N-doped activated carbon from used dyeing wastewater adsorbent as a metal-free catalyst for acetylene hydrochlorination

Mei, Shuang; Gu, Junjie; Ma, Tengzhou; Li, Xiaoyan; Hu, Yubing; Wei, Li; Zhang, Jinli; Han, You

doi:10.1016/j.cej.2019.04.008

Cited by 65 publications

(24 citation statements)

References 49 publications

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“…After degradation, the treated indigo wastewater was taken from the supernatant to measure the absorbance by JH756 ultraviolet-visible spectrophotometer (Shanghai Jinhua Technology Co. Ltd, Shanghai, China). Decolourization of wastewater refers to the removal of pigments contained in wastewater through physical and chemical methods (Mei et al, 2019). The decolourization rate was usually used as the evaluation index.…”

Section: Absorbance Measurementmentioning

confidence: 99%

Electrochemical oxidative degradation of indigo wastewater based on chlorine-containing system

Zhang

et al. 2020

PRT

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Purpose In this study, the oxidative degradation performance of indigo wastewater based on electrochemical systems was explored. The decolourization degrees, removal rate of chemical oxygen demand and biochemical oxygen demand of the indigo wastewater after degradation were evaluated and optimized treatment conditions being obtained. Design/methodology/approach The single factor method was first used to select the electrolyte system and electrode materials. Then the response surface analysis based on Box–Behnken Design was chosen to determine the influence of four independent variables such as FeCl3 concentration, NaCl concentration, decolourization time and voltage on the degradation efficiency. Findings On the basis of single factor experiment, the electrode material of stainless steel was selected in the double cell, and the indigo wastewater was electrolyzed with FeCl3 and NaCl electrolytes. The process conditions of electrochemical degradation of indigo wastewater were optimized by response surface analysis: the concentration of FeCl3 and NaCl was of 16 and 9 g/L, respectively, with a decolourization time of 50 min, voltage of 10 V and decolourization percentage of 98.94. The maximum removal rate of chemical oxygen demand reached 75.46 per cent. The highest ratio of B/C was 3.77, which was considered to be more biodegradable. Research limitations/implications Dyeing wastewater is bringing out more and more pollution problems to the environment. However, there are some shortcomings in traditional technologies such as adsorption and filtration. As a kind of efficient and clean water treatment technology, electrochemical oxidation has been applied to the treatments of various types of wastewater. The decolourization and degradation of indigo wastewater is taken as an example to provide reference for the treatment of wastewater in actual plants. Practical implications The developed method provided a simple and practical solution for efficiently degrading indigo wastewater. Originality/value The method for the electrochemical oxidation technology was novel and could find numerous applications in the degradation of printing and dyeing wastewater.

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Section: Absorbance Measurementmentioning

confidence: 99%

Electrochemical oxidative degradation of indigo wastewater based on chlorine-containing system

Zhang

et al. 2020

PRT

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“…[26][27][28][29] One reason for this may be the fact that adsorption forces between the existing adsorbent materials (e.g., activated carbon) and pollutants are very weak, being mainly intermolecular forces. 30,31 On the other hand, the large macromolecule skeletons of lignins (Scheme 1) hinder interactions between lignins and adsorbents due to steric hindrance effects. To solve this problem, improving the adsorption capacity of the chosen adsorbents is key.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are few reports studying adsorption for the removal of lignins in water 26–29 . One reason for this may be the fact that adsorption forces between the existing adsorbent materials (e.g., activated carbon) and pollutants are very weak, being mainly intermolecular forces 30,31 . On the other hand, the large macromolecule skeletons of lignins (Scheme 1) hinder interactions between lignins and adsorbents due to steric hindrance effects.…”

Section: Introductionmentioning

confidence: 99%

Superefficient removal of lignins from papermaking wastewater by polycationic adsorption and direct reuse of wastes: structure–activity relationships and interaction mechanisms

