Al Ions Research Articles

Comparison of electronic stopping cross sections for channeled implantation of Al ions between the 〈0001〉 and 〈11 2¯ 3〉 directions in 4H-SiC

Electronic stopping cross sections (S e) for channeled implantation of Al ions in 4H-SiC were compared between the 〈0001〉 and 〈11 2¯ 3〉 directions. We first modeled S e for random implantation (S e random) by combining the Firsov equation at an Al-ion energy E < 8.6 MeV with the constant (i.e. 4.22 × 10−13 eV cm2/atom) at E > 8.6 MeV. We then assumed S e for channeled implantation being k S e random and fitted k to the reported maximum channeled ranges of 18−20 MeV Al in 4H-SiC. The resultant k 〈112̄3〉 of 0.53 being smaller than k 〈0001〉 of 0.70 was consistent with the difference in the maximum impact parameters.

Porosity generation via spatially uncoupled dissolution precipitation during plagioclase replacement in quartz undersaturated fluids

The replacement of feldspars is commonly characterized by pseudomorphism and reaction-induced pore generation. However, the effects of compositions of feldspars and fluids on porosity generation during alteration are still poorly understood. In this study, we conducted a series of hydrothermal experiments on plagioclase replacement by 2 M KCl or NaCl aqueous solutions at 600 °C and 150 MPa for 1–8 days, using plagioclase with different compositions (anorthite, An96Ab4; labradorite, An66Ab33Or1; albite, An1Ab99) with or without quartz. Albite replacement by K-feldspar was not affected by the presence of quartz, whereas anorthite was unaltered in the quartz-absent fluid. The replacement of labradorite by KCl(aq) showed different results: in the presence of quartz, labradorite was altered by K-feldspar, whereas in the absence of quartz, alteration proceeded significantly with the generation of large pores hosted by secondary anorthite coupled with euhedral K-feldspar overgrowth. Such textural relationship and oxygen isotope-labeled experiments reveal that silica-deficient fluid enhances the uncoupled dissolution reprecipitation process. The Si and Al ions in the reacted aqueous solution diffused outside the labradorite grains and encountered K+-rich solutions to grow K-feldspar. The experiments with polycrystalline rocks composed of amphibole + labradorite using 2 M KCl aqueous solution indicated the replacement of labradorite grains by anorthite and K-feldspar overgrowth, as found in single-crystal experiments. Our results indicate that the silica concentration in the fluids has different influences on the saturation indices of albite, anorthite, and K-feldspars in saline fluids, which significantly affect the replacement textures and porosity generation in crustal rocks.

ГИГИЕНИЧЕСКАЯ ОЦЕНКА КАЧЕСТВА ВОДЫ ЦЕНТРАЛИЗОВАННОЙ СИСТЕМЫ ПИТЬЕВОГО ВОДОСНАБЖЕНИЯ И ЭФФЕКТИВНОСТИ ИСПОЛЬЗОВАНИЯ БЫТОВОГО ПРОТОЧНОГО ФИЛЬТРА

The results of assessing the quality of tap water of the centralized drinking water supply system in Chelyabinsk for 2022-2023 and the efficiency of using a household flow filter to clean it. The variability of the mineral composition, the periodic non-compliance of water quality with the requirements of SanPiN 1.2.3685-21 in terms of the Fe content and the level of hardness, have been established. The high efficiency of purification of tap water from Fe, Li, Pb, Sn, Cu, Al ions by the water purifier tested for 1,5 years was revealed. Lower productivity in the filter operation is determined to reduce the levels of sulfates, fluorides, polyphosphates, hydrocarbonates and its alkalinity in water, inefficiency – in relation to Cl, Cr, K, Si and water hardness.

A novel isophorone-based fluorescent probe for recognizing Al3+ and its bioimaging in plants.

Aluminium ions (Al3+) are widely present in industries and daily life and are closely related to human health and environmental protection. Therefore, it is crucial to detect their concentration. In this paper, a convenient and reliable small molecule fluorescent probe based on a dicyanoisophorone Schiff base and 2-pyridinecarbohydrazide has been developed. The probe is capable of selectively detecting Al3+ with the advantages of near-infrared emission (maximum emission wavelength of 625 nm), good selectivity, high sensitivity (detection limit of 2.18 × 10-7 M) and fast response time (15 s). It has good potential for rapid detection and visual tracking of Al3+ in aqueous solutions and plant bodies.

