Abstract
This paper took the objective of preparing high-performance, low-cost biological adsorbent for printing and dyeing wastewater, and the adsorption experiment of dyestuff wastewater with high chromaticity and high biodegradability was studied. The Methylene Blue was adsorbed by the prepared Humulus Japonicus Leaves (HJ), the effects of adsorption time, pH, dosage of adsorbent, initial Methylene Blue concentration and temperature on the adsorption process were investigated, and the adsorption mechanism was described by adsorption isotherm, adsorption thermodynamics and adsorption kinetics, and the results showed that: when HJ was added 0.15g and ph was 7, the temperature was 30°C (303K), adsorption was carried out for 20min, simulated dye wastewater, adsorption efficiency of Methylene Blue of 100mg/l were excellent, adsorption rate reached up to 92%, the equilibrium adsorption rate was positively correlated with the initial concentration of CV dye. Humulus leaves adsorption CV Gibbs free energy of ΔG<0, ΔH>0, ΔS>0 showed spontaneous adsorption process, the adsorption process Methylene Blu was more suitable for the Freundlich isothermal adsorption equation, the adsorption kinetics accorded with the quasi two level kinetic model, the adsorption of the Methylene Blue dye molecule by the HJ was chemically adsorbed as the rate control step, the Methylene Blue molecule was mainly adsorbed on the surface of the Humulus leaves; the model of internal diffusion kinetics showed that there was membrane diffusion and internal diffusion of the HJ in the process of Methylene Blue adsorption. The experimental results showed that HJ as adsorbent can effectively remove Methylene Blue from dye wastewater, and the research results provide a new method and idea for biological treatment of dye wastewater.
Highlights
China is the world’s largest dye production, trade volume, and consumer country
At 303K, 0.15g Humulus leaves and methylene blue solution, within 0-120min, measure the methylene blue adsorption rate and adsorption capacity in the corresponding state at intervals, and the results are shown in the Figure1-2
The results show that the adsorption rate of humulus leaves to methylene blue is relatively fast, and the adsorption rate of methylene blue dye can reach more than
Summary
China is the world’s largest dye production, trade volume, and consumer country. Dye production accounts for more than 60% of the world’s total production. Due to technical reasons, there is a loss of more than 10% of the dyes used during the printing and dyeing process. Dyes enter the environment with wastewater [1,2]. Because most dyes have a benzene ring structure, their metabolites are toxic, and have potential carcinogenic, sudden, and allergenic effects, which are very harmful to the environment. Methylene blue [6] is a very commonly used phenothiazine-based basic dye. It is a major organic pollutant in printing and dyeing wastewater. It can be used for the dyeing of hemp, silk fabric, paper and the coloring of bamboo and wood. The adsorption method has been widely used and paid attention due to its excellent adsorption performance and good workability [7,8,9,10,11]
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