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adsorption performance of Sliding Wall-Climbing Robot

Chinese Journal of Mechanical Engineering 2010年第6期23卷 733-741页

作者： LI Jun GAO Xueshan FAN Ningjun LI Kejie JIANG Zhihong JIANG Zhijian School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China School of Electric and Information Engineering Beijing University of Civil Engineering and Architecture Beo＇ing 100044 China

Sliding wall-climbing robot （SWCR） is applied worldwide for its continuous motion, however, considerable air leakage causes two problems： great power consumption and big noise, and they constraint the robot＇s comprehensive performance. So far, effective theoretical model is still lacked to solve the problems. The concept of SWCR＇s adsorption performance is presented, and the techniques of improving utilization rate of given adsorption force and utilization rate of power are studied respectively to improve SWCR＇s adsorption performance. The effect of locomotion mechanism selection and seal＇s pressure allocation upon utilization rate of given adsorption force is discussed, and the theoretical way for relevant parameters optimization are provided. The directions for improving utilization rate of power are pointed out based on the detail analysis results of suction system＇s thermodynamics and hydrodynamics. On this condition, a design method for SWCR-specific impeller is presented, which shows how the impeller＇s key parameters impact its aerodynamic performance with the aid of computational fluid dynamics （CFD） simulations. The robot prototype, BIT Climber, is developed, and its functions such as mobility, adaptability on wall surface, payload, obstacle ability and wall surface inspection are tested. Through the experiments for the adhesion performance of the robot adsorption system on the normal wall surface, at the impeller＇s rated rotating speed, the total adsorption force can reach 237.2 N, the average effective negative pressure is 3.02 kPa and the design error is 3.8% only, which indicates a high efficiency. Furthermore, it is found that the robot suction system＇s static pressure efficiency reaches 84% and utilization rate of adsorption force 81% by the experiment. This thermodynamics model and SWCR-specific impeller design method can effectively improve SWCR＇s adsorption performance and expand this robot applicability on the various walls. A sliding wall-climbing

关键词： wall-climbing robot adsorption performance centrifugal impeller CFD simulation

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Influence and its mechanism of temperature variation in a muffle furnace during calcination on the adsorption performance of rod-like MgO to Congo red

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Frontiers of Materials Science 2018年第3期12卷 304-321页

作者： Yajun ZHENG Liyun CAO Gaoxuan XING Zongquan BAI Hongyan SHEN Jianfeng HUANG Zhiping ZHANG School of Material Science and Engineering Shaanxi University of Science and Technology Xi'an 710021 China School of Chemistry and Chemical Engineering Xi'an Shiyou University Xi'an 710065 China School of Earth Sciences and Engineering Xi'an Shiyou University Xi'an 710065 China

Calcination temperature plays a crucial role in determining the surface properties of generated MgO, but the influence of temperature variation in a muffle furnace during calcination on its performance is rarely reported. Herein we observed that the temperature in a muffle furnace during calcination demonstrated a gradually increasing trend as the location changed from the furnace doorway to the most inner position. The variation in temperature had a great impact on the adsorption performance of generated rod-like MgO without and/or with involvement of Na2SiO3 to Congo red in aqueous solution. To get a better understanding on the detailed reasons, various techniques including actual temperature measurement via multimeter, N2 physical adsorption, CO2 chemical adsorption and FT-IR spectrometry have been employed to probe the correlation between the adsorption performance of generated MgO from various locations and the inner actual temperature of used muffle furnace as well as their physicochemical properties. In addition, two mechanisms were proposed to elucidate the adsorption process of Congo red over the surface of generated MgO without and/or with presence of Na2SiO3, respectively.

