Removal of copper from aqueous solution by adsorption using magnesium aluminium hydrogenphosphate layered double hydroxides
Abstract
ABSTRACT
Layered double hydroxide (LDH) with Mg/Al molar ratio of 4/1 (MAN-4) was synthesized by co-precipitation and followed by hydrothermal method. The compound was allowed to undergo ion exchange with K2HPO4 for 48 hours to produce MgAlHPO4 (MAHP-4). The solid produced was characterized using X-ray diffraction (XRD) and Fourier Transform Infrared spectroscopy (FTIR). Adsorption of copper solution by MAHP-4 was carried out using batch experiment by mixing the copper solution and the sorbent MAHP-4. The effects of various parameters such as contact time, pH, adsorbent dosage and initial concentration were investigated. The optimum pH for copper removal was found to be 4 and the optimum time of copper removal was found at 4 hours. The isotherm data was analysed using model isotherm Langmuir with the correlation coefficient of 0.999 was recorded. The maximum adsorption capacity, Qo (mg/g) of 142.8 mg/g was also recorded from the Langmuir isotherm. The remaining copper solution was determined by using EDXRF (Energy Dispersive X-Ray Fluorescence spectrometry) model MiniPal 4 (PAN analytical). The results in this study indicate that MAHP-4 has potential as an effective adsorbent for removing copper from aqueous solution.
ABSTRAK
Hidroksida lapisan berganda (LDH) dengan Mg/Al nisbah molar 4/1 (MAN-4) telah disintesis oleh pemendakan bersama dan diikuti oleh kaeadah hidroterma. Bahan itu kemudian menjalani pertukaran ion dengan K2HPO4 selama 48 jam untuk menghasilkan MgAlHPO4 (MAHP-4). Pepejal yang dihasilkan telah di cirikan menggunakan x-ray pembelauan (XRD) dan Fourier Transform Infrared spektroskopi (FTIR). Penjerapan larutan kuprum oleh MAHP-4 telah dijalankan menggunakan kumpulan eksperimen dengan mencampurkan larutan kuprum dan adsorben MAHP-4. Kesan pelbagai parameter seperti masa sentuhan, pH , dos adsorben dan kepekatan awal telah disiasat. pH optimum untuk penyingkiran kuprum telah didapati 4 dan masa yang optimum penyingkiran kuprum didapati terhasil pada 4 jam. Data sesuhu telah dianalisis menggunakan model sesuhu Langmuir dengan pekali kolerasi pada 0.999. Kapasitisi maksimum penjerapan Qo (mg / g) bernilai 142,8 mg /g telah diperolehi daripada sesuhu Langmuir. Baki larutan kuprum telah ditentukan dengan menggunakan EDXRF (Pendarfluoran sinar X Serakan tenaga spektrometri) model Minipal 4 (PANanalisis). Keputusan kajian ini menunjukkan bahawa MAHP-4 mempunyai potensi sebagai adsorben yang berkesan bagi menyingkirkan kuprum daripada larutan berair.
