Oxalate Precipitation Research Articles

Nutritional Status’ Impact on the Management of Vesical Calculi: A Systematic Review of a Twenty-Two-Year Database

Introduction: Acidogenic diets cause a drop in urinary pH, and increasing features of metabolic syndrome are associated with increased calcium oxalate precipitation. Nowadays, it is well accepted that dietary variables promote the formation of vesical calculi, contributing to the prevalence of vesical stones. Aim: The aim of this study is to estimate the impact of nutritional status on the management of vesical calculi. Materials and Methods: A literature search was conducted in PubMed, Medline, Web of Science, Cochrane library, as well as additional sources such as Google Scholar and ClinicalTrials. gov, covering the period from 2001 to 2022. The most important electronic databases were checked, and all types of studies, including expressive studies, trials, commentaries, and editorials, were considered due to the nature of the studies. The risk of bias was assessed using the recommended methodology. A two-part tool was used to address five specific domains: selection bias, performance bias, attrition bias, selective reporting, and other biases. Quality diagnostic accuracy studies were evaluated using a quality assessment tool. Results: This study included 12 literature sources, of which five were nutrition-based studies and seven were focused on vesical calculi. Dietary modifications and medical treatments were found to be the most important factors in preventing recurrence. Conclusion: Dietary and medical treatments are of utmost importance in preventing recurrence. As per physician advice for vesical calculi, a proper dietary plan that includes a mineralrich diet is needed. Consumption of ample fluids is essential for the removal of stones.

Separation of Cobalt, Samarium, Iron, and Copper in the Leaching Solution of Scrap Magnets

With the growing awareness of protecting the urban environment and the increasing demand for strategic materials, recycling of SmCo magnets has become imperative. This paper provides a series of methods regarding the available hydrometallurgical technologies for recycling scrap magnets. This study aimed to recover samarium (Sm), cobalt (Co), copper (Cu), and iron (Fe) from acid leachate of SmCo scrap by using precipitation and ion exchange. IRC748 showed a good adsorption capacity for Fe and Cu. Elution tests were conducted using sulfuric acid at the concentration of 2N as eluents. Precipitation was performed first using a selective chemical precipitation method, and the Sm was first precipitated as a sodium samarium sulfate powder. Then, the samarium-deprived solution was placed in the beaker, and the addition of oxalic acid promoted cobalt oxalate precipitation. Furthermore, the leachate, which is rich in Cu and Fe, was mixed with oxalic acid to obtain the copper oxalate precipitation. This study successfully recovered SmCo magnets through ion exchange and precipitants.

Biodegradable Methane Sulfonic Acid-Based Nonaqueous Dissolution, Estimation, and Recovery: Toward Development of a Simplified Scheme for Plutonium-Bearing Fuel Matrices

Designing actinide separation methodologies, which simplify process scheme and minimize radioactive waste generation, form the crux for enhancing the sustainability of the nuclear industry. The present study is a step toward development of a universal and simplified scheme for the bulk assay of plutonium and uranium as a part of chemical quality control of plutonium-bearing fuel matrices. Dissolution, estimation, and recovery form the key steps for the same. Plutonium oxide, plutonium–uranium mixed oxide, and plutonium–uranium mixed carbide were quantitatively dissolved in the biodegradable organic acid, viz., methane sulfonic acid (MSA), by heating under an infrared lamp. Usage of corrosive hydrofluoric acid or refluxing conditions were avoided. Stabilization of a single oxidation state, viz., +(IV) and +(VI) for plutonium and uranium in MSA, respectively, was confirmed by ultraviolet–visible spectrophotometry and electrometry. Electrometric studies also exhibited sharp and well separated reduction peaks for U and Pu in MSA, revealing promising possibility of simultaneous voltammetric determination of U and Pu on commercially available glassy carbon electrode. The redox energetic diffusion coefficient (D0) and heterogenous electron transfer kinetic parameters (αn and k0) of this novel system, viz., U and Pu in MSA, were obtained using cyclic voltammetry. Single stage recovery by oxalate precipitation yielding Pu removal of >98% was also demonstrated. The findings reported herein reveal the scope for prospective applications in the front end as well as back end of the nuclear fuel cycle.

