Jiangmen Wealth Water Purifying Agent Co.

Jiangmen, China

Jiangmen Wealth Water Purifying Agent Co.

Jiangmen, China
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Zheng H.-L.,Chongqing University | Zhang P.,Chongqing University | Chen Y.-Z.,Chongqing University | Tan M.-Z.,Jiangmen Wealth Water Purifying Agent Co. | And 5 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2012

Cationic degree has been investigated as an important factor in polyacrylamide materials. Diallyl dimethyl ammonium chloride and acrylamide (PDA) was grafted by free radical polymerisation of acrylamide monomer (AM) onto the cationic monomer dimethyl diallyl ammonium chloride (DMDAAC). In the present study, near infrared reflectance spectroscopy (NIRS) was used as a rapid and accurate method to determine the cationic degree in the PDA. In this experiment, the near infrared spectra of 37 PDA samples that were self-prepared in the laboratory from 900.00 to 1700.00 were collected. The characteristic peaks and the entire spectrum segment as the input layer neurons in radical basis function (RBF) were investigated for establishing the mathematical conversion NIRS calibration mode. For reduction of the NIR spectrum noise, the wavelet analysis was used as pretreatment process. The measured value was determined by using precipitation titration and a comparison between the simulated value and measured value was made. It was found that the external validation determination coefficient was more than 0.9, and the simulation value is in good agreement with the measured value. The statistics analysis showed that there was no significant difference between simulated value and measured value. Therefore, the calibration model (RBF neural network) established in this paper exhibited a remarkable feasibility for predicting the cationic degree of PDA based on the near infrared spectroscopy.

Zheng H.L.,Chongqing University | Xiang X.Y.,Chongqing University | Xiang X.Y.,Southwest University | Tan M.Z.,Jiangmen Wealth Water Purifying Agent Co. | And 3 more authors.
Asian Journal of Chemistry | Year: 2013

In this research, the synthesis and property of N,N-dithiocarboxy diethylenetriamine ethyl polymer were investigated. The polymer was synthesized through one-step reaction of diethylenetriamine, carbon disulfide with 1,2-dichloroethane, with the reaction time and required temperature being reduced significantly compared with that of traditional two-step reaction. Such factors as addition of sodium-hydroxide and its adding procedure, adding procedure of carbon disulfide, addition of diethylenetriamine, reaction temperature and reaction time were studied in details. Physical and chemical characteristics of this polymer were determined taking advantage of IR, UV and melting point test. Heavy-metal-ion absorbing property of this polymer was studied intensively. The results showed that several kinds of heavy metal ions could be significantly absorbed with the produced polymer, among which Ag +, Cu2+ and Zn2+ could be absorbed most effectively. The absorption ability of this polymer was maximized when the pH value was controlled at 5. Copyright © 2013 Asian Journal of Chemistry.

Zheng H.,Chongqing University | Feng L.,Chongqing University | Jiang Z.,Chongqing University | Yin H.,Chongqing Water Investment Group Ltd. | And 3 more authors.
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2013

Polymeric aluminum ferric sulfate (PFAS) was developed by Industrial Grade ferrous sulfate heptahydrate and industrial aluminum sulphate(16% Al2O3). PFAS was used for printing and dyeing wastewater treatment. The new synthetic Polymeric aluminum ferric sulfate (PFAS) with a unique spatial fold-like structure was discovered by scanning electron microscopy analysis(SEM). The treatment efficiency was evaluated by investigated sludge volume and the reduction of removal rate of COD and turbidity of printing and dyeing wastewater by using single factor. The results show that the removal rate of COD is achieved 83.0%, the removal rate of turbidity is achieved 95.0% and the sludge volume is 52.8 mL when the coagulant dosage is 0.3 g/L and pH is 8.5. Meanwhile, compared with the common coagulant (PFS, PAC and CPAM) in application of printing and dyeing wastewater treatment, the performance on the removal of COD and turbidity of self-make PFAS is better than those of PFS, PAC and CPAM.

Tshukudu T.,Chongqing University | Zheng H.,Chongqing University | Hua X.,Chongqing University | Yang J.,Chongqing University | And 4 more authors.
Korean Journal of Chemical Engineering | Year: 2013

Response surface method and experimental design were applied as alternatives to the conventional methods for optimization of the coagulation test. A central composite design was used to build models for predicting and optimizing the coagulation process. The model equations were derived using the least square method of the Minitab 16 software. In these equations, the removal efficiency of turbidity and COD were expressed as second-order functions of the coagulant dosage and coagulation pH. By applying RSM, the optimum condition using PFPD1 was coagulant dosage of 384 mg/L and coagulation pH of 7. 75. The optimum condition using PFPD2 was coagulant dosage of 390 mg/L and coagulation pH of 7. 48. Confirmation experiment demonstrated a good agreement between experimental values and model predicted. This demonstrates that RSM and CCD can be successfully applied for modeling and optimizing the coagulation process using PFPD1 and PFPD2. © 2012 Korean Institute of Chemical Engineers, Seoul, Korea.

