSH P,et al. Phosphorous dynamics of the aquatic system constitutes an important axis for waste water purification in natural treatment pond(s)in East Kolkata Wetlands[J]. Ecological Engineering,2016,90:63-67.
[4] VERGILI I,GOLEBATMAZ U,KAYA Y,et al. Performance and microbial shift during acidification of a real pharmaceutical wastewater by using an anaerobic sequencing batch reactor(AnSBR)[J]. Journal of Environmental Management,2018,212:186-197.
[5] MIAO Z,QIANG L,RUI J,et al. Ammonium inhibition through the decoupling of acidification process and methanogenesis in anaerobic digester revealed by high throughput sequencing[J].Biotechnology Letters,2016,39(2):1-6.
[6] ALABRI M,TIZAOUI C,HILAL N. Combined macromolecular adsorption and coagulation for improvement of membrane separation in water treatment[C]//AGU Fall Meeting. AGU Fall Meeting Abstracts,2012:231-265.
[7] XU Z,WU T,SHI J,et al. Photocatalytic antifouling PVDF ultrafiltration membranes based on synergy of graphene oxide and Ti O2for water treatment[J]. Journal of Membrane Science,2016,520:281-293.
[8] WANG L K,VACCARI D A,LI Y,et al. Chemical precipitation[J]. Cheminform,2006,37(10):919-927.
[9] MOUELHI M,MARZOUK I,HAMROUNI B. Optimization studies for water defluoridation by adsorption:application of a design of experiments[J]. Desalination&Water Treatment,2016,57(21):9889-9899.
[10] GIBBONS M K,GAGNON G A. Adsorption of arsenic from a Nova Scotia groundwater onto water treatment residual solids[J].Water Research,2010,44(19):5740-5749.
[11]贾云生,王火焰,赵雪松,等. CaAl类水滑石的磷酸根吸附性能及其影响因素研究[J].化学学报,2015,73(11):1207-1213.JIA Y S,WANG H Y,ZHAO X S,et al. Exploring and evaluation of CaAl hydrotalcite-like adsorbents on phosphate recycling[J].Acta Chimica Sinica,2015,73(11):1207-1213.
[12] WU Y,YING Y,JI Z Z,et al. Effective removal of pyrophosphate by Ca-Fe-LDH and its mechanism[J]. Chemical Engineering Journal,2012,179(1):72-79.
[13]王镜渊,汪国庆,叶春,等. ZnxCa(2-x)-Fe吸附剂的制备及其除磷机制[J].环境科学研究,2015,28(7):1145-1151.WANG J Y,WANG G Q,YE C,et al. Preparation of ZnxCa(2-x)-Fe adsorbent and its mechanism of phosphorus removal[J].Environmental Science Research,2015,28(7):1145-1151.
[14] ZHANG X L,GUO L,HUANG H L,et al. Removal of phosphorus by the core-shell bio-ceramic/Zn-layered double hydroxides(LDHs)composites for municipal wastewater treatment in constructed rapid infiltration system[J]. Water Research,2016,96:280-291.
[15]钟琼,李欢. Mg/Al水滑石微波共沉淀法合成及其对BrO-3吸附性能的研究[J].环境科学,2014,35(4):1566-1575.ZHONG Q,LI H. Mg/Al layered double hydroxides prepared by microwave-assisted co-precipitation method for the removal of bromate[J]. Environmental Science,2014,35(4):1566-1575.
[16] LI Y J,GAO B Y,WU T,et al. Hexavalent chromium removal from aqueous solution by adsorption on aluminum magnesium mixed hydroxide[J]. Water Research,2009,43(12):3067-3075.
[17] LIU R,FROST R L,MARTENS W N. Absorption of the selenite anion from aqueous solutions by thermally activated layered double hydroxide[J]. Water Research,2009,43(5):1323-1329.
[18] LL,HE J,WEI M,et al. Uptake of chloride ion from aqueous solution by calcined layered double hydroxides:equilibrium and kinetic studies[J]. Water Research,2006,40(4):735-743.
[19] MOHAPATRA M,ANAND S,MISHRA B K,et al. Review of fluoride removal from drinking water[J]. Journal of Environmental Management,2010,91(1):67-77.
[20] WU Y,YING Y,JI Z Z,et al. Effective removal of pyrophosphate by Ca-Fe-LDH and its mechanism[J]. Chemical Engineering Journal,2012,179(1):72-79.
[21] ZHOU J,XU Z P,QIAO S,et al. Enhanced removal of triphosphate by Mg CaFe-Cl-LDH:synergism of precipitation with intercalation and surface uptake[J]. Journal of Hazardous Materials,2011,189(1):586-594.
[22]郭亚祺,杨洋,伍新花,等.煅烧的水滑石同时去除水体中砷和氟[J].环境工程学报,2014,8(6):2485-2491.GUO Y Q,YANG Y,WU X H,et al. Removal of arsenate and fluoride in water by calcined layered double hydroxides[J].Chinese Journal of Environmental Engineering,2014,8(6):2485-2491.
[23]唐朝春,陈惠民,刘名,等. ZnAl和Mg Al水滑石吸附废水中磷的研究进展[J].化工进展,2015,34(1):245-251.TANG C C,CHEN H M,LIU M,et al. Advances in adsorption of phosphate in wastewater by ZnAl and Mg Al hydrotalcite[J].Chemical Industry and Engineering Progress,2015,34(1):245-251.