A novel method: Nickel and cobalt extraction from citric acid leaching solution of nickel laterite ores using oxalate precipitation

In this study, an alternative method for recovering nickel and other valuable metals from nickel laterite ores is proposed and evaluated. The proposed method comprises a leaching step using citric acid to dissolve the nickel and cobalt from Indonesian nickel laterite ores, and subsequently, an oxalate precipitation step to precipitate the nickel (and cobalt) from citric acid leach filtrate. The results of the leaching experiments showed that nickel (and cobalt) can be dissolved in the leaching step using 1 M citric acid solution at 80 °C, a pulp density of 100 g/L, and leaching duration of 5 h. The results of the oxalate precipitation experiments showed that complete precipitation of nickel can be achieved at 80 °C, 500 rpm stirring speed, and precipitation duration of 3 h. This proposed method can produce Mixed Oxalate Precipitate (MOP) with a purity of 78 %.

An Efficient and Precipitant-Free Approach to Selectively Recover Lithium Cobalt Oxide Made for Cathode Materials Using a Microwave-Assisted Deep Eutectic Solvent

The recovery of cathode materials using deep eutectic solvents (DESs) still requires a long leaching time and relatively high temperatures. The poor selectivity of the leaching process leads to the low purity of the precipitate. Herein, a microwave-assisted choline chlorine–oxalate–water system was designed to selectively leach Li and recover high-purity cobalt oxalate simultaneously, which could greatly shorten the extraction time and decrease the leaching temperature. Fourier transform infrared spectroscopy, X-ray diffraction, inductively coupled plasma–mass spectrometry, and X-ray photoelectron spectroscopy methods were used to explore the mechanism of microwave-assisted DES leaching of valuable metals from lithium cobalt oxide (LCO). It was found that 99.05% of Li could be selectively leached and 99.21% of Co could be precipitated as cobalt oxalate at 100 °C in 10 min simultaneously. The purity of cobalt oxalate precipitated was 95.36% without any purification procedures. A new polymer compound Co2+[(Ch+)x(Cl–)y(HC2O4–)z] was formed during the microwave-assisted leaching process. The compound could be hydrolyzed, and the cobalt oxalate precipitate appeared by increasing the water content in the DES. Finally, the DES for the recovery of LCO could be cycled four times with favorable selectivity. A low-pollution, efficient, process-simple, and precipitant-free technology using a microwave-assisted DES for selective recovery of LCO was proposed, which provided an important reference method for large-scale recovery of valuable metals from spent lithium-ion batteries.

Development of Online pH Monitoring for Lactic, Malonic, Citric, and Oxalic Acids Based on Raman Spectroscopy Using Hierarchical Chemometric Modeling.

Online spectroscopic measurements can be used to provide unique insight into complex chemical systems, enabling new understanding and optimization of chemical processes. A key example of this is discussed here with the monitoring of pH of various acid systems in real-time. In this work the acids used in multiple chemical separations processes, such as TALSPEAK (Trivalent Actinide-Lanthanide Separation by Phosphorus reagent Extraction from Aqueous Komplexes) and oxalate precipitation, were characterized. Raman spectroscopy, a robust optical approach that can be integrated in corrosive processes, was used to follow the unique fingerprints of the various protonated and deprotonated acid species. This data was analyzed using a hierarchical modeling approach to build a consolidated model scheme using optical fingerprints from all weak acids to measure pH associated with any of the weak acid systems studied here. Validation of system performance included utilizing Raman spectroscopy under dynamic flow conditions to monitor solution pH under changing process conditions in-line. Overall, the Raman based approach provided accurate analysis of weak acid solution pH.

