Separation Characteristic and Selectivity of Lithium from Geothermal Brine Using Forward Osmosis

The need for lithium as a raw material for battery production in electric vehicles has triggered the growth of the lithium indus- try throughout the world, resulting in massive competition for the exploitation of lithium. Responding to these challenges, lithium recovery technology continues to be developed, one of which is membrane technology. This research focuses on the use of forward osmosis (FO) technology. The search for the best operating condition parameters for the process highlights a major concern. The condition parameters include temperature, draw solution concentration, and flow rate. The temperature varied from 30, 33, 36, 39 to 42 °C, the draw solution concentration varied from 1, 2 to 5 M, while the flow rate varied by 2, 3 and 4 L h −1 . The best conditions were obtained at a temperature of 42 °C, a concentration of 5 M draw solution, a flow rate of 4 L h−1 with a flux of 68.47 L m−2 h −1 , a normalized concentration ratio of 3.31, and an average solute rejection of 79.25%. Meanwhile, the most suitable osmotic pressure model to explain the phenomenon in the FO process is the Extended Pitzer

Improved oily waste water rejection and flux of hydrophobic PVDF membrane after polydopamine-polyethyleneimine co-deposition and modification

The surface structure and properties of a membrane largely determine its in-service performance during a filtration process. Polyvinylidene fluoride (PVDF) hydrophobic membrane is widely used in the separation of oily waste water because of its mechanical strength, but is susceptible to oil fouling, whereas hydrophilic membranes are easily damaged in water due to their wettability but are resistant to oil. The advantages of the two membranes are then combined by modifying the hydrophobic membrane to be hydrophilic to maintain stability, mechanical strength, and antifouling performance. PVDF ultrafiltration membranes were modified with a mixture of different concentrations of polydopamine (PDA) and polyethyleneimine (PEI) using different deposition times (6, 12, and 24 h) and characterized using SEM, FTIR, and contact angle. Membrane performance was tested using a dead-end module for 60 minutes. The PDA-modified membrane showed a decrease in hydrophilicity from 88.1° to 77.7° after being coated with 0.5 g/L PDA for 6 hours, while with the addition of 2 g/L PEI, the hydrophilicity reached 64.6°. SEM characterization showed the presence of aggregates formed during the PDA polymerization process and decreased with the addition of PEI. This is in line with the results obtained from the performance test with the dead-end module where the smaller the aggregate, the greater the flux produced. FTIR characterization showed a strong bond between PDA and PDA-PEI with the membrane as the concentration and coating time increased

Optimization of Lithium Separation from NCA Leachate Solution: Investigating the Impact of Feed Concentration, Pressure, and Complexing Agent Concentration

Recycling lithium batteries (LIB) has emerged as an attractive solution in the global pursuit of environmentally friendly practices. The aim of achieving zero–waste hydrometallurgical technology is within reach. This research focuses on utilizing the low-pressure nanofiltration process to address this challenge by separating lithium ions from other ions and achieving a desirable permeate flux. The NCA battery leachate concentrate was obtained through a hydrometallurgical process involving sulfuric acid–peroxide. To ensure the prevention of potential nanofiltration membrane (TS80) fouling, the concentrate is initially filtered using an ultrafiltration membrane (UH004) to remove any particles. The research investigates the impact of pressure (4, 6, and 7 bar), solution concentration (concentrate, 10x, and 50x dilution), and the concentration of the complexing agent (EDTA) on the desired separation performance. The investigation reveals that pressure variations exhibit consistent rejection rates, remaining stable above 80%. A similar trend is observed with the addition of EDTA, which consistently yields rejection rates above 80%. However, when examining different feed concentrations, the rejection of lithium falls below 80% for leachate concentrates. In summary, satisfactory results are obtained by employing nanofiltration with a TS80 membrane at a pressure of 7 bar, a dilution factor of 10x, and using a 0.02M EDTA complexing agent. Meanwhile, it was found that the separation factors (Li⁺/Ni²⁺ = ~8.6, Li⁺/ Co²⁺ = ~7.3, Li⁺/Al³⁺ = ~4.9) and permeate flux ±46.58 L m⁻² h⁻¹. The findings demonstrate good selectivity along with relatively high flux

