FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb2+ REMOVAL

The fabrication of Mg-Zn-Al Hydrotalcite (HT) was carried out by the co-precipitation method at various molar ratios. The Mg-Zn-Al HT compound at the optimum molar ratio was then calcined to determine the effect of calcination on the Pb2+ adsorption. The kinetics of the adsorption type was determined by applying pseudo first order and pseudo second order kinetics models. Meanwhile, to investigate the adsorption process, the Freundlich and Langmuir equations were applied to determine the adsorption isotherm. The results showed that the optimum Mg-Zn-Al HT was at a molar ratio of 3 : 1 : 1 with an adsorption efficiency of 73.16 %, while Mg-Zn-Al HT oxide increased the adsorption efficiency to 98.12 %. The optimum condition of Pb2+ removal using Mg-Zn-Al HT oxide was reached at pH 5 and a contact time of 30 minutes. The adsorption kinetics follows the pseudo second order kinetics model with a rate constant of 0.544 g/mg·min. The isotherm adsorption follows the Langmuir isotherm model with a maximum capacity of 3.916 mg/g and adsorption energy of 28.756 kJ/mol

SYNTHESIS OF Mg/Al HYDROTALCITE-LIKE FROM BRINE WATER AND ITS APPLICATION FOR METHYL ORANGE REMOVAL: A PRELIMINARY STUDY

The objective of this research is to synthesis of Mg/Al hydrotalcite-like (Mg/Al HTlc) from brine water and its application as a methyl orange (MO) removal. The research initiated with the synthesis of Mg/Al HTlc from brine water, which is well known as the desalination process wastewater. Characterization of the Mg/Al HTlc synthesized was confirmed through X-ray Diffraction and FT-IR Spectroscopy. The determination of optimum acidity, adsorption rate, and energy and capacity adsorption were studied. The result showed that pH 4 was the optimum acidity for the adsorption of MO on Mg/Al HTlc. MO was adsorbed at pseudo-second order adsorption rate of 1.03 × 105 g mol-1 min-1 on the Mg/Al HTlc. The adsorption data fitted well into the linearly transformed Freundlich equation. Keywords: adsorption, brine water, methyl orange, Mg/Al hydrotalcite-lik

Mg/Al HYDROTALCITE-LIKE SYNTHESIZED FROM BRINE WATER FOR EOSIN YELLOW REMOVAL

Attempts to synthesis of Mg/Al HTlc using magnesium from several raw material resources are widely investigated. One of raw material would purpose as source of magnesium to synthesis of Mg/Al HTlc is brine water which is well known as the desalination process wastewater. Mg/Al HTlc are widely investigated for their potential applications in research and industrial processes as adsorbents, anionic exchange, catalysts and /or catalyst precursors for the preparation of inorganic materials and pharmaceutical industry excipients. As adsorbents, Mg/Al HTlc are receiving greater interests in the environmental community due to their high adsorption capacity. However, there is no literature available on the synthesis of Mg/Al HTlc from brine water except from artificial seawater. The objective of this research is to synthesis of Mg/Al HTlc from brine water and its ability tested for eosin yellow (EY) removal. Characterization of the Mg/Al HTlc synthesized was confirmed through X-ray Diffraction and FT-IR Spectroscopy. The effect of various experimental parameters was investigated using a batch adsorption technique. In this manner, the adsorption isotherms, adsorption kinetics, and pH effects upon EY adsorption on Mg/Al HTlc were examined. The result showed that EY data fit well with the pseudo-second order kinetic model. The isothermal data could be well described by the Freundlich equation. The adsorption capacity was 2.41 × 10-1 mol g-1, and adsorption energy of EY was 24.89 kJ mol-1. Keywords: Mg/Al hydrotalcite-like, brine water, adsorption, eosin yellow, adsorption capacit

