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首页> 外文期刊>Soil & Sediment Contamination >Evaluating the Adsorption Potential of Alachlor and Its Subsequent Removal from Soils via Activated Carbon
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Evaluating the Adsorption Potential of Alachlor and Its Subsequent Removal from Soils via Activated Carbon

机译：通过活性炭评价甲甲醛的吸附潜力及其随后从土壤中除去

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Alachlor, a globally used aniline herbicide, has great agronomic interest for controlling the development of broadleaved weeds and grasses. This research aspires to evaluate the sorption attributes of Alachlor through batch equilibrium method and its successive removal through biomass based activated carbon prepared from Sawdust (Cedrus deodara). Six soil samples were collected from selected regions of Pakistan to assess the adsorption and removal phenomena. Adsorption capacity for Alachlor varied in soils depending upon their physicochemical properties. Adsorption coefficient (K-d) values ranged from 12 to 31 mu g ml(-1) with the highest K-d value observed in soil sample with highest organic content (1.4%) and least pH (5.62). The Gibbs free energy values ranged from -17 to -20kJ mol(-1) proposing physio-sorption and exothermic interaction with soils. Values of R-2 (0.96-0.99) exhibited the best fit to linear adsorption model. Adsorption coefficient displayed a negative correlation (r = -0.97) with soil pH and positive correlation with organic matter (r = 0.87). The effect of contact time and pesticide concentration on the removal efficiency by activated carbon was investigated. The highest removal percentages observed through activated carbon were 66% and 64% at concentrations of 5 and 7.5ppm respectively. Activated carbon from sawdust (Cedrus deodara) was investigated as a suitable adsorbent for the removal of Alachor from selected soils. Biomass based activated carbon can prove to be an effective and a sustainable mean to remove pesticides from soil.
机译：全球使用的苯胺除草剂alachlor具有巨大的农艺兴趣，用于控制阔叶杂草和草的发展。该研究旨在通过批量平衡法评价甲醛的吸附属性及其通过锯末（Cedrus deodara）制备的基于生物质的活性炭的连续去除。从巴基斯坦所选地区收集六种土壤样品，以评估吸附和去除现象。根据其物理化学性质，土壤中的Alachlor的吸附能力。吸附系数（K-D）值范围为12至31μgmm（-1），在土壤样品中观察到具有最高有机含量（1.4％）和最低pH（5.62）的土壤样品中观察到的最高K-D值。 Gibbs自由能值范围为-17至-20kJ摩尔（-1），提出与土壤的物理吸附和放热相互作用。 R-2（0.96-0.99）的值表现出最合适的线性吸附模型。吸附系数显示出具有土壤pH的负相关（R = -0.97）和与有机物质的正相关（R = 0.87）。研究了接触时间和农药浓度对活性炭的去除效率的影响。通过活性炭观察到的最高除去百分比分别在5和7.5pm的浓度下为66％和64％。从锯末（Cedrus deodara）的活性炭被研究为合适的吸附剂，用于从选定的土壤中去除阿拉氏菌。基于生物质的活性炭可以证明是一种有效的和可持续的平均，以从土壤中去除农药。

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