Self-made Device Research Articles

Dynamic indentation and microstructural analysis of artery under pre-strain in different directions

Strain from mechanical overload is a critical factor in vascular wall rupture associated with vascular diseases. Therefore, investigating the mechanical properties of blood vessels under strain is essential. Previous studies have predominantly focused on strain-free tests, and lacking microstructural analysis under load conditions. In this study, a self-made indentation device was used to combine with a pre-strain apparatus. Dynamic indentation tests were conducted on porcine arteries under pre-strain. Hematoxylin & Eosin staining and Masson staining were employed to observe microstructural changes in the arteries under strain. The results indicate that under pre-strain, the shear modulus of the arteries is positively correlated with the strain ratio. Radial strain increase the arterial relaxation ratio, while axial strain decrease it. Pre-strain enhance the arterial storage and loss modulus, which peaks at resonance frequencies of approximately 0.04 Hz and 1 Hz. Under pre-strain, elastic fibers experience a decrease in axial diameter and a reduction in spacing. The distribution of collagen is abnormal under radial strain. In the design of artery stents, a rationally designed stent structure should be considered so that the localized strain of the vessel wall is more decomposed into the axial direction.

Oxygen-vacancy-rich CeO2/LaFeO3 for peroxymonosulfate activation: Singlet oxygen as the main active oxygen to degrade organic pollutants in high-salinity environments

Due to the quenching effect of typical anions on free radicals, free radical based advanced oxidation processes have always been difficult to effectively treat high-salinity organic wastewater. In this work, an oxygen-vacancy-rich ceria-perovskite composite (CeO2/LaFeO3) was successfully prepared, and the oxygen vacancy became the active sites for activating peroxomonosulfate to produce a large amount of singlet oxygen (1O2) as the main reactive oxygen species (ROS) for tetracycline degradation in high-salinity organic wastewater. In the typical high-salinity environments (30000–70000 mg·L−1, NaCl, Na2SO4, NaNO3, Na2CO3, NaH2PO4, or NaBr), CeO2/LaFeO3 can achieve more than 95 % removal of TC within 40 min, and the 40 min removal rate of TC in a variety of mixed salt environments is also maintained above 94 %. Common cations (K+, Fe3+, Mn2+, Ca2+, Mg2+, Cu2+, and Ba2+) were also not found to have a significant negative effect on TC removal. CeO2/LaFeO3 can completely remove TC within 40 min in 5 cycles, the granular CeO2/LaFeO3 immobilized in a self-made small device can also achieve continuous removal of more than 96.6 % of TC within 420 min. The results of pea seed germination test showed that CeO2/LaFeO3 as catalyst for heterogeneous water treatment would not bring additional environmental risks.

Commentary on "The Safety and Effectiveness of a Self-Made Negative Pressure Suction Device in the Treatment of Chronic Wounds".

Commentary on "The Safety and Effectiveness of a Self-Made Negative Pressure Suction Device in the Treatment of Chronic Wounds".

Oil storage and debrining process in insoluble sediment voids for underground salt cavern energy storage: An experimental study

Large salt cavern oil storage is an effective underground oil storage method, which has been widely used in the United States, Germany, and France. However, the insoluble impurity sediment particles at the bottom of the salt cavern will occupy plenty of oil storage space. To enhance the oil storage capacity, the sediment void oil storage (SVOS) method was proposed. The debrining process from the sediment void prerequisite of the SVOS. It will affect the feasibility of oil injection into the sediment void and the operation efficiency of SVOS. Thus, a self-made debrining device of SVOS was built, and the dynamic debrining process in the sediment void was investigated to explore the debrining process from the sediment void. Six debrining parameters (oil-brine interface change, oil injection rate, brine discharge rate, oil viscosity, the second oil injection quantity, and ground temperature) were proposed and considered. Two kinds of oils (diesel and petrolatum) were conducted in the SVOS debrining experiments. The experimental results showed that the debrining rate remained stable, and it was relevant to the oil injection rate and the interaction of oil and sediments. The average debrining rate of the initial diesel debrining, second diesel debrining, and petrolatum debrining were 2.5 g/s, 2.55 g/s and 2.40 g/s, respectively. The 50 °C of ground temperature sped the debrining rate of high-viscosity oil storage in the sediment void. The oil-brine interface kept balance from the macro perspective, and the oil did not penetrate the inner brine. The oil-brine interface drops ratio of the initial diesel debrining, second diesel debrining, and petrolatum debrining process were 0.586 mm/s, 0.629 mm/s and 0.592 mm/s, respectively. The oil in the sediment voids generated movable and immobile bubbles. The petrolatum flow in the sediment void was easier than the diesel due to the low viscosity at 50 °C. The research has a certain reference value for the development of underground salt cavern oil storage.

