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Modified activated carbon for the removal of copper, zinc, chromium and cyanide from wastewater

机译:改性活性炭,用于去除废水中的铜,锌,铬和氰化物

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摘要

Modified activated carbon are carbonaceous adsorbents which have tetrabutyl ammonium iodide (TBAI) and sodium diethyl dithiocarbamate (SDDC) immobilised at their surface. This study in vestigates the adsoprion of toxic ions, copper, zinc, chromium and cyanide on these adsorbents that have undegone surface modification with tetrabutyl ammonium (TBA) and SDDC in wastewater application. The modification technique enhance the removal capacity of carbon and therefore decreases cost-effective removal of Cu(II), Zn(II), Cr(VI) and CN~- from metal finishing (electroplating unit) wastewater. Two separate fixed bed modified activated carbon columns were used; TBA-carbon column for cyanide removal and SDDC-carbon column for multi-species metal ions (Cu, Zn, Cr) removal. Wastewater from electroplating unit containin 37 mg l~(-1) Cu, 27 mg l~(-1) Zn, 9.5 mg l~(-1) Cr and 40 mg l~(-1) Cn~- was treated through the modified columns. A total CN~- removal was achieved when using the TBA-carbon column with a removal capacity of 29.2 mg g~(-1) carbon. The TBA-carbon column, Cu, Zn and Cr metal ions were eliminated with a removal capacity of 38, 9.9 and 6.48 mg g~(-1), respectively. The SDDC-carbon column has an effective removal capacity for Cu (four times), Zn (four times) and Cr (two times) greater than plain carbon.
机译:改性的活性炭是碳质吸附剂,其表面固定有碘化四丁基铵(TBAI)和二乙基二硫代氨基甲酸钠(SDDC)。这项研究在有毒的离子,铜,锌,铬和氰化物的吸附上进行了研究,这些吸附剂在废水应用中经四丁基铵(TBA)和SDDC进行了地酮酮的表面改性。改性技术提高了碳的去除能力,因此降低了从金属精加工(电镀装置)废水中去除铜(II),锌(II),铬(VI)和CN〜-的成本效益。使用了两个单独的固定床改性活性炭柱。 TBA碳柱用于去除氰化物,SDDC碳柱用于去除多种金属离子(Cu,Zn,Cr)。电镀装置处理的废水中含有37 mg l〜(-1)Cu,27 mg l〜(-1)Zn,9.5 mg l〜(-1)Cr和40 mg l〜(-1)Cn〜-。修改后的列。当使用TBA碳柱具有29.2 mg g〜(-1)碳的去除能力时,可实现CN-的总去除。去除了TBA碳柱,Cu,Zn和Cr金属离子,去除能力分别为38、9.9和6.48 mg g〜(-1)。 SDDC碳柱的有效去除能力是普通碳的Cu(四倍),Zn(四倍)和Cr(两倍)。

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