Electronic Theses and Dissertation

Proses adsorpsi dikenal sebagai metode yang efektif untuk menghilangkan logam berat dalam air. Penelitian ini dikhususkan untuk pengembangan adsorben baru berdasarkan bahan karbon aktif untuk penghilangan ion logam Hg2+ dengan adsorben karbon-based Monolit (KM), karbon-filler mangan oksida-based monolit (KMM) dengan variasi karbon aktif 40%w; 50%w; dan 60%w dan parameter adsorpsi dengan konsentrasi awal terhadap kemampuan adsorpsi dan mekanisme kinetika penyerapan logam Hg2+. Hasil penelitian menunjukkan KMM 50% sebagai adsorben dengan efisiensi adsorpsi tertinggi yaitu 96% sedangkan pada adsorben KM efisiensi tertinggi yaitu 47%. Kedua jenis adsorben mengikuti model Freundlich non-linear yang menyatakan terjadinya adsoprsi berlangsung secara fisisorpsi multilayer. Berdasarkan data hasil penelitian didapatkan kapasitas multilayer (Kf) tertinggi pada adsorben KM 60% sebesar 0,056 L/mg dan pada adsorben KMM 60% 0,449 L/mg. Sedangkan untuk konstanta n tertinggi pada adsorben KM 60% dan KMM 50% yaitu 1,511 L/mg dan 2,078 L/mg. Kinetika adsorpsi pada konsentrasi 2 mg/L mengikuti model kinetika pseudo orde-satu non-linear dengan laju adsorpsi (k1) sebesar 0,0061; 0,0070; dan 0,0060 min-1 pada adsorben KM 40%, KM 50% dan KM 60% sedangkan pada adsorben KMM 40%, KMM 50% dan KMM 60% sebesar 0,0148; 0,0242; dan 0,0218 min-1. Selanjutnya kinetika adsorpsi pada konsentrasi 4 mg/L pada adsorben KM 40%, KM 50% dan KM 60% sebesar 0,0085; 0,0119; dan 0,0082 min-1, dan pada adsorben KMM 40%, KMM 50% dan KMM 60% sebesar 0,0180; 0,0192; dan 0,0158 min-1.

Kata kunci: karbon aktif, mangan, monolit, adsorpsi, merkuri

The adsorption process is an effective method for removing heavy metals in water. This research is devoted to the development of new adsorbents based on activated carbon for the removal of metal ions Hg2+ with carbon-based monolith (KM) adsorbents, carbon-filler manganese oxide-based monolith (KMM) with variations of activated carbon 40%w by weight; 50%w by weight; and 60%w by weight and adsorption parameters with an initial concentration on the adsorption ability and kinetics of metal ion adsorption mechanism of Hg2+. The results showed 50% KMM as the adsorbent with the highest adsorption efficiency of 96% while the highest efficiency of KM adsorbent was 47%. Both types of adsorbent follow the non-linear Freundlich model which states that the adsorption takes place by multilayer physisorption. Based on the research data, the highest multilayer capacity (Kf) was obtained at 60% KM adsorbent at 0.056 L/mg and 60% KMM adsorbent at 0.449 L/mg. Meanwhile, the highest constant n was at 60% KM and 50% KMM adsorbents, 1.511 L/mg and 2.078 L/mg. The adsorption kinetics at a concentration of 2 mg/L followed a pseudo-first-order non-linear kinetics model with an adsorption rate (k1) of 0.0061; 0.0070; and 0.0060 min-1 on the adsorbents KM 40%, KM 50% and KM 60% while the adsorbents KMM 40%, KMM 50% and 60% KMM were 0.0148; 0.0242; and 0.0218 min-1. Furthermore, the adsorption kinetics at a concentration of 4 mg/L on the adsorbents KM 40%, KM 50% and KM 60% were 0.0085; 0.0119; and 0.0082 min-1, and the KMM adsorbent was 0.0180; 0.0192; and 0.0158 min-1. Keywords: activated carbon, manganese, monolith, adsorption, mercury