Chemical Engineering Journal Advances最新文献

{"title":"Development of a novel physics-informed machine learning model for advanced thermochemical waste conversion","authors":"Surika van Wyk","doi":"10.1016/j.ceja.2024.100699","DOIUrl":"10.1016/j.ceja.2024.100699","url":null,"abstract":"<div><div>A physics-informed machine learning (ML) model, which incorporates the conservation of carbon mass, was developed to predict the product gas yield and composition for indirect gasification of waste in a fluidized bed. A dataset was compiled from experimental data of an in-house reactor, encompassing a wide range of feedstocks characteristics (biomass to plastics) and process conditions, which served as input for the model. Four data-driven models were trained and evaluated, with the XGBoost model having the best predictive accuracy (RMSE = 1.1 &amp; R² = 0.99) and being adapted for the physics-informed model. The optimum physics contribution was 30 % (70 % data contribution) to maintain predictive accuracy (RMSE = 2.7 &amp; R² = 0.95) and improve carbon closure. Feedstock properties were shown to have a higher feature importance compared to the operating conditions. The developed physics-informed model demonstrated the potential of ML models for the modelling of gasification of various waste streams. This is a promising first step towards improving data-driven ML models for application to thermochemical systems.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100699"},"PeriodicalIF":5.5,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spout diameter in fine particle conical spouted beds: Assessing the influence of draft tubes by PTV","authors":"Maider Bolaños,&nbsp;Xabier Sukunza,&nbsp;Mikel Tellabide,&nbsp;Idoia Estiati,&nbsp;Haritz Altzibar,&nbsp;Miriam Arabiourrutia,&nbsp;Martin Olazar","doi":"10.1016/j.ceja.2024.100696","DOIUrl":"10.1016/j.ceja.2024.100696","url":null,"abstract":"<div><div>The spout diameter is an essential parameter for designing spouted bed contactors, as it conditions the gas–solid contact and heat and mass transfer rates. Several correlations have been proposed in the literature to estimate the spout size, but they do not provide accurate results in beds made up of fine particles, especially when they are equipped with open-sided draft tubes. Accordingly, the spout–annulus interface has been determined by means of Particle Tracking Velocimetry (PTV) and the spout shape has been delineated under different operating conditions in fountain confined conical spouted beds of varying geometric parameters. The air inlet diameter and gas velocity, as well as the aperture ratio of the open-sided draft tubes, are the parameters of greatest influence. Accordingly, a new correlation has been proposed, which allows predicting accurately the spout size in beds without draft tube, as well as those equipped with open-sided ones.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100696"},"PeriodicalIF":5.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Producing hydrogen from biomass and seawater using immobilized carbon nitride photocatalysts","authors":"Ana L. Machado ,&nbsp;Ricardo A. Oliveira ,&nbsp;Goran Dražić ,&nbsp;Joana C. Lopes ,&nbsp;Cláudia G. Silva ,&nbsp;Joaquim L. Faria ,&nbsp;Maria J. Sampaio","doi":"10.1016/j.ceja.2024.100697","DOIUrl":"10.1016/j.ceja.2024.100697","url":null,"abstract":"<div><div>To address the challenges related with using powdered catalysts and freshwater in photocatalytic hydrogen (H₂) production, this study explores the performance of carbon nitride-based catalyst immobilized on a 3D structure, employing seawater as a proton source. Methanol and saccharides such as cellobiose, fructose, glucose, saccharose and sorbitol were used as sacrificial agents to accelerate H₂ production via photoreforming. The results using immobilized photocatalyst showed that, at similar molar concentrations, glucose reveals higher efficiency compared with methanol, achieving an amount of H₂ evolution of 102 µmol after 180 min under visible light, compared to 45 µmol with methanol. Among the mono- and polysaccharides used, cellobiose has emerged as the most promising for H₂ evolution, achieving the highest amount of H₂ (124 µmol) after 180 min reaction. This result suggests a correlation between the efficiency of scavenging holes and the number of hydroxyl groups in the electron donor's structure. Despite a slight decrease in H₂ evolution compared with the powdered catalysts, the use of immobilized photocatalyst exhibited remarkable stability in both ultrapure water and seawater, maintaining its performance across multiple reuse cycles. The photocatalytic system demonstrated remarkable efficiency for H₂ production, avoiding phases separation processes, promotes the transition to continuous flow reactors and preserve freshwater resources.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100697"},"PeriodicalIF":5.