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PREPARASI KOMPOSIT MAGNETIT@ZEOLIT DARI PASIR BESI DAN ZEOLIT ALAM SEBAGAI ADSORBEN Cr(III)

IRVAN SATRIA AJI, Dr. Suyanta, M.Si; Prof. Indriana Kartini, M.Si., Ph.D

2022 | Skripsi | S1 KIMIA

Preparasi komposit magnetit@zeolit berbahan dasar pasir besi dan zeolit alam telah dilakukan sebagai adsorben Cr(III). Pada penelitian ini bertujuan untuk mempelajari pengaruh NaOH terhadap isolasi magnetit dari pasi besi alam, mempelajari stabilitas komposit magnetit@zeolit dan penentuan pHpzc, serta mengkaji kinetika adsorpsi ion logam Cr(III) dengan adsorben komposit magnetit@zeolit. Komposit magnetit@zeolit berbahan dasar pasir besi dan zeolit alam. Magnetit diperoleh dari proses isolasi dari pasir besi menggunakan larutan NaOH dengan variasi konsentrasi 2,00; 4,00; 6,00; 8,00 M sedangkan zeolit alam diaktivasi menggunakan larutan HCl 3,00 M. Pembentukan komposit magnetit@zeolit dilakukan dengan metode kopresipitasi diawali dengan melarutkan magnetit dengan larutan HCl 37% dan ditambahkan zeolit alam teraktivasi dengan perbandingan massa 1:1 kemudian ditambahkan larutan NH4OH 12,5% hingga pH 11. Komposit dikarakterisasi dengan FTIR, XRD, SEM-EDX, TEM, VSM, diuji stabilitas dan penentuan pHpzc, serta dikaji kinetika dan isoterm adsorpsinya terhadap ion logam Cr(III). Hasil penelitian menunjukkan bahwa proses isolasi magnetit dari pasir besi menghasilkan hasil yang terbaik saat menggunakan larutan NaOH 2,00 M. Komposit magnetit@zeolit memiliki pHpzc 5,66 sehingga proses adsorpsi logam Cr(III) akan dilakukan pada pH > pHpzc. Pengkajian kinetika dan isoterm adsorpsi menunjukkan bahwa proses adsorpsi logam Cr(III) dengan adsorben komposit magnetit@zeolit mengikuti model kinetika pseudo orde kedua dan isoterm Langmuir.

The preparation of magnetite@zeolite composites based on iron sand and natural zeolite has been carried out as Cr(III) adsorbent. This study aims to study the effect of NaOH on the isolation of magnetite from natural iron sand, study the stability of magnetite@zeolite composites and determination of pHpzc, as well as examine the adsorption kinetics of Cr(III) metal ions with magnetite@zeolite composite adsorbents. Magnetite@zeolite composite made from iron sand and natural zeolite. Magnetite was obtained from the isolation process from iron sand using NaOH solution with various concentrations of 2.00; 4.00; 6.00; 8.00 M while natural zeolite was activated using 3.00 M HCl solution. The formation of magnetite@zeolite composites was carried out by the coprecipitation method, starting with dissolving magnetite with 37% HCl solution then activated natural zeolite with a mass ratio of 1:1 was added, followed by addition of 12.5% NH4OH solution to pH 11. The composites were characterized by FTIR, XRD, SEM-EDX, TEM, VSM, and it were tested for stability and determination of pHpzc, as well as kinetics and adsorption isotherms of metal ions Cr(III). The results showed that the best results were obtained on the use of 2.00 M NaOH in the process of isolating magnetite from iron sand. The magnetite@zeolite composite had a pHpzc of 5.66 so that the Cr(III) metal adsorption process would be carried out at pH > pHpzc. The study of kinetics and adsorption isotherm showed that the process of Cr(III) metal with magnetite@zeolite composite adsorbent followed the pseudo second order kinetic model and the Langmuir isotherm.

Kata Kunci : adsorpsi, Cr(III), pasir besi alam, zeolit alam

  1. S1-2022-409468-abstract.pdf  
  2. S1-2022-409468-bibliography.pdf  
  3. S1-2022-409468-tableofcontent.pdf  
  4. S1-2022-409468-title.pdf