Akhtar Mubeena, Iqbal Shahid, Bhanger M I, Moazzam M
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan.
J Hazard Mater. 2009 Mar 15;162(2-3):703-7. doi: 10.1016/j.jhazmat.2008.05.084. Epub 2008 May 23.
Sorption potential of rice (Oryza sativa) bran and rice husk for the removal of triazophos (TAP), an organophosphate pesticide, has been studied. The specific surface area were found to be 19+/-0.7 m(2)g(-1) and 11+/-0.8m(2)g(-1) for rice bran and rice husk, respectively. Rice bran exhibited higher removal efficiency (98+/-1.3%) than rice husk (94+/-1.2%) by employing triazophos solution concentration of 3 x 10(-5) M onto 0.2 g of each sorbent for 120 min agitation time at pH 6 and 303 K. The concentration range (3.2-32) x 10(-5) M was screened and sorption capacities of rice bran and rice husk for triazophos were computed by different sorption isotherms. The energy of sorption for rice bran and rice husk was assessed as 14+/-0.1 and 11+/-0.2 kJ mol(-1) and kinetics of the sorption is estimated to be 0.016+/-0.002 and 0.013+/-0.002 min(-1), respectively. Intraparticle diffusion rate was computed to be 4+/-0.8 and 4+/-0.9 nmol g(-1)min(-1/2). Thermodynamic constants DeltaH, DeltaS and DeltaG at varying temperatures (283-323 K) were also calculated.
研究了米糠和稻壳对有机磷农药三唑磷（TAP）的吸附潜力。发现米糠和稻壳的比表面积分别为19±0.7 m²g⁻¹和11±0.8 m²g⁻¹。在pH值为6、温度为303 K的条件下，将浓度为3×10⁻⁵ M的三唑磷溶液与0.2 g每种吸附剂混合，搅拌120分钟，结果表明米糠的去除效率（98±1.3%）高于稻壳（94±1.2%）。筛选了浓度范围为（3.2 - 32）×10⁻⁵ M的三唑磷溶液，并通过不同的吸附等温线计算了米糠和稻壳对三唑磷的吸附容量。米糠和稻壳的吸附能分别评估为14±0.1和11±0.2 kJ mol⁻¹，吸附动力学估计分别为0.016±0.002和0.013±0.002 min⁻¹。颗粒内扩散速率计算为4±0.8和4±0.9 nmol g⁻¹min⁻¹/²。还计算了不同温度（283 - 323 K）下的热力学常数ΔH、ΔS和ΔG。
