Potassium Adsorption Research Articles

Blowing Iron Chalcogenides into Two-Dimensional Flaky Hybrids with Superior Cyclability and Rate Capability for Potassium-Ion Batteries.

Chalcogenide-based anodes are receiving increasing attention for rechargeable potassium-ion batteries (PIBs) due to their high theoretical capacities. However, they usually exhibit poor electrochemical performance due to poor structural stability, low conductivity, and severe electrolyte decomposition on the reactive surface. Herein, a method analogous to "blowing bubbles with gum" is used to confine FeS2 and FeSe2 in N-doped carbon for PIB anodes with ultrahigh cyclic stability and enhanced rate capability (over 5000 cycles at 2 A g-1). Several theoretical and experimental methods are employed to understand the electrodes' performance. The density functional theory calculations showed high affinity for potassium adsorption on the FeS2 and FeSe2. The in situ XRD and ex situ TEM analysis confirmed the formation of several intermediate phases of the general formula KxFeS2. These phases have high conductivity and large interlayer distance, which promote reversible potassium insertion and facilitate the charge transfer. Also, the calculated potassium diffusion coefficient during charge/discharge further proves the enhanced kinetics. Furthermore, The FeS2@NC anode in a full cell also exhibits high cyclic stability (88% capacity retention after 120 cycles with 99.9% Coulombic efficiency). Therefore, this work provides not only an approach to overcome several challenges in PIB anodes but also a comprehensive understanding of the mechanism and kinetics of the potassium interaction with chalcogenides.

Vermikompost ile Birlikte Verilen Potasyum ve Fosforun Adsorbsiyonu Üzerine Bir Araştırma

Yurtdışında ve ülkemizde yapılan bazı çalışmalar göz önünde bulundurulduğunda, vermikompostun bitki verimi üzerinde etkili olduğu saptanmıştır. Ancak vermikompost kullanımından dolayı fosfor (P) ve potasyum (K) elementlerinin tutunmaları konusunda çalışma bulunmamaktadır. Denemede, organik bir madde olan vermikompostun P ve K elementlerini tutması üzerindeki etkisi araştırılmıştır. Deneme, iki bağımsız deneme şeklinde kurulmuş olup, P ve K elementlerinin tutunabilirliği takip edilmiştir. Denemede; vermikompost aynı dozda (1000 kg/da), P elementi (0, 4, 8, 12, 16 ve 20 kg P2O5/da) ve K elementi (0, 10, 20, 30, 40 ve 50 kg K2O/da) dozlarında kullanılmış ve 15 gün ara ile 6 yıkamaya tabi tutulmuştur. Perlit ortamına katılan vermikompost ile artan P2O5ve K2O uygulamaları incelendiğinde yıkanan P2O5 ve K2O miktarının 6 yıkama sonucunda düzenli olarak ortama katılan miktarları arttıkça yıkanan miktarının da arttığı saptanmıştır. Fosforda en fazla yıkanma 4 kgP2O5/da düzeyinde (%45.2), en düşük yıkanma ise 12 kgP2O5/da düzeyinde (%32.2) bulunmuştur. Potasyumda ise en fazla yıkanma 50 kgK2O/da düzeyinde (%66.8), en az yıkanma ise 10 kgK2O/da düzeyinde (%43.9) tespit edilmiştir.

Tuning the hybrid borophene−/graphene-ionic liquid interface: Effect of metal cations on the electronic and photonic properties

A density functional theory study of the effect of the adsorption of a mixture of potassium salt and an imidazolium-based ionic liquid on the electronic and optical properties of graphene and borophene is performed. This addition leads to a downward shift of the Dirac cone for both structures due to the electron transferred from potassium to the graphene and borophene sheets. The transferred charge to the wall and the binding energy of potassium are bigger than in the case of the adsorption of potassium on pristine graphene. The Bader analysis shows that the presence of potassium makes the charge distributions in graphene and the layers of boron atoms in borophene more homogenous and the electronic distribution in the sheets is consequently less affected by the electromagnetic interaction with the ions in the mixture. Moreover, the results show that the optical properties are altered by the metallic cation, especially at low frequencies where ionic liquid-enhanced 2D plasmons are registered due to the doping of 2D sheets by electrons transferred from the potassium atoms leading to near zero values of the parallel components of the dielectric function and refractive index.

Production of zeolitic materials in pilot scale based on coal ash for phosphate and potassium adsorption in order to obtain fertilizer.

