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Mawardi Anwar

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Author-ID : 5345670

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology

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Pengaruh Konsentrasi Awal terhadap Penyerapan Ion Logam Cr+6 menggunakan Biomassa Alga Hijau Mougeotia Sp yang Diimobilisasi dengan Natrium Silika Mulya Dwi Arif; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Mougeotia Sp green algae biomass is a biosorbent used in the absorption of heavy metals in industrial waste, because of the presence of functional groups that bind to heavy metal ions. However, it has one disadvantage: it is easily damaged by other microorganisms. To improve the physical and chemical properties of algae it is necessary to immobilize the sodium silica. This study aims to determine the maximum absorption and absorption capacity of Cr+6 metal ions by immobilized green algae Mougeotia Sp using sodium silica with a contact technique using a column and measured by Atomic Absorption Spectrophotometer (AAS). The data obtained showed that the interaction between metal ions and the algal biomass of Mougeotia Sp immobilized on sodium silica obtained the optimum concentration at 250 mg /L. The maximum absorption capacity is 7.5815 mg / g with absorption efficiency of 52.0653%. Furthermore, characterization using FTIR shows that functional groups with active mean are silanol and siloxane which are the binding sites for functional groups such as cacbixyl, carbonyl and amines. The biosorption of Cr + 6 metal ions using Mougeotia Sp green algae biomass immobilized with sodium silica fulfills the Langmuir isotherm equation with a regression coefficient (R2) of 0.9294.

Pengaruh Konsentrasi Awal Larutan terhadap Penyerapan Ion Logam Berat Cr3+ Menggunakan Biomassa Alga Hijau Mougeotia sp. Yang Diimobilisasi Pada Natrium Silika Helmi Susanti; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Excessive heavy metal contamination in the environment can have negative effects on the environment and human health, one of which is the metal ion Cr3+. To overcome the increase in heavy metal ions, a biosorption method was used. Efforts made to increase the stability of biomass absorption are immobilization with sodium silica. Immoblization is the process of binding cells into the supporting matrix. The purpose of this study was to determine the optimum conditions for the absorption of Cr3+ metal ions, the initial concentration of the solution and the ratio of absorption to immobilized biomass. The results showed that the optimum absorption of Cr3+ metal ions occurred at the initial concentration of 250 mg/L solution and decreased with increasing concentration. The maximum absorption capacity obtained is 6.7409 mg/g. The biosorption of Cr3+ ions fulfills the Langmuir Isotherm equation with R2 of 0.898.

Pengaruh Konsentrasi Awal Larutan terhadap Penyerapan Ion Logam Berat Cr3+ menggunakan Biomassa Alga Hijau Mougeotia sp. yang Dimodifikasi dengan Metanol Hilmi Rahmadina; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Biosorption is an alternative method that can be used to overcome the presence of heavy metal chromium (III) in water. Green algae Mougeotia sp. Can be used as a biosorbent, because it has functional groups such as carboxyl, carbonyl, amine and hidroxyl. To find out how big the role of each functional group is modified. Where the functional group to be modified is the carboxyl group using methanol solution. In this research, the rebellion was carried out with a batch system, carried out by stirring the heavy metal solution with biosorbent then filtered, the resulting filtrate was analyzed using an Atomic Absorption Spectrophotometer (AAS). The variables to be tested is concentration. Based on the research results, the optimum absorption of green algae biomass Mougeotia sp. Against heavy metal ions Cr3+ took place at concentration of 250 mg/L with a maximum absorption capacity (qm) of 5.3050 mg/g. This biosorption process follows the Langmuir adsorption isotherm equation with an R2 value of 0.9412.