Sensitive and specific detection of trace Al3+ ions using an upconversion nanoparticle-xylenol orange complex via the inner filter effect.

We have developed a novel fluorescence sensor based on upconversion nanoparticles (UCNPs) for the rapid and sensitive detection of trace aluminum ions (Al3+). The sensor utilizes the inner filter effect (IFE) between the UCNPs and the xylenol orange-aluminum complex (XO-Al3+), resulting in significant fluorescence quenching at 543 nm upon Al3+ binding. This quenching correlates directly with the Al3+ concentration, allowing for quantitative detection within a range of 0-30 μM and achieving an ultra-low detection limit of 0.19 μM. Selectivity of the sensor is enhanced by the incorporation of ascorbic acid, which masks interfering Fe3+ ions, thus ensuring accurate determination of Al3+ even in the presence of other metal ions. The UCNPs-XO sensor exhibits excellent stability and reproducibility, and minimal interference from commonly co-existing substances. This makes it suitable for the detection of Al3+ in various matrices, including food products and environmental water samples. Our work offers a significant advancement in Al3+ detection, with potential applications in food safety, environmental monitoring, and public health.

Easy hydrogel preparation with high-purity lignin separated from DES pretreatment with excellent performance for moisture-electric generators and motion sensors

This study presents a rapid and straightforward method to prepare a multifunctional hydrogel using deep eutectic solvent-pretreated lignin (DESL), aluminum ions (Al3+), and polyacrylic acid (PAA) in an aqueous system.

Electrosynthesis and Characterizations of Aluminum Silver Selenide (Alagse2), Thin Films for Possible Device Applications

The semiconductor thin films of Aluminum Silver selenide (AlAgSe2) have been successfully deposited onto FTO glass substrate using electrodeposition method. AgNO3, AlCl3.6H2O and Selenium powder were the precursors used for sources of Ag, Al and Se ions respectively. Prototype of the films were again made and subjected to annealing at temperature of 150°C for 5 minutes to remove the element of moisture content in the as deposited films. The properties of the films such as optical, structural and compositional were investigated using UV-VIS Spectrophotometry, X-ray diffractometry and Rutherford Backscattering Spectroscopy (RBS) analysis respectively to determine the possible areas of applications of the films. Optical analysis revealed that the films have high absorbance in the UV region but decreased in the visible and near infrared regions. The increase in the concentration of selenide ions however decrease the absorbance of the films but annealing tends to increases the absorbance. The films also exhibited very high values of refractive index with minimum value in the order of 2.0 for both the annealed and as deposited samples. The bandgap energies of the films were found to be 1.7 eV, 1.8 eV, 2.2 eV, 2.8 eV and 2.9 eV for as deposited, but decreased to the values of 1.5 eV, 1.6 eV, 1.92 eV, 2.15 eV and 2.5 eV after annealing for the films deposited with 0.1 M, 0.2 M, 0.3 M, 0.4 M and 0.5 M Se ions respectively. The structural analysis indicates that AlAgSe2 films are crystalline in nature with most preferential crystalline plane of (112). The RBS compositional analysis showed that the deposited thin films are rich in silver content. These properties exhibited by the deposited thin films of AlAgSe2 are desirable for photovoltaic devices and for many other optical and optoelectronic applications.

Decoding the ICT–PET–ESIPT liaison mechanism in a phthalimide-based trivalent transition metal ion-specific chromo-fluorogenic probe

A phthalimide-based chromo-fluorogenic scaffold, DAID, fusing ICT–PET–ESIPT processes in a single molecular platform is introduced. It shows turn-on and ratiometric chromo-fluorogenic behaviors toward trivalent transition metal ions Al3+, Fe3+, and Cr3+.

Aluminum intercalation behaviours of {[Fe(Tp)(CN)3]2[M(H2O)2]} cyanido-bridged chain compounds in an ionic liquid electrolyte.