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143173987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transition of BiOCl nanosheet into cotton-like clusters for piezoelectric enhanced photocatalytic degradation of dye and photocatalytic hydrogen production","authors":"Zheng Luo ,&nbsp;C.P. Leo ,&nbsp;Fengbo Guo ,&nbsp;Xin-ya Zhao","doi":"10.1016/j.ceja.2024.100698","DOIUrl":"10.1016/j.ceja.2024.100698","url":null,"abstract":"<div><div>Photocatalysts offer sustainable treatment of water pollutants using light and they can be further piezoelectrically enhanced. As a highly efficient, stable, and environmentally friendly photocatalytic material, bismuth oxychloride (BiOCl) exhibits significant advantages in the degradation of rhodamine B, but its morphology can be easily affected by solvothermal synthesis. In this study, the solvent effects of ethylene glycol and water were compared in the presence of polyvinylpyrrolidone (PVP) through solvothermal and hydrothermal reactions, respectively. X-ray diffraction patterns, Fourier-transform infrared spectra, and X-ray photoelectron spectra confirmed the formation of BiOCl nanosheets with numerous oxygen-rich vacancies. Scanning electron microscopy and transmission electron microscopy images showed circular plate-like structures or spherical clusters with a diameter of approximately 1 μm when BiOCl was prepared using water or without the addition of PVP, respectively. The plate-like structure and the spherical clusters transformed into cotton-like spherical clusters assembled from ultra-thin nanosheets with diameters ranging from 20 to 50 nm after using ethylene glycol and PVP. UV–vis absorption spectra showed that BiOCl with a cotton-like spherical structure could achieve higher dye degradation efficiency than BiOCl with a plate-like or spherical structure. The piezoelectric-enhanced photodegradation rates of rhodamine B were significantly increased by about 22 times since the piezoelectric photocurrent intensities rose nearly three times and the generation of •O₂⁻ and •OH increased. The photocatalytic hydrogen production was improved by 55.3 % and sustained up to 4 cycles due to the conduction band reduction, as proven by the Mott-Schottky plot.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100698"},"PeriodicalIF":5.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Limited data based kinetic modeling and optimization of propionic acid synthesis over supported Rh/C catalyst","authors":"László Balogh ,&nbsp;Jenő Bódis ,&nbsp;Botond Szilágyi ,&nbsp;Ágnes Bárkányi ,&nbsp;Attila Egedy","doi":"10.1016/j.ceja.2024.100693","DOIUrl":"10.1016/j.ceja.2024.100693","url":null,"abstract":"<div><div>The importance and need for greener and more sustainable chemical processes and technologies can hardly be overestimated. However, many industries still produce a considerable amount of waste. Reusing these waste streams is an indispensable piece towards realizing fully circular and sustainable economy. Accordingly, it is imperative to operate chemical processes with maximal recycling to minimize waste generation. The study presents in the aforedescribed spirit, the synthesis of propionic acid, where the various goals are optimally realized by unleashing the predictive power of nonlinear process model. A method for synthesizing propionic acid is through the heterogeneous catalytic reaction route between ethylene gas, carbon monoxide, and water. The atom efficiency of the process is 100% with the possibility of fully separating the products and recirculating the unreacted starting materials. Hence, the chemistry of the proposed catalytic route is material efficient. To make the process operate well, we apply the available measured data co construct a kinetic model, and use it to optimize the system subject to various goals. The data were not primarily measured for modeling, but for parametric reactor analysis. Yet, using the apriori knowledge about the process (i.e., the microkinetics of the reactions), the data enabled the kinetic model identification, resulting in a fitting on the measured outputs characterized by a coefficient of determination of 0.76. The operating parameters were optimized by using this model to enhance the energy and material efficiency of the process. The optimized turnover frequency happened to be is 3.974 <span><math><mrow><mtext>mol</mtext><mo>/</mo><msup><mrow><mtext>m</mtext></mrow><mrow><mn>3</mn></mrow></msup><mtext>catalyst/s</mtext></mrow></math></span>, reached at 264 °C, 12 bar and ethylene:CO:H<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O:EtI = 0.379:0.098:0.506:0.016 starting material ratio.