Headspace separation combined fluorescence detection of hydrogen sulfide with silver-sensitized lanthanide coordination polymer via a simple self-made device

Hydrogen sulfide (H2S), playing unique role on signal transmission in various physiological processes, the rapid and accurate monitoring of it is particularly concerned. The drawbacks of fluorescence probe for H2S, namely poor selectivity or long response time, have always existed. As a test case, here headspace separation combined fluorescence strategy was attempted, on basis of H2S stimuli-responsive AMP/Tb3+/Ag+ or GMP/Tb3+/Ag+ coordination polymer probes. The fluorescence intensity of them is inversely proportional to the concentration of it, due to Ag-S in situ coordination and partial formation of Ag2S. Using the hybrid analysis, a quick response of less than 2.0 min and a high selectivity could be obtained. The signal change (ΔI) of AMP/Tb3+/Ag+ or GMP/Tb3+/Ag+ showed good linearity within the range of 0.5–100 μM and 1.0–150 μM, along with a detection limit (3σ) of 0.2 and 0.4 μM, respectively. When utilized to determine the sulfide level in real samples, it shows recoveries from 96.4 % to 102.3 % with relative standard derivation (RSD) less than 3.0 %. The combination strategy of headspace separation and fluorescence quantitative analysis was verified to effectively eliminate potential interference such as other coexisting non-volatile thiol-containing species, providing a novel avenue to flexibly design the volatile component analysis with high selectivity in complex sample matrixes.

Efficacy of a self-made tracheostomy oxygen delivery device for oxygen therapy during postoperative anesthesia recovery

BACKGROUND: Patients with tracheotomy are often monitored in the anesthesia recovery room after reoperation. During this period, oxygen therapy is necessary, and the existing tracheostomy oxygen supply device has many defects. OBJECTIVE: To evaluate the efficacy of a self-made tracheostomy oxygen delivery device on oxygen therapy during postoperative anesthesia recovery. METHODS: Patients were randomly divided into two groups, E and C, with 30 patients in each group, and admitted to the post-anesthesia care unit (PACU). Patients in group E received oxygen through a self-made tracheostomy oxygen delivery device, while patients in group C were supplied oxygen through a unilateral nasal cannula. Respiration (R), pulse oximetry (SpO2), and the number of patients on ventilators were recorded at the time of admission (T0) and one hour after admission (T1). Rapid dry blood gas analyses were performed on 0.6 ml samples of arterial blood collected at T0 and T1. RESULTS: Compared to group C, patients in group E had significantly higher arterial partial pressure of oxygen (PaO2), arterial oxygen saturation (SaO2), total carbon dioxide (T-CO2), and actual bicarbonate (AB), while arterial partial pressure of carbon dioxide (PaCO2) was significantly reduced (P< 0.01 or < 0.05). Compared to T0, PaO2 decreased in both groups at T1, PaCO2 decreased in group E, while SaO2, T-CO2, and AB decreased in group C (P< 0.01 or < 0.05). CONCLUSION: We found that using the self-made tracheostomy oxygen delivery device in postoperative anesthesia recovery had advantages such as a secure connection to the tracheostoma, adjustable oxygen concentration, air filtration, and the ability to switch oxygen supply between the ventilator and humidifier.

Delving into the role of microwave curing on the strength and cement hydration features of cemented tailings backfill

Cemented tailings backfill (CTB) comprises tailings, binders, and water and is filled into goaves to regulate the ground pressure and ensure production safety. Thus, shortening the curing time of CTB has been a popular research topic in backfill mining as it maximizes the extraction of the neighboring stopes while lowering mining-related costs. In this study, a self-made horn microwave experimental device was developed to rapidly enhance CTB’s strength property. Subsequently, the microwave-curing effects on the upper surface temperature, strength, deformation coefficient, and hydration reaction of CTB were explored through uniaxial compressive strength, X-ray diffraction, and thermogravimetric/differential thermogravimetric experiments. Experimental marks revealed that the strength property of early-aged (up to 7 d) CTB composites could be rapidly enhanced by microwave curing, except for the 7-d-cured fills with microwave curing times of 5–7 min. Moreover, the hydration reactions of CTB after 3- and 7-d curing were substantially accelerated by microwave curing. Thus, this study offers a novel method of satisfactorily increasing early-aged CTB strength and exploring its hydration mechanisms effectively.

