Jian Guo Song

Preparation and Characterization of Graphene Oxide

Graphene oxide (GO) films with two-dimensional structure were successfully prepared via the modified Hummer method. It is proven that redox method is a promising way to synthesize GO films on a large scale. Comprehensive characterizations of the properties of GO films were conducted. TEM and DFM analyses showed that GO sheets prepared in this study had single and double lamellar layer structure and a thickness of 2~3 nm. X-ray diffraction (XRD) was selected to measure the crystal structure of GO sheet. Fourier-transform infrared spectra analyzer (FT-IR) was used to certify the presence of oxygen-containing functional groups in GO films. The tests of UV-VIS spectrometer and TGA analyzer indicated that GO sheet possessed excellent optical response and outstanding thermal stability. Elemental analyzer (EA) and X-ray photoelectron spectroscope (XPS) analyzed the components synthetic material. Simultaneously, chemical structure of GO sheet was described in this study. Discussion and references for further research on graphene are provided.

Photocatalytic Degradation of Reactive Black-5 Dye with Novel Graphene-Titanium Nanotube Composite

Graphene-titanium nanotube composites with different ratios of graphite oxide were prepared via the hydrothermal method using ascorbic acid as a reducing agent. Properties of materials were characterized by X-ray diffraction, Fourier Transform Infrared Spectroscopy, high resolution transmission electron microscopy and UV–vis diffuse reflectance spectroscopy. The average diameter of the titanium dioxide nanotubes was about 8 nm. The photoresponse of nanocomposites have been extended to visible-light regions. In addition, graphene-titanium nanotube composites showed higher photocatalytic degradation efficiency for reactive black 5 (RBK5) than pure titanium dioxide and the 15%graphene-titanium nanotube composites catalysts possessed the best photocatalytic activity. The degradation efficiency for RBK5 dyes increased with increased dosage of graphite oxide from 3%-15% and decreased with increasing initial RBK5 concentration. This paper not only reports the fabrication of highly active photocatalysts but also provides insight into the photocatalytic mechanism of graphene-titanium nanotube composites.

Study on Leaching Manganese from Low-Grade Manganese Ores Using Different Reductants

This study discussed the effects on leaching rate of from low-grade manganese ore using three reductants (Hydrogen peroxide, Glucose, Cellulose). The results showed: great increase of extracting rate can be obtained in the process of leaching by adding a small amount of reductant. the leaching rate of two valence manganese can reach a maximum of 90.76%, using hydrogen peroxide as the reductant.

Leaching of Low-Grade Manganese Ores by Using Two Compound Reductants

Under acid leaching conditions, studies was discussed that the impacts of reductant type and amount on leaching rate of manganese by using three groups of glucose - hydrogen peroxide, cellulose - hydrogen peroxide and glucose - cellulose as composite reductants. The results indicate that compound reductant is able to improve the leaching rate of manganese easily. With the optimal reductant group, leaching rate of manganese can be more than 97%.

Preliminary Study on Leaching Mechanism of Manganese Using Ternary Compound Reductant

In this paper, the study of leaching mechanism from low-grade manganese ores by using ternary complex reductant of hydrogen peroxide, glucose and cellulose was discussed. Quantitative and qualitative analysis were conducted about original manganese and manganese slag by XRD and FTIR. XRD quantitative analysis showed that manganese content in manganese ore is about 11%; The FTIR spectra qualitatively analyzed that part broken of the C=C bond in the manganese samples leads to divalent manganese be released.

Effects of Meteorological Factors on PM10 Pollution in Yantai Urban Areas

This paper makes analysis and statistics about the frequency distribution of average temperature, pressure, humidity and wind conditions between moderate pollution days of PM10(API>200) and conventional days from 2008 to 2010 in Yantai. The result shows that the frequency of PM10 pollution which occurred in winter is close to the sum of the other seasons. PM10 pollution days appears easily under such conditions: the average temperature below 10°C, average air pressure is higher than 101.0kPa, relative humidity is less than 70%, or average weed speed of 3-7m/s with the north-south wind.

Research on Temporal and Spatial Distribution of PM10 in Yantai Urban Areas from 2006 to 2010

The purpose of this thesis is to study the characteristics of PM10 concentrations in the atmosphere over time granularity and spatial distribution in Yantai city. The concentration of PM10 is investigated in the daily from 2006 to 2010. The result shows that the characteristics of PM10 concentration in each time granularity are different: the interannual variation can be divided into two stages and the highest is approximately equal twice times of the lowest. The seasonal changes is distinct and the PM10 average concentration presents a feature that spring > winter > autumn > summer. And the highest month of PM10 is April, followed in March and May. The geographical distribution of PM10 is the center of pollution has been located in region A. Each region getting lowest in summer and the minimum one is region H where the concentration is 0.052mg/m3. The function regions can be divided into two categories: most regions show same as the seasonal changes but the region A and G’s characteristics change dramatically and the concentration of PM10 has come to 0.156 mg/m3 in the winter.

Study on Extracting Potassium from Potassium Feldspar with Molten Salt Leaching Method

This article aims to study the technology of extracting potassium from potassium feldspar with molten salt leaching method and to analyze the effects of temperature, reaction time and other factors on extracting potassium, concluding the optimal process conditions of extracting potassium with molten leaching method from potash feldspar.

Study on Technology of Extracting Potassium with Alkaline Hydrothermal Method

In this thesis, potassium feldspar - NaOH reaction system under hydrothermal conditions was established. The aims of this research were to discuss comprehensively the factors affecting potassium dissolution rate of the system. The experimental result indicated: effect on the extracting rate of potassium, NaOH concentration > the reaction temperature > reaction time; The rate of extracting potassium can be up to 70% under the optimal conditions; XRD phase analysis of ore and slag filtering showed that NaOH additive destroyed the crystal structure of potassium feldspar, and formed a new phase.

Distribution of SO2 and the Meteorological Factors in Yantai Urban Areas from 2008 to 2010

The purpose is to study the temporal and spatial distribution features of SO2 and its relationship with impact factors such as wind, humidity and precipitation in urban areas of Yantai. The results demonstrate that the emission of SO2 had been capable controlled from 2008 to 2010. The meteorological conditions also take the key part in spread of SO2, wind and precipitation are the main factors affecting of it in Yantai. Concentrations change significantly with seasons, which remain low in vast majority of periods. Contamination is generally concentrated in the range of major pollution sources within 7 kilometers. And it implies that after the reduction of SO2 pollutant concentrations, the planning and adjustment of industrial areas and residential areas still need to be paid attention.