STUDI PENDAHULUAN PEMANFAATAN LIMBAH DESALINASI UNTUK PEMBUATAN Mg/Al HYDROTALCITE-LIKE SEBAGAI ADSORBEN METHYL ORANGE

The utilization of industrial wastewater into a versatile material that has been the focus of research for economics reasons, environmental and technical. One of the proposed industrial wastewater for a new useful material is wastewater from the desalination process which is also known as brine water. The magnesium content in brine water is able to used as a source of magnesium for the synthesis of Mg/Al hydrotalcite-like compound (Mg/Al HTlc). Mg/Al HTlc are widely investigated for their potential applications in research and industrial processes as adsorbents, catalysts and /or catalyst precursors and pharmaceutical industry excipients. As adsorbents, Mg/Al HTlc are receiving greater interests in the environmental community due to their high adsorption capacity. However, before using natural brine water, has conducted a preliminary study the synthesis of Mg/Al HTlc by using artificial brine water as a model of desalination wastewater. The objective of this research is to synthesis of Mg/Al HTlc from artificial brine water and its ability tested as a methyl orange (MO) adsorbents. The research initiated with the synthesis of Mg/Al HTlc from artificial brine water. Characterization of the Mg/Al HTlc synthesized was confirmed through X-ray Diffraction and FT-IR Spectroscopy. The determination of optimum acidity, adsorption rate, and energy and capacity adsorption were studied. The result showed that pH 3 was the optimum acidity for the adsorption of MO on Mg/Al HTlc. MO was adsorbed at first order adsorption rate of 7.30 × 10-4 s-1 on the Mg/ Al HTlc, the adsorption capacity and adsorption energy were 4.36 × 10-5 mol g-1 and 27.54 kJ mol-1, respectively. From the preparatory process and the synthesis of Mg/Al HTlc by using artificial brine water to provide the information that the byproduct of desalination processes (brine water) which are believed to be used for the synthesis of Mg / Al HTlc. Keywords: wastewater, desalination, Mg/Al hydrotalcite-like, artificial brine water, adsorption, methyl orang

The Effect Of Sulphur (S) Doping and K+ Adsorption To The Electronic Properties Of Graphene: A Study By DFTB Method

A study on the effect of S doping and K+ adsorption to the electronic properties of graphene has been conducted by DFTB (Density Functional Tight Binding) calculation. The supercell of 40 x 40 x 1 configured from the 4x4x1 unit cell of graphene was optimized. The calculation shows that the Fermi level of graphene shifted from -4.67 eV into -3.57 eV after S doping. In addition, the S presence caused the formation of gap within the Dirac K of valence band and conduction band. Meanwhile, K+ charge distribution was dominantly occurred within the S-graphene than the graphene

CHARACTERIZATION AND ACTIVATION OF NATURAL ZEOLIT FROM PONOROGO

Characterization and activation of Natural Zeolite from Ponorogo (ZAP) have been done to improve the quality of zeolite as porous material. Analysis of mineral composition is done using X-Ray Difraction (XRD), Fourier Transform-Infra Red (FTIR) Spectroscopy and metal analysis using Atomic Absorption Spectroscopy (AAS). Characterization of the activated zeolite covered about number of acidic sites, surface area, ratio Si/Al and metal composition (Na, Ca, K and Fe). Activated processes is done using various mineral acid, i.e HCl, HNO3, H2SO4 and HPO4 with each concentration at 1 M and 3 3 hours dipping. The result showed that ZAP has composition Ca-klinoptilolit (43.09 %), gismondin (17.57 %), modernit (4.21 %) and quartz (10.37 %). The most efectif of the acid to activate is HCl and is proved to absorp of Zn in waste water. The effect of chemical activation is increasing the ratio of Si/Al, increasing the surface area and reducing some metal composition.   Keywords: natural zeolite, chemical activation, porous materia

Pelatihan Keselamatan Bahan Gas Berbahaya Untuk Teknisi Mesin Pendingin

Pelatihan keselamatan bahan gas berbahaya untuk teknisi mesin pending telah dilaksanakan untuk teknisi mesin pendingin yang tergabung dalam paguyuban Aneka Jasa Teknik Surakarta (AJTS). Kecelakaan kerja berkaitan dengan gas freon banyak diberitakan di dunia maya. Paguyuban AJTS merupakan perkumpulan dari teknisi yang banyak berkecimpung sebagai teknisi mesin pendingin terutama AC, kulkas, dan freezer di Solo Raya. Pelatihan ini penting untuk dilakukan untuk membekali teknisi tersebut agar selamat dalam perakitan dan perbaikan mesin pendingin. Pelatihan ini dilaksanakan secara luring meliputi ceramah keselamatan bahan, praktek mengenal MSDS, dan praktek mendeteksi kebocoran gas freon menggunakan alat leaking detektor. Hasil pelatihan antara lain: peserta paham tentang bahaya gas freon dan pencegahan kecelakaan kerja dalam penanganan mesin pendingin. Pelatihan sangat bermanfaat bagi teknisi mesin pendingin terutama peserta pelatihan dan pembaca artikel ini, sehingga keselamatan kerja dapat tercapai