In situ noninvasive monitoring of cell secretions based on MOFs/AAO hybrid membrane induced asymmetric ion transport

Nanofluidic hybrid membranes display distinct ionic current rectification (ICR) properties and provide high surface area for immobilizing probes on the outer surface, exhibiting great potential in detection of biomolecules. Herein, we fabricated MOFs/AAO hybrid membrane with aptamers functionalized on the outer surface for in situ detection of living cells released secretions. TNF-α (a small molecular protein secreted by macrophages) was used as a model. After TNF-α was specifically captured by aptamers on the membrane surface, the asymmetry of surface charge on the hybrid membrane was amplified, the ICR was increased from 3.89 to 18.85. According to the ICR change, TNF-α was sensitively measured with a detection limit of ∼0.49 pM, which was significantly lower than other reported methods. When the hybrid membrane was clamped in the middle of self-made device, PET membrane incubated macrophages was rolled up and inserted into the chamber to mimic cellular microenvironment. Macrophages released TNF-α could be real time monitored with ionic current, macrophages and normal cells could be effectively distinguished according to the released TNF-α level. Thus, we proposed a nanofluidic platform for accurately measuring cell secretions in an engineered cellular microenvironment with a direct manner, without the need for labels or amplification steps.

The Key Phytochemical Cue Camphor Is a Promising Lure for Traps Monitoring the New Monophagous Camphor Tree Borer Pagiophloeus tsushimanus (Coleoptera: Curculionidae).

The landscape plant, Cinnamomum camphora, is a broad-spectrum insect-repelling tree species, mainly due to a diversity of terpenoids, such as camphor. Despite its formidable chemical defenses, C. camphora is easily attacked and invaded by a monophagous weevil pest, Pagiophloeus tsushimanus. Deciphering the key olfactory signal components regulating host preference could facilitate monitoring and control strategies for this pest. Herein, two host volatiles, camphor and ocimene, induced GC-EAD/EAG reactions in both male and female adult antennae. Correspondingly, Y-tube olfactometer assays showed that the two compounds were attractive to both male and female adults. In field assays, a self-made trap device baited with 5mg dose d(+)-camphor captured significantly more P. tsushimanus adults than isopropanol solvent controls without sexual bias. The trunk gluing trap device baited with bait can capture adults, but the number was significantly less than that of the self-made trap device and adults often fell after struggling. The cross baffle trap device never trapped adults. Neither ocimene nor isopropanol solvent control captured adults. When used in combination, ocimene did not enhance the attraction of d(+)-camphor to both female and male adults. These results indicate that d(+)-camphor is a key active compound of P. tsushimanus adults for host location. The combination of the host-volatile lure based on d(+)-camphor and the self-made trapping device is promising to monitor and provide an eco-friendly control strategy for this novel pest P. tsushimanus in C. camphora plantations.

Fishing for a button battery using a self-made magnetic device.

Fishing for a button battery using a self-made magnetic device.

Prolonged joint cavity retention of tranexamic acid achieved by a solid-in-oil-in-gel system: A preliminary study

Tranexamic acid (TXA) is an anti-fibrinolysis agent widely used in postoperative blood loss management. As a highly water-soluble drug, TXA is suffering from rapid clearance from the action site, therefore, large amount of drug is required when administered either by intravenously or topically. In this study, a TXA preparation with prolonged action site residence was designed using the nano-micro strategy. TXA nanoparticles were dispersed in oil by emulsification followed by lyophilization to give a solid-in-oil suspension, which was used as the oil phase for the preparation of TXA-loaded solid-in-oil-in-water (TXA@S/O/W) system. The particle size of TXA in oil was 207.4 ± 13.50 nm, and the particle size of TXA@S/O/W was 40.5 μm. The emulsion-in-gel system (TXA@S/O/G) was prepared by dispersing TXA@S/O/W in water solution of PLGA-b-PEG-b-PLGA (PPP). And its gelling temperature was determined to be 26.6 ℃ by a rheometer. Sustained drug release was achieved by TXA@S/O/G with 72.85 ± 7.52 % of TXA released at 120 h. Formulation retention at the joint cavity was studied by live imaging, and the fluorescent signals dropped gradually during one week. Drug escape from the injection site via drainage and absorption was investigated by a self-made device and plasma TXA concentration determination, respectively. TXA@S/O/G showed the least drug drainage during test, while more than 70 % of drug was drained in TXA@S/O/W group and TXA solution group. Besides, low yet steady plasma TXA concentration (less than 400 ng/mL) was found after injecting TXA@S/O/G into rat knees at a dosage of 2.5 mg/kg, which was much lower than those of TXA dissolved in PPP gel or TXA solution. In conclusion, sustained drug release as well as prolonged action site retention were simultaneously achieved by the designed TXA@S/O/G system. More importantly, due to the steady plasma concentration, this strategy could be further applied to other highly water-soluble drugs with needs on sustained plasma exposure.