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100693"},"PeriodicalIF":5.5,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dense integration of chlorocatechols crosslinked polyphenylene sulfide solid-state separator for Li metal-free batteries","authors":"Haitao Zhou ,&nbsp;Lianlu Wan ,&nbsp;Jiacheng Han ,&nbsp;Jian-Chun Wu ,&nbsp;Yihong Deng ,&nbsp;Jie Gu ,&nbsp;Huanggang Wang ,&nbsp;Hongquan Gao ,&nbsp;Zilong Su","doi":"10.1016/j.ceja.2024.100694","DOIUrl":"10.1016/j.ceja.2024.100694","url":null,"abstract":"<div><div>Dry electrode film fabrication technology, known for its environmental friendliness and low energy consumption, is recognized as an effective industrial approach for producing highly dense solid-state electrolytes and pore-free separators. It holds promise for applying thin lithium metal and Li metal-free anodes in ultra-high energy density Li-ions batteries. However, the films produced by this method suffer from issues such as poor toughness, low strength, uneven thickness, and difficulties in rewinding, which limit its widespread adoption in the large-scale manufacturing of lithium batteries. In this study, we propose a hydrothermal process to introduce a chlorocatechol-based cross-linker onto the surface of highly crystalline polyphenylene sulfide (PPS) powder. By employing the dry electrode process, a PPS-based solid-state separator (PPS-SSS) is fabricated, featuring a thin profile (18±2 μm), a smoother surface, and a denser structure, significantly enhancing its mechanical properties. Moreover, the dense integration structure and chlorocatechol groups contribute to a higher Li⁺ transference number and more effectively inhibit the growth of Li dendrites. Li metal-free batteries, constructed with this separator, a Sn-plated Cu 10 μm foil anode, and a thick high-nickel cathode dry electrode, exhibit high discharge areal and specific capacities (5 mAh cm⁻² and 200 mAh <em>g</em>⁻¹, respectively) and pouch battery device energy density exceeding 440 Wh kg⁻¹. Impressively, even in the presence of Cu or Fe powder contamination on the CuSn foil anode or cathode, this separator can still achieve uniform electric field distribution and lithium deposition, demonstrating good cycle stability.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100694"},"PeriodicalIF":5.5,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plant growth-promoting bacteria and nanomaterials synergism to enhance Lolium perenne growth and phytoremediation in cadmium-contaminated soil","authors":"Asifa Farooqi ,&nbsp;Ejaz ul Haq ,&nbsp;Anders Johansen ,&nbsp;Lea Ellegaard-Jensen ,&nbsp;Mazhar Iqbal ,&nbsp;Sohail Yousaf ,&nbsp;Maximilian Lackner","doi":"10.1016/j.ceja.2024.100695","DOIUrl":"10.1016/j.ceja.2024.100695","url":null,"abstract":"<div><div>Innovative integrated approaches of nanoparticles (NP) and plant growth-promoting bacteria (PGPB) can accelerate plant growth and remediation of cadmium (Cd) contaminated soil. The effectiveness of the combination and interactions amongst Cd-resistant PGPB, ryegrass (<em>Lolium perenne</em>), graphene nanoplatelets (GNPs), and graphitic carbon nitride (g-C₃N₄) nanomaterials have not yet been elucidated. Cd-spiked soil was supplemented with GNPs, g-C₃N₄, and inoculated with bacterial strains (<em>Serratia bozhouensis</em> and <em>Serratia marcescens</em>). The PGPB and GNPs combination produced the highest biomass, enhancing the accumulation of Cd in ryegrass. The highest Cd uptake (92 %) by ryegrass was observed in <em>Serratia bozhouensis</em> and GNPs treatments. The reasons for increased plant growth and Cd-phytoremediation by the PGPB-GNPs combination are explained. GNPs application promoted PGPB survival in the rhizosphere. Inoculant strains showed a high relative abundance of &gt;82 % in the inoculated treatments. The exchangeable Cd fraction significantly increased in PGPB-GNPs treatments. The highest exchangeable Cd (80 %) was noted with <em>Serratia bozhouensis</em> and GNPs. PGPB also increased the dehydrogenase, catalase, phosphatase, and urease enzyme activity in soil. The PGPB-GNPs combination also reduced the Cd-induced stress injury to ryegrass through increased production of antioxidants. The present work supports our understanding of the synergistic effects of nanomaterials, bacteria, and plants, thus boosting their role in restoring heavy metal-contaminated soils.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100695"},"PeriodicalIF":5.5,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The mechanism of sulfidation roasting pretreatment of cerussite for enhanced flotation behavior","authors":"Yu Miao ,&nbsp;Wanting Yang ,&nbsp;Xuemin Ding ,&nbsp;Jiarui Min ,&nbsp;Bao Guo ,&nbsp;Xiangxiang Chen ,&nbsp;Chun Yu","doi":"10.1016/j.ceja.2024.100689","DOIUrl":"10.1016/j.ceja.2024.100689","url":null,"abstract":"<div><div>Lead is an indispensable non-ferrous metal for industrial development. As primary galena(PbS) resources are being exhausted, the utilization of lead oxide ore resources have become increasingly important. Compared with the conventional lead oxide surface sulfidation flotation method by NaHS dosing in the pulp, the roasting sulfidation pre-treatment method has the characteristics of high efficiency and suitable for various types of ores. In this paper, we firstly demonstrate that pyrite(FeS₂) can provide a sulfurous atmosphere to convert cerussite(PbCO₃) into galena(PbS) through thermodynamic calculations. Then, the reaction conditions were optimized through the roasting sulfidation conditions such as the contact mode, time and temperature of the reaction, and the sulfidation mechanism of cerussite at high temperature roasting was studied by using XRF, XRD, SEM and XPS. It was clarified that the sulfidation of cerussite was progressed by reacting with sulfur-based atmosphere from the surface layer to form PbS, and then gradually penetrating into the inner layer until PbS was completely generated, and the recovery rate was increased from 14.95 % to &gt;80 % after optimization.