TiO2@PLDOPA@Fe3O4 Nanokompozitinin Kurşun Adsorpsiyonunda Kullanımı ve PLDOPA Film Kalınlığının Adsorpsiyon Üzerine Etkisi

Year 2025, Volume: 15 Issue: 3, 1027 - 1045, 15.09.2025

Hayrunnisa Mazlumoğlu

https://doi.org/10.31466/kfbd.1594864

Abstract

Kurşun (Pb), eser miktarlarda bile çevre ve canlı organizmalar üzerinde ciddi olumsuz etkileri olan bir ağır metaldir. Bu problemlerin önüne geçmek için özellikle atık suda yer alan Pb (II) iyonlarının deşarj öncesi belirli standart değerlere indirilmesi gerekmektedir. Adsorpsiyon; kullanım kolaylığı, düşük işletme maliyeti, yüksek seçicilik, düşük atık üretimi gibi avantajlarından dolayı ağır metal gideriminde sıklıkla tercih edilmektedir. Adsorpsiyonda kilit rollerden biri, adsorban seçimidir ve geleneksel absorbanlara kıyasla birçok üstün özelliğe sahip nanoboyutlu adsorbanlar, son yıllarda yoğun ilgi görmektedir. Bu çalışmada TiO2@PLDOPA@Fe3O4 nanokompozitin, Pb (II) adsorpsiyonunda kullanımı ve PLDOPA film kalınlığının adsorpsiyon üzerine etkisi incelenmiştir. Sentezlenen nanokompozitin adsorpsiyon öncesinde ve sonrasında XRD, TEM ve EDX analizler ile karakterizasyonu yapılmıştır. Adsorpsiyon esnasında belirli sürelerde alınan numunelerden, manyetik alan aracılığıyla nanokompozit yapılar ayrılmış ve geri kalan çözeltide ICP-MS yardımı ile Pb (II) tayini yapılmıştır. Adsorpsiyon 3 saat içerisinde denge değerlerine ulaşmıştır. 3 saatlik polimerizasyonla elde edilen PLDOPA film kalınlığına sahip TiO2@PLDOPA@Fe3O4-2 nanokompoziti, en yüksek giderim oranı (%97) ve adsorpsiyon kapasitesi değerini (705 mg/g) vermiştir. Bu durum, adsorpsiyonun öncelikle film yüzeyinde biriken Fe3O4 nanopartikülleri üzerinde gerçekleşmesine dayandırılabilir. Karakterizasyon yorumlarıyla uyumlu olarak deneysel sonuçlar, TiO2@PLDOPA@Fe3O4 nanokompozitinin atık sudan Pb (II)'yi etkili bir şekilde giderebileceğini göstermektedir.

Keywords

Ağır metal giderimi , Kurşun adsorpsiyonu , TiO2 , Fe3O4 , PLDOPA

Use of TiO2@PLDOPA@Fe3O4 Nanocomposite for Lead Adsorption and Effect of PLDOPA Film Thickness on Adsorption

Abstract

Lead (Pb) is a heavy metal that has serious negative effects on the environment and living organisms, even in trace amounts. Pb (II) ions in wastewater should be reduced to a certain standard value before discharge to prevent these problems. Adsorption is a commonly used method for heavy metal removal due to its ease of use, low operating cost, high selectivity, and low waste production. The selection of an adsorbent plays a crucial role in adsorption, and nano-sized adsorbents, which have many advantages over traditional absorbents, have recently received considerable attention. This study investigated TiO2@PLDOPA@Fe3O4 nanocomposite for Pb (II) adsorption and the effect of PLDOPA film thickness on adsorption. Synthesized nanocomposite was characterized by XRD, TEM, and EDX analyses before and after adsorption. Nanocomposites were separated from samples taken at certain times during adsorption by a magnetic field and Pb (II) was determined in the remaining solution through ICP-MS. The equilibrium value of adsorption was reached within three hours. TiO2@PLDOPA@Fe3O4-2 nanocomposite with PLDOPA film thickness obtained through three hours of polymerization achieved the highest removal rate (97%) and adsorption capacity (705 mg/g). This can be attributed to adsorption primarily occurring on Fe3O4 nanoparticles deposited on the film surface. In agreement with characterization comments, experimental results show that TiO2@PLDOPA@Fe3O4 nanocomposite can effectively remove Pb (II) from wastewater.

