Study On The Adsorption Of Modified Chinese Hickory Shell For Dyes And Cr⁶⁺ From Aqueous Solution

In this study, modified Chinese hickory shell was used as an adsorbent for the removal ofmethylene blue (MB), malachite green (MG), and Cr6+from industrial wastewater. The characteristicsof Chinese hickory shell and modified Chinese hickory shell were studied by Scanning ElectronMicroscopy (SEM), X-ray diffraction (XRD) and FTIR Spectrometer, resulting in significant increasein the adsorption process.The objective of the study is to evaluate the possibility of using the modified Chinese hickoryshell to develop a new low-cost adsorbent and to study the effect of experimental parameters such asinitial pH of the solution, initial dye concentration, and contact time on the adsorption efficiency ofMB, MG, or Cr6+from aqueous solution. The experimental results show that：Under the conditions ofmodified Chinese hickory shell dosage1.0g/L, initial MG mass concentration50mg/L, adsorptiontemperature298K, adsorption time360min and natural pH of wastewater, the removal rate of MGcan reach99.09%. The adsorption of MG on modified hickory shell accords withpseudo-second-order kinetic equation and Langmuir isotherm equation. The calculation values ofthermodynamic parameters present that the adsorption is spontaneous and exothermic in nature. Effectof adsorption on MB and Cr6+are also significantly. Overall, Modified Chinese hickory shell haspotentials for application as adsorbent for the removal of methylene blue (MB), malachite green(MG), and Cr6+from industrial wastewater.