As the development of aluminum-ion batteries is still in its infancy, researchers are still dedicated to exploring suitable host materials and investigating their aluminum intercalation behaviours. Here, a series of cyanido-bridged chain compounds with the formula {[FeIII(Tp)(CN)3]2[MII(H2O)2]}n (M = Ni, Co, Mn, Zn, Cu) are studied as cathode electrodes for aluminum-ion batteries with [EMIm]Cl-AlCl3 (1-ethyl-3-methylimidazolium chloride-AlCl3) ionic liquid as the electrolyte. The electrochemical properties suggested Fe3+/Fe2+ to be the redox-active couple during the aluminum intercalation and deintercalation processes of these compounds, and the observed maximum specific capacity obtained by the Fe-Co compound is 200 mA h g-1 despite the rapid specific capacity fading. To gain a deeper understanding of the capacity decay suffered by these compounds, further investigation was conducted to explore the evolution of compounds during the electrochemical measurements. It has been attributed to the following reasons: 1. thermodynamic instability results in the transformation/damage of two of the chain structures (for the Fe-Ni and Fe-Co compounds) during heat treatment on electrodes, a crucial step in electrode preparation; 2. the acidic nature of the electrolyte triggers the destruction of the chain structure, with the appearance of partial reduction of Fe3+ to Fe2+, and a new interaction of the cyano group with aluminum; 3. the high charge density of inserted Al ions makes the chain structure suffer from structural damage during both the charging and discharging processes. The progressive accumulation of trapped intercalated ions hampers their involvement in the reaction, consequently decreasing electrochemical reversibility.

Interaction of Ti-6Al-7Nb alloy with simulated body fluid; a preliminary biocompatibility investigation

The current study aims to investigate the interaction of Ti-6Al-7Nb with simulated body fluid (SBF) in order to apply a preliminary biocompatibility investigation of this novel biomedical alloy, promising for orthopedic applications. Results of the static immersion tests conducted in SBF at body temperature demonstrated that Ca-P rich structures form on the Ti-6Al-7Nb alloy surfaces and the oxide layer formation-dissolution cycle reaches a stable state during immersion. Ion release levels were mostly below critical values except for the initial Al ion release level, which indicated the need for the presence of a stable protective layer on the alloy surface. The second set of static immersion experiments conducted in densified SBF demonstrated that, such a protective layer can rapidly form by biomimetic coating if followed by a preliminary surface treatment. Overall, Ti-6Al-7Nb alloys layers exhibit promising biocompatibility for orthopedic applications, especially with the presence of a stable protective layer.

GEOMORPHOLOGICAL, HYDROGEOLOGICAL AND GROUNDWATER QUALITY ANALYSIS IN KARST SYSTEMS OF THE CENTRAL-WESTERN PART OF METALIFERI MOUNTAINS

This scientific study focuses on the relatively lesser-known karst areas in the central-western part of Metaliferi Mountains. These surfaces display pronounced spatial fragmentation, forming limestone klippes with well-defined karst systems of geomorphic and hydrogeological complexity. Using GIS and statistical methods, the study highlights the morphological and distributional traits of the identified karst forms. Additionally, the area was analysed from a hydrogeological standpoint to explore the connections between the identified insurgences and exsurgences, and the impact of the karst environment on the chemical characteristics of karst waters. The geomorphological analysis reveals a clustered and non-uniform arrangement of depression forms, as shown by the nearest neighbour index, with a quasi-circular shape highlighted by the Circularity Index. From a hydrogeological perspective, there is an increase in carbonate ions (HCO3-) and calcium ions (Ca2+), along with a decrease in Fe and Al ions, indicating possible alluvium presence as a filter. The comparison of these values with legal thresholds demonstrates a high water quality in the analysed karst exurgences.

Aluminum(III) complexes of aroylhydrazones derived from nicotinic acid hydrazide: MS, UV-Vis and DFT study

In the continuation of our study on aroylhydrazones, the binding properties of N'-(2,3-dihydroxy-phenylmethylidene)-3-pyridinecarbohydrazide (H2L1 ), N'-(2,4-dihydroxy-phenylmethylidene)-3-pyridinecarbohydrazide (H2L2 ) and N'-(2,5-dihydroxy-phenylmethylidene)-3-pyridinecarbohydrazide (H2L3 ) towards potential toxic Al(III) ions were investigated in methanol/water 50/50 solution by mass spectrometry, UV-Vis spectrophotometry and DFT calculations. The stability constants (logK) for Al(III)-H2L 1:1 complexes in MeOH/H2O 1/1 at pH 2.52 were determined as 3.39, 2.87 and 2.59, respectively. Detailed characterization of complexes was performed by high-resolution mass spectrometry. The MS spectra reveal the formation of 1:1 complexes with decreasing stability in the order H2L1 > H2L2 > H2L3 . DFT calculations revealed several possible modes of ligand coordination, acting as bidentate or tridentate ligands. The comparison with analogous Ga(III) complexes was made as well.

On the Structure of Oxygen Deficient Amorphous Oxide Films.

