Guang Hua Wang

Preparation and Adsorbability for Orange II of CTAB Modified Bentonite

Surfactant modified bentonite was prepared using cetyltrimethylammonium bromide (CTAB) by a simple ion exchange method, and the organification of bentonite was proved by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron micrographic (SEM). The adsorption of Orange II(OII) dye onto CTAB modified bentonite was carried out. Compared with natural bentonite, the adsorption capacity of CTAB-Bent for OII was greatly enhanced. The adsorption isotherm of OII was in good agreement with the Langmuir equation.

The Flocculating Properties of Cationic-Starch-Graft-Polyacrylamide and its Nano Magnetic Modified Product

A series of Cationic-Starch-graft-Polyacrylamide (CP) copolymers have been synthesized in salt solution system under microwave radiation and modified by Nano magnetic Fe3O4 (NMCP). The two products were prepared as flocculants for coking wastewater treatment. The impact of CP dosage, NMCP dosage, PFS dosage, CTAB dosage and pH on flocculating effects was investigated. The result indicated that CP and NMCP could obviously improve flocculation performance without adjusting pH of wastewater. The optimal conditions were CP dosage 3 mg/L, NMCP dosage 20 mg/L, PFS dosage 1.2 g/L, CTAB dosage 60 mg/L. Under such circumstances, the removal rates of turbidity (NTU), chemical oxygen demand (CODCr) and colortity were 95.24%, 57.69% and 89.06%, respectively.

Synthesis of Magnetic Modified Organobentonite as Adsorbent for Degradation of Orange II

Magnetic modified organobentonite (Fe3O4/CTAB–Bent) was synthesized by chemical co-precipitation method in which CTAB–Bent was firstly achieved via ion–exchange.The composite materials have been characterized by powder X–ray diffraction (XRD), Fourier transform infrared spectroscopy (FT–IR) and Scanning electron microscopy (SEM) . The results revealed that basal spacing of bentonite was increased through organic modification and the Fe3O4 particles synthesized which covering the surfaces of bentonite .Compared with natural bentonite, the adsorption capacity of Fe3O4/CTAB–Bent for Orange II was greatly enhanced and can be easily separated from the reaction medium by an external magnetic field after the treatment.

Synthesis and Catalysis of Fe3O4 Nanoparticles for Degradation of Rhodamine B

Fe3O4 nanoparticles (Fe3O4 NPs) were successfully prepared via chemical co-precipitation method under the assistance of ultrasound irradiation and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). a series of experiments were carried out to investigate the degradation of Rhodamine B(RhB) by the obtained heterogeneous Fe3O4 catalysts in the presence of H2O2. The effects of catalyst loading,initial pH, reaction temperature, oxidant concentration were discussed. The result indicated that the optimal conditions were Fe3O4 NPs dosage 0.7 g/L, initial pH=3.0, reaction temperature 60°C, oxidant concentration 20 mmol /L.

Synthesis and Catalytic Performance of Al-Pillared Clays Supported Fe3O4 Nanoparticles

Al-pillared bentonite supported Fe3O4 nanoparticles were prepared by co-precipitation and characterized with X-ray diffraction (XRD), specific surface area (BET) and scanning electron microscopy (SEM). The supported Fe3O4 nanoparticles exist on the surface of clays, with better dispersing and no obvious aggregation than the ones without bentonite support. Batch tests were carried out to investigate the catalytic oxidation Orange II by the obtained heterogeneous catalysts. The effect of pH, temperature and initial H2O2 concentration on degradation was discussed, and the regeneration ability of catalyst was also studied.

Microwave-Assisted Synthesis of Corn Starch-Graft-Poly(AM-DADMAC)

Under conditions of microwave radiation (MW) and open-vessel reflux, acrylamide (AM) and diallyldimethylammonium chloride (DADMAC) were grafted to corn starch (St) by aqueous solution polymerization in air atmosphere. Continuous MW in conjunction with potassium persulfate (KPS) were utilized to initiate the above graft reaction. A representative copolymer of St-graft-poly(AM-DADMAC) was characterized by Fourier transform infrared spectroscopy, elemental analysis, scanning electron microscopy and energy disperse spectroscopy. Microwave power, radiation time, KPS concentration and AM/DADMAC molar ratio were investigated to examine their effects on grafting efficiency (GE) and cationic degree (CD). The optimal conditions under investigation were microwave power 500 W, radiation time 150 s, KPS concentration 2 mmol·L–1, AM/DADMAC molar ratio 9∶1. The GE and CD obtained were 68.6% and 0.16 mmol·g–1, respectively.

A Study on Advanced Treatment for Coking Wastewater with Biological Activated Carbon Based on Efficient Degrading Flora

The removal efficiency of degrading flora which has been constructed is investigated in biological carbon process through the variation of COD and chromaticity. The results show that the efficient degrading strains can reproduce on the activated carbon quickly；the biological activated carbon reactor，in which degrading flora to coking waste water are inoculated，is adopted to carry out the treatment of wastewater，in such a way the COD and chromaticity in outflow water can remain at a lower level (with COD about 50mg/L and chromaticity about 50 degree). The average COD removal rate is 71% and the chromaticity removal ratio is 95%.

Characterization of HAFPAM and its Application in Wastewater Regeneration Treatment with OTAB

The inorganic-organic hybrid polymer HAFPAM was characterized by Fourier transform infrared spectroscopy (FTIR) and Elemental analysis. Its application with the synergistic effect of OTAB in coking wastewater regeneration treatment was also investigated. The results showed that PAFC was grafted onto CPAM chains through coordinate bonds due to hydroxyl crosslinking. The CODCr and chroma removal rates can reach 59.09% and 87.5% when the dose of OTAB is 50 mg/L, and Subscript textthe effluent can meet the quality standard of reclaimed water. SEM analysis showed OTAB can improve the sedimentation process.

Synthesis of Starch-Graft-Polyacrylamide by Salt Solution Media Polymerization

Starch-graft-polyacrylamide (St-g-PAM) was prepared using a salt media polymerization technique, and characterized by FITR. The type of starch and the synthesis method of different system were studied through the mass of product, the percentage of grafting (PG) and the monomer conversion (MC), and the difference polymerization system. The results showed that the pretreated starch and the salt solution system, respectively, were more advantageous than the raw starch and the aqueous solution system. The intrinsic viscosity, transmittance, product loss, penetration and apparent viscosity of St-g-PAM by salt solution polymerization were 12.49 dL•g-1, 18.6%, 0.56%, 53.96, 18.40 Pa•S, respectively. The method could get bigger branched-chain molecular than the others with high yield, high monomer conversion, high the percentage of grafting, low product losses and easy post-processing

Synthesis and Characterization of Hybrid Polymer PAFC–CPAM

The inorganic-organic hybrid polymer PAFC–CPAM with 100∶1 (w/w) and basicity 1.5 was synthesized and the comparison with AlCl3 and CPAM for flocculation effect in coking wastewater regeneration treatment was also performed. The hybrid polymer was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Raman spectroscopy. The results showed that the optimum value of CODCr removal rate for PAFC–CPAM was 52.17%, higher than that of AlCl3 and CPAM with 50% and 40.91%, respectively, meanwhile settling time and sludge volume were improved. Characterizations suggested that PAFC was grafted onto CPAM chains through coordinate bonds due to hydroxyl crosslinking.