Waste electrical and electronic equipment (WEEE) are considered as a major source for both virtuous and hazardous metals. Hazardous metals make their way to cause pollution of soil and water. The risk of contamination is very high where WEEE is being processed. In the present study activated carbon was synthesized from sawdust and modified with 1-(2-pyridylazo)-2-naphthol (PAN) through diazotization. The surface modification was confirmed through various instrumental analysis like CHNO elemental analyzer, FTIR, TGA/DSC, BET, SEM and EDX. Surface area of activated carbon calculated using BET method was 178 m²/g with average pore size of 14.5 (A^°) however, surface area gets reduce to 68 m²/g after surface modification. The synthesized adsorbent was packed in a column and used for extraction of cadmium, lead and nickel from WEEE and some soil samples. Different analytical parameters like pH, sample volume and flow rate, eluent type and flow rate, effect of coexisting ions and initial concentration were optimized. It was observed that the adsorbent has high retention factor (> 94%) for the selected metal ions at neutral pH with 12 mL/min sample flow rate. Nitric acid solution (5 mol/L) of 7 mL was found suitable for quantitative elution with flow rate of 2 mL/min. The method was efficient even with higher sample volume of 1000 mL, 1200 mL and 900 mL with enrichment factor of 143, 171 and 129 for Cd, Pb and Ni, respectively. As compared to batch adsorption, cartridge of the synthesized adsorbent can be regenerated and used multiple times with ease. Similarly, it also prevents both loss of adsorbent and collected metals ions as normally in case of filtration or centrifugation process.

废弃的电气和电子设备（WEEE）被认为是有害金属和有害金属的主要来源。有害金属正在造成土壤和水的污染。正在处理WEEE的污染风险非常高。在本研究中，活性炭由木屑合成，并通过重氮化用1-（2-吡啶基偶氮）-2-萘酚（PAN）改性。通过各种仪器分析，例如CHNO元素分析仪，FTIR，TGA / DSC，BET，SEM和EDX，可以确认表面改性。用BET法计算的活性炭表面积为178 m ² / g，平均孔径为14.5（A ^°），但是表面积却减少到68 m ²/ g表面改性后。合成的吸附剂装在一个柱子中，用于从WEEE和一些土壤样品中提取镉，铅和镍。优化了不同的分析参数，如pH，样品量和流速，洗脱液类型和流速，共存离子的影响和初始浓度。观察到，在中性pH值和12 mL / min样品流速下，吸附剂对选定的金属离子具有较高的保留因子（> 94％）。发现7 mL的硝酸溶液（5 mol / L）适合以2 mL / min的流速进行定量洗脱。即使使用1000 mL，1200 mL和900 mL较高的样品量，Cd，Pb和Ni的富集因子分别为143、171和129，该方法仍然有效。与批量吸附相比，合成吸附剂的滤芯可轻松再生并多次使用。同样，与过滤或离心过程一样，它也可以防止吸附剂和收集的金属离子流失。