关键词： magnesium oxide calcination muffle furnace placed location adsorption performance

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adsorption performance of Activated Carbon Prepared from Corn Stalks

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Agricultural Science & Technology 2016年第10期17卷 2221-2224,2231页

作者：刘恩海王长忠刘圣勇潘嘉信赵坤正徐云婷苏之勇中原工学院能源与环境学院河南郑州450007 郑州市工信节能检测中心河南郑州450007 河南农业大学农业部可再生能源重点开放实验室河南郑州450002 西安建筑科技大学环境与市政工程学院陕西西安710055

[Objective] This study aimed to study the adsorption performance of activated carbon prepared from corn stalks. [Methed] With granular activated carbon prepared from corn stalks as research object, adsorption performance simulation test equipment was set up to investigate the adsorption performance of the prepared activated carbon for methanol by static weight method. In addition, the effects of adsorption bed structure, activated carbon particle size in adsorption bed, addition amount of graphite powder in activated carbon and modified activated carbon on systematic adsorption performance were studied. [Result] Under conditions of same activated carbon and same adsorption temperature, the adsorption performance of new adsorption bed A （installed with finned diaphragm adsorbate tubes） was signifi- cantly better than that of unmodified adsorption bed B. Compared with adsorption bed B, adsorption bed A took 5 min shorter to reach the adsorption amount of 0.22 g/g. Under the same adsorption temperature, the adsorption performance of bed loaded with different-particle size activated carbon was significantly better than that loaded with same-particle size activated carbon. The bed loaded with different-particle size activated carbon took 16 min shorter to reach the adsorption capacity of 0.22 g/g compared with the bed loaded with same-particle size activated carbon. Adding proper amount of graphite powder in activated carbon could enhance the thermal conductivity and strengthen the adsorption properties. The optimum addition amount of graphite powder was 20% of the total amount of activated carbon. Com- pared with that of the control, the adsorption performance of activated carbon soaked by weak acidic solution was significantly improved. It took 3 min shorter to reach 87.1% of the equilibrium adsorption amount. [Conclusion] This study will provide reference for optimizing structural design of adsorption bed and adsorption refrigeration system.

关键词： Corn stalks Activated carbon Static weight method adsorption performance

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Preparation and adsorption performance of Hydroxyapatite/Attapulgite Composite Beads

Preparation and Adsorption Performance of Hydroxyapatite/Att...

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2013年水资源生态保护与水污染控制研讨会

作者： Li Feng Xiaofeng Shi Zeshan Liu Maosen Ju School of Chemical Engineering and Technology China University of Mining and Technology

Hydroxyapatite/ attapulgite composite beads(HAP/ATT) were made through mixing hydroxyapatite and attapulgite at certain ratio and spheroidizing. Hydroxyapatite was synthetized by wet chemical methods at different calcium phosphorous ratio, and the product with the highest defluoridation capacity was selected as mission ball. The spheroidization process hasn’t changed the structure and properties of hydroxyapatite characterized by FTIR and XRD. The adsorption process of HAP/ATT is influenced by adsorption time, temperature and pH value. The adsorption approaches to equilibrium within 80 mins. High temperature is conducive to the adsorption process. The optimum pH value of adsorption process is about *** adsorption process is close to the monolayer adsorption. It is a spontaneous endothermic process(ΔHθ> 0,ΔGθ adsorption process.

关键词： hydroxyapatite/attapulgite composite beads preparation adsorption performance defluoridation

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Preparation of borate anions intercalated MgAl-LDHs microsphere and its calcinated product with superior adsorption performance for Congo Red

Preparation of borate anions intercalated MgAl-LDHs microsph...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Ya-Huan Jia Zhi-Hong Liu Key Laboratory for Macromolecular Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal University

In the present study,the borate anions intercalated MgAl-layered double hydroxides(B-LDHs) microsphere was synthesized by a simple adsorption method in borax solution using 500℃ calcinated monodispersed MgAl-LDH as precursor *** the porous B-LDOs sample was prepared by calcination of B-LDHs sample at 800 ℃ according to the simultaneous TG-DSC curves of the B-LDHs sample,as shown in *** samples were characterized by the XRD,FT-IR,XPS,TG-DSC,SEM and *** B-LDHs microsphere with hierarchical porous nanostructure was assembled by *** B-LDHs and B-LDOs samples have high specific surface area of 138.6 m

关键词： Layered double hydroxides Borate anions intercalation Hierarchical porous nanostructure Precursor method adsorption performance

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Enhanced removal of Congo red by hierarchical porous magnesium borate nanostructures:adsorption performance,kinetics and thermodynamic studies

Enhanced removal of Congo red by hierarchical porous magnesi...