Keywords

Heavy metal removal , Lead adsorption , TiO2 , Fe3O4 , PLDOPA

References

• Abdel Maksoud, M.I.A. et al. 2020. “Insight on Water Remediation Application Using Magnetic Nanomaterials and Biosorbents.” Coordination Chemistry Reviews 403: 213096. https://linkinghub.elsevier.com/retrieve/pii/S0010854519305466.
• Ahmad, Tanweer et al. 2024. “Potentials of Orange Wastes in Wastewater Treatment Technology: A Comprehensive Review.” Journal of Water Process Engineering 67: 106113. https://linkinghub.elsevier.com/retrieve/pii/S221471442401345X.
• Albatrni, Hania, Hazim Qiblawey, and Muftah H. El-Naas. 2021. “Comparative Study between Adsorption and Membrane Technologies for the Removal of Mercury.” Separation and Purification Technology 257: 117833. https://linkinghub.elsevier.com/retrieve/pii/S1383586620323066.
• Ayodhya, Dasari. 2022. “A Review on Recent Advances in Selective and Sensitive Detection of Heavy Toxic Metal Ions in Water Using G-C 3 N 4 -Based Heterostructured Composites.” Materials Chemistry Frontiers 6(18): 2610–50. https://xlink.rsc.org/?DOI=D2QM00431C.
• Badruddoza, Abu Zayed M. et al. 2013. “Fe3O4/Cyclodextrin Polymer Nanocomposites for Selective Heavy Metals Removal from Industrial Wastewater.” Carbohydrate Polymers 91(1): 322–32. https://linkinghub.elsevier.com/retrieve/pii/S0144861712008041.
• Bagbi, Yana et al. 2016. “Lead (Pb2+) Adsorption by Monodispersed Magnetite Nanoparticles: Surface Analysis and Effects of Solution Chemistry.” Journal of Environmental Chemical Engineering 4(4): 4237–47. https://linkinghub.elsevier.com/retrieve/pii/S2213343716303414.
• Bakhtiari, Somayeh et al. 2024. “A Comprehensive Review on Green and Eco-Friendly Nano-Adsorbents for the Removal of Heavy Metal Ions: Synthesis, Adsorption Mechanisms, and Applications.” Current Pollution Reports 10(1): 1–39. https://link.springer.com/10.1007/s40726-023-00290-7.
• Balali-Mood, Mahdi et al. 2021. “Toxic Mechanisms of Five Heavy Metals: Mercury, Lead, Chromium, Cadmium, and Arsenic.” Frontiers in Pharmacology 12. https://www.frontiersin.org/articles/10.3389/fphar.2021.643972/full.
• Biswas, Anjana, B.P. Chandra, and Prathibha C. 2023. “Highly Efficient and Simultaneous Remediation of Heavy Metal Ions (Pb(II), Hg(II), As(V), As(III) and Cr(VI)) from Water Using Ce Intercalated and Ceria Decorated Titanate Nanotubes.” Applied Surface Science 612: 155841. https://linkinghub.elsevier.com/retrieve/pii/S0169433222033694.
• Briffa, Jessica, Emmanuel Sinagra, and Renald Blundell. 2020. “Heavy Metal Pollution in the Environment and Their Toxicological Effects on Humans.” Heliyon 6(9): e04691. https://linkinghub.elsevier.com/retrieve/pii/S2405844020315346.
• Cao, Zhan-fang et al. 2019. “In Situ Nano-Fe3O4/Triisopropanolamine Functionalized Graphene Oxide Composites to Enhance Pb2+ Ions Removal.” Colloids and Surfaces A: Physicochemical and Engineering Aspects 561: 209–17. https://linkinghub.elsevier.com/retrieve/pii/S0927775718311397.
• Chai, Wai Siong et al. 2021. “A Review on Conventional and Novel Materials towards Heavy Metal Adsorption in Wastewater Treatment Application.” Journal of Cleaner Production 296: 126589. https://linkinghub.elsevier.com/retrieve/pii/S095965262100809X.