Recovery of light rare earth elements, cerium, lanthanum, and neodymium from alluvial gold mining waste from the Bagre-Nechí mining district in Colombia using acid leaching, oxalate precipitation and calcination

This paper investigates different leaching conditions with hydrochloric acid and sulfuric acid, which perform the maximum extraction of cerium, lanthanum, and neodymium from a dephosphorized monazite concentrate obtained from alluvial gold mining waste from the Bagre-Nechí mining district in Colombia, for the subsequent recovery of oxides of these metals. Sulfuric acid as the leaching medium at all evaluated concentration, time, and temperature conditions gave highest extractions. The addition of 10% (v/v) H2O2 increased rare earth dissolution up to 93% in H2SO4 medium. Thermodynamic analysis indicates that H2SO4 solutions show a higher capacity to solubilize REEs as opposed to HCl solutions, thus supporting the experimental results. Rare earths in sulfuric acid liquor can be recovered up to ∼100% by precipitation with a 1.0 M oxalic acid solution at 25 °C for 120 min, followed by the calcination of the oxalate precipitate at 850 °C for 120 min. The final product was characterized by XRD, which indicated a composition of CeO2, La2O3, and Nd2O3. The results of the XRD analysis show the REE phase transformation throughout the process.

Investigation of different efficient precipitation agents for the synthesis of superior oxide-ion conductor Ce0.8Sm0.2O1.9 ceramic electrolytes for intermediate temperature-solid oxide fuel cells

In this study, the superior oxide ion conductor 20% Sm-doped CeO 2 (SDC20) structure was synthesized by using four different efficient precipitation methods to be used as electrolyte in solid oxide fuel cells: hydroxide, oxalate, and solvothermal and hexamethylenetetramine precipitation. In order to avoid unnecessary crystallite growth, the precipitated precursors were calcined at different temperatures specific to the method used. The powders were pelleted by uniaxial and cold isostatic press and then the pellets were sintered at 1200 and 1400 ºC. Powder characterization were made by Thermogravimetric Analysis, Energy Dispersive X-Ray Analysis, X-Ray Diffraction and Scanning Electron Microscopy. The O 2- ion conductivity of the pellets were determined by Electrochemical Impedance Spectroscopy in a static air environment. The O 2- ion conductivity of the pellets were also compared with a commercial product. Solvothermal precipitated SDC20 stood out as the best method of the study by showing O 2- ion conduction 65% superior to the commercial SDC20 sample with a conductivity of 9.2×10 -2 Scm -1 at 800 ºC.

Precipitation of Ferrous Oxalate from Ferrous Ammonium Sulfate in Oxalic Acid Solution

A kinetic study was conducted experimentally for the precipitation of ferrous oxalate. The ferrous oxalate, in the form of dihydrate (FeC2O4·2H2O), was produced by the acidic dissolution of ferrous ammonium sulfate (Fe(NH4)2(SO4)2) in an aqueous solution of oxalic acid, and then precipitated by nucleation and particle growth from supersaturated solution. The effect of the concentration of ferrous ammonium sulfate and oxalic acid as raw materials was investigated on the kinetics of the ferrous oxalate precipitation. Temperature was kept constant at 25 °C. The surface morphology, atomic compositions, and crystal phase were characterized for the ferrous oxalate precipitate collected. As the initial concentration of ferrous ammonium sulfate increased, the initial precipitation of ferrous oxalate occurred faster. The concentration of oxalic acid did not significantly affect the rate of precipitation of ferrous oxalate. The experimental behavior of ferrous oxalate precipitation was modeled with first-order models of reaction kinetics.

Comparison of the Preparation Process of Rare Earth Oxides from the Water Leaching Solution of Waste Nd-Fe-B Magnets’ Sulfate Roasting Products

The new process developed here consisting of sulfurization roasting transformation and water immersion can effectively realize the separation of rare earth elements (REEs) and impurities from spent Nd-Fe-B magnets. For the industrial application of the new process, it is critical to determine how to economically and efficiently prepare rare earth oxide (RExOy) products with higher purity from the obtained water leaching solution. Therefore, according to rare earth sulfate (RE2(SO4)3) solution characteristics, the oxalic acid precipitation–calcination method, sodium carbonate precipitation–calcination method, and double sulfates precipitation–alkali conversion–calcination method were optimized and compared. The results show that the recovery efficiency of REE recovery via the oxalic acid precipitation–calcination method is 99.44%, and the purity of RExOy is 99.83% under optimal technological conditions. However, the cost of oxalic acid precipitation is higher. The process consisting of the double sulfates precipitation–alkali conversion–calcination method is relatively complicated, the recovery efficiency of REEs is 97.95%, and the purity of the RExOy is 98.04%. The recovery efficiency of the REEs and the purity of the RExOy obtained from the sodium carbonate precipitation–calcination method are 99.12% and 98.33%, respectively. Moreover, the recycling cost of sodium carbonate precipitation is the lowest among the three processes for preparing RExOy, so it has industrial application potential. The obtained results for REE recovery from spent Nd-Fe-B magnets in this research can provide theoretical guidance for the innovation of the recycling process for REEs as secondary resources.