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100689"},"PeriodicalIF":5.5,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptation of an additively manufactured reactor concept for catalytic methanation with in-situ tar co-reforming of biogenic syngas","authors":"Jakob Müller,&nbsp;Alexander Feldner,&nbsp;Simon Markthaler,&nbsp;Peter Treiber,&nbsp;Jürgen Karl","doi":"10.1016/j.ceja.2024.100692","DOIUrl":"10.1016/j.ceja.2024.100692","url":null,"abstract":"<div><div>The methanation of biogenic syngas for GreenLNG production is a promising alternative for fossil gas. The market price of renewable methane is currently still too high to compete with fossil LNG. One of the reasons for that is the extensive gas cleaning that is necessary for the methanation of syngas from the thermochemical gasification of biomass. A main cost factor is the removal of tar components. As part of the Horizon Europe project CarbonNeutralLNG, we propose a 3D-printed methanation reactor, which makes use of the freedom in design gained by the additive manufacturing process in order to adapt the reactor design for the in-situ co-reforming of tars. The reactor uses heat pipes and a conically widened reaction channel to effectively control local temperatures, suiting the needs of the methanation reaction. A temperature hot spot near the inlet provides the necessary conditions (high temperature, a suitable catalyst and sufficient residence time) for the reforming of tar species, that are present in the syngas. Two reactor concepts are proposed. ADDmeth3.1 uses a dedicated internal channel structure that serves as a counter-current heat exchanger for the feed gas, whereas ADDmeth3.2 is optimized to fill the triangular footprint of a scalable reactor module as best as possible. Both designs were subject to a preliminary feasibility study, to ensure sufficient heat removal and a finite element analysis regarding structural stability was performed. Minimum safety factors against yielding of 3.53 and higher were achieved even without the internal diamond lattice support structure. The triangular modular reactor cell can easily be scaled up by connecting multiple cells in parallel, since the triangular shape can be extended efficiently into a honeycomb pattern.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100692"},"PeriodicalIF":5.5,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards sustainable solutions: Comprehensive review of advanced porous materials for CO₂ capture, hydrogen generation, pollutant degradation, and energy application","authors":"Iltaf Khan ,&nbsp;Anam Altaf ,&nbsp;Samreen Sadiq ,&nbsp;Shoaib Khan ,&nbsp;Aftab Khan ,&nbsp;Sohail Khan ,&nbsp;Muhammad Humayun ,&nbsp;Abbas Khan ,&nbsp;Rasha A. Abumousa ,&nbsp;Mohamed Bououdina","doi":"10.1016/j.ceja.2024.100691","DOIUrl":"10.1016/j.ceja.2024.100691","url":null,"abstract":"<div><div>Recently, there have been significant developments in advanced porous materials, especially with types like porous organic polymers, metal-organic frameworks, hydrogen-bonded organic frameworks, covalent organic frameworks, zeolites, and porous aromatic frameworks. These materials are gaining attention for their remarkable characteristics, including high surface area, adjustable pore sizes, strong adsorption capacity, stability under various conditions, effective catalytic properties, and good electrical conductivity, making them useful across a range of applications. This review article highlights the various types, structures, and synthesis methods of POPs, MOFs, HOFs, COFs, zeolites, and PAFs, in addition to their important applications such as hydrogen generation, gas sensing, CO₂ conversion, pollutant degradation, CO₂ capture, hydrogen evolution/oxygen evolution reactions, and batteries. Lastly, the future perspective of APMs along with the necessary steps to be taken and embraced in order to make them usable for long-term and large-scale applications will help in opening new innovative gateways to the research field.</div></div>","PeriodicalId":9749,"journal":{"name":"Chemical Engineering Journal Advances","volume":"21 ","pages":"Article 100691"},"PeriodicalIF":5.5,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}