• Chen, D., and R. Xu. 1998. “Hydrothermal Synthesis and Characterization of Nanocrystalline Fe3O4 Powders.” Materials Research Bulletin 33(7): 1015–21. https://linkinghub.elsevier.com/retrieve/pii/S0025540898000737.
• Cheng, Changming, Fangjie Xu, and Hongchen Gu. 2011. “Facile Synthesis and Morphology Evolution of Magnetic Iron Oxide Nanoparticles in Different Polyol Processes.” New Journal of Chemistry 35(5): 1072. https://xlink.rsc.org/?DOI=c0nj00986e.
• Chu, Yangyang et al. 2019. “Plasma Assisted-Synthesis of Magnetic TiO2/SiO2/Fe3O4-Polyacrylic Acid Microsphere and Its Application for Lead Removal from Water.” Science of The Total Environment 681: 124–32. https://linkinghub.elsevier.com/retrieve/pii/S0048969719320765.
• Duan, Yifei, Lingyi Yan, Zhengxiang Gao, and Yu Gou. 2023. “Lead Poisoning in a 6-Month-Old Infant: A Case Report.” Frontiers in Public Health 11. https://www.frontiersin.org/articles/10.3389/fpubh.2023.1132199/full.
• Esfandiari, Naeemeh, Mehrdad Kashefi, Mostafa Mirjalili, and Sima Afsharnezhad. 2020. “Role of Silica Mid-Layer in Thermal and Chemical Stability of Hierarchical Fe3O4-SiO2-TiO2 Nanoparticles for Improvement of Lead Adsorption: Kinetics, Thermodynamic and Deep XPS Investigation.” Materials Science and Engineering: B 262: 114690. https://linkinghub.elsevier.com/retrieve/pii/S0921510720301975.
• Fei, Yuhuan, and Yun Hang Hu. 2022. “Design, Synthesis, and Performance of Adsorbents for Heavy Metal Removal from Wastewater: A Review.” Journal of Materials Chemistry A 10(3): 1047–85. https://xlink.rsc.org/?DOI=D1TA06612A.
• Fu, Fenglian, and Qi Wang. 2011. “Removal of Heavy Metal Ions from Wastewaters: A Review.” Journal of Environmental Management 92(3): 407–18. https://linkinghub.elsevier.com/retrieve/pii/S0301479710004147.
• Gan, Wei et al. 2019. “Achieving High Adsorption Capacity and Ultrafast Removal of Methylene Blue and Pb2+ by Graphene-like TiO2@C.” Colloids and Surfaces A: Physicochemical and Engineering Aspects 561: 218–25. https://linkinghub.elsevier.com/retrieve/pii/S0927775718311531.
• Giraldo, Liliana, Alessandro Erto, and Juan Carlos Moreno-Piraján. 2013. “Magnetite Nanoparticles for Removal of Heavy Metals from Aqueous Solutions: Synthesis and Characterization.” Adsorption 19(2–4): 465–74. http://link.springer.com/10.1007/s10450-012-9468-1.
• Goyer, R A. 1993. “Lead Toxicity: Current Concerns.” Environmental Health Perspectives 100: 177–87. https://ehp.niehs.nih.gov/doi/10.1289/ehp.93100177.
• Gupta, Archana et al. 2021. “A Review of Adsorbents for Heavy Metal Decontamination: Growing Approach to Wastewater Treatment.” Materials 14(16): 4702. https://www.mdpi.com/1996-1944/14/16/4702.
• Gupta, Kanika, Pratiksha Joshi, Rashi Gusain, and Om P. Khatri. 2021. “Recent Advances in Adsorptive Removal of Heavy Metal and Metalloid Ions by Metal Oxide-Based Nanomaterials.” Coordination Chemistry Reviews 445: 214100. https://linkinghub.elsevier.com/retrieve/pii/S001085452100374X.
• Huang, Qiqi et al. 2018. “Magnetic Graphene Oxide/MgAl-Layered Double Hydroxide Nanocomposite: One-Pot Solvothermal Synthesis, Adsorption Performance and Mechanisms for Pb2+, Cd2+, and Cu2+.” Chemical Engineering Journal 341: 1–9. https://linkinghub.elsevier.com/retrieve/pii/S1385894718301785.