The use of different types of zeolites (X, Na-P1, and 4A) synthesized by different methods and scales were tested in this work to adsorb nutrients present in synthetic solutions and industrial effluents for later application as fertilizer. Modifications with calcium chloride were performed on the zeolite with the best performance to increase its adsorption capacity. The best performing zeolite was type X (ZXH) produced on a pilot scale by the hydrothermal process. Its adsorption capacity without modification was 149 mg P-PO4/g zeolite and 349 mg K/g zeolite. With the change, there was a fourfold increase in these results, which were up to threefold higher than reported in the literature. The kinetic model that best characterized the adsorption process was the intraparticle diffusion model, and the equilibrium isotherm was that of Freundlich. The adsorption tests performed with industrial effluent showed high removal of the nutrients of interest (> 90% for PO43- and > 95% for K+). The desorption tests with zeolites nutrient-loaded from synthetic solutions showed 13 to 24% PO43- and 14 to 47% K+ release within 24 h, while for zeolite nutrient-loaded from effluent the release were 7 and 100% for PO43- and K+, respectively. The results we obtained in this work indicated the potential use of zeolites in the treatment of effluent and its application as a fertilizer.

Overdoping Graphene beyond the van Hove Singularity.

At very high doping levels the van Hove singularity in the π^{*} band of graphene becomes occupied and exotic ground states possibly emerge, driven by many-body interactions. Employing a combination of ytterbium intercalation and potassium adsorption, we n dope epitaxial graphene on silicon carbide past the π^{*} van Hove singularity, up to a charge carrier density of 5.5×10^{14} cm^{-2}. This regime marks the unambiguous completion of a Lifshitz transition in which the Fermi surface topology has evolved from two electron pockets into a giant hole pocket. Angle-resolved photoelectron spectroscopy confirms these changes to be driven by electronic structure renormalizations rather than a rigid band shift. Our results open up the previously unreachable beyond-van-Hove regime in the phase diagram of epitaxial graphene, thereby accessing an unexplored landscape of potential exotic phases in this prototype two-dimensional material.

Adsorption and Diffusion of Potassium on 2D SnC Sheets for Potential High‐Performance Anodic Applications of Potassium‐Ion Batteries

AbstractPertinent electrochemical characteristics based on K‐ion batteries (KIBs) represent a compelling class of electrode materials that may substitute lithium‐ion batteries, owing to their low cost and common abundance. In this paper, the structural, electronic, and electrochemical features of two‐dimensional (2D) material, the so‐called SnC monolayer, is investigated for anode applications employing first‐principle calculations. Pristine monolayer SnC is found to be an indirect band semiconductor with a band gap of 0.91 and 1.73 eV using PBE and HSE06 schemes, respectively. However, holding a small content of K on the T‐site, this 2D material has a semi‐metallic behavior (due to the defect state), while the conductivity is enhanced by undertaking the adsorption of K on the H‐site. As an anode material, monolayer SnC illustrates a low average open‐circuit voltage of 0.415 V for KIBs with a high K storage capacity of 410 mAhg−1. The low diffusion barrier (0.17 eV) on the surface of SnC sheet conducts fast charge/discharge cycles. Our results indicate that the 2D SnC could be a promising anode material for K‐ion batteries. According to these findings, we recommend that monolayer SnC can serve as expedient material with tunable capacity and high rate performance for next generation K‐ion batteries.

Does biochar application enhance soil salinization risk in black soil of northeast China (a laboratory incubation experiment)?

ABSTRACT Generally, application of biochar is an important management practice that can affect soil physico-chemical and biological properties. However, biochar is characterized by high pH and ash content, and due to this, little is known of potential salinization risk of application of biochar to soil. Laboratory incubation experiments were conducted with three replications comprising five treatments according to application rates of biochar (0, 50, 100, 200 and 400 g kg−1 (wt/wt)). The results indicated that application of corn straw biochar to black soil at the rate of 400 g kg−1 resulted in significant increases in soil pH, electrical conductivity (EC) and exchangeable K+ and soluble K+, Ca2+ and Mg2+, and decreases in cation exchange capacity (CEC) and exchangeable Ca2+ in comparison to untreated soil. Based on stepwise regression analysis, the dominant independent variable that affected soil pH was exchangeable K+ saturation percentage. In addition, EC was significantly positively related to potassium adsorption ratio (PAR). It was concluded that increased soil pH and EC are related to biochar (pyrolysis temperature of 600 °C) with higher concentration of K+ and lower CEC. This is due to increased exchangeable and soluble K+ and decreased soil buffering capacity from high application rate of biochar.