Study on adsorption and purification materials for ethylene in cold storage

In view of the lack of systematic quantitative and comparative studies on the purification effect of ethylene adsorbent in cold storage, starting from the selection of purification materials, this paper analyzed the purification effect of different zeolite materials on ethylene through a small test chamber, and screened out the best zeolite adsorbents used in self-made purification device. Combined with characterization analysis, purification efficiency evaluation and adsorption capacity of zeolite material, the removal performance of ethylene was investigated. The results showed that the zeolite samples with rough and porous surface showed better adsorption performance for ethylene. The larger the specific surface area and total pore volume, the stronger the adsorption capacity to ethylene. In addition, the presence of Na elements and mesoporous increased the exchange capacity and pore volume, which also played a certain role in the ethylene adsorption process. Experimental result demonstrates that clean air volume (CADR) of ethylene is 232 m3/h, the ethylene removal rate at 30 min is 98.19%, and the purification energy efficiency is 1.39. At the same time, the adsorption capacity of the selected zeolite sample is 1380.5 μg/g by dynamic adsorption experiment, and the service life of the filter element of the self-made purification device is estimated to be 166 days. This study can provide a theoretical basis for ethylene purification in cold storage.

Cosolvents effect on supercritical CO2 microemulsion containing ionic Liquid: Experiment and simulation

Supercritical carbon dioxide (scCO2) microemulsion containing ionic liquids (ILs) 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) were prepared under mild operating conditions with the help of surfactant branched secondary alcohol ethoxylates (TMN-6) and cosolvents (water and ethanol). Phase equilibrium experiments and molecular dynamics (MD) simulations were conducted from gas-phase system, two-phase system to supercritical system. The conditions of constructing supercritical microemulsion were studied by using self-made phase equilibrium device. The effects of temperature, surfactant concentration, and cosolvent concentration on cloud point pressure (CPP) were studied. The results showed that the transparent and uniform microemulsion could not be formed in gas-phase and two-phase systems. In supercritical system, the proper addition of cosolvent water and ethanol contributed to the formation of microemulsion and the dissolution of ILs. However, the reduction effect of CPP was not obvious or even increased when only water was added. After added water and ethanol simultaneously, not only did the maximum WIL increase to 0.26, but CPP also significantly decreased. MD simulation was conducted to characterize the microstructure of three systems. Furthermore, the gyration radius, radial distribution function (RDF), and hydrogen bond dynamics were calculated to analyze the strengthening mechanism of cosolvents on self-assembly. The simulation results revealed that, water promoted the interaction between hydrophilic groups of surfactants and ionic liquids, while ethanol constructed a hydrogen bonding network between continuous and dispersed phases. Water and ethanol have synergistic effect on the preparation of supercritical microemulsion, which has a good effect on improving the self-assembly rate and aggregate stability.

Electric-field enhanced three-dimensional flexible carbon felt as a host for Pt4+ ions extraction

The extraction of the precious metal Pt4+ ions from aqueous solution are of great importance for both economic development and environmental protection. In this study, an electric field assisted adsorption process with high efficiency and recyclability was explored in a self-made device using three-dimensional (3D) flexible carbon felt (FCF) as the adsorbent without using conductive adhesive. Under the aid of an electric field (0.4 V), 3D pristine FCF (p-FCF) showed a considerable adsorption capacity for Pt4+ (82 mg/g). As high as 203 mg/g was obtained when o-NFCF adsorbents modified with N doping and surface oxygen-containing groups was used. Kinetic and thermodynamic studies show that the electric field would enhance the interactions between the adsorbent and Pt4+ ions, and improve the intraparticle diffusions. Mechanism study showed that the synergistic effect between N doping and oxygen-containing groups might efficiently tune the electrochemical properties of 3D FCF materials, which significantly contributed to the enhanced adsorption of Pt4+. The electroadsorption technology developed in this study provides a simple and efficient method for industrial recovery of precious metal ions.