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中国化学会第十九届全国化学热力学和热分析学术会议

作者： Yan-Qing Ma Xiao-Jun Zhao Zhi-Hong Liu School of Chemistry and Chemical Engineering Shaanxi Normal University

The hierarchical porous 7MgO·2BO·7HO(S1) and 3BO·HO(S2) microspheres have been prepared by a phase transformation of chloropinnoite and thermal transformation method respectively,which were characterized by the XRD,FT-IR,TG,EDS and *** microsphere nanostructure is assembled by nanosheets(Fig.1).It has been demonstrated that the as-prepared magnesium borate nanostructures have a porous hierarchical structure with a high specific surface area of 103.62 and 46.10 m/g measured by N adsorption-desorption,*** exhibit excellent adsorption performance with maximum adsorption capacity of 202.84 and 170.07 mg/g for Congo red(CR),***,the obtained data have been evaluated using different models for the adsorption kinetics and thermodynamic studies,which were well fitted with the pseudo-second-order rate equation and Langmuir adsorption *** thermodynamic parameters for the changes of free energy(ΔG),enthalpy(ΔH) and entropy(ΔS) were calculated by using the following equations(Fig.2),which suggest that chemisorption occurs for CR adsorption on magnesium borate *** needs to indicate that the as-prepared hierarchical porous magnesium borate nanostructure are highly promising for organic dyes removal and waste treatment applications.

关键词： Magnesium borate Hierarchical porous nanostructure Phase transformation method adsorption performance Thermodynamic studies

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Simple fabrication of carboxymethyl cellulose and k-carrageenan composite aerogel with efficient performance in removal of fluoroquinolone antibiotics from water

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 105-118页

作者： Na Li Boqiang Gao Ran Yang Hu Yang State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Department of Environmental Science School of Tropical and Laboratory MedicineHainan Medical UniversityHaikou 571199China

3D composite aerogels(CMC-CG)composed of carboxymethyl cellulose andκ-carrageenan were designed and fabricated using the one-pot synthesis *** optimized CMC-CG showed a good mechanical property and a high swelling ratio due to its superior textural properties with a proper chemically cross-linked interpenetrating network ***-CG was utilized for the removal of various fluoroquinolones(FQs)from water and exhibited high adsorption performance because of effective electrostatic attraction and hydrogen bonding ***(CIP),a popular FQ,was used as the *** optimized CMC-CG had a theoretically maximal CIP uptake of approximately 1.271 mmol/g at the pH of *** adsorption capacity of CMC-CG was improved in the presence of some cations,Cu2+and Fe3+ions,at a low concentration through the bridging effect but was reduced at a high *** investigation of adsorption mechanisms,based on the adsorption kinetics,isotherms and thermodynamic study,Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy analyses before and after adsorption,and changes in the adsorption performance of CMC-CG toward two molecular probes,further indicated that electrostatic attraction was the dominant interaction rather than hydrogen bonding in this ***-CG after saturated adsorption of CIP could be easily regenerated using a dilute NaCl aqueous solution and reused ***,the disused aerogel could still be reused as a new adsorbent for effective adsorption of Cu2+***,this study suggested the promising applications of this composite aerogel as an eco-friendly,cost-effective,and recyclable adsorbent for thie efficient removal of FQs from water.

关键词： Composite aerogel of carboxymethy lcellulose andκ-carrageenan Fluoroquinolone antibiotics adsorption performance Coexisting substances adsorption mechanism Reusability

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Synthesis of N,O-rich active site porous polymers and their efficient recovery of Gd(Ⅲ) from solution

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Journal of Rare Earths 2023年第9期41卷 1419-1428,I0006页

作者： Bin Xiao Lijinhong Huang Jiacai Ou Bin Zeng Zhiqiang Zou Xiangrong Zeng Wanfu Huang School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Resources and Architectural Engineering Gannan University of Science and TechnologyGanzhou 341000China Faculty of Science and Engineering WA School of Mines:MineralsEnergy and Chemical EngineeringCurtin UniversityWAAustralia School of Architecture and Design Jiangxi University of Science and TechnologyGanzhou 341000China