• Jaworowski, Zbigniew, Francis Barbalat, Claude Blain, and Evelyn Peyre. 1985. “Heavy Metals in Human and Animal Bones from Ancient and Contemporary France.” Science of The Total Environment 43(1–2): 103–26. https://linkinghub.elsevier.com/retrieve/pii/0048969785900348.
• Jiang, Huabin et al. 2020. “Preparation of a Novel Bio-Adsorbent of Sodium Alginate Grafted Polyacrylamide/Graphene Oxide Hydrogel for the Adsorption of Heavy Metal Ion.” Science of The Total Environment 744: 140653. https://linkinghub.elsevier.com/retrieve/pii/S0048969720341759.
• Kanakaraju, Devagi, Mohamad Azim Bin Abdullah, and Lim Ying Chin. 2021. “TiO2/PKSAC Functionalized with Fe3O4 for Efficient Concurrent Removal of Heavy Metal Ions from Water.” Colloid and Interface Science Communications 40: 100353. https://linkinghub.elsevier.com/retrieve/pii/S2215038220301333.
• Karami, Hassan. 2013. “Heavy Metal Removal from Water by Magnetite Nanorods.” Chemical Engineering Journal 219: 209–16. https://linkinghub.elsevier.com/retrieve/pii/S1385894713000624.
• Karapinar, Hacer Sibel, Fevzi Kilicel, Faruk Ozel, and Adem Sarilmaz. 2023. “Fast and Effective Removal of Pb(II), Cu(II) and Ni(II) Ions from Aqueous Solutions with TiO2 Nanofibers: Synthesis, Adsorption-Desorption Process and Kinetic Studies.” International Journal of Environmental Analytical Chemistry 103(16): 4731–51. https://www.tandfonline.com/doi/full/10.1080/03067319.2021.1931162.
• Khan, Anoar Ali, and Madhumanti Mondal. 2021. “Low-Cost Adsorbents, Removal Techniques, and Heavy Metal Removal Efficiency.” In New Trends in Removal of Heavy Metals from Industrial Wastewater, Elsevier, 83–103. https://linkinghub.elsevier.com/retrieve/pii/B9780128229651000040.
• Khan, Fahad Saleem Ahmed et al. 2020. “Magnetic Nanoadsorbents’ Potential Route for Heavy Metals Removal—a Review.” Environmental Science and Pollution Research 27(19): 24342–56. https://link.springer.com/10.1007/s11356-020-08711-6.
• Khanna, Mansi et al. 2020. “Rapid Removal of Lead(II) Ions from Water Using Iron Oxide–Tea Waste Nanocomposite – a Kinetic Study.” IET Nanobiotechnology 14(4): 275–80. https://onlinelibrary.wiley.com/doi/10.1049/iet-nbt.2019.0312.
• Khashan, Saud et al. 2017. “Novel Method for Synthesis of Fe3O4@TiO2 Core/Shell Nanoparticles.” Surface and Coatings Technology 322: 92–98. https://linkinghub.elsevier.com/retrieve/pii/S0257897217305212.
• Kim, Hwan-Cheol et al. 2015. “Evaluation and Management of Lead Exposure.” Annals of Occupational and Environmental Medicine 27(1): 30. https://aoemj.org/journal/view.php?doi=10.1186/s40557-015-0085-9.
• Li, Hanyu, Yi Huang, Jianing Liu, and Haoran Duan. 2021. “Hydrothermally Synthesized Titanate Nanomaterials for the Removal of Heavy Metals and Radionuclides from Water: A Review.” Chemosphere 282: 131046. https://linkinghub.elsevier.com/retrieve/pii/S0045653521015186.
• Liang, Xue Xue et al. 2019. “Efficient Adsorption of Pb(II) from Aqueous Solutions Using Aminopropyltriethoxysilane-Modified Magnetic Attapulgite@chitosan (APTS-Fe3O4/APT@CS) Composite Hydrogel Beads.” International Journal of Biological Macromolecules 137: 741–50. https://linkinghub.elsevier.com/retrieve/pii/S0141813019319828.