Fabrication of Cellulose Nanocrystal (CNCs) based biosorbent from oil palm trunks through acid hydrolysis with sonication assisted and adsorption kinetic study

Developing cellulose nanocrystal (CNCs) preparation techniques is a challenge confronted by many researchers. The advantages of property remain the reason for research to be developed. To deal with this issue, it is essential to conduct research related to process optimization, particularly in the hydrolysis process, which is the primary step in forming CNCs. In this study, the effect of sonication- assisted hydrolysis time was investigated. XRD characterization showed that the CNCs formed where the first group with specific peaks indicated. The crystallinity of CNCs decreased with increasing sonication duration, indicating that sonication-assisted hydrolysis was nonselective. The crystallinity of CNCs obtained for 15, 30, and 45 min was 61.6, 55.0, and 48.4 %, respectively. For sonication duration variations of 15, 30, and 45 min, the hydration diameter of CNCs was nearly identical at 42.35 ± 27.10, 42.99 ± 29.46, and 42.63 ± 29.49 nm, respectively. Similarly, the removal of methylene blue can be achieved using CNCs bio-adsorbent. The results of percent removal of methylene blue under sonication treatment of 15, 30, and 45 min of sonication were 73.34; 73.62; 72.86 %, respectively. The adsorption rate of CNCs follows the pseudo-second-order kinetic model, with the adsorption values under sonication treatment of 15, 30, and 45 min were 0.075 ± 0.008; 0.166 ± 0.013; 0.078 ± 0.005 g mg-1 min-1, respectively

Pengaruh Variasi Waktu dan Kecepatan Pengadukan Terhadap Difusivitas dan Konstanta Reaksi Dengan Proses Ekstraksi Reaktif

The world is experiencing a crisis of scarcity of diesel fuel sources. The B30 program is to develop energy sources by utilizing alternative energy sources to prevent petroleum shortages. This program also supports research, namely making biodiesel using non-edible raw materials. Apart from that, another benefit of this research is to determine the effect of time on the yield of biodiesel production, knowing the effect of stirring speed on the diffusivity constant and reaction speed constant of the reactive extraction process. Biodiesel production in this research uses a reactive extraction process. The raw materials used are mahogany seeds, the solvent is methanol, chloroform as a co-solvent, and KOH as a catalyst. This process uses a temperature of 65°C, reaction time of 40 and 80 minutes, and varying stirring speeds of 200 and 300 rpm. The effect of time with a variable stirring speed of 200 rpm the longer the resulting yield increases, while at a stirring speed of 300 rpm the resulting yield decreases. The yield obtained at 200 rpm stirring was 82.363% (40 minutes), 87.6366% (80 minutes), 84.7605% (40 minutes), and 78.7204 (80 minutes). For the methyl ester diffusion constant, the stirring speed of 200 rpm is 8,20 x 10-8 dm2/minute, while the stirring speed of 300 rpm is 8,17 x 10-8 dm2/minute. The reaction rate constant is 1.99 dm3/mol min

Membrane and membrane-integrated processes for nanoplastics removal and remediation

The impact of nanoplastics on the environment and human health is a growing concern. Due to their small size and chemical properties, nanoplastics pose a higher risk than microplastics. Membrane filtration processes have been identified as effective for nanoplastic removal, but integration with other remediation techniques is necessary, except for membrane bioreactors. Membrane bioreactors show promise in handling nanoplastics due to their bioprocessing capability. This review critically evaluates current research on membrane processes and their integration for nanoplastic removal. It discusses the principles and challenges associated with these technologies. The study provides new strategies to expand the industrial-scale application of membrane processes for the treatment of nanoplastics. This review highlights the importance of addressing nanoplastic pollution and presents avenues for future research and implementation