Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse

China

Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse

China

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Yan Y.,Nanjing University of Science and Technology | Yan Y.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | Chen C.,China Institute of Technology | Li Q.,Nanjing University of Science and Technology | And 5 more authors.
Desalination and Water Treatment | Year: 2015

Alkaline residue, a common solid waste from the Lianyungang Soda Plant, China, was, respectively, modified by FeCl3·6H2O (FeCAR) and MnSO4·H2O (MnCAR) for arsenate adsorption. The specific surface areas and morphologies of FeCAR and MnCAR were determined by BET and SEM methods. The adsorption properties including adsorption kinetics, isotherms, and thermodynamics were investigated in depth. The experimental data were analyzed by different kinetic and isotherm models, and the results showed that for both FeCAR and MnCAR, the pseudo-second-order kinetic model was the best-fit model for describing the adsorption process while the Langmuir isotherm model provided the best fit to the equilibrium data. The maximum adsorption capacity calculated from the Langmuir equation was 44.4 mg/g for FeCAR and 22.6 mg/g for MnCAR, which were greater than other low-cost materials. The positive value of ΔH° indicated that the arsenate adsorption on adsorbents was endothermic, which was supported by the increasing adsorbed amount of arsenate with temperature. The positive value of ΔS° reflected good affinity of arsenate toward the modified alkaline residue. Overall, alkaline residue modified by iron or manganese was a very promising alternative adsorbent for removing arsenate from groundwater. © 2015 Balaban Desalination Publications. All rights reserved.


Fang B.,Nanjing University of Science and Technology | Fang B.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | Yan Y.,Nanjing University of Science and Technology | Yan Y.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | And 11 more authors.
Water Science and Technology | Year: 2016

In this paper, spinel ferrite with high crystallinity and high saturation magnetization was successfully prepared from steel pickling sludge by adding iron source and precipitator in the hydrothermal condition. The obtained spinel ferrite was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), vibrating sample magnetometer (VSM), and Zeta potential methods and investigated as an adsorbent for removal of Pb2+ from aqueous solution. Batch experiments were performed by varying the pH values, contact time, temperature and initial metal concentration. The result of pH impact showed that the adsorption of Pb2+ was a pH dependent process, and the pH 5.8±0.2 was found to be the optimum condition. The achieved experimental data were analyzed with various kinetic and isotherm models. The kinetic studies revealed that Pb2+ adsorption onto spinel ferrite followed a pseudo-second order model, and the Langmuir isotherm model provided the perfect fit to the equilibrium experimental data. At different temperatures, the maximum Pb2+ adsorption capacities calculated from the Langmuir equation were in the range of 126.5-175.4 mg/g, which can be in competition with other adsorbents. The thermodynamic results showed that the spinel ferrite could spontaneously and endothermically adsorb Pb2+ from aqueous solution. The regeneration studies showed that spinel ferrite could be used five times (removal efficiency (%) >90%) by desorption with HNO3 reagent. © IWA Publishing 2016.


Fang B.B.,Nanjing University of Science and Technology | Fang B.B.,Jiangsu Provincial Solid and Hazardous Waste Management and Registration Center | Chu Z.,Nanjing University of Science and Technology | Chu Z.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | And 8 more authors.
Advanced Materials Research | Year: 2013

With the development of Chinese industry, stainless steel and wire rope pickling sludge pollution problems have become increasingly prominent. Pickling sludge contains a large number of residual acid and heavy metals, and it is hazardous waste which would pose potential environmental problems and threaten people's health if being deposited outdoors or landfill simply. In view of Jiangsu Province present situation of pickling sludge, the paper analyzes the physical properties and the elements content of sludge from 9 enterprises. Pickling sludge pH is basically alkaline and range 7 to 9, moisture content is basically about 50% to 60%. ICP-AES has been applied to identify the content of metals. The range of Fe content is from 13.23% to 35.56% and the range of Ca content is from 1.04% to 29.93%, which shows that pickling sludge is appropriated for resource utilization. Ni and Cr are mainly contained in pickling sludge of stainless steel, the content are 1.79%~3.2% and 2.22%~3.15%, while Pb and Zn are mainly contained in pickling sludge of wire rope, the content are 0.0034%~0.53% and 3.14%~10.18%. The Elemental Analyzer has been applied to determine the content of F, Cl, N, S and P in picking sludge. The paper aims to provide a theoretical basis for making the huge amounts of the sludge harmless and how to utilize the treated sludge. © (2013) Trans Tech Publications, Switzerland.


Yan Y.-B.,Nanjing University of Science and Technology | Yan Y.-B.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | Dong X.-L.,Nanjing University of Science and Technology | Dong X.-L.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | And 14 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

Hydroxyapatite (FGD-HA) was synthesized from waste FGD gypsum using hydrothermal method. FGD-HA was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) and investigated as adsorbent for removal Cu2+ from wastewater. The sorption kinetics, isotherms and thermodynamics of Cu2+ adsorption onto FGD-HA were investigated by batch tests. The kinetics was evaluated utilizing pseudo-first order and pseudo-second order models, and the experimental data agreed well with the pseudo-second order model due to its relatively high R2 value (0.9998). The equilibrium data were further analyzed by using the Langmuir, Freundlich and Dubinin-Radushkevich models. Equilibrium sorption of Cu2+ onto FGD-HA had best fitness with the Langmuir model. Response surface methodology (RSM) employed to optimize the adsorption process parameters. The optimum operating conditions were determined as dosage of 3.11 g/L, pH of 4.96, temperature of 22.09℃, initial concentration of 24.75 mg/g, and the removal efficiency for Cu2+ was found to be 100%. The verification experiment was also carried out at same conditions and the result was 97.4%, confirming that the model was effective.


Sun X.,Nanjing University of Science and Technology | Sun X.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | Bian H.,Nanjing University of Science and Technology | Bian H.,Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse | And 10 more authors.
Advanced Materials Research | Year: 2012

The chemically activated method has been applied to prepare activated carbon from the incinerated medical waste. The preparation process of activated carbon was investigated under various conditions set by several factors, including the type of active agent used, the ratio of active agent and carbonized product, the activation temperature, the dwell time and heating rate. The results demonstrated KOH had shown the best performance as the active agent. The optimal preparation conditions could be described as follows: ratio of KOH and carbonized product 3:1, heating rate 5 °C/min, activation temperature 800 °C with activation time 1 hour. The activated carbon prepared under the optimal preparation conditions showed good adsorption performance. The adsorption capacities for methylene blue and iodine were 24∼28 ml/0.1g and 965∼1150 mg/g, respectively. BET surface area of activated carbon obtained was as high as 985.1634∼1387.4586 m 2/g. The activated carbon prepared from medical waste exhibited excellent characteristics of sorbent.

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