Comparative adsorption of diclofenac sodium and losartan potassium in organophilic clay-packed fixed-bed: X-ray photoelectron spectroscopy characterization, experimental tests and theoretical study on DFT-based chemical descriptors

Diclofenac sodium (DS) and losartan potassium (LP) are pharmaceuticals extensively used worldwide and contaminants of emerging concern. This work aims to examine the monocomponent continuous adsorption of DS and LP in fixed-beds packed with the organophilic clay, Spectrogel. The external surface of Spectrogel was studied by X-ray photoelectron spectroscopy (XPS) prior and post application as adsorbent. Continuous tests were conducted for the effects of flow rate (0.4–1.0 mL/min) and inlet concentration (0.05–0.15 mmol/L). Both DS- and LP-systems best operated at 0.4 mL/min and 0.15 mmol/L condition, which provided the highest breakthrough adsorption capacities (0.0047 mmol/g for DS and 0.0013 mmol/g for LP) and the lowest mass transfer zones (4.3 cm for DS and 4.4 cm for LP). Five different models were applied to describe the breakthrough curves and Dual site diffusion approach showed high suitability (R2 > 0.97). The DS adsorption performance by Spectrogel was contrasted with other materials. Density functional theory (DFT) computations were combined with experimental findings to clarify the particularities of DS and LP adsorption. Greater hydrophobicity, lower water solubility, reduced steric hindrance effects and greater chemical molecular reactivity were some of the factors attributed to the enhanced DS adsorption onto Spectrogel compared to LP.

Boosting the potassium storage performance of carbon anode via integration of adsorption-intercalation hybrid mechanisms

Abstract Graphitic carbon has been drawn extensive attention as an anode for Potassium-ion battery (KIB) because it is favorable for K-intercalation. However, the application of graphitic carbon anode for KIB is prevented by the poor cyclability and poor rate capability, resulting from the huge volume expansion and structural collapse after repeat charge/discharge. Herein, by advantageous functional integration of adsorption-intercalation potassium storage mechanisms, we design flexible nitrogen (N) and oxygen (O) dual-doped carbon coated graphene foam films (denoted as NOC@GF) that realizes unprecedented electrochemical performance for KIBs. Such advanced architecture can release the respective advantages of graphitic carbon with high electrical conductivity stability and favorable of K-intercalation, and amorphous heteroatoms doping carbon layers with abundant active sites for potassium adsorption storage. It delivers high reversible capacity (319 mA h/g at 0.1 A/g with a capacity retention of 94.9% after 550 cycles), long cycling stability (281 mA h/g at 1 A/g with a capacity retention of 98.1% after 5500 cycles), and excellent rate capability (123 mA h/g at 5.0 A/g). And density functional theory (DFT) calculations prove that N and O doping sites are benefit to facilitating K ion adsorption and the graphitic carbon promotes K-ion intercalation storage.

Self-supporting Prussian blue@CNF based battery-capacitor with superhigh adsorption capacity and selectivity for potassium recovery

Prussian blue (PB), due to its abundant interstitial sites and high theoretical specific capacity, offers a great possibility in battery and capacitive deionization application. Herein, we developed a facile strategy for in-situ growth of PB on an electrospun flexible Fe-rich porous carbon nanofiber (Fe-CNF) to obtain the self-supporting PB-inlaid CNF (PB@CNF). By simple incubation of Fe-CNF in a K4[Fe(CN)6] aqueous solution with the slow addition of acid, a large number of PB particles were evenly and tightly confined inside the pores of fibers with good stability. Being directly used as a self-supporting battery electrode, the PB@CNF delivered an excellent specific capacity of 318.4 F·g−1 owing to the uniform distribution of PB particles along the conductive CNF matrix. This self-supporting PB@CNF electrode has been applied successfully in battery-capacitor deionization device for selective potassium adsorption with a super-high adsorption capacity of 2.55 mmol·g−1 (equivalent of 190.1 mg·g−1 KCl adsorption) and excellent stability. In the synthetic seawater containing the coexistent Na+, Ca2+ and Mg2+, the recovery of K+ achieved 73.4%. This synthesis approach shows great potential for designing the flexible electrode for use in capacitor and batteries.