Nanoribbon-like NiCo2O4/reduced graphene oxide nanocomposite for high-performance hybrid supercapacitor

Nanoribbon-like NiCo2O4/reduced graphene oxide (RGO) nanocomposites were in situ prepared by an oxalate-assisted hydrothermal method. The various RGO contents (10, 20, and 30 wt%) were added during oxalate precipitation. The plate-like shape of oxalate precipitates was thermally decomposed into the nanoribbon-like morphology in which the NiCo2O4 nanoparticles were aligned in one direction. A network of pores between nanoparticles (∼21–14 nm) is caused by exhausting a large volume of gases during calcination at 450 °C. The specific capacity increases from 418 to 758 C g−1 at 1 A g−1 with the amounts of RGO up to 30 wt%. Furthermore, the NiCo2O4/RGO nanocomposites exhibit higher rate capability than the pristine NiCo2O4 nanoparticles. The NiCo2O4-30 wt% RGO//active carbon hybrid capacitor has a high energy density of 61 Wh kg−1 at the current density of 1 A g−1 and excellent cycling stability of 92% at 3 A g−1 after 5000 cycles.

HOW LOW CAN YOU GO: RECOVERY AFTER A SERUM PH OF 6.62 DUE TO ETHYLENE GLYCOL POISONING

HOW LOW CAN YOU GO: RECOVERY AFTER A SERUM PH OF 6.62 DUE TO ETHYLENE GLYCOL POISONING

Comparative Study of Manufacturing NdFeB Magnet Wastes Recycling: Oxidative Roasting-Selective Leaching and Whole Leaching Routes

This research investigated recycling of manufacturing NdFeB magnet wastes in as-sintered and powder forms which contained high carbon via pyro-hydro metallurgy process. Effects of oxidative roasting on selective leaching of the magnet wastes were the main focus in comparison to recycling via whole leaching without oxidative roasting. The process started from oxidative roasting at 600 °C, sulfuric leaching, drying, roasting at 750 °C for powder and 800 °C for sintered wastes, water leaching, oxalic acid precipitation and calcination at 1000 °C to obtain neodymium oxides. Oxidative roasting was found to reduce carbon and resulted in neodymium and iron oxide formation with a minimum amount of neodymium iron oxide. This provided effective selective leaching of neodymium. For whole leaching, a significant loss of neodymium into leached residue was observed. Oxidative roasting-selective leaching provided significant recovery in the amount of 75.46% while whole leaching resulted in only 31.62 wt.% in the case of sintered waste. The final composition via oxidative roasting-selective leaching consisted of 68.11 wt.% neodymium, 19.83 wt.% praseodymium and 0.31 wt.% iron, while whole leaching resulted in a higher amount of iron at 1.20 wt.%. Similar results were obtained for powder magnet waste.

IN VITRO STUDY ON NIGELLA SATIVA AS INHIBITOR OF CALCIUM OXALATE CRYSTALLIZATION

Objective: This study aims to test the efficacy of Nigella Sativa plant as an inhibitor of calcium oxalate crystallization. Material & Methods: Nigella Sativa alcohol extract was made by maceration of 100 grams Nigella seeds which were dried and powdered for 72 hours and then filtered, so as to produce 100 percent Nigella alcohol extract. Then make dilutions of 10 and 50 percent. The precipitation of calcium oxalate at 37 0C and pH 5.7 was studied by measurement of turbidity at 620 nm with and without inhibitor which is Nigella Sativa. Results: Tmax, the slope of nucleation (SN) and slope of aggregation (SA) was measured with control and with inhibitor. With increasing concentration of inhibitor, Tmax progressively increased, whereas SN and SA decreased. The nucleation percentage inhibition ratio was 86.0% and inhibition of crystal aggregation took place by 66.6% with 100% extract. Crystallization was inhibited (growth and aggregation) in a concentration dependent manner. Conclusion: Nigella Sativa is strong inhibitor of calcium oxalate crystallization. However, comprehensive work is needed to establish the results.