Bai

Yang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: As a complex phenol polymer pollutant, lignin is the most difficult to remove in papermaking wastewater. RESULTS: This work first found a strong adsorbent for highly efficient removal of lignins and realized the direct reuse of its wastes. Through systemically screening the serial molecular structures of polycationic adsorbents previously developed, a highly permeable polycationic gel (PPG) adsorbent was discovered to be the most suitable for lignin removal. The maximum adsorption capacity of PPG for the lignins was 3891.65 mg/g, that is, the masses of adsorbed lignins were 3.89 times higher than that of PPG. Interestingly, after adsorbing the lignins, PPG wastes could be directly reused, without any treatment, for purifying dyeing wastewater. The adsorption capacity of PPG wastes reused for adsorbing the anionic dyes was 245.05 times higher than that of the existing activated carbon, indicating that PPG wastes maintained excellent adsorption ability for purifying the dyeing wastewater. A series of simulation experiments and instrument analyses were carried out to detect the new adsorption effect of PPG. The high water-permeability of PPG allows for complete permeability of the lignins and easy adsorption inside PPG. After adsorption, shrinkage of the internal structure of PPG and aggregation of the adsorbed lignins on the surface of PPG enhanced the adsorption intensity of PPG toward the lignins. CONCLUSION: This indicated that PPG had a super-high adsorption ability for direct removal of lignins from water by adsorption, which marked the first successful report of reused wastes utilized for treating other waste pollutants.

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“…Various physical and chemical treatment techniques, including photo-catalysis [6], adsorption [7], coagulation [8], chemical oxidation [9], have been investigated to effectively remove MB. Among them, advanced oxidation processes (AOPs) have shown great potential in advanced treatment due to the high removal efficiency of refractory compounds [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Oxidative Degradation of Methylene Blue via PDS-Based Advanced Oxidation Process Using Natural Pyrite

Sun

Zhang

et al. 2019

IJERPH

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H2O2- and PDS-based reactions are two typical advanced oxidation processes (AOPs). In this paper, a comparative study of H2O2/PDS-based AOPs employing natural pyrite as a catalyst to degrade methylene blue (MB) was reported. The adaptive pH range in pyrite/PDS extended from 3 to 11, in contrast to the narrow effective pH range of 3–7 in pyrite/H2O2. As a result of the iron leaching, a synergistic effect of both homogeneous and heterogeneous catalysis was observed in pyrite/PDS, whereas heterogeneous catalytic oxidation dominated pyrite/H2O2. Furthermore, the batch results showed that the MB removal by pyrite/PDS was highly dependent on chemical conditions (e.g., pH, pyrite and PDS concentration, temperature). Powerful SO4•− was generated by pyrite rapidly under acidic or weakly acidic conditions, while SO4•− and PDS were assumed by OH− under alkaline condition. The lower pyrite loading (from 0.1 to 0.5 g/L) was affected the removal efficiency obviously, while the scavenging of SO4•− did not seem to be remarkable with the excessive amounts of pyrite (>0.5 g/L). Excessive amounts of PDS (>2 mmol/L) might negatively affect the pyrite/PDS system. The reaction temperature that increased from 20 to 40 °C had a positive effect on the degradation of MB. SEM and XRD showed that the passivation of catalyst did not occur due to the strong acid-production ability of pyrite/PDS, inhibiting the formation of Fe-oxide covering the pyrite surface.

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N-doped activated carbon from used dyeing wastewater adsorbent as a metal-free catalyst for acetylene hydrochlorination

Cited by 65 publications

References 49 publications

Electrochemical oxidative degradation of indigo wastewater based on chlorine-containing system

Electrochemical oxidative degradation of indigo wastewater based on chlorine-containing system

Superefficient removal of lignins from papermaking wastewater by polycationic adsorption and direct reuse of wastes: structure–activity relationships and interaction mechanisms

Oxidative Degradation of Methylene Blue via PDS-Based Advanced Oxidation Process Using Natural Pyrite

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