• Lin, Ze, Xiulan Weng, Gary Owens, and Zuliang Chen. 2020. “Simultaneous Removal of Pb(II) and Rifampicin from Wastewater by Iron Nanoparticles Synthesized by a Tea Extract.” Journal of Cleaner Production 242: 118476. https://linkinghub.elsevier.com/retrieve/pii/S0959652619333463.
• Mahmood, Samar et al. 2024. “Assessing the Multi-Dimensional Impact of Lead-Induced Toxicity on Collembola Found in Maize Fields: From Oxidative Stress to Genetic Disruptions.” Mutation Research - Genetic Toxicology and Environmental Mutagenesis 898: 503789. https://linkinghub.elsevier.com/retrieve/pii/S1383571824000652.
• Mazlumoğlu, Hayrunnisa, and Şule Binici. 2024. “Effect of Temperature and Agitation Speed on Adsorption Activity of TiO2/PLDOPA/Fe3O4 Nanocomposite for Lead Removal.” In First International Congress on Trends and Advances in Global Research and Applications TAGRA 2024, eds. Hayrunnisa NADAROĞLU, Kaan YEŞİLYURT, and Hilal Kübra SAĞLAM. Erzurum, 120. https://congreteria.com/e/tagra2024 .
• Mazlumoglu, Hayrunnisa, and Mehmet Yilmaz. 2021. “Silver Nanoparticle-Decorated Titanium Dioxide Nanowire Systems via Bioinspired Poly( l -DOPA) Thin Film as a Surface-Enhanced Raman Spectroscopy (SERS) Platform, and Photocatalyst.” Physical Chemistry Chemical Physics 23(23): 13396–404. http://xlink.rsc.org/?DOI=D1CP01322J.
• Moradi, Atefeh, Peyman Najafi Moghadam, Reza Hasanzadeh, and Mika Sillanpää. 2017. “Chelating Magnetic Nanocomposite for the Rapid Removal of Pb(II) Ions from Aqueous Solutions: Characterization, Kinetic, Isotherm and Thermodynamic Studies.” RSC Advances 7(1): 433–48. https://xlink.rsc.org/?DOI=C6RA26356A.
• Morozov, Roman et al. 2018. “Microporous Composite SiO2-TiO2 Spheres Prepared via the Peroxo Route: Lead(II) Removal in Aqueous Media.” Journal of Non-Crystalline Solids 497: 71–81. https://linkinghub.elsevier.com/retrieve/pii/S0022309317306348.
• Munir, Naveed et al. 2021. “Heavy Metal Contamination of Natural Foods Is a Serious Health Issue: A Review.” Sustainability 14(1): 161. https://www.mdpi.com/2071-1050/14/1/161.
• Nassar, Nashaat N. 2010. “Rapid Removal and Recovery of Pb(II) from Wastewater by Magnetic Nanoadsorbents.” Journal of Hazardous Materials 184(1–3): 538–46. https://linkinghub.elsevier.com/retrieve/pii/S030438941001085X.
• Özlem Kocabaş-Ataklı, Züleyha, and Yuda Yürüm. 2013. “Synthesis and Characterization of Anatase Nanoadsorbent and Application in Removal of Lead, Copper and Arsenic from Water.” Chemical Engineering Journal 225: 625–35. https://linkinghub.elsevier.com/retrieve/pii/S1385894713004415.
• Polat, Tolgahan, Sule Binici, and Hayrunnisa Mazlumoğlu. 2025. “Nickel Removal from Aqueous Solution Through Magnetite Nanoparticles Decorated Titanium Dioxide Nanoflowers.” In 1st International Manas Congress on Science and Technology (TURK 2025), eds. Hayrunnisa NADAROĞLU et al. Erzurum, 256. https://ekitap.atauni.edu.tr/index.php/product/1st-international-manas-congress-on-science-and-technology-turk-2025/.
• Poursani, Afshin Shokati et al. 2016. “The Synthesis of Nano TiO2 and Its Use for Removal of Lead Ions from Aqueous Solution.” Journal of Water Resource and Protection 08(04): 438–48. http://www.scirp.org/journal/doi.aspx?DOI=10.4236/jwarp.2016.84037.
