Afrianti, S., & Irni, J. (2020). Analisa tingkat pencemaran logam berat timbal (Pb) di Daerah Aliran Sungai Deli Sumatera Utara. Biolink (Jurnal Biologi Lingkungan Industri Kesehatan), 6(2), 153-161.

Dhaneswara, D., Fatriansyah, J. F., Situmorang, F. W., & Haqoh, A. N. (2020). Synthesis of Amorphous Silica from Rice Husk Ash: Comparing HCl and CH3COOH Acidification Methods and Various Alkaline Concentrations. International Journal of Technology, 11(1), 200–208. https://doi.org/10.14716/ijtech.v11i1.3335

Firdaus, M. L., Madina, F. E., Sasti, Y. F., Elvia, R., Ishmah, S. N., Eddy, D. R., & Cid-Andres, A. P. (2020). Silica extraction from beach sand for dyes removal: Isotherms, kinetics and thermodynamics. Rasayan Journal of Chemistry, 13(1), 249–254. https://doi.org/10.31788/RJC.2020.1315496

Fitri, N. H., Yuniwarti, E. Y. W., & Suedy, S. W. A. (2015). Effect of Psidium Guajava Linn . Leaves and Anacardium Occidentale Linn. Leaves on Wound Healing to Mus musculus Linn . SKIN. Traditional Medicine Journal, 20(January), 24–27.

Gunawan, G. M., Suhendar, D., Sundari, C. D. D., Ivansyah, A. L., Setiadji, S., & Rohmatulloh, Y. (2019). Sintesis Zeolit Silikalit-1 Menggunakan Limbah Tongkol Jagung sebagai Sumber Silika. Al-Kimiya, 4(2), 91–99. https://doi.org/10.15575/ak.v4i2.5089

Harimu, L., Rudi, L., Haetami, A., & Santoso, G. A. P. (2019). Studi Variasi Konsentrasi NaOH dan H2SO4 Untuk Memurnikan Silika Dari Abu Sekam Padi Sebagai Adsorben Ion Logam Pb2+ dan Cu2+. Indonesian Journal of Chemical Research, 6(2), 81-87.

Ishmah, S. N., Permana, M. D., Firdaus, M. L., & Eddy, D. R. (2020). Extraction of Silica from Bengkulu Beach Sand using Alkali Fusion Method. PENDIPA Journal of Science Education, 4(2), 1–5. https://doi.org/10.33369/pendipa.4.2.1-5

Juharna, F. M., Widowati, I., & Endrawati, H. (2022). Kandungan logam berat timbal (Pb) dan kromium (Cr) pada kerang hijau (Perna viridis) di Perairan Morosari, Sayung, Kabupaten Demak. Buletin Oseanografi Marina, 11(2), 139-148.

Liew, Y. M., Heah, C. Y., Mohd Mustafa, A. B., & Kamarudin, H. (2016). Structure and properties of clay-based geopolymer cements: A review. Progress in Materials Science, 83, 595–629. https://doi.org/10.1016/j.pmatsci.2016.08.002

Luthfiah, A., Deawati, Y., Lutfi Firdaus, M., Rahayu, I., & Eddy, D. R. (2021). Silica from natural sources: A review on the extraction and potential application as a supporting photocatalytic material for antibacterial activity. Science and Technology Indonesia, 6(3), 144–155. https://doi.org/10.26554/sti.2021.6.3.144-155

Machfiro, A., & Munasir, M. (2020). Nanopartikel Fe3O4@ SiO2 Untuk Aplikasi Penyerap Logam Cu2+ Dalam Air. Inovasi Fisika Indonesia, 9(1), 5-8.

Mateos, D., Valdez, B., Castillo, J. R., Nedev, N., Curiel, M., Perez, O., ... & Tiznado, H. (2019). Synthesis of high purity nickel oxide by a modified sol-gel method. Ceramics International, 45(9), 11403-11407.

Mawardi, (2013). Optimasi Tanah Napa Sebagai Adsorben Ion Logam Krom Dalam Limbah Cair. Laporan Penelitian, Perpustakaan UNP

Mawardi, M., Deyundha, D., Zainul, R., & Zalmi, P. R. (2018). Characterization of PCC Cement by Addition of Napa Soil from Subdistrict Sarilamak 50 Kota District as Alternative Additional Material for Semen Padang. IOP Conference Series: Materials Science and Engineering, 335(1). https://doi.org/10.1088/1757-899X/335/1/012034

Munasir, & Safitri, I. I. (2021). Hydrophobic Nanoparticles-Silica from Natural Sands with TMCS as Media. IOP Conference Series: Materials Science and Engineering, 1125(1), 012005. https://doi.org/10.1088/1757-899x/1125/1/012005

Nilmania, V., & Mawardi, M. (2022). Pengaruh Rasio Na2SiO3/NaOH sebagai Alkali Aktivator Terhadap Hilang Pijar dan Kehalusan Butiran Semen (Blaine Analysis) Geopolimer Berbasis Tanah Napa. Jurnal Periodic Jurusan Kimia UNP, 11(1), 18. https://doi.org/10.24036/p.v11i1.113373

Nurhasni. (2002). “Pengaruh Pemanasan Tanah Diatome Terhadap Kemampuan Adsorpsi Cd (II) Dalam Pelarut Air”. JSKA.Vol.VI.No.3.

Refida, 2001. Pengaruh Pemanasan Tanah Diatome Terhadap Kemampuan Adsorpsi Cd (II) Dalam Pelarut Air. JSKA.Vol.VI.No.3.

Retnosari, A. (2013). Ekstraksi dan Penentuan Kadar Silika (SiO2) Hasil Ekstraksi dari Abu Terbang (Fly Ash) Batubara. Universitas Jember, 1–56.

Salsabila, B., Nasra, E., Hardeli, H., Dewata, I., & Kurniawati, D. (2023). Pengaruh pH dan Konsentrasi pada Penyerapan Ion Logam Cu(II) Menggunakan Kulit Buah Matoa ( Pometia pinnata ). Periodic, 12(2), 36. https://doi.org/10.24036/periodic.v12i2.117510

Ternero, F., Rosa, L. G., Urban, P., Montes, J. M., & Cuevas, F. G. (2021). Influence of the total porosity on the properties of sintered materials—A review. Metals, 11(5), 730.

Wardiyati, S., Fisli, A., & Yusuf, S. (2018). Sintesis Nanokatalis Tio2 Anatase dalam Larutan Elektrolit dengan Metoda Sol Gel. Jurnal Sains Materi Indonesia, 15(3), 153-157.

Zein, R., Akmal, C., Safni, S., Fauzia, S. and Ramadhani, P. (2023) Banana Stem ( Musa balbisiana Colla ) as Potential Biosorbent to Remove, 45(3).