Arie Hardian

• Dr.
• Lecturer at Jenderal Achmad Yani University

Environmental analysis of waste generated from residual samples in a testing laboratory is necessary to mitigate its impact. This study aims to assess the performance of electrocoagulation (EC) using aluminum (Al) electrodes in reducing Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), and pH level in laboratory wastewater. This investigat...

Water pollution in Indonesia is a growing concern, necessitating the development of advanced treatment technologies. Membrane-based filtration, a promising approach due to its low energy consumption and ability to preserve material properties, has been explored. Polysulfone (PSf), a commonly used membrane material, is known for its thermal stabilit...

Vanadium (V)-doped Bi4Ti3O12 compound is reported to have good photocatalyst properties; however, efforts still need to improve the ability of the photocatalyst through various strategies, such as controlling the morphology and particle size. The molten salt method is one of the simple synthesis methods reported successful in synthesizing Bi4Ti3O12...

Polypyrrole (PPy) is widely regarded as a useful electrode material because it has the advantages of low cost, high electrical conductivity, and thermal stability. This study aimed to synthesize PPy membranes using polyphenol oxidase (PPO) isolated from white oyster mushrooms as a biocatalyst for processing textile wastewater. The membranes were pr...

Hydroxyapatite (HAp) is the main inorganic component that forms teeth and bones. The abundant limestone reservoir in Indonesia can be utilized as a natural resource for the green synthesis of hydroxyapatite. The objective of synthesizing Fe-doped hydroxyapatite/ZnO nanocomposites is to enhance the magnetic properties of hydroxyapatite, facilitating...

Lead sulfide (PbS) concentrate is derived from the sulfide mineral galena. In nature, galena must first undergo a concentration process to become PbS concentrate. The determination of lead (Pb) content in the PbS concentrate is carried out using complexometric methods, referring to the modified ISO 13545:2000 standard during the preparation stage....

Sfalerit adalah salah satu mineral bijih sulfida yang menjadi bahan baku konsentrat seng sulfida (ZnS). Sfalerit di alam perlu diolah melalui proses konsentrasi agar menjadi konsentrat ZnS yang tinggi nilai jual. Kadar seng (Zn) dalam konsentrat ZnS ditetapkan secara kompleksometri mengacu ISO 13658:2000 yang dimodifikasi pada tahap preparasi. Pene...

This research studied the synthesis of chitosan (CS) membrane with the basic component of polyphenol oxidase (PPO) from purple eggplant extract added with Cu2+ ions. The activity of the immobilized PPO in the CS-membrane was determined by the UV-visible spectrophotometer methods. The results showed that the membrane characteristics of CS-/PPO-Cu2+...

Currently in Indonesia, propellant research is still rarely carried out due to bureaucratic and budgetary problems. This study aimed to determine the optimum composition of propellant using local sources of nitrate compounds based on its combustion heat value and to study the effect of the composition on its combustion heat value. The propellant co...

SrBi4Ti4O15 is one of four-layered Aurivillius compound family member that can be used as photocatalyst material that works in the violet light region. To expand its work function range can be conducted by doped with metal elements to SrBi4Ti4O15 as results reduced its band gap energy. In this research, we synthesized vanadium doped SrBi4Ti4O15 (Sr...

The purpose of this research is to separate gadolinium(III) from terbium(III), by the liquid-liquid extraction method, with the extractant dibutyl dithiophosphate. Gadolinium(III) and terbium(III) have been selected in this study to see if the two metallic ions still could be separated although they have only one difference in atomic number, and in...

CaTiO3 as one of the perovskite-based photocatalysts has a band gap energy of 3.5 eV (~354 nm), thus will work at the ultraviolet light region. One of the strategies to decrease the band gap energy is doping metal. In this research, CaTiO3 was doped by Fe element as purposes to decreasing its band gap energy. Fe doped CaTiO3 compounds were synthesi...

Methylene blue, a basic dye that is important in the coloring process in the textile industry. However, the use of the dye Methylene blue is hazardous for the skin, the eyes, and swallowed. Three composition types of TiO 2 -NiFe 2 O 4 nanocomposites (75:25, 50:50, and 25:75) had been synthesized using a simple coprecipitation method. The photodegra...

NTC (Negative Temperature Coefficient) thermistors are widely used as temperature sensors in industrial and medical applications due to their high-temperature sensitivity, durability, and low cost. Generally, NTC thermistors are made from spinel structured ceramics formed by transition metal oxides with the general formula AB 2 O 4 . One of the spi...

Revegetation for reclamation is a strategic effort to overcome the negative impacts of coal mining. The growth of reclaimed vegetation has a positive impact in reducing soil density so that it is suitable for the growth of food plants, and also can increase the content of soil organic matter. One of the efforts to restore the function of post-minin...