• Qasem, Naef A. A., Ramy H. Mohammed, and Dahiru U. Lawal. 2021. “Removal of Heavy Metal Ions from Wastewater: A Comprehensive and Critical Review.” npj Clean Water 4(1): 36. https://www.nature.com/articles/s41545-021-00127-0.
• Rajput, Shalini, Charles U. Pittman, and Dinesh Mohan. 2016. “Magnetic Magnetite (Fe3O4) Nanoparticle Synthesis and Applications for Lead (Pb2+) and Chromium (Cr6+) Removal from Water.” Journal of Colloid and Interface Science 468: 334–46. https://linkinghub.elsevier.com/retrieve/pii/S0021979715303921.
• Rehman, Mahfooz-ur et al. 2019. “Adsorption Mechanism of Pb2+ Ions by Fe3O4, SnO2, and TiO2 Nanoparticles.” Environmental Science and Pollution Research 26(19): 19968–81. http://link.springer.com/10.1007/s11356-019-05276-x.
• Sadeghi, Mohammad Mehdi, Ali Shokuhi Rad, Mehdi Ardjmand, and Ali Mirabi. 2018. “Preparation of Magnetic Nanocomposite Based on Polyaniline/Fe3O4 towards Removal of Lead (II) Ions from Real Samples.” Synthetic Metals 245: 1–9. https://linkinghub.elsevier.com/retrieve/pii/S0379677918302030.
• Saleh, Mahmoud G.A., Abdelrahman A. Badawy, and Ahmed F. Ghanem. 2019. “Using of Titanate Nanowires in Removal of Lead Ions from Waste Water and Its Biological Activity.” Inorganic Chemistry Communications 108: 107508. https://linkinghub.elsevier.com/retrieve/pii/S1387700319303806.
• Sankaran, Revathy et al. 2020. “Feasibility Assessment of Removal of Heavy Metals and Soluble Microbial Products from Aqueous Solutions Using Eggshell Wastes.” Clean Technologies and Environmental Policy 22(4): 773–86. http://link.springer.com/10.1007/s10098-019-01792-z.
• Sarkar, Arpan, and Biswajit Paul. 2021. “Synthesis, Characterization of Iron-Doped TiO2(B) Nanoribbons for the Adsorption of As(III) from Drinking Water and Evaluating the Performance from the Perspective of Physical Chemistry.” Journal of Molecular Liquids 322: 114556. https://linkinghub.elsevier.com/retrieve/pii/S0167732220354696.
• Sharma, Manisha, Jasminder Singh, Satyajit Hazra, and Soumen Basu. 2019. “Adsorption of Heavy Metal Ions by Mesoporous ZnO and TiO2@ZnO Monoliths: Adsorption and Kinetic Studies.” Microchemical Journal 145: 105–12. https://linkinghub.elsevier.com/retrieve/pii/S0026265X18310221.
• Sun, Daniel T. et al. 2018. “Rapid, Selective Heavy Metal Removal from Water by a Metal–Organic Framework/Polydopamine Composite.” ACS Central Science 4(3): 349–56. https://pubs.acs.org/doi/10.1021/acscentsci.7b00605.
• Tran, Thien-Khanh et al. 2024. “Applications of Engineered Biochar in Remediation of Heavy Metal(Loid)s Pollution from Wastewater: Current Perspectives toward Sustainable Development Goals.” Science of The Total Environment 926: 171859. https://linkinghub.elsevier.com/retrieve/pii/S0048969724020023.
• Wadhawan, Shweta, Ayushi Jain, Jasamrit Nayyar, and Surinder Kumar Mehta. 2020. “Role of Nanomaterials as Adsorbents in Heavy Metal Ion Removal from Waste Water: A Review.” Journal of Water Process Engineering 33: 101038. https://linkinghub.elsevier.com/retrieve/pii/S221471441930529X.
