Judul: Adsorption System of Composite Zeolite@AuNPs@MET were Synthesized by Binahong (Anredera cordifolia)Leaf Extract as Bioreductor
Abstrak: Berbagai penelitian telah dilakukan untuk mengurangi atau bahkan menghilangkan logam berat berbahaya dari limbah industri sebelum dibuang ke perairan. Adsorpsi dengan material berpori merupakan metode yang mudah dan sederhana, juga efektif untuk menghilangkan ion logam berat. Diantara jenis adsorben seperti karbon aktif, silika gel dan zeolit, zeolit merupakan material dengan bentuk kristal sangat teratur dengan rongga yang saling berhubungan ke segala arah.Untuk memperbaiki karakter zeolit alam sehingga dapat digunakan sebagai katalis, absorben, atau aplikasi lainnya, biasanya dilakukan aktivasi dan modifikasi terlebih dahulu (Yuanita 2010)., Various studies have been done to reduceoreven eliminate harmful heavymetals from industrial wastewater before discharge to waters. Adsorptionis a method that is often used because it’seasyandsimple, also effective to remove heavy metal ions. Among the various types of adsorbents such asactivated carbon, silicagel and zeolite, zeoliteis the best material to use because it has in sequence crystal form with cavities interconnected in all directions. To improve the character of natural zeolite that can be use dascatalysts, absorbents, orotherapplications, typically performed prior activation and modification (Yuanita 2010).
Keyword: adsorbent, bioreductor, binahong leaf, zeolite@AuNPs@MET

Judul: Literature Review on Composite Zeolites for the Adsorption of Heavy Metal Ions
Abstrak: Perairan merupakan sumber air yang sangat penting bagi kehidupan sehingga berbagai upaya dilakukan untuk membuat perairan terbebas dari ion-ion logam berat yang berbahaya, salah satunya ialah dengan metode adsorpsi. Zeolit merupakan salah satu adsorben yang umum digunakan pada saat ini untuk menghilangkan ion logam berat. Berkembangnya ilmu teknologi memungkinkan adsorben diperoleh melalui penggabungan dua material atau yang disebut komposit. Komposit dibentuk dengan tujuan meningkatkan kemampuan adsorben dalam menghilangkan ion logam berat. Ulasan ini akan memberikan informasi terkait komposit zeolit dengan kitosan, selulosa asetat dan karbon aktif pada beberapa logam berat. Penelitian dilakukan dengan mencari sumber informasi dalam beberapa pangkalan data ilmiah. Masing-masing komposit menunjukkan hasil adsorpsi yang bagus., Water bodies are crucial course of water for life, thus various efforts have been undertaken to rid these water sources of hazardous heavy metal ions, one of which involves adsorption methods. Zeolite is a commonly used adsorbent today to eliminate heavy metals ions. The advancement of science and technology has enabled the creation of composite materials, known as adsorbent for heavy metals ions, with the aim of enhancing their adsorption capacity. This review provides information on zeolite composites with chitosan, cellulose acetate, and activated carbon for several heavy metals. The research was conducted by sourcing information from various scientific databases. The obtained composites from these three materials indicate successful composite formation, as evidenced by the higher adsorption capacity values of the composites compared to their individual component materials.
Keyword: adsorption, activated carbon, chitosan, composite, zeolite

Judul: Uji Robust T2-Hotelling dengan Menggunakan Penduga Minimum Covariance Determinant
Abstrak: Hotelling’s T2 statistic is a good statistic for inference about the mean of a multivariate normal population. In Hotelling’s T2 statistic, approximation with Bonferroni confidence intervals provides shorter interval than T2 confidence intervals. Therefore, to find the mean of a multivariate normal population, simultaneous t-intervals based on the Bonferroni method is often applied. However, hypothesis test and confidence intervals based on T2 statistic can be significantly affected by outliers in a set of multivariate normal data. Therefore, to find a good estimator for the mean of a multivariate normal population, the Minimum Covariance Determinant (MCD) estimator is used. To increase the efficiency of the MCD estimator, this test statistic is applied using the reweighted MCD which gives weights to the mean and covariance based on the robust of the observations.
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