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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Indonesian Journal of Chemistry Molekul: Jurnal Ilmiah Kimia

Suherman, Suherman

Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Gadjah Mada

Author-ID : 748527

Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management

Published : 6 Documents Claim Missing Document

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Articles

Community Dynamics of Tanjung Obit Village, the Bacan Island, South Halmahera: a Social Resilience Perspective Kharirotul Suhaila; Suherman Suherman
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 7, No 3 (2021): September
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Tanjung Obit Village is one of the villages in Bacan Island, South Halmahera. Recently, Tanjung Obit has socially and economically is developing rapidly because its main economic activities are driven by gold and bacan stone mines. Besides this, Tanjung Obit Village has the potential of natural resources in the form of plantations and fisheries which are very abundant. Mining activities and natural resource management activities affect people’s lives there, especially in terms of the economic aspect. The study aimed to understand and analyze the social resilience of the community. The data collection was conducted through interviewing community leaders, asking the village residents to complete a questionnaire and field observations of the village. The findings of the study showed that in their daily life, people had maintained their social and social resiliencies. In terms of the economic aspect, the optimization of natural resources potentials was very important to improve their social welfare. In addition, by implementing the four aspects of social resiliencies comprising mimicking, adaptive, and transformative capacities as well as local wisdom, Tanjung Obit’s people had survived and been capable of developing themselves further in the future.

Toxicity test of desorbed chromium from polluted soil around tannery industry in Yogyakarta-Indonesia by using Brassica juncea and Helianthus annuus L. Suherman Suherman; Wina Akmarina; Wulandari Sutiawan; Nurul Hidayat Aprilita; Mudasir Mudasir; Kinichi Morita
Molekul Vol 14, No 2 (2019)
Publisher : Universitas Jenderal Soedirman

Indonesia’s target to be a new industrial country makes a wide chance in the developing of many industrial sectors. The main problem is the disruption of environmental balance due to poorly managed liquid waste released by the industry. Heavy metal such as chromium (Cr) is the typical pollutant generated from tannery industry in Indonesia. Toxicity test of desorbed chromium ions from polluted soil around tannery industry in Yogyakarta-Indonesia by using Brassica junceaand Helianthus annuus L.has been carried out. In this research, soil samples were dividedinto four sample points based on the distances from the waste water point sources. Metal content and some physico-chemical properties including ash content, total organic carbon, and cation exchange capacity were determined in this study. Furthermore, the chromium ions adsorption and desorption from polluted soils were investigated and measured by atomic adsorption spectrophotometry (AAS). Thus, ecotoxicity testsof soil eluates from desorption experiments wereperformed with Brassica junceaand Helianthus annuus L.The resultsshowed that sample III had the highestCr content at916mgkg–1.The adsorption isotherm of Cr ions into soils followed Langmuir isotherm with the highest maximum adsorption capacity value at 14.286 mg kg-1in the sample point IV (unpolluted soil). The optimum desorption of chromium occurred at pH 3. Toxicity test showed that Cr ions had toxic effect to Brassica junceaand Helianthus annuus L.

EXAMINATION OF THE CHEMICAL PROPERTIES OF SEAWATER OF THE TAMBELAN ISLANDS Suherman Suherman; Hanif Budi Prayitno
Indonesian Journal of Chemistry Vol 12, No 3 (2012)
Publisher : Universitas Gadjah Mada

This research aims to investigate the quality of the Tambelan island waters as primary information to support these islands as a marine conservation area. Some chemical properties of seawater such as pH and DO (Dissolved Oxygen) were identified by portable instrumentations. Furthermore inorganic nutrients phosphate, nitrate, and silicate contents were measured according to the methods developed by Morris and Riley in 1963 and then modified by Strickland and Parsons in 1968. The results of the research show that the pH values were in the range of 8.06 to 8.30, and the DO level amounted to 5.26 to 6.31 mg/L. Further results from this research show that the content of phosphate and nitrate ranged from 0.001 to 0.004 mg/L and 0.005 to 0.018 mg/L, respectively. Meanwhile, the content of silicate was found to be 0.063 to 0.134 mg/L in the archipelagic waters of Tambelan. The values of the above parameters are in accordance with the range of the seawater quality as recommended by the Ministry of Environment of the Republic of Indonesia. Therefore, good water quality of the Tambelan islands provides great opportunities to be developed as a marine conservation area.

