Ahmad Tawfiequrrahman Yuliansyah

The last few decades world has attempted to convert energy sources from non-renewable energy sources to renewable energy, nevertheless, the growth rate of world The last few decades world has attempted to convert energy sources from non-renewable energy sources to renewable energy, nevertheless, the growth rate of world

Utilization of nanoparticles in oil and gas sector has gained a significant interest. Silica nanoparticles is often considered as a promising chemical to improv

Coal-mining activities have well-documented adverse effects on both the environment and human health. Acid mine drainage, a pivotal concern, necessitates effective interventions. This study introduces a novel solution: a modified constructed wetlands crafted exclusively from waste materials, ensuring cost-effectiveness. The innovation yielded exceptional results, achieving a noteworthy reduction of up to 99% in heavy metal concentrations, alongside swift pH normalization. What sets this study apart is its potential beyond the laboratory setting; the utilization of waste materials and low-cost methodologies underscores its scalability and practicality. This solution addresses immediate challenges and showcases promise for real-world implementation. Moreover, the results of the study extend to its insights, which offer a comprehensive examination of the method’s reusability prospects, illuminating its sustained impacts; the recommendations for future action enhance its practical significance. This study marks a significant advancement in tackling acid mine drainage. The modified constructed wetlands, driven by cost-effective waste materials, embody scalable and sustainable potential. With its holistic outlook and strategic roadmap, this study holds the key to transforming acid mine drainage challenges, particularly in rural and developing regions.

Methylene blue is one of the dyes often used in the textile industry. This dye is toxic which causes environmental pollution and health problems for humans and animals. In this research, adsorption of methylene blue dye was carried out by using an adsorbent in the form of red fruit waste biochar in concentration variations (50, 100, and 150 ppm) and contact times (0, 20, 40, 60, 80, 100 and 120 minutes). The kinetics review modeling was based on the pseudo first order and pseudo second order to determine the adsorption capacity of methylene blue with red fruit waste biochar. The adsorption equation was evaluated using the Langmuir adsorption isotherm and the Freundlich adsorption isotherm. The results showed that the most suitable adsorption equilibrium model followed the Langmuir adsorption isotherm with an equilibrium constant (K) is 0.0510 and the maximum adsorption capacity (Qm) is 0.0048 mg/g. The kinetics model of the methylene blue adsorption reaction based on the pseudo second order with the value of k is 0.6973 min^-1 and a relation coefficient value of R² = 1.

The development of textile industry in Indonesia has been increasing rapidly. The vast and continuous development of the textile industry results in an evitable increase of wastewater. One of the wastewater ingredients that difficult to be treated is dye. Dye is a pollutant with complex aromatic structure that is difficult to degrade. There are many dyes could be used, however, methylene blue is mostly used. To treat MB, several treatment methods are available. Among the methods, adsorption has been widely applied, due to its simplicity and effectiveness. In this research, nano crystal cellulose (NCC), which has a large surface area dan better mechanical properties, was prepared from the oil palm trunk and it was proposed to adsorb the methylene blue. Briefly, the process of making NCC as a biosorbent consists of the raw material pretreatment, alkaline treatment, bleaching, hydrolysis, and sonication steps. Alkaline treatment plays an important role for extracting hemicellulose, lignin and other extractive substances, so that NCC is expected to have high cellulose purity. The alkaline treatment was conducted by extraction methode using NaOH at 80 °C for 2 hours. The result showed that the percent of removal of hemicellulose dan lignin were 50.0, 55.6, and 51.73 % for NaOH concentration of 3, 4, and 5 % (w/v) respectively. This result was also supported by the result of FTIR spectra analysis on each corresponding sample. Based on these data, it can be confirmed that the optimum NaOH concentration for alkaline treatment of oil palm trunk is 4 % (w/v). Furthermore, adsorption test of NCC using methylene blue solution gave percent removal of methylene blue in the range of 69.46-72.51%.

Biomass is a promising alternative energy resource due to its sustainability and environmental friendliness. In addition, it is also a potential candidate for chemical feedstock since many chemicals can be extracted or synthesized from biomass. Oil palm empty fruit bunch (EFB) is a biomass waste coming from the oil extraction process in a palm oil mill. In this study, potential recovery of chemicals from such biomass waste will be explored by hydrothermal treatment. Slurry of 300 mL of water and 30 g of material was treated in a 500 mL batch autoclave in temperature range of 200-350°C and initial pressure of 2.0 MPa. The slurry was heated up gradually to designed temperature, and then was kept for 30 min residence time. After filtrated, the liquid product was obtained. The liquid products were analyzed by TOC meter and HPLC. The analysis result showed that the liquid product contained several valuable chemicals from the decomposition of sugar compounds such as glucose, xylose, furfural, 5-hydroxymethylfurfural (5-HMF), formic acid and acetic acid. Yield of each compound varies at different temperatures. At elevated temperature, yield of sugar- derivative compounds tends to decrease.