Influence mechanism of alkali metals on CO2 gasification properties of metallurgical coke

In order to clarify the function mechanism of alkali metal on degradation of metallurgical coke in blast furnace, the influence of alkali metal potassium and sodium on carbon structure change was investigated by gaseous adsorption method, and also the catalytic gasification reaction behaviors of alkali metal adsorbed coke samples was further studied. The results showed that the alkali metal vapor absorbed on coke has significant degradation effect on high temperature metallurgical properties of coke, which has catalytic effect and significantly increases gasification reactivity, and the catalytic limit of potassium vapor and sodium vapor was about 5% and 3%, respectively. Besides, potassium adsorption could also cause more fine coke particles to be produced, further aggravating degradation of coke in blast furnace. The analysis of physicochemical structures of different samples shows that the destruction of aromatic ring structure with dense and stable carbon structure in coke by alkali metal vapor adsorption process was the essential cause of coke reactivity increase and fracture. Kinetics analysis study shows that the random pore model (RPM) has the best performance representing the catalytic gasification process, and for different samples the activation energy first increases and then decreases with the increase of alkali metal adsorption content. It was also confirmed that there existed the kinetic compensation effect in the gasification process.

Selectivity coefficients of K, Na, Ca, and Mg in binary exchange systems in some calcareous soils.

One of the major issues in surveying the sorption and mobility of elements is awareness of the behavior and reactions of elements in soils and their distribution coefficient (Kd) values. This study was conducted to investigate the adsorption of potassium (K), sodium (Na), calcium (Ca), and magnesium (Mg) in six calcareous soils saturated with mentioned cations. The initial equivalent fraction of K, Na, Ca, and Mg in solutions increased from 0.1 to 1 at a total electrolyte of 30meqL-1. The shape of isotherm curves and the amount of cations adsorbed varied in different binary exchange systems. The adsorption of cations increased gradually with increasing initial concentrations. The average values of Kd (Lkg-1) in different binary systems were arranged in the following order: Ca-Mg (23.4) > Mg-Na (21.5) > Mg-K (20.7) > Mg-Ca (20.1) > Ca-Na (16.0) > Ca-K (15.4) > K-Mg (5.6) > K-Na (5.0) > K-Ca (4.6) > Na-Ca (2.7) > Na-Mg (1.9) > Na-K (1.7). The average values of Gaines-Thomas selectivity coefficients of cations in different binary exchange systems followed this order: K-Ca (16.5) > K-Mg (7.8) > Ca-Mg (4.1) > Mg-Ca (3.1) > Mg-Na (2.1) > K-Na (1.7) > Mg-K (1.0) > Ca-Na (0.8) > Ca-Na (0.6) > Na-Ca (0.5) > Na-Mg (0.1) = Na-K (0.1). So, the affinity of cations for adsorption by soils followed this order: K > Ca > Mg > Na which differed from the classical lyotropic series. The high affinity of K for adsorption by soils was attributed to the presence of illite. The free cations were the most abundant species (above 90%) in all soil solutions after reaching equilibrium with initial concentrations of 3 and 30meqL-1. The saturation index (SI) values of minerals in all exchange systems were negative.

Theoretical prediction of T-graphene as a promising alkali-ion battery anode offering ultrahigh capacity.

The pursuit of high capacity is one of the key challenges for the development of alkaline ion batteries (AIBs, namely Li/Na/K-ion batteries; LIBs, NIBs, or KIBs). Carbon-based anode materials represented by graphite have been widely used in secondary batteries; however, their storage capacity is generally not high. Graphene was once considered a promising candidate, but it has proven to be incapable of interacting strongly with alkali ions. Here, by first-principles calculations, we predict an allotrope of graphene that may soon be experimentally synthesized, called T-graphene, which is a promising anode material for AIBs. We find that when it is used as the anode for NIBs, its theoretical capacity can be as high as 2232 mA h g-1 (Na6C6), which is six times that of graphite. For LIB and KIB anodes, the specific capacities are 744 mA h g-1 and 1116 mA h g-1, corresponding to the Li2C6 and K3C6 chemical formula, respectively. We first demonstrate that the material is mechanically stable. We further show that the material has good electrical conductivity whether it is before or after adsorption of Li(Na or K). We also studied the diffusion of Li(Na or K) on its surface and found that their corresponding diffusion barriers are very low (Li, Na and K are about 0.37 eV, 0.35 eV and 0.25 eV, respectively), which means good rate performance. It is calculated that the average open circuit voltage of the corresponding three half-cells at full charge is also low (LIBs is about 0.20 V, NIBs is about 0.12 V, and KIBs are about 0.37 V), which is beneficial for increasing the operating voltage of the full battery. In addition, during the adsorption of lithium, sodium and potassium, the lattice change of the material is very small (about 1.0% for lithium, about 1.4% for sodium, and about 1.9% for potassium), which means good cycling performance. These results indicate that T-graphene is expected to replace graphene and become a very attractive anode material for AIBs.