Reclamation is an effort to repair the damaged mining sector to provide optimal benefits. This review article aims to propose a natural product technology approach to the reclamation of post-coal mining land by increasing the content of soil organic matter so that the post-mining land becomes fertile and can be used for agricultural land. The metho...

Rare earth elements are strategic materials, difficult to obtain, and have wide uses. Currently, it is still difficult to separate and refine REE’s because it has similar physical and chemical properties. Solvent extraction is most successful method used for the separation of REE’s. Di-2-ethylhexyl phosphoric acid has been widely used in industry f...

Methylene blue dyes are widely used in textile, batik, plastic, paper, and many other industries. The remain of methylene blue dyes in the textile waste is hazardous for health and the environment. Therefore, it takes effort to deal with it. One of the efforts is the process of adsorption using adsorbents. In this study, the adsorbent ZrSiO 4 /Fe 2...

This study aimed to determine the effect of calcination time on the properties of Al(OH) 3 or gibbsite nanoparticles in the sol-gel process, which was then used as the basic material in the manufacturing of water-Al(OH) 3 based nanofluids. Nanofluid is a mixture of basic fluids such as water with solid nanoparticles. Al(OH) 3 nanoparticles have bee...

Efforts to replace conventional fluids as coolants for heat transfers with new fluids are continuously being made to improve heat transfer efficiency. Nanofluids are currently widely studied around the world as candidates for conventional fluids substitutes. In this research, the synthesis of Al 2 O 3 -ZrO 2 nanocomposites for heat transfer nanoflu...

Expanded perlite is a multifunctional material that has been widely used in Industry. Its light, porous, and high-temperature resistance has made it well known used for lightweight and fire-resistant materials. In this study, the expanded perlite was prepared from perlite rock originally from Padang Pariaman district, West Sumatra, Indonesia, by co...

Karbon aktif dan TiO2 mereduksi SO2 melalui proses adsorpsi dan fotokatalitik. Kedua senyawa ini memiliki efektivitas adsorpsi rendah. Untuk meningkatkan aktivitas adsorpsi dilakukan kombinasi teknik adsorben dan fotokatalitik sehingga adsorpsi dapat optimal. Kombinasi dilakukan dengan membuat komposit karbon aktif/TiO2. Batubara dan semi-kokas dic...

A facile green route method has been developed for synthesis of carbon dot-coated silver nanocomposites ([email protected] NCs), in which fluorescent c-dots obtained from the rice straw waste were used as a reducing and stabilizing agent. To the best of our knowledge, this is the first study that reports the effect of c-dots coating on antibacteria...

The use of motorized transportation in Indonesia is now proliferating. The higher the use of motorized vehicle-based transportation in an area, the higher the potential for air pollution. One of the air pollutants is a mixture of benzene, toluene, ethylbenzene, and xylene (BTEX). This study examines the effect of coconut shell-derived activated car...

Three-layer Aurivillius compound bismuth titanate (Bi4Ti3O12) is well known for having interesting properties such as ferroelectric and photocatalyst. Many researchers reported that the unique plate-like shaped particle affecting ferroelectric and photocatalyst properties. The molten salt synthesis is the common simple method to obtain that unique...

Herein, we report the synthesis of hierarchical three-dimensional (3D) γ-Al2O3 flower-like particles composed of randomly arranged nanoplates via a reverse micelle-mediated solvothermal method. A systematic time-dependent study was performed to reveal the changes in phase composition of these hierarchical nanostructures during the synthesis process...

This research aims to make a polypyrrole (PPy) membrane and crude extract of polyphenol oxidase (PPO) as a membrane of mPPy/PPO apple extracts. The membrane of PPy/PPO-apple extract has been synthesized by the electrodeposition method. The electrolyte composition consists of a mixture of 0.10-0.20 M pyrrole (Py) and 50-100% PPO apple extract, which...

p> Metilen biru merupakan salah satu zat pewarna dalam limbah cair tekstil yang dapat merusak ekosistem perairan dan mempunyai nilai ambang batas 5 mg/L. Salah satu cara untuk mengolah MB dalam larutan yaitu dengan fotokatalisis mengingat sederhana, cepat, dan mudah diregenerasi. Namun, cara ini memiliki kekurangan yakni waktu pemisahan yang lama....

The development and validation of an analytical method for the simultaneous determination of Dextromethorphan Hydrobromide, Chlorpheniramine Maleate, and Potassium Sorbate in cough syrup using the High-Performance Liquid Chromatography (HPLC) method have been conducted. The determination was carried out on the simulation sample consisting of three...

Methylene blue (MB) is one of the dyes used often by the textile industry. Therefore, MB residual is contained in the textile industry waste. MB can irritate, leading to permanent eye and animal injuries; therefore, the textile industry waste concentration must be degraded before disposed to the environment. MB residual in textile industry waste ca...