Understanding defects in amorphous oxide films and heterostructures is vital to improving performance of microelectronic devices, thin-film transistors, and electrocatalysis. However, to what extent the structure and properties of point defects in amorphous solids are similar to those in the crystalline phase are still debated. The validity of this analogy and the experimental and theoretical evidence of the effects of oxygen deficiency in amorphous oxide films are critically discussed. The authors start with the meaning and significance of defect models, such as "oxygen vacancy" in crystalline oxides, and then introduce experimental and computational methods used to study intrinsic defects in amorphous oxides and discuss their limitations and challenges. To test the validity of existing defect models, ab initio molecular dynamics is used with a non-local density functional to model the structure and electronic properties of oxygen-deficient amorphous alumina. Unlike some previous studies, the formation of deep defect states in the bandgap caused by the oxygen deficiency is found. Apart from atomistic structures analogous to crystal vacancies, the formation of more stable defect states characterized by the bond formation between under-coordinated Al ions is shown. The limitations of such defect models and how they may be overcome in simulations are discussed.

Multiple hydrogen bonds enable high strength and anti-swelling cellulose-based ionic conductive hydrogels for flexible sensors

Although ionic conductive hydrogels (ICHs) have been widely utilized to fabricate excellent flexible sensors, traditional ICHs are generally easy to swell, resulting in the inevitable failure of flexible sensors. Herein, a facile and effective strategy is employed to impart ICHs with excellent mechanical properties, satisfying anti-swelling property, favorable anti-freezing property, and high ion-conductivity simultaneously, that is to construct multiple hydrogen bonds (H-bonds) through directly dissolving cellulose in salt solutions, avoiding the tedious preparation process of traditional ICHs as well. Notably, the cellulose is directly dissolved in the solution containing zinc ions (Zn2+) and aluminum ions (Al3+), and then acrylic acid (AA) and acrylamide (AAm) are copolymerized in it. Multiple H-bonds are formed among the abundant − OH groups, −NH2 groups, and − COOH groups belonging to cellulose, AAm, and AA, respectively. As a result, the improved anti-swelling ability (88.03 %) and compressive performance (24.11 MPa) of the resultant Ion-C-P(AA-co-AAm) hydrogel are achieved. Besides, excellent conductivity (48.39 mS/cm) and frost resistance are provided by generous Zn2+ and Al3+. Moreover, Ion-C-P(AA-co-AAm) hydrogel exhibits favorable sensitivity in monitoring human activities and can output stable electrical signals in a low-temperature environment, showing a great potential application for flexible sensors.

Recent Developments in Colorimetric and Fluorometric Detection Methods of Trivalent Metal Cations (Al3+, Fe3+ and Cr3+) Using Schiff Base Probes: At a Glance.

This review basically concerned with the application of different Schiff bases (SB) based fluorimetric (turn-off and turn-on) and colorimetric chemosensors for the detection of heavy metal cations particularly Al(III), Fe(III), and Cr(III) ions. Chemosensors based on Schiff bases have exhibited outstanding performance in the detection of different metal cations due to their facile and in-expensive synthesis, and their excellent coordination ability with almost all metal cations and stabilize them in different oxidation states. Moreover, Schiff bases have also been used as antifungal, anticancer, analgesic, anti-inflammatory, antibacterial, antiviral, antioxidant, and antimalarial etc. The Schiff base also can be used as an intermediate for the formation of various heterocyclic compounds. In this review, we have focused on the research work performed on the development of chemosensors (colorimetric and fluorometric) for rapid detection of trivalent metal cations particularly Al(III), Fe(III), and Cr(III) ions using Schiff base as a ligand during 2020-2022.

SrTiO3 Based Two Dimensional Nanoplatelets for Low-Cost Solar Hydrogen Generation: Materials Beyond the State-of-the-Art