Cation Exchange Resins as Indicator of In-Season Potassium Supply for Soybean in Kansas

The use of ion-exchange resins to measure soil nutrient availability has potential applications for fertilizer recommendations. The objective of this study was to evaluate the relationship between potassium (K) adsorption by cation exchange resins (CER) and K uptake by soybean in field conditions. The study was conducted at two locations in Kansas during 2019. Two treatments were selected to evaluate the CER. Treatments included a check (0 lb K2O/a) and a high K rate with 150 lb K2O/a applied pre-plant and incorporated. The Plant Root Simulator (PRS, Western Ag Innovations, Saskatchewan, Canada) was used as an indicator of in-season K supply to soybean. In addition, whole plant samples were collected at V4, R2, R4, and R6 stages to measure plant K uptake. Soil moisture content was calculated based on soil samples collected at the beginning and end of each burial period. The CER was able to adsorb more K (measured as cumulative adsorption) when K fertilizer (150 lb K2O/a) was applied. Data showed a positive relation between CER values and soil moisture content. Preliminary results from this study suggest that CER can be used as an indicator of K supply, particularly in soils with low soil test K levels.

Adsorption and Desorption of Nitrogen, Phosphorus, Potassium, and Soil Buffering Capacity Following Application of Chicken Litter Biochar to an Acid Soil

Adsorption and desorption of nitrogen (N), phosphorus (P), and potassium (K) soils are controlled by pH, pH buffering capacity, organic matter, and cation exchange capacity (CEC). These factors optimized to improve timely availability of N, P, and K crop use using organic amendments such as chicken litter biochar (CLB). The objective of this study was to determine the effects of CLB on N, P, K sorption and pH buffering capacity of an acid soil. Different rates of CLB were mixed with an acid soil for N, P, and K sorption and pH buffering capacity determination. The CLB increased soil pH and pH buffering capacity, but unlike P and K adsorption, the different rates of CLB significantly increased N adsorption, suggesting that this soil amendment has high affinity for N than P and K. Also, because CLB reduced N, P, and K desorption, it suggests that N in particular will be slowly released with time. The reduced N desorption but higher N adsorption further indicates that N can be temporary fixed by CLB. This work has revealed CLB is more effective controlling soil N availability for timely crop use to avoid losses.

Groundwater Quality Assessment for Sustainable Drinking and Irrigation

Identification and management of the groundwater quality are of utmost importance for maintaining freshwater resources in arid and semi-arid areas, which is essential for sustainable development. Based on the quality of the groundwater in various areas, local policymakers and water resource managers can allocate the usage of resources for either drinking or agricultural purposes. This research aims to identify suitable areas of water pumping for drinking and agricultural harvest in the Tabriz aquifer, located in East Azerbaijan province, northwest Iran. A groundwater compatibility study was conducted by analyzing Electrical conductivity (EC), total dissolved solids (TDS), Chloride (Cl), Calcium (Ca), Magnesium (Mg), Sodium (Na), Potassium (K), Sulfate (SO4), Total hardness (TH), Bicarbonate (HCO3), pH, carbonate (CO3), the and Sodium Adsorption Ratio (SAR) obtained from 39 wells in the time period from 2003 to 2014. The Water Quality Index (WQI) and irrigation water quality (IWQ) index are respectively utilized due to their high importance in identifying the quality of water resources for irrigation and drinking purposes. The WQI index zoning for drinking classified water as excellent, good, or poor. The study concludes that most drinking water harvested for urban and rural areas is ‘excellent water’ or ‘good water’. The IWQ index average for the study area is reported to be in the range of 25.9 to 34.55. The results further revealed that about 37 percent (296 km2) of groundwater has high compatibility, and 63 percent of the study area (495 km2) has average compatibility for agricultural purposes. The trend of IWQ and WQI indexes demonstrates that groundwater quality has been declining over time.

Electrical Tuning of the Excitonic Insulator Ground State of Ta_{2}NiSe_{5}.

