Department of Chemical Engineering, School of Civil and Chemical Engineering, VIT University, Katpadi Road, Vellore 632014, India; Department of Chemical Engineering, Khalifa University of Science and Technology, The Petroleum Institute, Al Saada Street, Abu Dhabi 127788, United Arab Emirates.
Department of Chemical Engineering, Khalifa University of Science and Technology, The Petroleum Institute, Al Saada Street, Abu Dhabi 127788, United Arab Emirates.
J Biosci Bioeng. 2019 Jul;128(1):88-97. doi: 10.1016/j.jbiosc.2018.12.011. Epub 2019 Jan 22.
Phosphoric acid impregnated activated carbon from date pits (DPAC) was prepared through single step activation. Prepared DPAC was studied for its structural, elemental, chemical, surface and crystal nature. Adsorption ability of the DPAC was assessed through divalent lead ions separation studies. Effect of adsorbent dosage, contact time, pH, operating temperature and initial feed concentration on lead removal by DPAC was studied. Maximum Pb(II) adsorption capacity of 101.35 mg/g was attained for a contact time of 30 min and pH of 6 at 30°C. Increase in initial feed concentration enhanced the adsorption ability of DPAC and the rise in adsorbent dosage resulted in improved Pb(II) removal efficiency. Thermodynamic studies revealed that the lead adsorption on DPAC was exothermic and instantaneous in nature. Kinetic and equilibrium studies confirmed the suitability of pseudo-second order and Langmuir isotherm for divalent lead ions binding on DPAC. Reusability studies showed that HCl was the effective regeneration medium and the DPAC could be reused for a maximum of 4 times with slight reduction in Pb(II) removal efficiency (<10%). Results indicated the promising use of date pits biomass as a low cost and efficient starting material to prepare activated carbon for divalent lead ions removal.
磷酸浸渍的椰枣核活性炭（DPAC）通过一步法活化制备而成。研究了 DPAC 的结构、元素、化学、表面和晶体性质。通过二价铅离子分离研究评估了 DPAC 的吸附能力。研究了吸附剂用量、接触时间、pH 值、操作温度和初始进料浓度对 DPAC 去除铅的影响。在 30°C 下，接触时间为 30 分钟，pH 值为 6 时，DPAC 的最大 Pb(II)吸附容量为 101.35mg/g。初始进料浓度的增加提高了 DPAC 的吸附能力，而吸附剂用量的增加则提高了 Pb(II)去除效率。热力学研究表明，DPAC 上的铅吸附是放热和瞬时的。动力学和平衡研究证实了拟二级动力学和 Langmuir 等温线适用于 DPAC 上二价铅离子的结合。可重复使用性研究表明，HCl 是有效的再生介质，DPAC 可以重复使用最多 4 次，Pb(II)去除效率略有降低（<10%）。结果表明，椰枣生物质作为一种低成本、高效的起始材料，可用于制备用于去除二价铅离子的活性炭，具有广阔的应用前景。