STRATEGI DIGITAL MARKETING PADA HASIL KERAJINAN BORDIR PAYET DI DESA SIDOWARNO, WONOSARI, KLATEN

Bordir payet merupakan salah satu kerajinan yang digunakan sebagai pelengkap keindahan busana. Payet berupa manik-manik dirangkai satu per satu sampai menghasilkan suatu pola tertentu untuk memperindah busana. Bordir payet merupakan salah satu produk kerajinan dari Desa Sidowarno yang memiliki potensi besar, tetapi sebagian besar pengrajin melakukan pemasaran masih secara konvensional sehingga penjualan tidak dapat maksimal. Pada era digitalisasi ini, pemasaran bisa lebih efektif sesuai dengan perkembangan zaman. Oleh karena itu, Tim PPK Ormawa SIM UNS melaksanakan program pengabdian Di Desa Sidowarno dengan tujuan memberikan pendampingan terkait strategi digital marketing guna meningkatkan pemasaran hasil kerajinan bordir payet. Berdasarkan observasi dan wawancara kepada pengrajin payet Di Desa Sidowarno, tim melakukan analisis untuk solusi yang dapat diberikan. Para pengrajin dikumpulkan dalam sebuah kelompok usaha yang bernama Kelompok Bordir Payet Cahaya Berdikari. Kemudian, tim memberikan fasilitas guna pengembangan digital marketing, yaitu melalui pembuatan akun Shopee dan Instagram guna realisasi pemasaran produk secara online. Dengan demikian, penjualan produk kerajinan payet lebih meningkat. Selain itu, dengan adanya koordinasi promosi satu pintu dari kelompok maka tidak terjadi ketimpangan dan persaingan harga antar pengrajin

SINTESIS SENYAWA HYDROTAICITE-LIKE BERBAHAN DASAR MAGNESIUM DARI BRINE WATER DAN UJI KEMAMPUANNYA SEBAGAI SORBEN SPESIES ORGANIK ANIONIK

Sintesis senyawa hydrotaicite-like (HTlc) telah dilakukan menggunakan magnesium dari brine water (limbah proses desalinasi) dan brine water tiruan. Dalam preparasinya, larutan Na2CO3 0,1 M ditambahkan ke dalam brine water yang telah bebas ion kalsium serta mengandung AICl3 dengan rasio mol awal Mg/Al 2,0 hingga tercapai pH 10,5. Larutan tersebut kemudian diaduk terus menerus selama 1 jam pada suhu 70°C. Setelah pendinginan, sampel yang masih berwujud seperti bubur disaring, lalu dicuci dengan air terdistilasi ulang hingga tidak mengandung ion klorida dan setelah itu dikeringkan semalam dengan evaporasi vakum. Pada sintesis HTlc dari brine water tiruan, sebagian sampel yang telah berwujud bubur diperlakukan pemeraman dan hidrotermal. Selanjutnya, hasil sintesis setelah perlakuan pemeraman diperlakukan seperti perlakuan terhadap sampel sebelumnya. Karakterisasi padatan sampel dilakukan dengan difraksi sinar X, spektroskopi FT-IR, SEM dan alat analisis adsorpsi gas N2 untuk pengukuran luas muka. Pola-pola XRD menunj.ukkan adanya kenaikan kristalinitas dengan bertambahnya suhu hidrotermal dan/ atau waktu pemeraman. Selain itu, hasil studi saat ini telah dapat menunjukkan adanya refleksi (003) sekitar 7,583Å, yang merupakan ciri dari Mg/ Al HTIc dengan antar-lapisnya karbonat. Senyawa Mg/ Al HTlc basil sintesis diuji kemampuannya sebagai sorben untuk menghilangkan spesies organik anionik dengan model zat warna eosin yellow dan methyl orange. Parameter-parameter yang diselidiki dalam penelitian ini adalah pengaruh keasaman medium saat sorpsi, konstanta laju sorpsi, kapasitas sorpsi Langmuir (satu lapis) dan Freundlich (banyak lapis) dan energi sorpsi. Kapasitas sorpsi satu lapis (b) dan energi sorpsi (E) ditentukan menurut model isotherm Langmuir, sedangkan kapasitas sorpsi banyak lapis (B) ditentukan berdasarkan model isotherm Freundlich. Hasil uji sorpsi menunjukkan bahwa proses sorpsi dapat dijelaskan dengan baik oleh model pseudo-order dua dan model isotherm Freundlich. Karena asil kapasitas sorpsi senyawa Mg/ Al HTlc relatif tinggi, Mg/Al HTJc dapat dipertimbangkan sebagai material yang potensial untuk sorpsi spesies organik anionik di dalam sistem penanganan limbah cair