We demonstrate that the excitonic insulator ground state of Ta_{2}NiSe_{5} can be electrically controlled by electropositive surface adsorbates. Our studies utilizing angle-resolved photoemission spectroscopy reveal intriguing wave-vector-dependent deformations of the characteristic flattop valence band of this material upon potassium adsorption. The observed band deformation indicates a reduction of the single-particle band gap due to the Stark effect near the surface. The present study provides the foundation for the electrical tuning of the many-body quantum states in excitonic insulators.

Production and characterization of alginate beads for growth of immobilized Desmodesmus subspicatus and its potential to remove potassium, carbon and nitrogen from sugarcane vinasse

Abstract Among the main industrial wastewaters, sugarcane vinasse figures as an actual environmental concern, due to its polluting potential and large volumes available, about 10–15 L per liter of ethanol. Microalgae immobilization in biopolymeric matrices, such as alginate, represents a promising strategy for wastewater treatment aiming the removal of nutrients. Alginate beads for immobilization of Chlorophyceae microalgae D. subspicatus were prepared with different biopolymer and crosslinking agent concentrations. Alginate beads showed good stability in vinasse probably owned to wastewater high calcium content. The growth of immobilized and free microalgae in sugarcane vinasse (bulk phase) and its potential to remove potassium, carbon and nitrogen from this wastewater were evaluated. Immobilized D. subspicatus showed maximum specific growth rate (μmax) of 0.009 h-1 for alginate beads (2%) crosslinked with 5% CaCl2, with 38, 27 and 28% of carbon, nitrogen and potassium removal. Free microalgae cultivation exhibit two μmax of approximately 0.01 h-1 (between 0-24 h and 48–72 h) and maximum carbon, nitrogen and potassium removals of 45, 49 and 8%, respectively. Potassium adsorption by the biopolymer matrix was significant, with maximum removals (37 and 35%) obtained by blank and immobilized microalgae alginate beads (2%) crosslinked with 10% CaCl2. Results indicate interesting perspectives for the use of D. subspicatus immobilized in alginate for removal of nutrients from sugarcane vinasse.

Design of a 1D/2D C3N4/rGO composite as an anode material for stable and effective potassium storage

The research and development of potassium ion battery (KIB) is still currently at infancy stage due to the lack of materials that facilitate rapid K+ transport and subsequently deliver high energy capacity and power density. Our Density Functional Theory (DFT) calculations suggest that the high potassium adsorption energy (3.01 eV) on 1D-C3N4, a lower potassium diffusion barrier and the superior electronic conductivity of graphene will be beneficial for the intercalation of K+. In this work, a 1D/2D C3N4/reduced graphene oxide (rGO) composite was designed and synthesized as an anode material to address these needs via a hydrothermal/freeze drying method. As a host for K+ ions, the as prepared composite delivered a remarkable specific capacity of 464.9 mAh/g after 200 cycles at 1 A/g and 228.6 mAh/g after 1000 cycles at 10 A/g, which is one of the best reported so far. The exceptional performance of this composite can be attributed to the large surface area for additional active sites, shorter K+ diffusion distance, structural stability and the synergistic interaction between 1D C3N4 and 2D rGO. This work broadens the design and application of composites and fosters the advancement in potassium ion battery research.

Ab initio study of the adsorption of Potassium on B, N, and BN-doped graphene heterostructure

The adsorption of Potassium atom on graphene doped with Nitride, Boron, and Boron nitride hexagons is studied using DFT with LDA and GGA for both spin and non-spin polarization calculations. The distortion in graphene resulting from Boron nitride doping is unnoticeable; alternatively, pure Boron and Nitrogen hexagons introduce high level of distortion in the layer. Adsorption energy, structural geometry, density of state, band structure, charge density, charge transfer, dipole moment and work function are calculated. For Boron and Nitrogen hexagons-doped graphene, the adsorption energy of Potassium increases dramatically compared to pristine graphene, but in the case of Boron nitride hexagons, calculations show weak adsorption energy of Potassium on the doped sheet. The doping of graphene with Boron nitride opens a small band gap, and the adsorption of Potassium rises the Fermi level above the opened gap leading to the formation of n-type semiconductor. Co-existence of partial covalent bond and ionic bond between Potassium and the doped graphene has been demonstrated. The transfer of charges is calculated in four different methods, one by using Bader analysis and the other three are based on DOS, average charge density difference and electric dipole moment.