Kumari Roshni, Khan Md Adnan, Mahto Mithilesh, Qaiyum Md Atif, Mohanta Jhilirani, Dey Banashree, Dey Soumen
Department of Chemistry, Central University of Jharkhand, Ratu-Lohardaga Road, Brambe, Ranchi 835205, India.
Department of Chemistry, The Graduate School College for Women, Sakchi, Jamshedpur 831001, India.
ACS Omega. 2020 Jul 28;5(31):19548-19556. doi: 10.1021/acsomega.0c02011. eCollection 2020 Aug 11.
Dewaxed honeycomb powder (HCP) was used as a promising adsorbent for removal of malachite green (MG) from aqueous solution. Raw honeycomb was strategically dewaxed by petroleum ether, and the purified product was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), pH, and proximate analysis. A high uptake capacity (123 mg/g) was found at neutral pH. Experimental data follow pseudo-second-order kinetics ( as 0.45 × 10 g/min/mg, = 0.986) and Langmuir isotherm with 0.999. Thermodynamic parameters suggested a spontaneous (Δ = -26.28 kJ/mol) and exothermic (Δ = -11.61 kJ/mol) process, which suggests increased randomness (Δ = 0.0486 kJ/mol) at the solid-liquid interface during the adsorption process. The material can be regenerated by ordinary salt solution (1 M NaCl) and efficiently reused for three cycles with a minimal loss in efficiency. Adsorption mechanism is proposed to be a combination of electrostatic interaction and π-π stacking between aromatic units of HCP and MG. Abundant availability, possibility of wax commercialization, economic sustainability, and comprehensive waste management make HCP an ideal choice for dye decolorization.
脱蜡蜂窝粉（HCP）被用作从水溶液中去除孔雀石绿（MG）的一种有前景的吸附剂。生蜂窝用石油醚进行了策略性脱蜡，纯化后的产物通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、pH值和近似分析进行了表征。在中性pH值下发现了较高的吸附容量（123mg/g）。实验数据符合准二级动力学（k为0.45×10 g/min/mg，R² = 0.986）和朗缪尔等温线（R² = 0.999）。热力学参数表明这是一个自发过程（ΔG = -26.28kJ/mol）且为放热过程（ΔH = -11.61kJ/mol），这表明在吸附过程中固液界面的随机性增加（ΔS = 0.0486kJ/mol）。该材料可用普通盐溶液（1M NaCl）再生，并能高效重复使用三个循环，效率损失极小。吸附机制被认为是HCP的芳香单元与MG之间静电相互作用和π-π堆积的结合。丰富的可用性、蜡商业化的可能性、经济可持续性以及全面的废物管理使HCP成为染料脱色的理想选择。