The Biogas Production Potential and Community Structure Characteristics of the Co-Digestion of Dairy Manure and Tomato Residues

Anaerobic digestion is an important means to turn agricultural waste into resources and an important way to address the challenges in treating vegetable residues in China. In this study, the co-digestion of dairy manure with tomato residue was investigated to clarify the effect of the total solids (TS) of the digestion substrate on methane’s production and mechanism using the self-made anaerobic digestion device. The results showed that all treatments could rapidly ferment methane and that the daily methane production showed a trend of increasing first and then decreasing. The optimal concentrations of the digestion substrate for liquid anaerobic digestion (L-AD), hemi-solid-state anaerobic digestion (HSS-AD), and solid-state anaerobic digestion (SS-AD) were 10%, 18%, and 25%, respectively. Compared with SS-AD and HSS-AD, L-AD gas production peaked 3–6 days earlier. Treatment TS25 had the best cumulative methane production, reaching 117.4 mL/g VS. However, treatment TS6 had acid accumulation and a very unstable system. The cumulative methane production of SS-AD was higher than that of HSS-AD and L-AD. Firmicutes and Bacteroidetes were the dominant flora, and Methanoculleus, Methanosarcina, and Methanobrevibacter were the main archaeal groups. The TS significantly changed the microbial community composition of the digestion system, especially the low TS treatment. The results presented herein indicated that TS significantly changed the bacterial and archaeal community composition of the digestion system, and thus with the increase in TS from 6% to 25%, the methane yield increased.

Experimental Study on the Effect of Wetting-Drying Cycles on Crack Development and Radon Retardation of the Covering Soil in Uranium Mill Tailing Impoundments.

The majority of uranium mill tailing impoundments in the southern part of China are located in humid subtropical regions where persistent rainfall and rapid evaporation of water after rain often occur. Under the prolonged influence of alternating wet and dry conditions, the covering soil layer of uranium mill tailing impoundments develops cracks, leading to the issue of degradation or even failure of the radon retardation effect. A beach surface of uranium mill tailing impoundments in the southern part of China is selected as the research object. Through use of a self-made simulation test device, a degradation experiment of uranium mill tailing covering soil models under wetting-drying cycles was conducted indoors. The experimental results indicate that with a constant amplitude of wetting-drying cycles, microcracks characterized by a narrow width and high abundance were mainly generated in the early-to-mid-stage of wetting-drying cycles. The main cracks, characterized by their wide width and less abundance, were mainly formed in the mid-to-late stage of wetting-drying cycles. After seven wetting-drying cycles, the total length of cracks showed a "stair-step" increase and the surface crack ratio exhibited a trend of moving from rapid growth to stable growth and then to a slight decline. The cumulative damage degree showed a rapid increase to stable growth with an increase in the number of wetting-drying cycles. Grey relational analysis revealed that, compared to other surface crack indicators, radon exhalation rate was the most closely correlated with the surface crack ratio. With a constant amplitude of wetting-drying cycles, the radon exhalation rate underwent four stages as the number of wetting-drying cycles increased: stage I witnessed a rapid increase, stage II witnessed a rapid decrease, stage III witnessed a gradual increase, and stage IV witnessed a stable or even slight decrease. With a constant number of wetting-drying cycles, the radon exhalation rate correspondingly increased with the amplitude of wetting-drying cycles, particularly noticeable when the alternation amplitude was 30 ± 20%. From the early mid-stage to the late stage of wetting-drying cycles, the curves of the radon exhalation rate, surface crack ratio, and cumulative damage degree tended to be consistent, showing a gradual increase. The research provided in this study offers valuable insights into radon control measures and environmental assessments on the beach surface of uranium mill tailing impoundments.

