Publications by authors named "Hongguo Zheng"
Low-molecular-weight (LMW) organic acids are among the most abundant water-soluble organic compounds, but their gas-particle partitioning mechanism remains unclear. In the present study, LMW organic acids were measured using a URG 9000D Ambient Ion Monitor in suburban Shanghai. The average concentrations of formic acid, acetic acid, oxalic acid, and methanesulfonic acid (MSA) in PM were 405 ± 116, 413 ± 11, 475 ± 266, and 161 ± 54 ng m, respectively.
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- * A new ion chromatography method was developed to analyze multiple organic amines simultaneously without complex preparation, using specific conditions to enhance separation efficiency.
- * The method showed excellent accuracy with high linear correlation for the eight tested amines, having low detection limits and good recovery rates, indicating it could reliably be used for analyzing desulfurization solutions.
Boron and silicon are widely distributed in nature; in water, these compounds typically present in the forms of boric acid and silicic acid, respectively. The maximum allowable levels of silicic acid and boric acid in water are stipulated in relevant national and industry standards, such as GB 8538-2022. Quality changes in water, which are of great significance in water-quality evaluations, can be understood in terms of its silicic acid and boric acid contents.
View Article and Find Full Text PDFIn this paper, a high-performance ion exclusion chromatographic (ICE) method was developed and applied for monitoring maleic hydrazide (MH) translocation in complex potato plant tissue and tuber matrices. After middle leaf uptake, most MH was trapped and dissipated in the middle leaf, and the rest was transported to other parts mainly through the phloem. Soil absorption significantly reduced the uptake efficiency of the root system, in which MH was partitioned to dissipate in root protoplasts or transfer through the xylem and persisted in the plant.
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- Fluoroacetic acid, a potent poison for rodent control, can cause severe damage to human nerve and heart tissues, leading to serious health issues like cardiac arrest and respiratory failure upon ingestion.
- A new detection method for fluoroacetic acid in human blood and urine, utilizing accelerated solvent extraction followed by ion chromatography-mass spectrometry (ASE-IC-MS), was developed, alongside comparisons of different pretreatment techniques.
- The study identified optimal chromatographic and mass spectrometry conditions, allowing for effective extraction and reliable quantification of fluoroacetic acid using blood and urine samples processed with specific solvents and filtration methods.
NH3 is an important chemical with a wide range of applications, but its synthesis mainly relies upon the harsh Haber-Bosch process with huge CO2 emission. Electrochemical N2 reduction offers a carbon-neutral process to convert N2 to NH3 under ambient conditions, but it requires efficient and stable catalysts to drive the N2 reduction reaction. Herein, we report that a sulfur dots-graphene nanohybrid acts as a metal-free electrocatalyst for ambient N2-to-NH3 conversion with excellent selectivity.
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- - Electrochemical reduction offers a sustainable approach for efficient nitrogen fixation, requiring effective electrocatalysts to activate nitrogen.
- - A hybrid catalyst made of CrO nanoparticles and reduced graphene oxide (CrO-rGO) significantly improves electrochemical conversion of nitrogen to ammonia under mild conditions, achieving impressive performance metrics.
- - Experimental and theoretical studies were conducted to understand the mechanisms behind the CrO-rGO catalyst's effectiveness, revealing its high ammonia yield and stability in acidic conditions.
Artificial N2 fixation via the Haber-Bosch process requires high temperature and high pressure at the expense of CO2 release. Electrochemical NH3 synthesis is emerging as an environmentally friendly alternative that operates under ambient conditions, calling for electrocatalysts with efficient N2 reduction reaction (NRR) performance. In this paper, we experimentally and theoretically prove that defective TiO2 on Ti mesh (d-TiO2/TM) acts as an electrocatalyst for the NRR.
View Article and Find Full Text PDFObjective: A method for determination of nitrate (NO3(-)) and sulfate (SO4(2-)) in air of residential areas by ion-chromatography (IC) was established.
Methods: The anions in aerosol samples collected with filter member were extracted by ultrasonic leaching and separated on IonPac AS11-HC analytical column and IonPac AG11-HC guard column with 20.0 mmol/L potassium hydroxide eluted at 1.