• Wang, Jiahong et al. 2010. “Amino-Functionalized Fe3O4@SiO2 Core–Shell Magnetic Nanomaterial as a Novel Adsorbent for Aqueous Heavy Metals Removal.” Journal of Colloid and Interface Science 349(1): 293–99. https://linkinghub.elsevier.com/retrieve/pii/S0021979710005199.
• Wang, Li et al. 2020. “Rational Design, Synthesis, Adsorption Principles and Applications of Metal Oxide Adsorbents: A Review.” Nanoscale 12(8): 4790–4815. https://xlink.rsc.org/?DOI=C9NR09274A.
• Wuana, Raymond A., and Felix E. Okieimen. 2011. “Heavy Metals in Contaminated Soils: A Review of Sources, Chemistry, Risks and Best Available Strategies for Remediation.” ISRN Ecology 2011: 1–20. https://www.hindawi.com/journals/isrn/2011/402647/.
• Xiong, Lin, Cheng Chen, Qing Chen, and Jinren Ni. 2011. “Adsorption of Pb(II) and Cd(II) from Aqueous Solutions Using Titanate Nanotubes Prepared via Hydrothermal Method.” Journal of Hazardous Materials 189(3): 741–48. https://linkinghub.elsevier.com/retrieve/pii/S0304389411003098.
• Yang, Hang et al. 2020. “Efficient and Rapid Removal of Pb2+ from Water by Magnetic Fe3O4@MnO2 Core-Shell Nanoflower Attached to Carbon Microtube: Adsorption Behavior and Process Study.” Journal of Colloid and Interface Science 563: 218–28. https://linkinghub.elsevier.com/retrieve/pii/S0021979719315309.
• Yang, Xiutao et al. 2022. “Enhanced Removal of Pb(II) from Contaminated Water by Hierarchical Titanate Microtube Derived from Titanium Glycolate.” Advanced Powder Technology 33(1): 103376. https://linkinghub.elsevier.com/retrieve/pii/S0921883121005653.
• Yin, Xianqiang et al. 2018. “Removal of V (V) and Pb (II) by Nanosized TiO2 and ZnO from Aqueous Solution.” Ecotoxicology and Environmental Safety 164: 510–19. https://linkinghub.elsevier.com/retrieve/pii/S0147651318308042.
• Zhai, Mudi et al. 2023. “Simultaneous Removal of Pharmaceuticals and Heavy Metals from Aqueous Phase via Adsorptive Strategy: A Critical Review.” Water Research 236: 119924. https://linkinghub.elsevier.com/retrieve/pii/S0043135423003603.
• Zhang, Jianming et al. 2013. “Pb(II) Removal of Fe3O4@SiO2–NH2 Core–Shell Nanomaterials Prepared via a Controllable Sol–Gel Process.” Chemical Engineering Journal 215–216: 461–71. https://linkinghub.elsevier.com/retrieve/pii/S1385894712014957.
• Zhang, Peng et al. 2023. “Water Quality Degradation Due to Heavy Metal Contamination: Health Impacts and Eco-Friendly Approaches for Heavy Metal Remediation.” Toxics 11(10): 828. https://www.mdpi.com/2305-6304/11/10/828.
• Zhang, Xingfei et al. 2023. “Selective Separation of Metals from Wastewater Using Sulfide Precipitation: A Critical Review in Agents, Operational Factors and Particle Aggregation.” Journal of Environmental Management 344: 118462. https://linkinghub.elsevier.com/retrieve/pii/S0301479723012501.
• Zhang, Y.X. et al. 2002. “Hydrothermal Synthesis and Photoluminescence of TiO2 Nanowires.” Chemical Physics Letters 365(3–4): 300–304. https://linkinghub.elsevier.com/retrieve/pii/S0009261402014999.
• Zhou, Qiaoqiao et al. 2020. “Total Concentrations and Sources of Heavy Metal Pollution in Global River and Lake Water Bodies from 1972 to 2017.” Global Ecology and Conservation 22: e00925. https://linkinghub.elsevier.com/retrieve/pii/S2351989419309357.