Removal of Acid Orange 7 dye from aqueous solutions by adsorption onto Kenya tea pulps; granulated shape

Abstract

Background and AimWater resources pollution control is one of the main challenges of our time for researchers. Colored wastewater discharges caused by textile industry activities has added to the concern. In this study, removal of Acid Orange 7 dye (AO7) using Kenya Tea residue absorbent (granular) has been studied.MethodsThis cross-sectional study was conducted in 2016. In this work, initially, tea residue was prepared in three forms of raw, treated with concentrated phosphoric acid, and carbonated, at temperatures of 350, 450 and 500 °C in the chemistry laboratory of Gonabad University of Medical Sciences. Then, efficiency of the above absorbents in the removal of Acid Orange 7 dye in initial concentrations of dye as 50–500 mg/l from water samples in terms of pH 2–10 and 1–10 g/l of adsorbent dose within 20 to 300 minutes was investigated. In addition, their subordination from Langmuir and Freundlich absorption isotherms was also determined. Concentration changes in Acid Orange 7 dye at a wavelength of 483 nm was determined by spectrophotometry and results were reported using descriptive statistics.ResultsResults showed that efficiency of Acid Orange 7 dye removal is higher in acidic pH and higher adsorbent dosage. The highest efficiency of Acid Orange 7 dye removal was 98.41% by raw tea residue absorbent at pH 2, reaction time was 120 minutes and initial concentration of dye was 50 mg/l, which was obtained at adsorbent dosage of 10 g/l. It was determined that the mechanism of absorption acceptably follows Freundlich absorption isotherm (R2=0.97).ConclusionDue to the availability and very low price, optimal performance of Kenya tea raw residue (granular) in Acid Orange 7 dye removal, it can be used as an efficient surface absorber in an absorber from colored wastewater.

Efficient Visible-Light Photocatalysis of 2D-MXene Nanohybrids with Gd3+- and Sn4+-Codoped Bismuth Ferrite

“…This discharge of dye color is because of the breakdown of the azo bonds between the dye molecules. The dye degradation efficiency can be determined using the following equation whereas C o is the initial concentration of dye solution and C is the concentration of dye solution at any time t . ,,,− The absorbance spectra of all of the hybrid samples and pure MXene are shown in Figure a–e The absorbance spectra of pure MXene at different times indicate the concentration of Congo red dye as well as its degradation efficiency from the catalytic solution . The MXene sheets are black, indicating that the sheets absorb all types of radiation (UV, vis, and NIR).…”

Highly efficient biodegradation of reactive blue 19 under the activation of tea residue by a newly screened mixed bacterial flora DDMY2

“…This finding was different from existing research that tea residue was used as adsorbent to remove dyes. 14,15 Based on our previous work, through single factor and orthogonal experimental analysis of common substances in tea residue, epigallocatechin gallate was deciphered to be the key active component which was responsible for the enhancement effect on the decolorization performance by activating the functional bacteria. 16 …”

Quaternary‐Ammonium‐Based Gels with Varied Alkyl Chains for the Efficient Removal of Toxic Acid Orange 7

“…[21][22][23][24] The existing literature reports the sorbents that are capable of removing dyes only either at low pH, or at low or higher temperature. [25][26][27] Often the sorbent synthesis requires very high temperature. [6] Therefore, it is vital to develop sorbents which are efficient at ambient conditions and do not involve harsh synthetic route.…”

“…In this context, removal of toxic dyes by adsorption on suitable sorbent is compelling as it eliminates the possibility of formation of toxic side products . The existing literature reports the sorbents that are capable of removing dyes only either at low pH, or at low or higher temperature . Often the sorbent synthesis requires very high temperature .…”