The Physico-Mechanical Properties and Release Kinetics of Eugenol in Chitosan-Alginate Polyelectrolyte Complex Films as Active Food Packaging Baiq Amelia Riyandari; Suherman Suherman; Dwi Siswanta
Indonesian Journal of Chemistry Vol 18, No 1 (2018)
Publisher : Universitas Gadjah Mada

A study of eugenol release and its kinetics model from chitosan-alginate polyelectrolyte complex (PEC) films has been conducted. Some factors that affected the eugenol release were also studied, including the composition of chitosan-alginate PEC and the concentration of eugenol. The chitosan-alginate-eugenol PEC films were synthesized at pH ± 4.0, then the PEC films were characterized using a Fourier-transform infrared spectroscopy (FTIR) spectrophotometer. An investigation of the films’ properties was also conducted, including morphology analysis using a scanning electron microscope (SEM), differential thermal analysis (DTA) / thermogravimetric analysis (TGA), mechanical strength, transparency testing, water absorption, and water vapor permeability. The release of eugenol was investigated through in vitro assay in ethanol 96% (v/v) for four days, and the concentration of eugenol was measured using an ultraviolet-visible (UV-Vis) spectrophotometer. The characterization of the films using FTIR showed that the formation of PEC occurred through ionic interaction between the amine groups (–NH3+)of the chitosan and the carboxylate groups (–COO–) of the alginate. The result showed that the composition of chitosan-alginate PEC and the concentration of eugenol can affect the release of eugenol from PEC films. A higher concentration of alginate and eugenol could increase the concentration of eugenol that was released from the films. The mechanism for the release of eugenol from chitosan-alginate PEC films followed the Korsmeyer-Peppas model with an n value of < 0.5, which means the release mechanism for eugenol was controlled by a Fickian diffusion process. The antioxidant activity assay of the films using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method resulted in a high radical scavenging activity (RSA) value of 55.99% in four days.

Carbon/Alginate/Chitosan Composite as a Sorbent for Solid-Phase Extraction and Preconcentration of Cu(II) Ahmad Akhib Ainul Yaqin; Suherman Suherman; Mudasir Mudasir; Dwi Siswanta
Indonesian Journal of Chemistry Vol 22, No 6 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.70587

Carbon/Alginate/Chitosan Composite (CAC) as a sorbent for solid-phase extraction of Cu(II) (pre-concentration) with atomic absorption spectrometry for analysis was successfully prepared. The sorbent was made with a mass ratio of chitosan:alginate:carbon = 1:1:1. CAC sorbents were characterized using FTIR for functional group analysis while SEM-EDX characterization was performed to determine surface morphology and percentage of elements. SPE parameters were optimized for adsorption-desorption efficiency under various conditions, i.e. of pH 5, Cu(II) concentration of 4 mg/L, the flow rate of Cu(II), and Na2EDTA eluent at 5 mL/min, the volume of Cu(II) sample and Na2EDTA eluent 25 mL and 1.0 M of Na2EDTA eluent concentration. Applying CAC-based SPE for Cu(II) analysis in water samples at optimum conditions gave 80.9–83.6% recovery. In bottled drinking water samples, a pre-concentration factor of 2.5–5 times was obtained, and the Cu(II) concentration of 0.017–0.020 mg/L was detected.

Glutaraldehyde Crosslinked Alginate-Chitosan Nanoparticles as Paracetamol Adsorbent Nurmala Nurmala; Adhitasari Suratman; Suherman Suherman
Indonesian Journal of Chemistry Vol 23, No 6 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.82431

Paracetamol contained in wastewater can cause adverse effects on animal ecosystems, such as fish living in waters and cause harmful effects on humans. Adsorption techniques are used to remove these pharmaceutical compounds. Alginate-chitosan nanoparticles are non-toxic and effectively used as adsorbents to remove pharmaceutical compounds in wastewater. Research on glutaraldehyde crosslinked alginate-chitosan nanoparticles as paracetamol adsorbent has been carried out. This research used the ionic gelation method. Nanoparticles were characterized using transmission electron microscopy (TEM), scanning electron microscope (SEM-EDX) and Fourier transform infra-red spectrophotometer (FTIR). Furthermore, the nanoparticles were used for paracetamol adsorption. The results showed that the form nanoparticles are coarse solid powder and brownish yellow. The TEM image shows an average nanoparticle size of 8.22 nm. Glutaraldehyde crosslinked alginate-chitosan nanoparticles adsorbed paracetamol with adsorption kinetics followed a pseudo-second-order or Ho-McKay model, the adsorption rate constant of 0.0324 g mg−1 min−1. The isotherm study of paracetamol adsorption by glutaraldehyde cross-linked alginate-chitosan nanoparticles followed the isotherm Dubinin-Radushkevich isotherm model with a free energy value of 707.1068 kJ mol−1, and this value indicates the adsorption process by chemically or chemisorption.

Co-Authors Adhitasari Suratman Ahmad Akhib Ainul Yaqin Baiq Amelia Riyandari Dwi Siswanta Endang Tri Wahyuni Hanif Budi Prayitno Kharirotul Suhaila Kinichi Morita Mudasir Mudasir Mudasir Mudasir Nurmala Nurmala Nurul Hidayat Aprilita Sugeng Triyono Wina Akmarina Wulandari Sutiawan

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