Investigation into the solid-state transition among drug polymorphs has been more intense lately. Many factors induce the transformation of polymorphs during manufacturing processes. Efavirenz (EFV), an AIDS therapy drug, has more than 23 polymorphs, but very little information has been reported on them. This study aimed to perform a characterisati...

One of interesting properties of Bi 4 Ti 3 O 12 is photocatalyst. The band gap of Bi 4 Ti 3 O 12 is 2.9 eV as results only work at ultraviolet wavelength range. Metal doped to Bi 4 Ti 3 O 12 can reduce band gap energy. In this work, Bi 4 Ti 3 O 12 was doped vanadium (Bi 4 Ti 3- x V x O 12 with x = 0.05; 0.1; 0.15; 0.2) using solid state reaction me...

Surface area has significant impact on the photocatalytic activity of semiconductor material. It was found that templates as structure directing agent played a role in regulating the surface area of materials. The most widely used as template is cetyltrimethylammonium bromide (CTAB) surfactant. In this research, TiO2 was prepared by solvothermal me...

Monitoring the quality of the river is essentially to know the status of the periodic quality of the river. Good assessment of river water quality should use a combination of physical, chemical and biological parameters. One way that can be done to describe water quality in an area is the primary productivity in the water. Primary productivity is t...

Reducing a high-operating temperature of solid oxide fuel cell (SOFC) to intermediate temperature SOFC (IT-SOFC, 500-750oC) poses a great challenge in the sense of developing solid electrolyte at intermediate temperature range. In response to this, we report a novel composite La9.33Si6O26 (LSO) - Ce0.85Gd0.15O1.925 (CGO) in this study. The synthesi...

Nanofluida merupakan suatu suspensi stabil yang tersusun dari nanopartikel logam atau oksida logam dalam fluida dasar seperti air atau etilen glikol. Nanofluida air-ZrO2 memiliki potensi yang sangat besar sebagai material pemindah panas khususnya sebagai fluida pendingin pada reaktor nuklir. Pada penelitian ini, telah dilakukan sintesis nanopartike...

ABSTRAK Penelitian ini bertujuan untuk mengetahui pengaruh suhu kalsinasi terhadap karakteristik nanopartikel α-Fe 2 O 3 hasil proses sol-gel yang selanjutnya dijadikan sebagai bahan dasar pembuatan nanofluida air-Fe 2 O 3. Nanofluida merupakan campuran dari fluida dasar seperti air dengan partikel padat yang berukuran 1-100 nm. Nanopartikel α-Fe 2...

p>The aim of this work was to determine the effect of calcination temperature on the characteristics of Fe₂O₃ nanoparticles (NPs) in sol-gel synthesis. The obtained Fe₂O₃NPs was then used as material for preparation of Fe₂O₃-water nanofluids. Nanofluids is a mixture between basic fl...

Gadolinia doped ceria is one of good alternative electrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC). The use of plant extract in the material synthesis can be a low cost and environmentally friendly. In this work we have successfully synthesized 20%-gadolinia doped ceria (Ce0.8Gd0.2O1.9, GDC20) through sol gel method with citr...

A great challenge to reduce high operating temperature of solid oxide fuel cell (SOFC) to intermediate temperature SOFC (IT-SOFC, 500-750 ºC), is the development of solid electrolyte materials with high ionic conductivity at intermediate temperature range. In response to this challenge, here we report a novel composite material La9.33Si6O26 (LSO)-Z...

Doped ceria is a potential electrolyte for intermediate temperature solid oxide fuel cell (500-800°C) due to its higher conductivity than yttria-stabilized zirconia (YSZ). In this work, we have successfully synthesized Ce 0.85 Gd 0.05 Nd 0.1 O 1.925 (GNDC510) via citric acid complexation method. The electrolyte powder crystallized in a single fluor...

Doped ceria is believed as the promising candidate for IT-SOFC electrolyte. Codoped strategy can increase the conductivity of single doped ceria at lower operating temperature. The purposes of this research were to synthesize and characterize several codoped ceria Ce 1-x-y Gd x M y O 2-γ , M = Er, Dy, or Nd and 0.0 ≤ x,y ≤ 0.1. Solid state method w...

Ceria has higher conductivity than the conventional SOFC electrolyte, yttria-stabilized zirconia (YZS) but has the drawback of measurable electronic conductivity, particularly at high temperatures. The aims of this work research are to synthesize several Gd and Er co-doped ceria materials as solid electrolyte for Intermediate Temperature Solid Oxid...

Penelitian ini bertujuan untuk mendapatkan elektrolit redoks kristal cair ionik berbasis sumber terbarukan lokal untuk sel surya tersensitisasi zat warna (DSSC, Dye Sensitized Solar Cell). Sistem kristal cair ionik yang diharapkan diperoleh adalah garam iodida dari fatty imidazolinium. Pada penelitian ini telah berhasil disintesis tiga senyawa fatt...