Sintesis Nanopartikel Magnetik Besi Oksida (Fe3O4) Metode Green Chemistry Dengan Ekstrak Daun Sirih Merah (Piper Crocatum) Rafiqa Khaira; Alizar Ulianas; Minda Azhar; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Magnetic nanoparticles have become an interesting topic in recent years, as magnetic nanoparticles have a greater degree of magnetism, high saturation magnetization, and ease of modification and handling. One of them is the Fe3O4 magnetic nanoparticles which are used in various fields, such as in the biomedical sector which acts as antibacterial, hyperthermia, anticancer, etc. This study aims to synthesize magnetic nanoparticles of iron oxide Fe3O4 using phenolic compounds contained in red betel leaf extract as a styling agent with a co-precipitation method based on green chemistry and to characterize them. The nanoparticles formed were measured for their magnetic force with a gaussmeter and characterized by functional groups, particle size and particle surface morphology using FTIR, XRD and SEM. The data obtained show that the optimal composition for the formation of Fe3O4 nanoparticles is to compare FeCl2: FeCl3 (0.01 mol: 0.02 mol) with a volume of 5 mL of red betel leaf extract which produces a force magnetic 0.16 mT. The characterization by FTIR shows the aromatic groups O-H, C = O carboxylate and C-H which indicate the presence of organic compounds, namely phenolic (gallic acid) which functions as a protective agent (styling agent) of Fe3O4. The XRD test obtained information on the average size of the formed nanoparticles based on the FWHM value (full width at half maximum) using Scherer's equation, which is 26.66 nm. Meanwhile, SEM data shows that the shape or morphology of the Fe3O4 magnetic nanoparticles is needle-like.Keywords — Nanoparticles, iron oxide Fe3O4, green chemistry, red betel leaf extract (Piper Crocatum)

PENGARUH KONSENTRASI AWAL LARUTAN ION LOGAM Cr+6 TERHADAP PENYERAPAN BIOMASSA ALGA HIJAU (Mougeotia sp.) YANG DIMODIFIKASI dengan METANOL Hervi Karlina; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Heavy metals are dangerous that can pollute the environtment and cause health problems because they are toxic and carcinogenic, one example is the metal ion Cr+6. On eway to overcome heavy metal ion in waste is the biosorption method. This research was conducted to determine the absorption capacity of green algae (Mougeotia sp.) biomass modified with methanol and determine the effect of initial concentration of the solution of Cr+6 metal ion. The result showed that the optimum absorption of Cr+6 metal ion by green algae (Mougeotia sp.) biomass modified with methanol was at concentration of 250 mg/L. The maximum absorption capacity (qm) obtained is 5,1020 mg/g. Cr+6 metal ion biosorption using green algae (Mougeotia sp.) biomass modified with methanol fulfils the Langmuir Isotherm equation with a coefficient value (R2) of 0,955.

Karakteristik Uji Blaine, Konsistensi Normal dan Waktu Pengikatan Semen yang Menggunakan Tanah Napa Sebagai Bahan Adiktif Mawardi Anwar; Riri Nofrita; Desy Kurniawati
Jurnal Periodic Jurusan Kimia UNP Vol 1, No 1 (2012)
Publisher : Departemen Kimia FMIPA UNP

It has been investigated about the analysis of characteristic, of cement which used the natural pozzolan in Aripan Solok region in analyzing the blaine, normal consistency and setting time. This research is aimed to recognize the infuencial characteristic of additional natural pozzolan to setting time, blaine and normal consistency. The testing characteristic of natural pozzolan to cement used devices vicat and blaine, the testing pracess was done in some variatation of percentage of 0%, 5% and 9.5 %. The result ot the reseach indicated that the characteristic of addition of natural pozzolan to cement which fulfil SNI 152049-2004 could make the setting time longer in cement hidration and it needed a big volume of water as the normal consistensy. Addition of natural pozzolan in cement will influence the blaine of cement it tells about the maximal addition of natural pozzolan 9.5 %to indicates the blaine of cement to be rough.

Pengaruh Waktu Kontak Terhadap Penyerapan Ion Logam Cr+6 Menggunakan Biomassa Alga Hijau (Mougeotia sp) Diah Febriani Saputri; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Chromium(VI) is a dangerous pollutant that the United States Envionmetal Protection Agency (US EPA) has identified as disturbing humans because of its toxicity. Even Cr (VI) is one of the most common pollutants is at number three in waters near industries. For this reason it is necessary to limit and overcome Cr (VI) in the waters. Biosorption is present as an alternative that can remove pollutants in waters by utilizing abundant natural materials. Green alga is one the natural materials used for biosorption. This is because the functional groups that exist on the surface of the cell walls play an important role in binding metals such as amides, amines, hydroxyl, carbonyl and carboxyl. This research was conducted using the Batch method with variations is contact time. The result showed that the optimum condition of contact time was 60 minutes with adsorption of 4,122 mg/ g.The characterization of green algae (Mougeotia sp) using FTIR was carried out to see the functional groups that play a role in adsorption Cr+6.

Co-Authors Alizar Ulianas DESY KURNIAWATI Diah Febriani Saputri Helmi Susanti Hervi Karlina Hilmi Rahmadina Minda Azhar Mulya Dwi Arif Rafiqa Khaira Riri Nofrita

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