Experimental and mechanism study of asphaltene on formation and stabilization of oil-based foam

Stable foam will be generated in the separation equipment after pressure reduction of crude oil, which reduce the separation efficiency and damage the power equipment. It is found that the foam formed by asphaltene-rich crude oil is particularly stable in oilfield production, and the action mechanism of asphaltene for foam remains unclear. Hence, a self-made foaming device was performed to investigate the foamability and foam stability of oil-based foam, and the impact of asphaltene concentration and oil phase composition on foam properties was elucidated from the interfacial properties, viscosity, foam structure and the microstructure of asphaltene. Results show that low asphaltene concentrations promote foaming and mitigate the foam destruction. In contrast, high asphaltene concentrations are detrimental to foaming and reduce foam stability. The changes in interfacial properties and viscosity caused by asphaltene are not the main factors affecting foam performance. Besides, we proposed that asphaltene present in the oil phase as non-adsorbed particle, and the foam stability is influenced by the shape, volume fraction and size distribution of the particles. Furthermore, the boundary conditions for the effect of asphaltene on foam performance are innovatively put forward. This work contributes to understand the mechanism by which the asphaltene enhances foam stability and provides theoretical support for defoaming techniques in crude oil foam.

Modification of Copper Benzene-1,3,5-tricarboxy Late (Cu-BTC) Composites with Multiwalled Carbon Nanotubes and Amino Groups for Enhanced CO2/CH4 Selective Adsorption Performance and Water Stability

CNT-NH2-Cu-BTC was prepared via hydrothermal synthesis for the adsorption and separation of CO2/CH4 mixtures with 2, 6, and 10% multiwalled carbon nanotube (MWCNT) additions. NH2-BTC composites were synthesized by changing the organic ligand and adding NH2-BDC (15, 25, 35, and 45%) to improve the adsorption capacity. MWCNTS were loaded to enhance the water stability of the material. The structure, surface morphology, and pore size distribution of the composites were characterized using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and specific surface area and pore structure measurements. The CO2/CH4 selective adsorption performance was studied via breakthrough experiments using a self-made adsorption device. The CO2 adsorption capacity of Cu-BTC increased due to the addition of NH2-BDC, with 35%NH2-Cu-BTC exhibiting the best CO2 adsorption property, i.e., a CO2 adsorption capacity of 1.82 mmol/g and a CO2/CH4 separation coefficient of 1.44 at 35 °C and 20 mL/min. After adding MWCNTs, 6%CNT-NH2-Cu-BTC exhibited the best CO2 adsorption property and water stability, with the CO2 adsorption capacity increasing to 2.06 mmol/g. 6%CNT-NH2-Cu-BTC with wet impregnation retained 79% of the CO2 adsorption capacity of the sample without wet impregnation, demonstrating its excellent water stability under humid conditions. Cyclic experiments with and without wet impregnation were performed.

Multifunctional composite materials of rGO with RAFT initiated polymers with terminal amine or protonated amine functionalities for chemical eliminations HCHO and acidic pollutants at ambient conditions

In this paper, the contribution of self-assembled composite material of bifunctional polymer prepared by RAFT polymerization and rGO to the removal of low concentration HCHO and acids from air were systematically studied. Experimental results demonstrate that the condensation reaction between HCHO and the protonated amino group at the terminal of the rGO-py-pAMHS-NH3+-ph chain effectively can eliminate HCHO chemically, resulting in the release of H2O as the sole by-product following oxime bonds formation. rGO alone is incapable of chemically removing gaseous HCHO, but when combined with the py-pAMHS-NH3+-ph, efficient HCHO conversion can be achieved, well elucidating the remarkable HCHO removal capability via rGO-py-pAMHS-NH3+-ph. The HCHO chemical removal performance of composite is evaluated by a self-made device at the 1000 mL/min N2 velocity under 25 °C and 50 % RH and it is found that 206.41 mg of HCHO can be removed in approximately 4 h by using 1.0 g of rGO-py-pAMHS-NH3+-ph. In addition, cycling experiments demonstrate the rGO-py-pAMHS-NH3+-ph possesses good durability. We also find that the rGO-py-pAMHS-NH2-ph has the ability to remove acids when the terminal protonated amino groups have been converted into amine functionalities. This green and zero-carbon emission methodology for chemical removal of HCHO degradation and acid pollutants could provide valuable reference for developing other efficient strategies to remove other pollutants such as VOCs etc.

Research on self-made zinc ion microfluidic chip detection system based on all solid state ion selective electrodetrode

This paper first prepared and characterized an all solid zinc ion selective electrode using electrode deposition, and further established a microfluidic chip system integrating zinc ion ASS-ISE and a self-made potential detection device. The stability of the self-made potential detection device was verified by comparing it with traditional electrochemical workstations. The accuracy of the microfluidic chip detection system was verified through comparative testing with traditional atomic absorption spectrophotometry (AAS). The experimental results show that the accuracy and stability of the microfluidic chip system integrated with ASS-ISE and self-made potential detection device meet the requirements of on-site rapid detection.