SrTiO3 is an important multifunctional perovskite, that can possess versatile characteristics such as photocatalytic behaviour, ferroelectricity, high electronic conductivity and others. In the context of solar hydrogen (H2) generation, Domen’s group has investigated SrTiO3 for almost two decades and finally have been able to achieve quantum efficiencies approaching unity [1] and large-scale demonstrations [2]. However, the achieved solar to hydrogen (STH) efficiencies remain well under 1%. One of the key bottlenecks limiting the photocatalytic efficiencies of SrTiO3 is its wide bandgap that limits its visible light absorption capability. Several strategies have been used to reduce the bandgap of SrTiO3 to improve visible light absorption but it can only be improved up to a certain limit. Nevertheless, there are other challenges as well in the form of higher recombination rates and an alternate way to further improve the photocatalytic rates is to employ strategies that can inhibit the recombination of photogenerated charges. Our group has been investigating the effect of Al doping on the morphological as well as chemical properties of SrTiO3 to gain fundamental understanding behind the improvement in photocatalytic rates. Our recent report explains that Al ions in SrTiO3 lattice act as hole trapping sites, which helps in suppressing charge recombination [3].Furthermore, to go beyond the current state-of-the-art, our group has been working on forming 2D SrTiO3 heterostructures. The 2D platelets facilitate efficient charge separation as their low thickness enables fast charge transport to the surface, where they are utilized for redox reactions. 2D area also offers large number of active sites and the possibility to form 2D/2D heterostructure with maximum face contact between two semiconductors. However, SrTiO3 does not have a thermodynamic tendency to grow in 2D morphology. Our group has designed hydrothermal conditions to form 2D SrTiO3-based platelets (Fig. 1) through topochemical transformation reaction at a much lower temperature of 200⁰C [4]. Without any support from noble-metal doping or cocatalysts, the epitaxially grown SrTiO3 heterostructural platelets showed stable and 15 times higher photocatalytic H2 production than the commercial SrTiO3 nanopowders. Our recent study [5] elucidates the role of supersaturation conditions on controlling the morphology of these 2D SrTiO3 nano-platelets and formulates their precise growth mechanism. By optimizing the synthetic procedure, the photocatalytic performance can be tuned to achieve much higher STH efficiencies. The presented synthesis strategy provides guiding principles and ideas for designing other defined 2D semiconductors under hydrothermal conditions, eventually going beyond the current state-of-the-art.

Evolution of Phases at the Surface and Interface of Mn Based Spinel Cathode with Coating Layer - a Spectroscopic Investigation

Surface modifications, commonly termed coatings or artificial interphases, are known to mitigate secondary reactions of charged cathodes with organic electrolyte and limit surface reconstruction. As a result, better electrochemical stability has been observed for coated cathodes in both liquid and solid electrolyte-based Li ion batteries (LIBs). However, these coatings, in contact with electrolyte, can be dynamic and evolve during processing stages or electrochemical cycling.In this work we investigate the interphases between spinel cathodes and two coating layers, LiNbO3 and Al2O3. The spinel LiMn2O4 (LMO) cathode and its doped variant LiMn1.5Ni0.5O4 (LMNO), owing to their three-dimensional structure, have high-rate and high-power capability with moderate energy density. With conventional electrolytes, the surface transition metal undergoes reduction forming thin binary or layered ternary oxides when charged beyond 4.2V (vs Li), restricting Li ion transport, and thereby compromising accessible capacity. This along with dissolution of manganese by HF (generated at the liquid electrolyte-electrode interface) restricts long-term applicability in practical LIBs thus necessitating surface coating or doping. In our experiments we choose epitaxial thin-film cathodes and thin-film coating materials. These provide large interface, and hence interphase areas, of well-defined crystal orientation, facilitating characterisation to deepen our understanding of the surface reactions occurring. We form an epitaxial film of cathode material using pulsed laser deposition (PLD) followed by controlled deposition of Al2O3 via atomic layer deposition (ALD) or LiNbO3 via PLD.We will present the detailed characterisation analysis of coated and uncoated spinel thin films. The epitaxial nature and crystal structure of deposited thin films are confirmed using thin film X-ray diffraction. Structurally, the phase diagram of Li-Mn(Ni)-O is complicated with many possible crystal structures with varying lithium content as well as different oxidation states of manganese. Hence, we employ a combination of X-ray absorption and photoelectron spectroscopies (XAS/XPS) to look at the chemical states of Mn ion in the cathode and Nb and Al ions in LiNbO3 and Al2O3 coating layers. For the as deposited fresh samples, the effect of deposition conditions is evaluated using XAS of the Mn L-edge and Al K-edge. XPS depth profiles of elemental distribution in the thin film heterostructures are obtained at three different incident X-ray energies (up to 6.6 kV) – thus providing chemical information from the surface, coating and at the interface of coating and cathode layers. Subsequently we electrochemically cycled these films in organic electrolyte against Li metal anode and further spectroscopic investigations were carried out. The effect of Al2O3 vs LiNbO3 coatings on retaining the structure of cathode material is probed and we will discuss the understanding thereby developed.