Molecular Identification of Zantedeschia Culture with Determination of Its Morphometric and Metabolic Activities for Mediterranean Acclimatization.

Calla lily (Zantedeschia albomaculata (Hook.) Baill.) is an herbaceous or semi-evergreen perennial grown from rhizomes. It is commonly named “Spotted Arum”. Ribosomal RNAs (rRNAs) are found in all known organisms and are known for being functionally equivalent in all of them. A completely new in vitro culture protocol was applied to Z. albomaculata with two hormones, 6-Benzylaminopurine (BAP) and kinetin, to obtain full growth and multiplication. Due to their highly conserved sequences, the analysis of small-subunit rRNAs (16S–18S rRNAs) can provide precise statistical evaluation of a wide variety of phylogenetic connections. As a result, the plant’s 18S rRNA gene allowed for identification and partial sequencing. Also, the traditional floral method and the novel application technique for identification were applied to Z. albomaculata. In this paper we systemically describe the structural strategies of the plant’s adaptation to the surroundings at the morphological, physiological, and anatomical scale. Most the essential oils and fatty acids found in Z. albomaculata are omega fatty acids, octadecenoic acid, linoleic acid, and palmitic acid. All these fatty acids have industrial, medicinal, and pharmaceutical applications. The significant findings are the spadix sheathing leaves, and the precipitation of raphides calcium oxalate. The mitotic index showing the division activity was recorded, and it was 17.4%. The antimicrobial activity of Z. albomaculata ethanol extract was performed via the well diffusion method. This extract has shown high activity against Escherichia coli and Pseudomonas aeruginosa, compared to its lower activity against Bacillus cereus. By defining these characteristics and in vitro culture conditions, we will be able to acclimatize the plant in greenhouses, and then transfer it to the open field. The findings of this work identified the general characteristics of Zantedeschia albomaculata as an ornamental and medicinal plant in order to acclimatize this plant for cultivation in the Mediterranean climate.

Production of nickel-rich LiNi0.89Co0.08Al0.03O2 cathode material for high capacity NCA/graphite secondary battery fabrication

Abstract Li-ion secondary battery is highly recommended as a power source to highly advanced battery electric vehicles. Among various types, the lithium nickel cobalt aluminum oxide (NCA) battery is considered suitable for high energy and power application. In this study, the NCA cathode material LiNi0.89Co0.08Al0.03O2 was produced via the oxalate co-precipitation technique to reduce the overall production cost and process complexity. Oxalic acid and a small amount of sodium hydroxide were used as the precipitant and pH regulator, respectively. Homogenous and loose metal oxalate precipitate formation was confirmed by X-ray diffraction (XRD), scanning electron microscopy, and Fourier-transform infrared spectroscopy analysis. XRD patterns of the as-obtained micron-sized NCA showed a well-layered hexagonal structure. The electrochemical properties of the cathode in the full cell were thoroughly examined. The specific discharge capacity of the as-obtained NCA in NCA/LiPF6/graphite at a current rate of 20 mA/g was 142 mAh/g. The as-prepared NCA sample had capacity retention of 80% after being charged and discharged at 0.1 A/g for 101 cycles. Scaling up of NCA production process to 2 kg per batch was conducted and evaluation of NCA product quality was performed by material characterization. Based on the overall results and considering the overall process, such an approach is expected to be developed and improved for future large-scale production purposes.

An efficient process for recovering copper as CuO nanoparticles from acidic waste etchant via chemical precipitation and thermal decomposition: Turning waste into value-added product

A succinct process for recovering Cu from acidic waste etchant (AWE) was developed in this work, which included recycling Cu via oxalate precipitation, preparing CuO nanoparticles by thermal decomposing the precipitate, and recovering NaCl via evaporation crystallization. A comparison of copper precipitation by H2C2O4 and Na2C2O4 suggested that an efficient recovery efficiency of Cu was obtained by Na2C2O4 (∼99%), which was higher than that by H2C2O4 (80.31%). Through thermodynamic analysis, a H+-release mechanism was proposed to explain the significant difference in copper precipitation between Na2C2O4 and H2C2O4. By parameter optimization, 99.8% of Cu was recovered without adjusting pH value under optimal conditions, such as temperature of 40 °C, sodium oxalate of 1.2 mol/mol, and reaction time of 2 h. Furthermore, CuO nanoparticles with a purity of 99.92% and particle size of 30 nm were prepared, and the phase transformation of Cu was investigated in-depth using X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrum (FT-IR). Finally, the chloride ions were recovered as NaCl at 99.51% purity. This study provides a potential route to deal with strongly acidic waste etchant and achieve its high-value utilization.

