评价市售固体废弃物衍生的活性生物炭对乙酰氨基酚和亚甲基蓝染料的吸附效果及其机制。
Evaluation of the effectiveness and mechanisms of acetaminophen and methylene blue dye adsorption on activated biochar derived from municipal solid wastes.
机构信息
Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines Diliman, 1101, Quezon City, Philippines; Bio-Energy Testing and Analysis Laboratory, Biological and Agricultural Engineering Department, Texas A&M University, College Station, 77840, TX, USA.
Bio-Energy Testing and Analysis Laboratory, Biological and Agricultural Engineering Department, Texas A&M University, College Station, 77840, TX, USA.
出版信息
J Environ Manage. 2018 Mar 15;210:255-262. doi: 10.1016/j.jenvman.2018.01.010.
The adsorption potential and governing mechanisms of emerging contaminants, i.e. acetaminophen or acetyl-para-aminophenol (APAP) and methylene blue (MB) dye, on activated carbon derived from municipal solid waste were investigated in this work. Results showed that MB adsorption was significantly more effective, with a maximum removal of 99.9%, than APAP adsorption (%R = 63.7%). MB adsorption was found to be unaffected by pH change, while the adsorption capacity of APAP drastically dropped by about 89% when the pH was adjusted from pH 2 to 12. Surface reactions during APAP adsorption was dominated by both physical and chemical interactions, with the kinetic data showing good fit in both pseudo-first order (R = 0.986-0.997) and pseudo-second order (R>0.998) models. On the other hand, MB adsorption was best described by the pseudo-second order model, with R>0.981, denoting that chemisorption controlled the process. Electrostatic attractions and chemical reactions with oxygenated surface functional groups (i.e., -OH and -COOH) govern the adsorption of APAP and MB on the activated biochar. Thermodynamic study showed that APAP and MB adsorption were endothermic with positive ΔH° values of 16.5 and 74.7 kJ mol, respectively. Negative ΔG° values obtained for APAP (-3.7 to -5.1 kJ mol) and MB (-11.4 to -17.1 kJ mol) implied that the adsorption onto the activated biochar was spontaneous and feasible. Overall, the study demonstrates the effectiveness of activated biochar from municipal solid wastes as alternative adsorbent for the removal of acetaminophen and methylene blue dye from contaminated waters.
本研究考察了从城市固体废物中提取的活性炭对新兴污染物（即对乙酰氨基酚或乙酰-对氨基酚（APAP）和亚甲基蓝（MB）染料）的吸附潜力和控制机制。结果表明，MB 的吸附效果明显更为显著，最大去除率达到 99.9%，而 APAP 的去除率仅为 63.7%。MB 的吸附不受 pH 值变化的影响，而当 pH 值从 2 调整到 12 时，APAP 的吸附容量急剧下降约 89%。APAP 吸附过程中的表面反应主要由物理和化学相互作用控制，动力学数据在拟一级（R=0.986-0.997）和拟二级（R>0.998）模型中均表现出良好的拟合度。另一方面，MB 的吸附最好由拟二级模型描述，R>0.981，表明化学吸附控制了该过程。静电吸引和与含氧表面官能团（即-OH 和-COOH）的化学反应控制着 APAP 和 MB 在活化生物炭上的吸附。热力学研究表明，APAP 和 MB 的吸附均为吸热过程，其ΔH°值分别为 16.5 和 74.7 kJ/mol。对于 APAP（-3.7 至-5.1 kJ/mol）和 MB（-11.4 至-17.1 kJ/mol），所得到的负ΔG°值表明吸附到活化生物炭上是自发和可行的。总的来说，该研究表明，从城市固体废物中提取的活化生物炭作为替代吸附剂，可有效去除受污染水中的对乙酰氨基酚和亚甲基蓝染料。
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