Our previous study found that the adsorption performance of porous carbon for Gd(Ⅲ) could be significantly improved by increasing the N,and O functional groups on its ***,the adsorption capacity of porous carbon is low due to the limited number of N,and O functional groups that can be loaded on its *** to the advantage of customizable functional groups of porous organic polymers(POPs),the triazine-based Tb-MEL and hydroxyl-modified triazine-based Tp-MEL were synthesized by a one-step hydrothermal method using nitrogen-rich melamine as the raw material and triformylbenzene(Tb) and 2,4,6-triformylphloroglucinol(Tp),*** Gd(Ⅲ) adsorption isotherms and kinetic curves of Tb-MEL,and Tp-MEL at pH=6 and T=25℃ are in high agreement with the Langmuir isotherm(R^(2)>0.998) and pseudo-second-order kinetics(R^(2)>0.993),*** fitted maximum adsorption capacity(q_(max)) is about 136.05 mg/g,much higher than 58.38 mg/g of *** adsorption efficiency for Gd(Ⅲ) at pH=7 is close to 100%,and Tp-MEL maintains 62.4% of the initial adsorption capacity after ten cycle s of sorption/desorption of Gd(Ⅲ),with an average elution efficiency of more than 90%.adsorption selection performance tests show that Tp-MEL has good adsorption selectivity for HREE ions,and the selectivity is as follows:Lu^(3+)>Y^(3+)>Gd^(3+)>Nd^(3+)>La^(3+)>Al^(3+)>Ca^(2+)>Mg^(2+).Batch adsorption,Brunauer-Emmett-Teller(BET) method,and X-ray photoelectron spectrometer(XPS)tests show that hydroxyl modifications lose the specific surface area of the polymer,and the functional groups contribute more to the adsorption performance than the specific surface area.

关键词： N O functional groups Triazine-based Hydroxyl-modified adsorption performance Rare earths

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adsorption of Protein in the Expanded Bed

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Chinese Journal of Chemical Engineering 2000年第3期8卷 230-235页

作者：胡洪波姚善泾林东强朱自强浙江大学化工系浙江杭州

The influence of operation parameters on the adsorption performance of protein (bovin serum albumin, BSA) in an expanded bed was studied using Streamline diethyl aminoethyl (DEAE). The result of residence time distributions (RTD) and breakthrough curves showed that adsorption performance of the expanded bed could not be improved by increasing the flow velocity at the range from 16ml·min-1 to 26ml·min-1. The increase of protein concentration from 0.5 mg·ml to 2 mg·ml-1 resulted in poor adsorption performance. With increasing temperature from 5℃ to 30℃ and the sedimented bed height from 11.5cm to 22.5cm, the adsorption characteristics in the expanded bed were improved.

关键词： adsorption performance expanded bed residence time distribution breakthrough curve protein

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Core-shell-embedded Mesoporous Silica Capsules for Atmospheric Water Harvesting

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 951-959页

作者： ZHANG Shangsheng XU Shuman LEI Ruicheng PAN Yuliang MA Tao ZHANG Zheng LIU Chunsheng ZHANG Zengzhi China University of Mining and Technology-Beijing School of Mechanical Electronic&Information EngineeringBeijing 10083China

A one-step ultrasonic mechanical method was used to synthesize a kind of atmospheric water harvesting material with high water harvesting performance in a wide relative humidity(RH)range,especially at low RH(RHadsorption and other characterization techniques were used to study the formation process of nano-microspheres.A new mechanism of self-adaptive concentration gradient regulation of silicon migration and recombination core-shell structure was proposed to explain the formation of a cavity in the MSC *** core-shell design can enhance the specific surface area and pore volume while maintaining the monodispersity and mesoporous *** study the water harvesting performance of MSC,solid silica nanoparticles(SSN)and mesoporous silica nanoparticles(MSN)were *** a small atmospheric water collection test(25℃,40%RH),the water vapour adsorption and desorption kinetics of MSC,SSN,MSN and a commercial silica gel(CSG)were compared and *** results show that the MSC with mesoporous channels and core-shell structure can provide about 0.324 gwater/gadsorbent,79%higher than the CSG(0.181 gwater/gadsorbent).It is 25.1%higher than that of 0.259 gwater/gadsorbentof un-hollowed MSN and 980%higher than that of0.03 gwater/gadsorbentof un-hollowed *** material has a large specific surface area and pore volume,simple preparation method and low cost,which provides a feasible idea for realising atmospheric water collection in arid and semi-arid regions.

关键词： mesoporous silica nanocapsules core-shell structure atmospheric water harvesting adsorption performance

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