An environmentally friendly hydrometallurgy process for the recovery and reuse of metals from spent lithium-ion batteries, using organic acid

Abstract The increasing use of lithium-ion batteries (LIBs) presents a serious environmental problem. These spent LIBs are suitable sources of metals for the production of LIB cathode active material. This study successfully recovered nickel, cobalt, and aluminum from spent LIB nickel cobalt aluminum oxide (NCA) and regenerated NCA cathode. The effect of the spent anode as a reducing agent was also investigated. The spent anode alone did not reduce the metals Ni and Co sufficiently. The leaching efficiency was only 34.8, 47.15, and 86.75% for Ni, Co, and Al, respectively, and these values did not increase with increasing citric acid concentration or the addition of ascorbic acid as a reducing agent. However, it increased significantly to 85, 90.12, and 100%, for Ni, Co, and Al, respectively, with the addition of 2% v/v H2O2. The ternary metal oxalate (TMO) precipitation of the leaching solution confirmed the synthesis of TMO from the precursor. The regenerated NCA synthesized from TMO had better electrochemical performances than those of new commercial NCA. It had a specific discharge capacity of 137 mA h/g and a retention capacity of 85.4% at 2 C after 50 cycles, whereas the new commercial had a specific discharge capacity of 133.4 mA h/g and a retention capacity of 82.6% at 1 C after 50 cycles.

Identification of Human Alanine-Glyoxylate Aminotransferase Ligands as Pharmacological Chaperones for Variants Associated with Primary Hyperoxaluria Type 1.

Primary hyperoxaluria type I (PH1) is a rare kidney disease due to the deficit of alanine:glyoxylate aminotransferase (AGT), a pyridoxal-5′-phosphate-dependent enzyme responsible for liver glyoxylate detoxification, which in turn prevents oxalate formation and precipitation as kidney stones. Many PH1-associated missense mutations cause AGT misfolding. Therefore, the use of pharmacological chaperones (PCs), small molecules that promote correct folding, represents a useful therapeutic option. To identify ligands acting as PCs for AGT, we first performed a small screening of commercially available compounds. We tested each molecule by a dual approach aimed at defining the inhibition potency on purified proteins and the chaperone activity in cells expressing a misfolded variant associated with PH1. We then performed a chemical optimization campaign and tested the resulting synthetic molecules using the same approach. Overall, the results allowed us to identify a promising hit compound for AGT and draw conclusions about the requirements for optimal PC activity.

Synthesis of Nickel Cobalt Manganese Ternary Transition Metal Oxide from Mixed Hydroxide Precipitate as a Precursor to NCM811

Sustainable green new and renewable energy is continuously developed along with the development of cheap and commercially available secondary energy storage such as Li-ion batteries (LIBs). Nickel-rich cathode material obtained from cheap raw materials can significantly reduce the overall LIBs production cost and improve the overall process feasibility. For the first time, Ni-rich cathode material precursor was synthesized from mixed hydroxide precipitate (MHP). Based on MHP characterization test, the nickel content is high but have slight Mn and Mg level. NCM precursors was prepared in three facile steps, i.e., acid leaching using cheap and environmentally friendly organic acids, coprecipitation using oxalic acid, and thermal decomposition of as-prepared oxalate precipitate. Based on FTIR and XRD analysis, high crystalline oxalate dihydrate precipitates were successfully obtained. The morphological feature of the precipitate is significantly affected by the type of leaching solution. Fine metal oxides precursor powders also were successfully prepared which is confirmed by XRD, FTIR, and SEM analysis and can be readily used for Ni-rich cathode material preparation. In this study, NCM-Ox-LA have the best characteristic properties.