Enhanced Oxygen Reduction Reaction Activity of Manganese Oxide via p−d Hybridization with Aluminum Group Element Dopants

AbstractDoping engineering is an effective strategy to improve the electrocatalytic activity of manganese oxides by enhancing their poor electrical conductivity and oxygen adsorption capacity. Herein, p‐block aluminum group metal ions (Al3+, Ga3+, and In3+) are introduced into cryptomelane‐type manganese oxide octahedral molecular sieves (OMS‐2), leading to p−d orbital hybridization between the p‐orbitals of the aluminum group metals and d‐orbitals of Mn, facilitating the oxygen reduction reaction. The aluminum group metal‐doped OMS‐2 exhibits excellent catalytic activity, rapid reaction kinetics, and favorable stability compared to commercial Pt/C. Among the three prepared catalysts, Ga‐doped OMS‐2 (Ga‐OMS‐2) has stronger oxygen reduction activity. Experimental and theoretical calculations show that the superiority of Ga‐OMS‐2 is attributed to p−d hybridization, which enriches the reaction sites and enhances the binding strength of the catalyst to the O2 reaction intermediates. As a proof of concept, Zinc−air batteries assembled with Ga‐OMS‐2 as a catalyst exhibit superior power density and cycle life to commercial Pt/C. This p−d hybridization strategy gives insight into the p‐block metal doping of catalysts prepared with other transition metals with excellent electrocatalytic activity and durability for energy storage and conversion.

Utilizing ultrapure magnetite concentrate for environmentally friendly and low-cost synthesis of high-performance strontium ferrite

The presence of Al and Si impurities from ultrapure magnetite concentrate (UMC) entering the lattice during the preparation of M-type strontium ferrite (SrM) has been a significant issue limiting the enhancement of magnetic properties in UMC- prepared SrM. In this article, the impact of CaCO3 on the phase formation mechanism of synthesizing SrM using UMC is investigated. It is found that the formation of intermediate SrFeO3−x phase and SrFe12O19 phase shifts to the lower temperatures upon CaCO3 addition. Lower calcination temperatures can inhibit excessive grain growth, thereby improving coercivity. At a calcination temperature of 1050 °C with the addition of 0.6 wt% CaCO3, the highest coercivity of 4672.29 Oe was achieved. Lattice parameters, magnetic properties, and micro-area composition analysis demonstrate that the addition of CaCO3 reacts with Al impurities, preventing the incorporation of Al ions into the SrM lattice and promoting an increase in saturation magnetization. The highest saturation magnetization of 71.45 emu/g was obtained at the calcination temperature of 1200 °C. It has reached the level of magnetic properties of SrM prepared from Fe2O3. CaCO3, being low-cost and environmentally friendly, can serves as an effective additive for improving the magnetic properties of UMC-prepared SrM without compromising its cost-effective and eco-friendly advantages.

Effective biosorption of Al ions from drinking water by lignocellulosic biomass rice straw

High concentration of aluminum (Al) in drinking water is a major intake source of it and can result in serious diseases. Rice straw (RS) as lignocellulosic biomasses has great potential to peak up metal ions from aqueous environment, however, feasibility of Al3+ removal by RS has not been investigated yet. The present study aimed to evaluate the capacity of RS as a novel biosorbent for Al3+ from drinking water. Biosorption characteristics of RS were surveyed through several biological and physiochemical techniques. Additionally, isotherm, kinetic and thermodynamic studies were evaluated using various common models. BET profiles revealed the presence of textural mesoporosity on heterogeneous surface, which leading to improve the biosorption capacity. SEM-EDS analysis confirmed the morphological changes as irregularly particles of Al3+ on external surface via physical mechanism. The results of bioassays and FTIR analysis showed carboxylic and hydroxyl groups in lignin and pectin as the main Al3+ binding site. The batch experimental results showed the maximum biosorption capacity of 283.09 mg/g and removal efficiency of 94.86% for Al3+ at biosorbent dosage of 0.05 g/100 mL, contact time of 50 min, pH 7.5, and temperature of 30 °C. The Freundlich model has the best match and suggests the biosorption process as a multi-layer. According to the results of free activation energy, biosorption process was also physical. As thermodynamic result, the biosorption behavior was found spontaneous and endothermic. Consequently, results showed RS as an economical biosorbent for reducing Al3+ of drinking water. Meanwhile, it can be considered as one of the most appropriate methods for management of rice paddies waste.