在ZnO吸附去除染料的实验中发现,在热解过程中控制醋酸锌的投料量,能调节ZnO吸附剂的表面结构。通过TEM、XRD、BET、XPS及Zeta电位等表征,发现醋酸锌投料量对ZnO吸附剂的粒径、比表面积、孔结构、表面物种及电荷分布有重要影响,加入更多醋酸锌制备的ZnO吸附剂具有更低的比表面积和较差的孔结构,且其表面元素的化学状态和电荷分布与低含量醋酸锌制备的ZnO明显不同。通过对刚果红染料的吸附测试,发现加入更多醋酸锌合成的ZnO吸附剂具有更加优异的染料移除性能,这是由于增加醋酸锌的含量后改变了ZnO表面结构,使其表面携带的正电荷增多,与刚果红分子之间发生更强的静电吸附作用,从而有利于去除刚果红染料。
In the experiment of dye adsorption over ZnO,it was found that the surface structure of the ZnO adsorbent could be adjusted by regulating the feed amount of zinc acetate during the pyrolysis process.Characterization using TEM,XRD,BET,XPS,and Zeta potential analysis revealed that the zinc acetate dosage could significantly influence the particle size,specific surface area,pore structure,surface species,and charge distribution of ZnO adsorbents.The ZnO adsorbent prepared with higher zinc acetate dosage had a lower specific surface area and poorer pore structure,and the chemical state and charge distribution of its surface were significantly different from those of ZnO prepared with lower zinc acetate content.Adsorption experiments using Congo red dye demonstrate that the ZnO adsorbent synthesized with higher zinc acetate dosage showed better dye removal performance.This was because the increase of zinc acetate improved the surface structure of the ZnO adsorbent and promoted the increase of positive charge carried on its surface,resulting in stronger electrostatic adsorption between ZnO and Congo red molecules,which was beneficial for removing Congo red dye.
[1] Elgarahy A M,Elwakeel K Z,Mohammad S H,et al.A critical review of biosorption of dyes,heavy metals and metalloids from wastewater as an efficient and green process[J].Cleaner Engineering and Technology,2021,4:100209.
[2] Shi Y W,Chang Q,Zhang T W,et al.A review on selective dye adsorption by different mechanisms[J].Journal of Environmental Chemical Engineering,2022,10(6):108639.
[3] Shi T Z,Xie Z F,Mo X L,et al.Highly efficient adsorption of heavy metals and cationic dyes by smart functionalized sodium alginate hydrogels[J].Gels,2022,8(6):343.
[4] Li J,Yang Z L,Ding T,et al.The role of surface functional groups of pectin and pectin-based materials on the adsorption of heavy metal ions and dyes[J].Carbohydrate Polymers,2022,276:118789.
[5] Si Y Y,Li J A,Cui B,et al.Janus phenol-formaldehyde resin and periodic mesoporous organic silica nanoadsorbent for the removal of heavy metal ions and organic dyes from polluted water[J].Advanced Composites and Hybrid Materials,2022,5(2):1180-1195.
[6] Rathi B S,Kumar P S.Application of adsorption process for effective removal of emerging contaminants from water and wastewater[J].Environmental Pollution,2021,280:116995.
[7] Sachin S,Pramanik B K,Singh N,et al.Fast and effective removal of Congo red by doped ZnO nanoparticles[J].Nanomaterials,2023,13(3):566.
[8] Debnath P,Mondal N K.Effective removal of Congo red dye from aqueous solution using biosynthesized zinc oxide nanoparticles[J].Environmental Nanotechnology,Monitoring & Management,2020,14:100320.
[9] Rambabu K,Bharath G,Banat F,et al.Green synthesis of zinc oxide nanoparticles using phoenix dactylifera waste as bioreductant for effective dye degradation and antibacterial performance in wastewater treatment[J].Journal of Hazardous Materials,2021,402:123560.
[10] Hojjati-Najafabadi A,Esfahani P N,Davar F,et al.Adsorptive removal of malachite green using novel GO@ZnO-NiFe2O4-αAl2O3 nanocomposites[J].Chemical Engineering Journal,2023,471:144485.
[11] 戴江东.ZnO基纳米材料的制备和结构及其处理污染的机理[D].成都:电子科技大学,2020.
[12] Singh G,Singh J,Jolly S S,et al.Fructose modified synthesis of ZnO nanoparticles and its application for removal of industrial pollutants from water[J].Journal of Materials Science:Materials in Electronics,2018,29(9):7364-7371.
[13] Chouchene B,Chaabane T B,Mozet K,et al.Porous Al-doped ZnO rods with selective adsorption properties[J].Applied Surface Science,2017,409:102-110.
[14] Xiao Z,Wan Z Y,Zhang J J,et al.Interstitial zinc defects enriched ZnO tuning O2 adsorption and conversion pathway for superior photocatalytic CH4 oxygenation[J].ACS Catalysis,2024,14(12):9104-9114.
[15] Xie H Y,Zhang G S,Xu J X,et al.Interfacial bonding of Co3O4 and oxygen vacancies engineering on ZnO induced efficient peroxymonosulfate activation and pollutants degradation[J].Journal of Colloid and Interface Science,2024,674:813-822.
[16] Wei Y J,Li Y,Xu Y F,et al.Synergy of oxygen vacancies and surface Zn in tuned ZnO crystal facets for enhanced CO2 cycloaddition to epoxides[J].Applied Catalysis B:Environment and Energy,2025,365:124878.
[17] Xiang Y,Liu Z,Cheng Z L.Diatomite supported highly-dispersed ZnO/Zn-co-embedded ZIF-8 derived porous carbon composites for adsorption desulfurization[J].Journal of Hazardous Materials,2024,471:134399.
[18] Hao Y S,Othman N,Zaini M A A.Waste newspaper as cellulose resource of activated carbon by sodium salts for methylene blue and Congo red removal[J].International Journal of Biological Macromolecules,2024,277:134353.
[19] Tang J,Zhang Y F,Liu Y,et al.Efficient ion-enhanced adsorption of Congo red on polyacrolein from aqueous solution:experiments,characterization and mechanism studies[J].Separation and Purification Technology,2020,252:117445.
[20] Sachin,Singh N,Shah K,et al.Synthesis and application of manganese-doped zinc oxide as a potential adsorbent for removal of Congo red dye from wastewater[J].Environmental Research,2023,233:116484.
[21] Trentini J D,Jaerger S,Balaba N,et al.Adsorptive removal of Congo red by macroporous ZnO obtained from citrus pectin gelation and reuse as a hybrid pigment[J].Particulate Science and Technology,2023,41(1):120-130.
[22] Rath P P,Behera S S,Priyadarshini B,et al.Influence of Mg doping on ZnO NPs for enhanced adsorption activity of Congo red dye[J].Applied Surface Science,2019,491:256-266.
[23] Madhusudan P,Lee C,Kim J O.Hierarchical ZnO/ZnFe2O4 yolk-shell adsorbent as a promising material for phosphate recovery and adsorption of organic pollutants from the simulated wastewater[J].Separation and Purification Technology,2024,348:127598.
PDF