Zhu J.,Chongqing University | Zheng H.,Chongqing University | Zhang Z.,Chongqing University | Jiang Z.,Chongqing University | And 4 more authors.
Huagong Xuebao/CIESC Journal | Year: 2012

The composite flocculant was prepared by polymerizing CPAM (a cationic flocculant P: acrylamide-methacryloxyethyltrimethyl ammonium chloride-acryloxyethyltrimethyl ammonium chloride) and PFAS (polymeric aluminum ferric sulfate). The morphological distribution of Fe and Al was studied by using Ferron analysis, and the morphology of the copolymer was observed using scan electron microscopy. The Box-Behnken mathematical relational model between CODCr removal rate and affecting factors was established, and the technique composing PAFS-CPAM was optimized. The optimum synthesis conditions were: react temperature 61°C, react time 74 min, and Fe/CPAM mass ratio 28, respectively. At these optimized conditions and using 50 mg·L-1 PAFS-CPAM flocculant prepared, CODCr removal and turbidity removal rates were 80.86% and 97.50%, respectively. © All Rights Reserved.

Sun Y.J.,Chongqing University | Zheng H.L.,Chongqing University | Tan M.Z.,Jiangmen Wealth Water Purifying Agent Co. | Ma J.Y.,Chongqing University | And 2 more authors.
Asian Journal of Chemistry | Year: 2014

The progress using micellar polymerization to synthesize an effective hydrophobically associating cationic polyacrylamide for treatement of wastewater was reviewed. Special emphasis was put on its preparation condition and reaction mechanism, as well as the applicability of dealing with some typical polluted water from paper making industry and oil contamination. Based on discussions above, future research perspectives on its synthesis and application were proposed.

Zheng H.,Chongqing University | Ma J.,Chongqing University | Ji F.,Chongqing University | Tang X.,Chongqing University | And 4 more authors.
Asian Journal of Chemistry | Year: 2013

This review summarizes the synthesis methods for anionic polyacrylamide. The paper lists six different kinds of anionic polyacrylamide synthesis technologies, including homopolymerization posthydrolysis process, homopolymerization cohydrolysis process, copolymerization approach, inverse emulsion polymerization, precipitation polymerization and radiation polymerization. What's more, the authors discussed the application status of anionic polyacrylamide in water treatment. Based on these reviews, future research perspectives relating to its synthesis and application were proposed.

Zheng H.L.,Chongqing University | Fan W.,Chongqing University | Xie W.Y.,Chongqing University | Ji F.Y.,Chongqing University | And 2 more authors.
Asian Journal of Chemistry | Year: 2013

In this paper, a novel kinetic spectrophotometric method for the determination of ultra trace Cu(II) was developed. This method was based on catalytic action of Cu(II) on the oxidation of indigo carmine by ammonium persulfate in Na2B4O7-HCl buffer solution (pH = 9.09) and in presence of the surfactant-TritonX-100. Effects of some factors on the reaction speed were investigated in this study. It was observed that the concentration of Cu(II) was linearly correlating to DA in the range of 2.0 × 10-10-1.6 × 10-9g/mL for Cu(II) in this method. The detecting limit of the proposed method was 1.8 × 10-11g/mL. This system was a first-order reaction for Cu(II). The apparent rate constant was 3.19 × 10-4 s-1 and the apparent activation energy was 112.5 kJ/mol in this system. Most of the foreign ions did not interfere with the determination and the interferences of Fe(III) and Al(III) could be masked by F-. The proposed method was applied to the determination of ultra trace-level copper(II) in real samples with satisfactory results.

Ma J.,Chongqing University | Zheng H.,Chongqing University | Tan M.,Jiangmen Wealth Water Purifying Agent Co. | Liu L.,Chongqing University | And 3 more authors.
Journal of Applied Polymer Science | Year: 2013

In this study, a kind of anionic polyacrylamide (P(AM-AA-AMPS)) was synthesized using acrylamide (AM), acrylic acid (AA), and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) under ultraviolet (UV) irradiation. The conditions of the polymerization reaction such as monomer mass ratio, solution pH value, EDTA concentration and urea concentration were investigated by using the single factor approach and an L16 (45) orthogonal array. The structure and morphologies of the copolymer were determined by nuclear magnetic resonance spectrometer (NMR), infrared spectrometer (IR) and scanning electron microscope (SEM). The results show P(AM-AA-AMPS) with the intrinsic viscosity of 1.5 × 103 mL g-1 was synthesized at optimal conditions: mass ratio, m(AM): m(AA): m(AMPS) of 70: 10: 10, pH value of 9.0, EDTA concentration of 0.10% and urea concentration of 0.20%. In addition, P(AM-AA-AMPS) had better flocculation efficiency than commercial PAM in sludge dewatering experiment; the minimum filter cake moisture content could be reduced to 65.1%. © 2013 Wiley Periodicals, Inc.

Zheng H.,Chongqing University | Zhu J.,Chongqing University | Jiang Z.,Chongqing University | Ji F.,Chongqing University | And 4 more authors.
Advanced Materials Research | Year: 2012

Tailings dewatering is an important part of the tailings disposal. Sludge dehydrant is a kind of important auxiliary agent in improving the tailings dehydration dehydrated efficiency in tailings enrichment dehydration. The paper reviews that the preparation and application of special flocculant of specialized flocculants for tailings water treatment. And it points out the development tendency of the specialized flocculants for tailings water treatment. Cationic polyacrylamide as one of dewatering agents is a suitable mean to solve tailings dewatering problem.

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